The resistance of Echinochloa crusgalli (L.) Beauv. to quinclorac was determined by using pot planting method with 42 biotypes collected from the rice growing regions in the middle and lower reaches of the Yangtze River in China from 2008 to 2011.The results showed that higher resistance levels were observed in two biotypes of E. crusgalli from Yiyang County (R1) and Wangcheng County (R2), Hunan Province with the resistance indexes (RI) of 21.84 and 32.31fold, respectively. Other biotypes of E. crusgalli. from Hunan, Jiangsu and Zhejiang Province have developed lower level resistance (1.12-7.32fold). The 1aminocyclopropane1carboxylate synthase (ACS) activity in the two resistance biotypes of E. crusgalli (R1 and R2) declined significantly one day after quinclorac treatment, with the RIs of 0.49 and 0.56fold compared with the contemporary contro1. Then the activity increased slightly two days after treatment and remained to be lower than the control; however the activity decreased slowly to 0.34 and 0.35fold relative to the control at four days after treatment The βcyanoalanine (βCAS) activity in R1 and R2 of E. crusgalli increased significantly after treated with quinclorac; the maximum were observed five days after treatment, being 1.80 and 2.05fold, as high as the control, respectively.
MA Guolan1,2, BAI Lianyang1,4，*， LIU Ducai2, LIU Xueyuan2, YU Liuqing3，*
. Resistance of Echinochloa crusgalli (L.) Beauv. to Quinclorac in the Rice Growing region of the Middle and Lower Reaches of Yangtze River in China[J]. Chinese Journal OF Rice Science, 2013
, 27(2)
: 184
-190
.
DOI: 10.3969/j.issn.10017216.2013.02.011
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