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A resistance mechanism dependent upon the inhibition of ethylene biosynthesis
Author(s) -
Xu Jiangyan,
Lv Bo,
Wang Qiong,
Li Jun,
Dong Liyao
Publication year - 2013
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3524
Subject(s) - ethylene , atp synthase , biosynthesis , biology , oxidase test , echinochloa crus galli , enzyme , botany , biochemistry , echinochloa , weed , catalysis
Background The highly selective auxin‐type herbicide quinclorac is widely used to control important dicotyledon and monocotyledon weeds in rice fields. Echinochloa crusgalli var. zelayensis is one of the most troublesome weeds in China, and is very difficult to control in east China due to misuse of herbicides . Results The J ZD ‐R, J TJ ‐R, J CW ‐R and S SX ‐R biotypes of E. crusgalli var. zelayensis had resistance to quinclorac with resistance levels ranked as J ZD ‐R < J TJ ‐R < J CW ‐R < S SX ‐R. Growth reduction in different biotypes was positively correlated with ethylene production. Stimulated levels of ethylene and 1‐aminocyclopropane‐1‐carboxylic acid ( ACC ) and activities of ACC synthase and ACC oxidase in resistant biotypes were less than the susceptible biotype, and were negatively correlated with quinclorac resistance levels, suggesting that inhibition of ethylene biosynthesis was positively correlated with resistance levels . Conclusion Considering the resistance‐dependent inhibition in the ethylene biosynthetic pathway, the mechanisms of resistance to quinclorac in E. crusgalli var. zelayensis involved alteration(s) in the ethylene response pathway, consisting of at least alteration in induction of the enzymes activity of ACC synthase and ACC oxidase. © 2013 Society of Chemical Industry