Pest Management Science (2013) 69, 1407-1414

Jiangyan Xu, Bo Lv, Qiong Wang, Jun Li and Liyao Dong (2013)
A resistance mechanism dependent upon the inhibition of ethylene biosynthesis
Pest Management Science 69 (12), 1407-1414
Abstract:
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Liyao Dong

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Echinochloa crus-galli (weed)