The University of Western Australia

UWA Staff Profile

Ipsum Lorem

Stephen Powles

Professor Stephen Powles

Director
Australian Herbicide Resistance Initiative

Contact details
Address
Australian Herbicide Resistance Initiative
The University of Western Australia (M086)
35 Stirling Highway
CRAWLEY WA 6009
Australia
Phone
+61 8 6488 7833
Fax
+61 8 6488 7834
Email
stephen.powles@uwa.edu.au
Personal homepage
http://www.ahri.uwa.edu.au/
Location
Room 1004, Agriculture North West Wing, Perth campus

Professor
Agriculture and Environment, School of

Contact details
Address
School of Agriculture and Environment
The University of Western Australia (M086)
35 Stirling Highway
CRAWLEY WA 6009
Australia
Phone
+61 8 6488 7833
Email
stephen.powles@uwa.edu.au
Personal homepage
http://www.ahri.uwa.edu.au/
Location
Room 1004, NW Wing Agriculture Building, Perth campus
Qualifications
DipAppSc W.Syd., MSc Mich. State, PhD ANU, FAA, FTSE
Biography
An international authority on all aspects of herbicide resistance in plants, from a basic biochemical understanding, through to practical on-farm management. I am equally interested in the generation of new knowledge through to application in cropping systems. One of the world's most highly cited plant scientists (ISI highly cited.com)
Key research
Evolution, biochemistry, molecular genetic basis and management of herbicide resistance in plants.
Publications
1. Books:

2001Herbicide Resistance and World Grains.
Editors: Stephen B Powles & Dale L Shaner
CRC Press. 2001.

1994 Herbicide Resistance in Plants: Biology & Biochemistry.
Editors: Stephen B. Powles & Joseph A.M. Holtum.
CRC Press. 1994.

2. Major Reviews:

Walsh, M., Newman, P., Powles, S. (2013) Targetting Weed Seeds In-Crop: A new weed control paradigm for global agriculture. Weed Technology, 27, 431-436.

Norsworthy, J.K., Ward, S.M., Shaw, D.R., Llewellyn, R.S., Nichols, R.L., Webster, T.M., Bradley, K.W., Frisvold, G., Powles, S.B., Burgos, N.R., Witt, W.W., Barrett, M. (2012) Reducing the risks of herbicide resistance: Best management practices and recommendations. Weed Science, special issue, pp 31-62.

Powles, S.B., Yu, Q. (2010) Evolution in Action: Plants resistant to herbicides. Annual Review of Plant Biology, 61, 317-347.

Vila-Aiub, M.M, Neve, P., Powles, S.B. (2009) Fitness costs associated with evolved herbicide resistance alleles in plants. New Phytologist, 184, 751-767.

Duke, S.O., Powles, S.B. (2009) Glyphosate-resistant crops and weeds: Now and in the future. AgBioForum, 12, 1-12

Powles, S.B. (2008) Evolution in action: Glyphosate-resistant weeds threaten world crops. Outlooks on Pest Management, 19, 256-259.

Duke, S.O, Powles, S.B. (2008) Glyphosate: A once-in-a-century herbicide. Pest Management Science, 64, 319-325.

Powles, S.B. (2008) Evolved glyphosate-resistant weeds around the world: Lessons to be learnt. Pest Management Science, 64, 360-365.

Walsh, M.J., Powles, S.B. (2007) Management strategies for herbicide-resistant weed populations in Australian dryland crop-production systems. Weed Technology, 21, 332-338.

Powles, S.B. and C. Preston. (2006) Evolved glyphosate resistance in plants: Biochemical and genetic basis of resistance. Weed Technology, 20, 282-289.

Powles, S.B., Preston, C., Jutsum, A.R. and Bryan, I.B. (1997) Herbicide Resistance: Impact and Management. Advances in Agronomy. Vol. 58, 57-93.

Holt, J.S., Powles S.B. and Holtum, J.A.M. (1993) Mechanisms & agronomic aspects of herbicide resistance. Annual Review of Plant Biology. Vol. 44, 203-229.

Powles, S.B. (1984) Photoinhibition of photosynthesis induced by visible light. Annual Review of Plant Biology, Vol. 35, 15-44.


3. International Research Journals.

a) Evolved resistance to glyphosate.

Gaines, T.A., Wright, A.A., Molin, W.T., Lorentz, L., Riggins, C.W., Tranel, P.J., Beffa, R., Westra, P., Powles, S.B. (2013) Identification of genetic elements associated with EPSPS gene amplification. PLOS ONE, 8, 1-10.

Vila-Aiub, M.V., Gundel, P.E., Yu, Q., Powles, S.B. (2013) Glyphosate resistance in Sorghum halepense and Lolium rigidum is reduced at suboptimal growing temperatures. Pest Management Science, 69, 228-232.

Gaines, T.A., Cripps, A., Powles, S.B. (2012) Evolved resistance to glyphosate in Junglerice (Echinochloa colona) from the tropical Ord River region in Australia. Weed Technology, 26, 480-484.

Vila-Aiub, M.M., Balbi, M.C., Distefano, A.J., Fernandez, L., Esteban Hopp, Yu, Q., Powles, S.B. (2011) Glyphosate resistance in perennial Sorghum halepense (Johnsongrass), endowed by reduced glyphosate translocation and leaf uptake. Pest Management Science, 68, 430-436.

Powles, S.B. (2010) Gene amplification delivers glyphosate-resistant weed evolution. Proceedings US National Academy of Sciences, 107, 955-956.

Owen, M.J., Powles, S.B. (2010) Glyphosate-resistant rigid ryegrass (Lolium rigidum) populations in the Western Australian grain belt. Weed Technology, 24, 44-49.

Busi, R., Powles, S.B. 2009. Evolution of glyphosate resistance in a Lolium rigidum population by glyphosate selection at sublethal doses. Heredity, 103, 318-325.

Yu, Q., Abdallah, I., Han, H., Owen, M. Powles, S. (2009) Distinct non-target site mechanisms endowing resistance to glyphosate, ACCase and ALS-inhibiting herbicides in multiple herbicide resistant Lolium rigidum. Planta, 230, 713-723.

Owen, M.J., Owen, R.K., Powles, S.B. 2009. A survey in the southern grain belt of Western Australia did not find Conyza spp resistant to glyphosate. Weed Technology, 23, 492-494.

Vila-Aiub, M.M., Balbi, M.C., Gundel, P.E., Ghersa, C.M., Powles, S.B. (2007) Evolution of glyphosate-resistant Johnson grass (Sorghum halepense) in glyphosate-resistant soybeans. Weed Science, 55, 566-571.

Yu, Q., Cairns, A., Powles, S.B. (2007) Glyphosate, paraquat and ACCase multiple herbicide resistance in a Lolium rigidum biotype. Planta, 225, 499-513.

Pedersen, B. P., Neve, P., Andreasen, C., Powles, S.B. (2007) Ecological fitness of a glyphosate resistant Lolium rigidum population: Growth and seed production along a competition gradient. Basic & Applied Ecology, 8, 258-268.

Neve, P., Sadler, J., Powles, S.B. (2004). Multiple herbicide resistance in a glyphosate- resistant rigid ryegrass (Lolium rigidum) population. Weed Science 52: 920-928.

Neve, P., Diggle, A.J., Smith, F.P., Powles, S.B. (2003) Simulating evolution of glyphosate resistance in Lolium rigidum. I. Population biology of a rare resistance trait. Weed Research 43: 404-417.

Neve, P, Diggle, A.J., Smith, F.P., Powles, S.B. (2003) Simulating evolution of glyphosate resistance in Lolium rigidum. II. Past, present and future glyphosate use in Australian cropping. Weed Research 43: 418-427.

Powles, S.B. (2003) My View: Will glyphosate continue to aid world food production? Weed Science, 51: 471.

Lorraine-Colwill, D.F., Powles, S.B., Hawkes, T.R., Hollinshead, P.H., Warner, S.A.J., Preston, C. (2003) Investigations into the mechanism of glyphosate resistance in Lolium rigidum. Pesticide Biochemistry and Physiology, 74, 62-72.

Lorraine-Colwill, D.F., Powles, S.B., Hawkes T.T., Preston, C. (2001) Inheritance of evolved glyphosate resistance in Lolium rigidum. Theoretical & Applied Genetics. 102, 545-550.

Lorraine-Colwill, DF., Hawkes, TR., Williams, PH., Warner, SJ., Sutton, PB., Powles, SB., Preston, C. (1999) Resistance to glyphosate in Lolium rigidum. Pesticide Science, 55, 486-503.

Powles, S.B., Lorraine-Colwill, D.F., Dellow, J.J., Preston, C. (1998) Evolved Resistance to glyphosate in rigid ryegrass (Lolium rigidum) in Australia. Weed Science. 46, 604-607.

B) Resistance endowed by enhanced herbicide metabolism rate

Busi, R., Neve, P., Powles, S.B. (2013) Evolved polygenic herbicide resistance in Lolium rigidum by low-dose herbicide selection within standing genetic variation. Evolutionary Applications, 6, 231-242.

Han, H., Yu, Q., Cawthray, G.R., Powles, S.B. (2013) Enhanced herbicide metabolism induced by 2,4-D in herbicide susceptible Lolium rigidum provides protection against diclofop-methyl. Pest Management Science, 69, 996-1000.

Yu, Q., Han, H., Cawthray, G.R., Wang, S.F., Powles, S.B. (2013) Enhanced rates of herbicide metabolism in low herbicide-dose selected resistant Lolium rigidum. Plant Cell and Environment, 36, 818-827.

Ahmad-Hamdani, M.S., Yu, Q., Han, H., Cawthray, G.R., Wang, S.F., Powles, S.B. (2013) Herbicide resistance endowed by enhanced rates of herbicide metabolism in wild oat (Avena spp). Weed Science, 61, 55-62.

Owen, M.J., Goggin, D.E., Powles, S.B. (2012) Non-target-site-based resistance to ALS-inhibiting herbicides in six Bromus rigidus populations from Western Australian cropping fields. Pest Management Science, 68, 1077-1082.

Pan, G., Si, P., Yu, Q., Tu, J., Powles, S.B. (2012) Non-target site mechanism of metribuzin tolerance in induced tolerant mutants of narrow-leafed lupin (Lupinus angustifolius). Crop & Pasture Science, 63, 452-458.

Owen, M.J., Goggin, D.E., Powles, S.B. (2012) Non-target-site-based resistance to ALS-inhibiting herbicides in six Bromus rigidus populations from Western Australian cropping fields. Pest Management Science, 68, 1077-1082.

Busi, R., Powles, S.B. (2011) Genetic control of a cytochrome P450 metabolism-based herbicide resistance mechanism in Lolium rigidum. Heredity, 106, 817-824.

Vila-Aiub, M.M., Neve, P., Powles, S.B. (2009) Evidence for an ecological cost of enhanced herbicide metabolism in Lolium rigidum. Journal of Ecology, 97, 772-780.

Vila-Aiub, M.M., Neve, P., Powles, S.B. (2005) Resistance cost of a cytochrome P450 herbicide metabolism resistance mechanism but not an ACCase target site mutation in a multiple resistant Lolium rigidum population. New Phytologist, 167, 787-796.

Vila-Aiub, M.M., Neve, P., Steadman, K.J., Powles, S.B. (2005) Ecological fitness of a multiple herbicide resistant Lolium rigidum population: Dynamics of seed germination and seedling emergence of target-site versus metabolism-based resistant and susceptible phenotypes. Journal of Applied Ecology, 42, 288-298.

Yu, Q., Friesen, S., Zhang, X., Powles, S.B. (2004) Tolerance to acetolactate synthase and acetyl-coenzyme A carboxylase inhibiting herbicides in Vulpia bromoides is conferred by two co-existing resistance mechanisms. Pesticide Biochemistry and Physiology, 78, 21-30.

Tardif, F.J., Powles, S.B. (1999) Effect of malathion on resistance to soil-applied herbicides in a population of rigid ryegrass (Lolium rigidum). Weed Science, 47, 258-261

Preston, C, Powles, S.B. (1998) Amitrole inhibits diclofop metabolism and synergises diclofop-methyl in a diclofop-methyl-resistant biotype of Lolium rigidum. Pest. Biochem. Physiol. 62, 179-189.

Preston, C., Powles, S.B. (1997) Light-dependent enhanced metabolism of chlorotoluron in a substituted urea herbicide-resistant biotype of Lolium rigidum Gaud.. Planta 201: 202-208.
Hall, L.M., Moss, S.R., Powles, S. B. (1997) Mechanisms of resistance to aryloxyphenoxypropionate herbicides in two resistant biotypes of Alopecurus myosuroides (blackgrass): Herbicide metabolism as a cross-resistance mechanism. Pest. Biochem. Physiol. 57: 87-98.

Maneechote, C., Preston, C. Powles, S.B. (1997). A diclofop-methyl-resistant Avena sterilis biotype with a herbicide-resistance acetyl-coenzyme A carboxylase and enhanced metabolism of diclofop-methyl. Pestic. Sci. 49-105-114.
Helvig, C., Tardif, F.J., Seyer, A., Powles, S.B., Mioskowski, C., Durst, F., Salaun, J.P. (1996). Selective inhibition of a cytochrome P450 enzyme in wheat that oxidises both the natural substrate lauric acid and the synthetic herbicide diclofop. Pest. Biochem. Physiol. 54:

Preston, C., Tardif, F.J., Christopher, J.T., Powles, S.B. (1996) Multiple resistance to dissimilar herbicide chemistries in a biotype of Lolium rigidum due to enhanced activity of several herbicide degrading enzymes. Pest. Biochem. Physiol. 54: 123-134.

Hall, L.M., Moss, S.R., Powles, S.B. (1995) Mechanism of resistance to chlorotoluron in two biotypes of the grass weed Alopecurus myosuroides. Pest. Biochem. Physiol. 53: 180-182.

Christopher, J.T., Preston, C., Powles, S.B. (1994) Malathion antagonizes metabolism-based chlorsulfuron resistance in Lolium rigidum. Pest. Biochem. & Physiol. 49: 172-182.

Burnet, M.W.M., Loveys, B.R., Holtum, J.A.M., Powles, S.B. (1993) A mechanism of chlortoluron resistance in Lolium rigidum. Planta. 190: 182-189.

Burnet, M.W.M., Loveys, B.R., Holtum, J.A.M., Powles, S.B. (1993) Increased detoxification is a mechanism of simazine resistance in Lolium rigidum. Pest Biochem & Physiol.46: 207-218.

Christopher, J.T., Powles, S.B., Holtum, J.A.M. (1992) Resistance to acetolactate synthase inhibiting herbicides in annual ryegrass (Lolium rigidum) involves at least two mechanisms. Plant Physiology. 100, 1909-1913.

Christopher, J.T., Powles, S.B., Holtum, J.A.M., Liljegren, D.R. (1991) Cross-resistance to herbicides in annual ryegrass (Lolium rigidum). II. Chlorsulfuron resistance involves a wheat-like detoxification system. Plant Physiology, 95, 1036-45.

Burnet, M.W., Hildebrand, O.B., Holtum, J.A.M., Powles, S.B. (1991) Amitrole, triazine, substituted urea and metribuzin resistance in a biotype of rigid ryegrass (Lolium rigidum). Weed Science, 39: 317-323.

C)Herbicide dose and resistance evolution.

Busi, R., Powles, S.B. (2013) Cross-resistance to prosulfocarb and triallate in pyroxasulfone-resistant Lolium rigidum. Pest Management Science, 69, 1379-1384.

Busi, R., Gaines, T.A., Walsh, M.J., Powles, S.B. (2012) Understanding the potential for resistance evolution to the new herbicide pyroxasulfone: field selection at high doses versus recurrent selection at low doses. Weed Research, 52, 489-499.

Manalil, S., Renton, M., Diggle A., Busi, R., Powles, S.B. (2012) Simulation modelling identifies polygenic basis of herbicide resistance in a weed population and predicts rapid evolution of herbicide resistance at low herbicide rates. Crop Protection, 40, 114-120.
Manalil, S., Busi, R., Renton, M., Powles, S.B. (2012) An herbicide-susceptible rigid ryegrass (Lolium rigidum) population made even more susceptible. Weed Science, 60, 101-105.

Manalil, S., Busi, R., Renton, M., Powles, S.B. (2011) Rapid evolution of herbicide resistance by low herbicide dosages. Weed Science, 59, 210-217.

Reboud, X., Majerus, N., Gasquez, J., Powles, S.B. (2007) Chlamydomonas reinhardtii as a model system for pro-active herbicide resistance evolution research. Biological Journal of the Linnean Society. 91, 257-266.

Neve, P., Powles, S.B. (2005) High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance. Heredity, 95, 485-492.

Neve, P., Powles, S.B. (2005) Recurrent selection with reduced herbicide rates results in the rapid evolution of herbicide resistance in Lolium rigidum. Theoretical & Applied Genetics. 110, 1154-1166.

D) Gene flow and herbicide resistance

Busi, R. Michel, S., Powles, S.B., Delye, C. (2011) Gene flow increases the initial frequency of herbicide resistance alleles in unselected Lolium rigidum populations. Agriculture, Ecosystems & Environment, 142, 403-409.

Busi, R., Yu, Q., Barrett-Lennard, R., Powles, S.B. (2008) Long distance pollen-mediated flow of herbicide resistance genes in Lolium rigidum. Theoretical & Applied Genetics, 117, 1281-1290.

Rieger, M.A., Lamond, M., Preston, C., Powles, S.B., Roush, R.T. (2002) Pollen-mediated movement of herbicide resistance between commercial canola fields. Science. 296 (5577), 2386-2388.

Rieger, M.A., Potter, T.D., Preston, C., Powles, S.B. (2001) Hybridisation between Brassica napus L. and Raphanus raphanistrum L. under agronomic field conditions. Theoretical & Applied Genetics. 103, 555-560.

Rieger, M.A., Preston, C., Powles, S.B. (1999) Risks of gene flow from transgenic herbicide-resistant canola (Brassica napus) to weedy relatives in southern Australian cropping systems.
Aust. J. Agric. Res. 50, 115-128.

E)Geographic grain-belt surveys of herbicide resistance.

Michael, P.J., Owen, M.J., Powles, S.B. (2010) Herbicide-resistant weed seeds contaminate grain sown in the Western Australian grainbelt. Weed Science, 58, 466-472.

Owen, M.J., Powles, S.B. (2009) Distribution and frequency of herbicide-resistant wild oat (Avena spp.) across the Western Australian grain belt. Crop & Pasture Science, 60, 25-31.

Llewellyn, R.S., D’Emden, F.H., Owen, M.J., Powles, S.B. (2009) Herbicide resistance in rigid ryegrass (Lolium rigidum) has not led to higher weed densities in Western Australian cropping fields. Weed Science, 57, 61-65.

Walsh, M.J., Owen, M.J., Powles, S.B. (2007) Frequency and distribution of herbicide resistance in Raphanus raphanistrum populations randomly collected across the Western Australian wheatbelt. Weed Research, 47, 542-550.

Owen, M.J., Walsh, M.J, Llewellyn and Powles, S.B. (2007) Widespread occurrence of multiple herbicide resistance in Western Australian annual ryegrass (Lolium rigidum) populations. Australian J. Agricultural Research, 58, 711-718.

Llewellyn, R., Powles, S.B. (2001) High levels of herbicide resistance in rigid ryegrass (Lolium rigidum) in the wheatbelt of Western Australia. Weed Technology, 15, 242-248.

Walsh, M.J., Duane, R.D. and Powles, S.B. (2001) High frequency of chlorsulfuron resistant wild radish (Raphanus raphanistrum L.) populations across the Western Australian wheatbelt. Weed Technology. 15, 199-203.

F) Evolved resistance to acetyl coenzyme A carboxylase herbicides.

Yu, Q., Ahmad-Hamdani, M.S., Han, H., Christoffers, M.J., Powles, S.B. (2013) Herbicide resistance-endowing ACCase gene mutations in hexaploid wild oat (Avena fatua): Insights into resistance evolution in a hexaploid species. Heredity, 110, 220-231.

Ahmad-Hamdani, M.S., Owen, M.J., Yu, Q., Powles, S.B. (2012) ACC-ase inhibiting herbicide-resistant Avena spp. populations from the Western Australian grain belt. Weed Technology, 261, 130-136.

Yu, Q., Collavo, A., Zheng, M.Q., Owen, M.J., Sattin, M., Powles, S.B. (2007) Diversity of acetyl-coenzyme A carboxylase mutations in resistant Lolium populations: Evaluation using clethodim. Plant Physiology, 145, 547-558.

Zhang, X., Powles, S.B. (2006b) Six amino acid substitutions in the carboxyl-transferase domain of the plastidic acetyl.CoA carboxylase gene are linked with resistance to herbicides in a Lolium rigidum population. New Phytologist, 172, 636-645.

Zhang, X, Powles, S.B. (2006a) The molecular basis for resistance to acetyl co-enzyme A carboxylase (ACCase) inhibiting herbicides in two target-based resistant biotypes of annual ryegrass (Lolium rigidum). Planta, 223, 550-557.

Delye, C., Zhang, X., Severine, M., Annick, M., Powles, S.B. (2005) Molecular bases for sensitivity to acetyl-coenzyme A carboxylase inhibitors in black-grass. Plant Physiology: 137, 794-806.

Maneechote, C., Samanwong, S., Zhang, X., Powles, S.B. (2005) Resistance to ACCase inhibiting herbicides in sprangletop (Leptochloa chinensis L.) Weed Science, 53, 290-295.

Yu, Q., Friesen, S., Zhang, X., Powles, S.B. (2004) Tolerance to acetolactate synthase and acetyl-coenzyme A carboxylase inhibiting herbicides in Vulpia bromoides is conferred by two co-existing resistance mechanisms. Pesticide Biochemistry and Physiology, 78, 21-30.

Delye, C., Zhang, X., Chalopin, C., Michel, S., Powles, S.B. (2003) An isoleucine residue within the carboxyl-transferase domain of multidomain acetyl-Coenzyme A carboxylase is a major determinant of sensitivity to aryloxyphenoxypropionate inhibitors but not to cyclohexanedione inhibitors. Plant Physiology. 132, 1716-1723

Matthews, N., Powles, S. B., Preston, C. (2000) Mechanisms of resistance to acetyl-coenzyme A carboxylase-inhibiting herbicides in a Hordeum leporinum population. Pest Management Science. 56:441-447.


Tardif, F.J., Preston, C., Holtum, J.A.M., Powles, S.B. (1996) Resistance to acetyl-coenzyme A carboxylase inhibiting herbicides endowed by a single major gene encoding a resistant target site in a biotype of Lolium rigidum. Aust. J. Plant Physiol. 23: 15-23.

Maneechote, C. Holtum, J.A.M., Powles, S.B. (1994) Resistant acetyl-CoA carboxylase is a mechanism of herbicide resistance in a biotype of Avena sterilis ssp. ludoviciana. Plant & Cell Physiology, 35: 539-547.

Holtum, J.A.M., Hausler, R., Devine, M.D., Powles, S.B. (1994) Recovery of transmembrane potential in plants resistant to aryloxyphenoxypropanoate herbicides. A phenomenon awaiting explanation. Weed Science. 42: 293-301.

Tardif, F.J., Powles, S. B. (1994) Herbicide multiple-resistance in a Lolium rigidum biotype is endowed by multiple mechanisms: Isolation of a subset with resistant acetyl-CoA carboxylase. Physiol. Plantarum. 91: 488-494.

Tardif, F. J., Holtum, J.A.M., Powles, S.B. (1993) Occurrence of a herbicide resistant acetyl-co-enzyme A carboxylase mutant in annual ryegrass (Lolium rigidum) selected by sethoxydim. Planta. 190: 176-181.

Richter, J., Powles, S.B. (1993) Pollen expression of herbicide target site resistance genes in annual ryegrass (Lolium rigidum). Plant Physiology. 102: 1037-1041.

Barr, A.R., Mansooji, A.M., Holtum, J.A.M., Powles, S.B. (1992) The inheritance of herbicide resistance in Avena sterilis ssp. ludoviciana, biotype SAS1. Proc. 1st Int. Weed Control Congress. 70-72.

Mansooji, A.M., Holtum, J.A.M., Boutsalis, P., Matthews, J.M., Powles, S.B. (1992) Resistance to aryloxyphenoxypropionate herbicides in two wild oat species (Avena fatua and Avena sterilis ssp. ludoviciana). Weed Science. 40: 599-605.

Hausler, R.E., Holtum, J.A.M., Powles, S.B. (1991) Cross-resistance to herbicides in annual ryegrass (Lolium rigidum). IV. Correlation between membrane effects and resistance to graminicides. Plant Physiology. 97, 1035-43.

Holtum, J.A.M., Matthews, J.M., Liljegren, D.R., Powles, S.B. (1991) Cross-resistance to herbicides in annual ryegrass (Lolium rigidum). III. On the mechanism of resistance to diclofop-methyl. Plant Physiology. 97, 1026-34.

Matthews, J.M., Holtum, J.A.M., Liljegren, D.R., Furness, B., Powles, S.B. (1990) Cross-resistance to herbicides in annual ryegrass (Lolium rigidum). 1. Properties of the herbicide target enzymes acetyl-CoA carboxylase (ACC) and acetolactate synthase (ALS). Plant Physiology. 94. 1180-1186.

G) Evolved resistance to acetolactate synthase (ALS/AHAS) herbicides.

Li, M., Yu, Q., Han, H., Vila-Aiub, M., Powles, S.B. (2013) ALS herbicide resistance mutations in Raphanus raphanistrum: Evaluation of pleiotropic effects on vegetative growth and ALS activity. Pest Management Science, 69, 689-695.
Han, H., Yu, Q., Purba, E., Li, M., Walsh, M., Friesen, S., Powles, S.B. (2012) A novel amino acid substitution Ala-122-Tyr in ALS confers high-level resistance and broad resistance across ALS-inhibiting herbicides. Pest Management Science, 68, 1164-1170.

Owen, M.J., Goggin, D.E., Powles, S.B. (2012) Identification of resistance to either paraquat or ALS-inhibiting herbicides in two Western Australian Hordeum leporinum biotypes. Pest Management Science, 68, 757-763.

Yu, Q., Li, M., Purba, E., Walsh, M.J., Powles, S.B. (2012) Resistance evaluation for herbicide resistance-endowing acetolactate synthase (ALS) gene mutations using Raphanus raphanistrum populations homozygous for specific ALS mutations. Weed Research, 52, 178-186.

Yu, Q., Han, H., Vila-Aiub, M.M., Powles, S.B. (2010) AHAS herbicide resistance endowing mutations: effect on AHAS functionality and plant growth. Journal of Experimental Botany, 98, 3925-3934.

Yu, Q., Han, H., Powles, S.B. (2008) Mutations of the ALS gene endowing resistance to ALS-inhibiting herbicides in Lolium rigidum populations. Pest Management Science, 64, 1229-1236.

Yu, Q., Nelson, J., Jackson, M., Powles S.B. (2007) Molecular characterisation of resistance to ALS-inhibiting herbicides in Hordeum leporinum biotypes. Pest Management Science, 63, 918-927.

Yu, Q,. Zhang, X Q., Hashem, A., Walsh, M.J., Powles, S.B. (2003) ALS gene proline (197) mutations confer ALS herbicide resistance in eight separated wild radish (Raphanus raphanistrum) populations. Weed Science. 51, 831-838.

Preston, C., Powles, S.B. (2002) Evolution of herbicide resistance in weeds: Initial frequency of target site-based resistance to acetolactate synthase-inhibiting herbicides in Lolium rigidum. Heredity, 88, 8-13.

Boutsalis, P., Karotam, J., Powles, S.B. (1999) Molecular basis of resistance to acetolactate synthase-inhibiting herbicides in Sisymbrium orientale and Brassica tournefortii. Pesticide Science. 55, 507-516.

Boutsalis, P., Powles, S.B. (1998) Seedbank characteristics of ALS herbicide-resistant and susceptible Sisymbrium orientale. Weed Research. 38. 389-393.

Boutsalis, P., Powles, S.B. (1995) Inheritance and mechanism of resistance to herbicides inhibiting acetolactate synthase in Sonchus oleraceus L. Theoretical & Applied Genetics, 91: 242-247.

Boutsalis, P., Powles, S.B. (1995) Resistance of dicot weeds to acetolactate synthase (ALS) inhibiting herbicides in Australia. Weed Research. 39. 149-155.

Burnet, M. W.M., Christopher, J.T., Holtum, J. A. M., Powles, S. B. (1994) Identification of two mechanisms of resistance to sulfonylurea herbicides within one population of rigid ryegrass (Lolium rigidum) using a selective germination medium. Weed Science. 42: 468-473.

H) Multiple herbicide resistant individuals/populations.

Walsh, M.J., Powles, S.B., Beard, B., Parkin, B.T., Porter, S. (2004) Multiple herbicide resistance across four modes of action in wild radish (Raphanus raphanistrum L.) Weed Science. 52: 8-13.

Burnet, M. W.M., Holtum, J. A. M., Powles, S. B. (1994) Resistance to nine herbicide classes in a population of rigid ryegrass (Lolium rigidum). Weed Science. 42: 369-377.

McAlister, F.M., Powles, S.B., Holtum, J.A.M. (1995) Dinitroaniline herbicide resistance in rigid ryegrass (Lolium rigidum). Weed Science. 43: 55-62.

Burnet, M.W.M., Barr, A., Powles, S. B. (1994) Chloroacetamide resistance in rigid ryegrass (Lolium rigidum). Weed Science. 42: 153-157.

I) Evolved resistance to paraquat.

Owen, M.J., Goggin, D.E., Powles, S.B. (2012) Identification of resistance to either paraquat or ALS-inhibiting herbicides in two Western Australian Hordeum leporinum biotypes. Pest Management Science, 68, 757-763.

Busi, R., Powles, S.B. (2011) Reduced sensitivity to paraquat evolves under selection with low glyphosate doses in Lolium rigidum. Agronomy for Sustainable Development, 31, 525-531.

Yu, Q., Huang, S., Powles, S.B. (2010) Direct measurement of paraquat in leaf protoplasts indicates vacuolar paraquat sequestration as a resistance mechanism in Lolium rigidum. Pesticide Biochemistry and Physiology, 98, 104-109.

Yu, Q., Han, H., Nguyen L., Forster, J.W., Powles, S.B. (2009) Paraquat resistance in a Lolium rigidum population is governed by one major nuclear gene. Theoretical & Applied Genetics, 118, 1601-1608.

Preston, C., Soar, C.J., Hidayat, I., Greenfield, K. M., Powles, S.B. (2005) Differential translocation of paraquat in paraquat-resistant populations of Hordeum leporinum. Weed Research, 45, 289-295.

Soar, C.J., Karotam, J., Preston, C., Powles, S.B. (2004) Polyamines can inhibit paraquat toxicity and translocation in the broadleaf weed Arctotheca calendula. Pesticide Biochemistry and Physiology, 80: 94-105.

Yu, Q., Cairns, A., Powles, S.B. (2004) Paraquat resistance in a population of Lolium rigidum. Functional Plant Biology. 31: 247-254.

Soar, C.J., Karotam, J., Preston, C., Powles, S.B. (2003) Reduced paraquat translocation in paraquat resistant Arctotheca calendula (L.) Levyns is a consequence of the primary resistance mechanism not the cause. Pesticide Biochemistry & Physiology, 76, 91-98.

Alizadeh, H.M, Preston, C., Powles, S.B. (1998) Paraquat resistant biotypes of Hordeum glaucum from zero tillage wheat. Weed Research. 38, 139-142.

Purba, E., Preston, C., Powles, S.B. (1996) Growth and competitiveness of paraquat-resistant and susceptible biotypes of Hordeum leporinum Link. Weed Research. 36: 311-317.

Purba, E., Preston, C., Powles, S. B. (1995) The mechanism of resistance to paraquat is strongly temperature dependent in resistant Hordeum leporinum and Hordeum glaucum. Planta. 196: 464-468.

Preston. C., Balachandran, S., Powles, S. B. (1994) Investigations of mechanisms of resistance to bipyridyl herbicides in Arctotheca calendula (L) Levyns. Plant Cell & Env. 17: 1113-1123.

Purba, E., Preston, C., Powles, S.B. (1993) Paraquat resistance in a biotype of Vulpia bromoides (L) S.F. Gray. Weed Research. 33, 409-413.

Purba, E., Preston, C., Powles, S.B. (1993) Inheritance of bipyridyl herbicide resistance in Arctotheca calendula and Hordeum leporinum. Theoretical & Applied Genetics.87, 598-602

Preston, C., Holtum, J.A.M., Powles, S.B. (1992) On the mechanism of resistance to paraquat in Hordeum glaucum and H. leporinum. Delayed inhibition of photosynthetic O2 evolution after paraquat application. Plant Physiol. 100, 630-636.

Powles, S.B., Tucker, E.S., Morgan, T.W. (1992) Eradication of paraquat-resistant Hordeum glaucum Steud. by prevention of seed production for 3 years. Weed Research. 32: 207-211.

Preston, C., Holtum, J.A.M. Powles, S.B. (1991) Paraquat resistant plants are not more resistant to photoinhibition. Plant Physiology. 96: 314-318.

Tucker, E.S., Powles, S.B. (1991) A biotype of hare barley (Hordeum leporinum) resistant to paraquat and diquat. Weed Science. 39: 159-162.

Islam, A.K.M.R., Powles, S.B. (1991) Attempts to transfer paraquat resistance from barley grass (Hordeum glaucum Steud) to barley and wheat. Weed Research. 31: 395-399.

Powles, S.B., Tucker, E.S., Morgan, T.W. (1989). A capeweed (Arctotheca calendula) biotype in Australia resistant to bipyridyl herbicides. Weed Science 37: 60-62.

Islam, A.K.M.R., Powles, S.B. (1988). Inheritance of resistance to paraquat in barley grass (Hordeum glaucum Steud). Weed Research 28: 393-397.

Tucker, E.S., Powles, S.B. (1988). The occurrence and distribution in south-eastern Australia of barley grass (Hordeum glaucum) resistant to paraquat. Plant Protection Quarterly. 3: 19-21.

Powles, S.B., Cornic, G. (1987) Mechanism of paraquat resistance in Hordeum glaucum. I. Studies with isolated organelles and enzymes. Aust. J. Plant Physiol. 14, 81-89.

Bishop, T.W., Powles, S.B., Cornic, G. (1987). Mechanism of paraquat resistance in Hordeum glaucum II. Paraquat uptake and translocation. Aust. J. Plant Physiol. 14: 539-547.

Powles, S.B. (1986) The appearance of a biotype of the weed, Hordeum glaucum, resistant to the herbicide paraquat. Weed Research 26, 167-172.

J) Target site resistance to PSII herbicides

Friesen, L.J., Powles, S.B. (2007) Physiological and molecular characterization of atrazine resistance in a wild radish population (Raphanus raphanistrum). Weed Technology, 21, 910-914.

Hashem, A., Dhammu, H.S., Powles, S.B., Bowran, D.G., Piper, T.J., Cheam, A.H. (2001) Triazine resistance in a biotype of wild radish (Raphanus raphanistrum) in Australia. Weed Technology. 15, 636-641

Management of herbicide resistance in crops.

K) Herbicide use/sustainability and alternative weed control technologies.

Walsh, M., Newman, P., Powles, S. (2013) Targetting Weed Seeds In-Crop: A new weed control paradigm for global agriculture. Weed Technology, 27, 431-436.

Walsh, M.J., Harrington, R.B., Powles, S.B. (2012) Harrington Seed Destructor: A new nonchemical weed control tool for global grain crops. Crop Science, 52, 1343-1347.

Walsh, MJ, Stratford, K., Stone, K., Powles, S.B. (2012) Synergistic effects of atrazine and mesotrione on susceptible and resistant wild radish (Raphanus raphanistrum) populations and the potential for overcoming resistance to triazine herbicides. Weed Technology, 26, 341-347.

Walsh, M.J., Fowler, T.M., Crowe, B., Ambe, T., Powles, S.B. (2011) The potential for pyroxasulfone to selectively control resistant and susceptible rigid ryegrass (Lolium rigidum) biotypes in Australian grain crop production systems. Weed Technology, 25, 30-37.
Walsh, M.J., Powles, S.B. (2009) Impact of crop-topping and swathing on the viable seed production of wild radish (Raphanus raphanistrum). Crop & Pasture Science, 60, 667-674.

Walsh, M.J., Maguire, N., Powles, S.B. (2009) Combined effect of wheat competition and 2,4-D amine on phenoxy herbicide resistant Raphanus raphanistrum populations. Weed Research, 49, 316-325.

Walsh, M.J., Wilson, B.L., Powles, S.B. (2007) Residual activity of three herbicides following exposure to summer-autumn conditions on the surface of three Western Australian wheatbelt soils. Plant Protection Quarterly, 22, 113-120.

Llewellyn, R.S., Lindner, R.K., Pannell, D.J., Powles, S.B. (2007) Herbicide resistance and the adoption of integrated weed management by Western Australian grain growers. Agricultural Economics, 36, 121-128.

Steadman, K.J., Eaton, D.M., Plummer, J.A., Ferris, D.G., Powles, S.B. (2006) Late season non-selective herbicide application reduces Lolium rigidum seed numbers, seed viability and seedling fitness. Australian Journal of Agricultural Research, 57, 133-141.

Llewellyn, R.S., Pannell, D.J., Lindner, R.K., Powles, S.B. (2005) Targeting key perceptions when planning and evaluating extension. Australian Journal of Experimental Agriculture, 45, 1627-1633.

Walsh, M.J., Minkey, D.M., Powles, S.B. (2005) Field evaluation of preseason applications of residual herbicides to control annual ryegrass (Lolium rigidum). Plant Protection Quarterly. 20, 133-139.

Llewellyn R.S., Lindner, R., Pannell, D.J. Powles, S.B. (2004) Grain grower perceptions and use of integrated weed management. Australian Journal of Experimental Agriculture, 44, 993-1001.

Walsh, M.J., Devlin, R., Powles, S.B. (2004) Potential for preseason herbicide application to prevent weed emergence in the subsequent growing season. 1. Identification and evaluation of possible herbicides. Weed Technology, 18, 228-235.

Lllewellyn, R.S., Lindner, R.K., Pannell, D.J, Powles, S.B. (2002) Resistance and the herbicide resource: Perceptions of Western Australian grain growers. Crop Protection. 21, 1067-1075.

Llewellyn, R.S., Lindner, R.K., Pannell, D.J., Powles, S.B. (2001) Herbicide resistance and the decision to conserve the herbicide resource: review and framework. Australian Agribusiness Review 9.

Hole, SJW., McClure, NC., Powles, SB. (2001) Persistence and management of enhanced bio degradation in soil. Weed Research, 41, 341-349.

Hole, SJW., McClure, NC., Powles, SB. (2001) Rapid degradation of carbetamide upon repeated application to Australian soils. Soil Biology & Biochemistry, 33, 739-745.

Hole, S.J.W., Powles S.B. (1997) Reduced efficacy and enhanced degradation of carbetamide after repeated application in Australia. Weed Research 37, 165-170.

Powles, S.B. (1997) Success from adversity: Herbicide resistance can drive changes to sustainable weed management systems. Brighton Crop Protection Conf 10B-1. 1119-1126.

Powles, S.B., Matthews, J.M. (1996) Integrated weed management for the control of herbicide resistant annual ryegrass (Lolium rigidum). Second International Weed Control Congress. Copenhagen. 407-413.

Nietschke, B.S., Reeves, T.G., Matthews, J.M., Powles, S.B. (1996) Components of an integrated weed management strategy to control herbicide-resistant Avena spp.-An Australian perspective. Second International Weed Control Congress. Copenhagen. 493-498.

Matthews, J.M., Powles, S.B. (1995) Managing herbicide resistant annual ryegrass: Southern Australian research. Eleventh Australian Weeds Conference. 537-541.

L) Modelling for resistance management.

Renton, M., Diggle A., Manalil, S., Powles, S.B. (2011) Does cutting herbicide rates threaten the sustainability of weed management in cropping systems. Journal of Theoretical Biology, 283, 14-27.

Torra, J., Cirujeda, A., Recasens, J., Taberner, A., Powles, S.B. (2010) PIM (Poppy Integrated Management): A bio-economic decision support model for the management of Papaver rhoeas in rain-fed cropping systems. Weed Research, 50, 127-139.

Monjardino, M., Pannell, D.J., Powles, S.B. (2005) The economic value of glyphosate-resistant canola in the management of two widespread crop weeds in a Western Australian farming system. Agricultural Systems, 84, 297-315.

Monjardino, M., Pannell, D.J., Powles, S.B. (2004) The economic value of haying and green manuring in the integrated management of annual ryegrass and wild radish in a Western Australian farming system. Australian Journal of Experimental Agriculture. 44, 1195-1203.

Monjardino, M., Pannell, D.J., Powles, S.B. (2004) The economic value of pasture phases in the integrated management of annual ryegrass and wild radish in a Western Australian farming system. Australian Journal of Experimental Agriculture. 44, 265-271.

Pannell, D.J., Stewart, V., Monjardino, M., Bennett, A., Schmidt, C., Powles, S.B. (2004) RIM: a bioeconomic model for integrated weed management of Lolium rigidum in Western Australia. Agricultural Systems. 79, 305-325.

Monjardino, M., Pannell, D.J., Powles, S.B. (2003) Multi-species resistance and integrated management: A bio-economic model for integrated management of rigid ryegrass (Lolium rigidum) and wild radish (Raphanus raphanistrum). Weed Science, 51, 798-809.

M) Biology of crop weeds.

Goggin, D.E., Powles, S.B., Steadman, K.J. (2012) Understanding Lolium rigidum seeds: The key to managing a problem weed? Agronomy, 2, 222-239.
Borger, C.P.D., Scott, J.K., Renton, M., Walsh, M., Powles, S.B. (2009) Assessment of management options for Salsola australis in south-west Australia by transition matrix modelling. Weed Research, 49, 400-408.

Borger, C.P.D., Scott, J.K., M., Walsh, M., Powles, S.B. (2009) Demography of Salsola australis populations in the agricultural region of south-west Australia. Weed Research, 49, 391-399.

Borger, C.P.D., Yan, G., Scott, J.K., Walsh, M.J., Powles, S.B. (2008) Salsola tragus or S. australis (Chenopodiaceae) in Australia – untangling taxonomic confusion through molecular and cytological analyses. Australian Journal of Botany, 56, 600-608.

Borger CPD, Walsh, M, Scott, JK, Powles SB. (2007) Tumbleweeds in the Western Australian cropping system: seed dispersal characteristics of Salsola australis. Weed Research, 47, 406-414.

Powles, S.B., Charman, N., Poole, F. (1988) Solar heating (solarization) of the soil surface: Effect on weed control and yield of Phaseolus vulgaris. Plant Protection Quarterly. 3: 31-35.

N) Seed dormancy in crop weed species.

Goggin, D.E., Powles, S.B. (2012) Selection for low dormancy in annual ryegrass (Lolium rigidum) seeds results in high constitutive expression of a glucose-responsive  –amylase isoform. Annals of Botany, 110, 1641-1650.

Long, R.L., Stevens, J.C., Griffiths, E.M., Adamek, M., Powles, S.B., Merritt, D.J. (2011) Detecting karrikinolide responses in seeds of the Poaceae. Australian Journal of Botany, 59, 609-619.

Long, R.L., Stevens, J.C., Griffiths, E.M., Adamek, M., Gorecki, M.J., Powles, S.B., Merritt, D.J. (2011) Seeds of Brassicaceae weeds have an inherent or inducible response to the germination stimulant karrikinolide. Annals of Botany, 108, 933-944.

Owen, M.J., Michael, P.J., Renton, M., Steadman, K.J., Powles, S.B. (2011) Towards large-scale prediction of Lolium rigidum emergence. 1. Can climate be used to predict dormancy parameters? Weed Research, 51, 123-132.

Owen, M.J., Michael, P.J., Renton, M., Steadman, K.J., Powles, S.B. (2011) Towards large-scale prediction of Lolium rigidum emergence. II. Correlation between dormancy and herbicide resistance levels suggests an impact of cropping systems. Weed Research, 51, 133-141.
Goggin, D.E., Powles, S.B., Toorop, P.E., Steadman, K.J. 2011. Dark-mediated dormancy release in stratified Lolium rigidum seeds is associated with higher activities of cell call-modifying enzymes and an apparent increase in gibberellin sensitivity. Journal of Plant Physiology, 168, 527-533.

Goggin, D.E., Powles, S.B., Steadman, K.J. (2011) Selection for low or high primary dormancy in Lolium rigidum Gaud seeds results in constitutive differences in stress protein expression and peroxidise activity. Journal of Experimental Botany, 62, 1037-1047.

Goggin, D.E., Emery, R.J.N., Powles, S.B., Steadman, K.J. (2010) Initial characterisation of low and high seed dormancy populations of Lolium rigidum produced by repeated selection. Journal of Plant Physiology, 167, 1282-1288.


Long RL, Williams K, Griffiths EM, Flematti GR, Merritt DJ, Stevens JC, Turner SR, Powles SB, Dixon KW. (2010). Prior hydration of Brassica tournefortii seeds reduces the stimulatory effect of karrikinolide on germination and increases seed sensitivity to abscisic acid. Annals of Botany, 105: 1063-1070.

Goggin, D.E., Steadman, K.J., Emery, R.J.N., Farrow, S.C., Benech-Arnold, R.L., Powles, S.B. (2009) ABA inhibits germination but not dormancy release in mature imbibed seeds of Lolium rigidum Gaud. Journal of Experimental Botany, 60, 3387-3396.

Goggin, D.E., Steadman, K.J., Powles, S.B. (2008) Green and blue light photoreceptors are involved in maintenance of dormancy in imbibed annual ryegrass (Lolium rigidum) seeds. New Phytologist, 180, 81-89.

4.: Photoinhibition of Photosynthesis

Ludlow, M.M., Powles, S.B. (1988). Effect of photoinhibition induced by water stress on growth and yield of grain sorghum. Aust. J. Plant Physiol. 15: 179-194.

Marot-Gaudry, J.F., Farineau, J., Lelandais, M., Moutot, F., Powles, S.B. and Cornic, G. (1986) Photoinhibition in leaves of Phaseolus vulgaris : metabolic approach. Physiologie Vegetale 24, 541-549.

Björkman, O., Powles, S.B., (1984) Inhibition of photosynthetic reactions under water stress: Interaction with light level. Planta 161, 490-504.

Powles, S.B., Cornic, G., Louason, G. (1984) Photoinhibition of photosynthesis induced by strong light in the absence of CO2: an appraisal of the hypothesis that photorespiration protects against photoinhibition. Physiologie Vegetale 22, 437-446.

Powles, S.B., Berry, J.A., Björkman, O. (1983) Interaction between light and temperature on the inhibition of photosynthesis in chilling-sensitive plants. Plant, Cell and Environment 6, 117-123.

Powles, S.B., Chapman, K.S.R., Whatley, F.R. (1982) Effect of photoinhibition treatments on subsequent activity of light-activated enzymes of C3 and C4 photosynthetic carbon metabolism. Plant Physiol. 69. 371-74.

Powles, S.B., Björkman, O. (1982) Photoinhibition of photosynthesis: Effect on chlorophyll fluorescence at 77 K in intact leaves and in chloroplast membranes of Nerium oleander. Planta 156, 97-107.

Powles, S.B., Thorne, S.W. (1981) Effect of high-light treatments in inducing photoinhibition of photosynthesis in intact leaves of low-light grown Phaseolus vulgaris and Lastreopsis microsora. Planta, 152, 471-77.

Fork, D., Oquist, G., Powles, S.B., (1981) Photoinhibition in Bean: A fluorescence analysis. Carnegie Yearbook, 80. 52-57.

Björkman, O., Powles, S.B. (1981) Leaf movement in the shade species Oxalis oregano. I. Response to light level and light quality. Carnegie Yearbook 80. 59-62.

Powles, S.B., Bjorkman, O. (1981) Leaf movement in the shade species Oxalis oregano. II.
Role in protection against injury by intense light. Carnegie Yearbook 80. 63-66.

Osmond, C.B., Winter, K., Powles, S.B., (1980) Adaptive significance of carbon dioxide cycling during photosynthesis in water-stressed plants. IN: Adaptation of Plants to Water and High Temperature Stress, N.C. Turner and P.J. Kramer (eds.). John Wiley and Sons, pp. 139-154.

Powles, S.B., Chapman, K.S.R., Osmond, C.B. (1980) Photoinhibition of intact attached leaves of C4 plants : dependence on CO2 and O2 partial pressures. Aust. J. Plant Physiol., 7, 737-47.

Powles, S.B., Critchley, C. (1980) Effect of light intensity during growth on photoinhibition of intact attached bean leaflets. Plant Physiol. 65: 1181-1187.

Powles, S.B., Osmond, C.B., Thorne, S.W. (1979) Photoinhibition of intact attached leaves of C3 plants illuminated in the absence of both CO2 and of photorespiration. Plant Physiol. 64, 982-88.

Powles, S.B., Osmond, C.B. (1978) Inhibition of the capacity and efficiency of photosynthesis in bean leaflets illuminated in a CO2 free atmosphere at low O2: a possible role for photorespiration. Aust. J. Plant Physiol. 5: 619-29.

5. Book Chapters:

Vila-Aiub, M.M., Neve, P., Powles, S.B. (2005). Fitness costs of evolved herbicide resistance. In: Encyclopaedia of Pest Management. Ed. D. Pimmental. Marcel Dekker Publishers. NY. USA. pp.1-3.

Preston, C. and Powles, S.B. (2002) Mechanisms of multiple herbicide resistance in Lolium rigidum. In: Agrochemical Resistance: Extent, Mechanism & Detection. Eds. J.M. Clark & I. Yamaguchi, Oxford University Press. pp. 150-160.

Powles, S.B. and Bowran. D.G. (2000) Crop Weed Management Systems. In: Australian Weed Management Systems. Ed. B. Sindel. Publishers: R.G. & F.J. Richardson. pp. 287-306.

Rieger, M.A., Preston, C., Potter, T., Powles, S.B. (1999) Gene flow from transgenic canola to wild radish – a model system to determine the risks. In: Lutman, P.J.W. (Ed) Gene Flow and Agriculture: Relevance for Transgenic Crops. British Crop Protection Council, pp. 131-136

Powles, S.B. and Preston, C. (1999) Herbicide Resistance: A case of rapid evolution. In: Plants in Action: Adaptation in Nature, Performance in Cultivation. Ed. B. Atwell, P. Kriedemann and C. Turnbull. Pub: Macmillan Education Australia. pp. 607-613.

Tardif, F.J., Preston, C., Powles, S.B. (1997) Mechanisms of herbicide multiple resistance in Lolium rigidum. In: Weed and Crop Resistance to Herbicides. Ed. R. DePrado, J. Jorrin & L. Garcia-Torres. Kluwer Academic Publishers. pp.117-124.

Bowran, D.G., Hamblin, J., Powles, S.B. (1997) Incorporation of transgenic herbicide resistant crops into integrated weed management systems. In: Commercialisation of Transgenic Crops: Risk, Benefit and Trade Considerations. Ed. G.D. McLean, P.M.Waterhouse, G.Evans & M.J.Gibbs. D.P.I.E. Canberra, pp 301-312

Preston, C, Tardif, F.J., Powles, S.B. (1996) Multiple mechanisms and multiple herbicide resistance in Lolium rigidum. In: Molecular Genetics and Evolution of Pesticide Resistance. Ed. T. M. Brown, American Chemical Society Symposium Series 645. pp. 117-129.

Roush, R.T. and Powles, S. B. (1996) Pesticide Resistance: Why Be Concerned? In: Pesticide Resistance: Prevention and Management. Ed. G.W. Bourdot and D. M. Suckling. New Zealand Plant Protection Society. pp. 3-15.

Matthews, J.M., Powles, S.B. (1995) Glyphosate or glufosinate resistant transgenic crop and pasture species: Can target weeds develop resistance to these non-selective herbicides. In: Herbicide resistant crops and pastures in Australian farming systems. Ed. G.D.McLean & G. Evans, Bureau of Resource Sciences, Canberra. pp 253-257.

Hall, L.M., Holtum, J.A.M., Powles, S.B. (1994) Mechanisms responsible for cross resistance and multiple resistance. In: Herbicide Resistance in Plants: Biology and Biochemistry. Ed. S.B.Powles and J.A.M. Holtum, Lewis Press. pp. 243-261.

Tardif, F.J. and Powles, S.B. (1993) Target site-based resistance to herbicides inhibiting Acetyl-CoA carboxylase. Brighton Crop Prot. Conf. 5B-2, 533-540.

Powles, S.B. and Matthews, J.M. (1992) Multiple herbicide resistance in annual ryegrass (Lolium rigidum): A driving force for the adoption of integrated weed management strategies. In: Resistance 91: Achievements and Developments in Combating Pesticide Resistance. Elsevier Press. pp. 75-87.

Holtum, J.A.M., Powles, S.B. (1991) Annual ryegrass: An abundance of resistance. A plethora of mechanisms. Brighton Crop Prot. Conf. 8A-10, 1071-78.

Powles, S.B., Holtum, J.A.M., Matthews, J.M. and Liljegren, D.R. (1990) Herbicide cross resistance in annual ryegrass (Lolium rigidum): The search for a mechanism. In: ACS Symposium Series. Managing Resistance to Agrochemicals: Ed. M.B.Green, W.K.Moberg and H.M.LeBaron. American Chemical Society Press. pp. 394-406.
Roles, responsibilities and expertise
Major world grain crops.
Funding received
Major funding from the Grains Research & Development Corporation. Funding from Australian Research Council Linkage Grants.
Industrial relevance
High relevance to the Australian grains industry. High relevance to agrichemical corporations.
Languages
English and French
Honours and awards
currentISI Highly Cited (top 0.5% cited plant scientists worldwide)
Institute of Scientific Information, (isihighlycited.com) USA

2012 Australian Academy of Science - Fellow
2010 GRDC “Seed of Light” Award
2001 Centenary Medal – Federation of Australia
1999 Fellow- Australian Academy Technological Sciences & Engineering (elected 1999)

Honorary International Fellow-WSSA (USA)
CAWSS Medal for Research Excellence (Australia)
CSIRO Overseas Postdoctoral Fellowship (USA, 1980-81)
Rotary International Ambassadorial Fellowship(USA, 1975-76)
Previous positions
Chief Executive Officer, Australian Weed Management CRC, Adelaide
Professor, University of Adelaide
Postdoc, University of Paris & CNRS, Gif-sur-Yvette, France
1980-1981Postdoc, Stanford University, Carnegie Plant Biology, USA.
Teaching
Integrated Pest Management
Current external positions
Australian Academy of Science: Securing Australia's Future Steering Committee
Australian Academy of Science: Agriculture, Food & Fisheries National Committee
National Integrated Weed Management Committee Member
National Insecticide Resistance Management Committee Member
Useful links
www.ahri.uwa.edu.au
New and noteworthy
In 2010 won the GRDC 'Seed of Light' award for contribution to agriculture.
Current projects
Four Grains R+D projects
Two Australian Research Council projects
Research profile
Research profile and publications
 

The University of Western Australia

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