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《Jiangsu Journal of Agricultural Sciences》 2015-03
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Susceptibility of weeds in Echinochloa to aryloxyphenoxypropionate herbicides and the mechanism

LI Yong-feng;ZHANG Zi-chang;YANG Xia;DONG Ming-chao;ZHANG Bin;HAN Jian-yong;Institute of Plant Protection,Jiangsu Academy of Agricultural Sciences;American FMC Corporation;  
Echinochloa( barnyardgrass) has long been considered as one of the most troublesome weeds,causing significant yield loss due to its superiority to rice in competition. The Echinochloa could be classified to eight geographic species in Jiangsu province of China. To date,however,limited information is available on susceptibility of eight Echinochloa species to aryloxyphenoxypropionate herbicides. Therefore,the aim of this study was to investigate the susceptibility differences of eight Echinochloa species to aryloxyphenoxypropionate herbicides using whole-plant bioassay,and their physiological bases was also explored. The results,based on clustering analysis of GR50 in dry matter after 25-day treatment,showed that E. crusgalli( L.) Beavu,and E.crusgalli Beauv var. zelayensis( H. B. K) Hitche were respectively susceptible to metamifop and cyhalofopbutyl,while E. crusgalli Beauv var. zelayensis( H. B. K) Schult was tolerant to both herbicides. The susceptible difference also existed in different populations of Echinochloa to two types of aryloxyphenoxypropionate herbicides. The analyses of the protective enzyme activities revealed that the content of malondialdehyde( MDA) increased in the stem and leaves of E. cruspavonis( H. B. K) Schult,E. crusgalli( L.) Beauv var. zelayensis( H. B. K) Hitche and E. crusgalli( L.) Beavu with the increased doses of aryloxyphenoxypropionate herbicides over time of the application of metamifop or cyhalofopbutyl,and the content of MDA in susceptible population was higher than that in tolerant population in the same dose treatment. The activities of peroxidase( POD),catalase( CAT),and superoxide dismutase( SOD) ascended at first and descended afterwards after two herbicides treatment. The increases in the protective enzymes activities of susceptible populations were lower than that in tolerant one. At the end of the treatment,three kinds of enzymes activities in the susceptible population were lower than that in tolerant one. The results indicated that the slight change and higher activities in membrane lipid peroxidase and lower content of MDA in aryloxyphenoxypropionate herbicides-tolerant population of Echinochloa might be responsible for the tolerance.
【Fund】: 江苏省农业科技自主创新基金项目[CX(13)3063];; 公益性行业(农业)科研专项项目(201303031)
【CateGory Index】: S451.21
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