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^: *http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3180 /issues - 2011 . (http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3180/ issues - 2011 .)
^: Owen M.J.; Michael P.J.; Renton M.; Steadman K.J.; Powles S.B.
^: Towards large-scale prediction of Lolium rigidum emergence [ . . 2. -, , - . ()]. Pt 2. Correlation between dormancy and herbicide resistance levels suggests an impact of cropping systems
^: Weed Research, 2011; Vol.51,N 2. - P. 133-141
^: 2011
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^: This study investigated a possible link between seed dormancy and herbicide resistance status of Lolium rigidum (annual or rigid ryegrass). Mature seeds were collected from 406 populations across the 14-million hectare grain belt of southern Western Australia. For each population, initial dormancy and change in dormancy over a 6-month period were measured, and resistance status of seedlings to four herbicides (diclofop-methyl, sethoxydim, clethodim and sulfometuron-methyl) was assessed. Greater seed dormancy correlated with higher levels of herbicide resistance for all four herbicides tested. The herbicides represented two modes of action (acetyl CoA carboxylase- and acetolactate synthase inhibitors) and a contrast of generalist (metabolic) and target-site mutation mechanisms. The coexistence of dormancy and herbicide resistance is suggested to be an adaptation to decades of intense cropping; the plants that are most likely to successfully reproduce are those that exhibit delayed germination (avoiding pre-seeding weed control strategies) and possess herbicide resistance (surviving subsequent in-crop herbicide application). We propose that herbicide resistance status may have a role as a predictive tool in modelling dormancy in L. rigidum at a large spatial scale. aref1

^TRN: 1392155
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