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Molecular basis of resistance to tribenuron-methyl in Descurainia Sophia (L.) populations from China |
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| Authors: | Xue jing HanYi Dong Xiao na SunXue feng Li Ming qi Zheng |
| Institution: | Department of Applied Chemistry, China Agricultural University, No. 2 of Yuan Ming Yuan Xilu, Haidian District, Beijing 100193, China |
| Abstract: | Two Descurainia Sophia populations, HB16 and HB08, were discovered in China and exhibit high resistance levels to tribenuron-methyl. Resistance ratio values of HB16 and HB08 were 153.47 and 651.20, respectively. The extractable acetohydroxy acid synthase (AHAS) activity was similar between resistant and susceptible populations. However, AHAS from HB16 and HB08 was less sensitive to inhibition of tribenuron-methyl comparing to susceptible population. The tribenuron-methyl I50 values for HB16 and HB08 were 46.25 and 54.07 greater than that for susceptible population respectively. Pro-197-Ser and Pro-197-Leu mutations were identified in AHAS extracted from HB16 and HB08 plants respectively. AHAS insensitivity of resistant D. Sophia caused by Pro197 mutation could be responsible for high resistance to tribenuron-methyl. |
| Keywords: | AHAS acetohydroxy acid synthase SUs sulfonylureas IMIs imidazolinones TPs triazolopyrimidines PTBs pyrimidinyl-thiobenozoates SCTs sulfonylamino-carbonyl-triazolines R herbicide-reisistant population S herbicide-susceptible population GR50 herbicide rate causing 50% growth reduction of plants I50 herbicide concentration causing 50% inhibition of the ALS activity |
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