User profiles for S. Powles

Stephen Powles

Professor - University of Western Australia
Verified email at uwa.edu.au
Cited by 35291

Photoinhibition of photosynthesis induced by visible light

SB Powles - Annual review of plant physiology, 1984 - annualreviews.org
… Vernotte and S. B. Powles, unpublished), a result which suggests that the loss of … There
must be a lesion(s) at the PSII reaction centers which lessens the efficiency of photochemistry …

Glyphosate: a once‐in‐a‐century herbicide

SO Duke, SB Powles - Pest Management Science: formerly …, 2008 - Wiley Online Library
… There are no proven cases of complete introgression of herbicide resistance gene(s) from
a naturally resistant crop to an associated weed in the field. That weeds closely related to …

Evolution in action: plants resistant to herbicides

SB Powles, Q Yu - Annual review of plant biology, 2010 - annualreviews.org
… Having written this review during a sabbatical period, S. Powles thanks the OECD and
Australian Academy of Science for support and Dr. Xavier Reboud and colleagues at INRA, Dijon, …

Reducing the risks of herbicide resistance: best management practices and recommendations

…, TM Webster, KW Bradley, G Frisvold, SB Powles… - Weed …, 2012 - cambridge.org
Herbicides are the foundation of weed control in commercial crop-production systems. However,
herbicide-resistant (HR) weed populations are evolving rapidly as a natural response to …

Evolved resistance to glyphosate in rigid ryegrass (Lolium rigidum) in Australia

SB Powles, DF Lorraine-Colwill, JJ Dellow… - Weed science, 1998 - cambridge.org
… Values are LDso·s calculated by probit analysis of the full dose response. Values in
parenthesIS represent the 95% confidence intervals. RlS is the ratio of LDso of the resistant …

Evolved glyphosate‐resistant weeds around the world: lessons to be learnt

SB Powles - Pest Management Science: formerly Pesticide …, 2008 - Wiley Online Library
… GRCs tolerate glyphosate well, and glyphosate can be effective against large weeds, ensuring
that there is flexibility in the timing of glyphosate treatment(s). The simplicity, consistency …

Pollen-mediated movement of herbicide resistance between commercial canola fields

MA Rieger, M Lamond, C Preston, SB Powles… - Science, 2002 - science.org
There is considerable public and scientific debate for and against genetically modified (GM)
crops. One of the first GM crops,Brassica napus (oilseed rape or canola) is now widely …

Metabolism-based herbicide resistance and cross-resistance in crop weeds: a threat to herbicide sustainability and global crop production

Q Yu, S Powles - Plant physiology, 2014 - academic.oup.com
… sites of action and can extend to new herbicide(s). Cytochrome P450 monooxygenase,
glycosyl transferase, and glutathione S-transferase are often implicated in herbicide metabolic …

Resistance to AHAS inhibitor herbicides: current understanding

Q Yu, SB Powles - Pest management science, 2014 - Wiley Online Library
… /S ratios) (although it might be worth noting that GR 50 R/S ratios are more variable than LD
50 ratios dependent on the design, conditions and, in particular, the length of experiments). …

Inhibition of photosynthetic reactions under water stress: interaction with light level

O Björkman, SB Powles - Planta, 1984 - Springer
… gmol m- z s- 1) and the kinetics of the fluorescence emission measured at 692 and 734
nm, using the same light source, filters and procedure described in Powles and Bjdrkman (1982). …