Recognition properties of auxin receptors underlying selective herbicidal actions among grass species

二氯喹啉酸是属于喹啉羧酸家族的植物生长素除草剂之一，并且作用模式被认为与属于苯氧基乙酸家族的植物生长素除草剂2，4-D相同。二氯喹啉酸在草种中表现出高度的选择性，其选择性作用的主要机制被认为是乙烯生物合成的选择性诱导，这最终导致氰化物在敏感草种中的积累。本研究对二氯喹啉酸的作用方式和生长素受体的识别特性进行了研究。我们的研究结果强烈表明，二氯喹啉酸有不同的行动从2，4-D在几个敏感的草种;二氯喹啉酸诱导的生长减少可能是由活性氧，但不是由氰化物。

Quinclorac is one of the auxinic herbicides belonging to the quinolinecarboxylic acid family, and the mode of action has been thought to be the same as with 2, 4-D, an auxinic herbicide belonging to the phenoxyacetic acid family. Quinclorac exhibits high selectivity among grass species, and the primary mechanism underlying its selective action has been considered to be the selective induction of ethylene biosynthesis, which ultimately leads to cyanide accumulation in susceptible grasses. In this study, the mode of action of quinclorac and recognition properties of auxin receptors were investigated. Our results strongly suggest that quinclorac has a different action from 2, 4-D in several susceptible grass species ; quinclorac-induced growth reduction may be caused by ROS, but not by cyanide.