Resistance of Eleusine indica to acetyl-CoA carboxylase-inhibiting herbicides in direct-seeded rice and its molecular mechanism
Received:October 06, 2018    Download the full
DOI:10.16801/j.issn.1008-7303.2019.0023
Key Words:Eleusine indica  ACCase-inhibiting herbicide  resistance  gene mutation  molecular mechanism
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Author NameAffiliationE-mail
YUAN Guohui Shanghai Academy of Agricultural Sciences, Shanghai 201403, China  
TIAN Zhihui Shanghai Academy of Agricultural Sciences, Shanghai 201403, China  
LI Tao Shanghai Academy of Agricultural Sciences, Shanghai 201403, China  
QIAN Zhenguan Shanghai Academy of Agricultural Sciences, Shanghai 201403, China  
GAO Ping Shanghai Academy of Agricultural Sciences, Shanghai 201403, China  
LIU Shibing Anshun University, Anshun 561000, Guizhou Province, China  
SHEN Guohui Shanghai Academy of Agricultural Sciences, Shanghai 201403, China ghshen65@163.com 
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Abstract:
      The objectives of this study were to illuminate the sensitivity of Eleusine indica population in rice field of direct seeding to acetyl-CoA carboxylase (ACCase)-inhibiting herbicides and reveal its molecular resistance mechanism. Whole-plant bioassay showed that the population SJ-1 was highly resistant to metamifop, cyhalofop-butyl, fenoxaprop-p-ethyl, haloxyfop-R-methyl and sethoxydim, with resistance indexes of 56.6, 62.5, 128, 52.0 and 16.3, respectively. And it was slightly resistant to clethodim, with a resistance index of 4.86. By comparing the partial ACCase sequences derived from the resistant and susceptible populations, the SJ-1 population was found to contain one amino acid substitution of aspartate (GAT) for glycine (GGT) at the codon position 2078. This mutation in the ACCase gene might be responsible for the resistance to ACCase-inhibiting herbicides in the resistant population of E. indica.
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