稗草对二氯喹啉酸抗性研究进展

生长素类除草剂二氯喹啉酸在我国使用了20多年,目前,稻田稗草对二氯喹啉酸产生了抗性,抗二氯喹啉酸稗草逐渐成为我国南北稻区的防除难题。稗草抗二氯喹啉酸机理比较复杂,从稗草感知二氯喹啉酸到产生氰化物的过程是通过生长素信号通路到乙烯信号通路传导的,期间发生了复杂的基因调控和相关酶的从头合成。最新研究认为,稗草主要通过提高氰化物解毒酶——氰丙氨酸合成酶(β-CAS)的活性和控制有毒氰化物的产量产生抗药性。本文综述了二氯喹啉酸的除草机理与稗草对二氯喹啉酸抗性这两个密切相关问题的研究进展。

Research Advances on Resistance of Barnyard Grass(Echinochloa crusgalli) to Quinclorac

Quinclorac is a auxinic herbicide that has been widely used over 20 years in China. The resistance of barnyard grass（Echinochloa crusgalli） to quinclorac has evolved by now. It gradually become a problem that is difficult to control quinclorac - resistant barnyard grass in south and north rice regions of China. The resistant mechanism of barnyard grass to quinelorac were very complicated. It is thought that from barnyard grass perception of quinclorac to cyanide production, the signal transduction pathway involved in the auxin pathway to ethylene pathway during the regulation of complex gene and the de novo synthesis of related enzyme. The latest studies suggested that barnyard grass develop resistance to quin- elorac mainly through improving the activity of the cyanide detoxification enzymes β- cyanoalanine synthase （β - CAS） and controlling the production of toxic cyanide. This article reviews the research progress on the two closely related issues：controlling weed mechanism of quinclorac and resistance of barnyard grass to quinclorac.