Electrical penetration graph evidence that pymetrozine toxicity to the rice brown planthopper is by inhibition of phloem feeding
Electrical penetration graph evidence that pymetrozine toxicity to the rice brown planthopper is by inhibition of phloem feeding
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电穿透图证明吡蚜酮对稻褐飞虱的毒性是通过抑制韧皮部取食来实现的
DOI：
10.1002/ps.2098
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发表时间：
2011-04-01
影响因子：
4.1
通讯作者：
Zhu, Yu Cheng
中科院分区：
文献类型：
--
作者：
He, Yueping;Chen, Li;Zhu, Yu Cheng
背景技术背景：吡蚜酮是一种很有应用价值的新型杀虫剂，可用于防治水稻上的重要害虫褐飞虱。结果：吡蚜酮对稻飞虱取食行为的影响主要表现为拒食作用，导致稻飞虱的饥饿和死亡。而不是神经毒性。吡蚜酮处理的昆虫死亡的速度显着低于饥饿处理的昆虫。电子穿透图（EPG）数据表明，吡蚜酮显着增加非探测期的持续时间，并有强烈的抑制韧皮部的摄入。抑制是强烈的剂量依赖性，导致在韧皮部区域的活性完全抑制时，吡蚜酮浓度增加到400毫克L-1。抑制韧皮部的摄食而引起的饥饿可能是吡蚜酮的主要毒性机制。EPG数据还表明，吡蚜酮对管心针运动和木质部汁液摄入持续时间没有显着影响。结论：研究表明，吡蚜酮扰乱了N.褐飞虱主要是通过增加非探测期和抑制韧皮部的摄食来实现的。这种抑制导致类似于饥饿的缓慢死亡。(C)2011年化学工业协会
BACKGROUND: Pymetrozine is a valuable novel insecticide for control of sucking insects, including the brown planthopper Nilaparvata lugens (Stal), one of the most serious pests on rice. This study was conducted to elucidate the action mechanisms of pymetrozine on the feeding behaviour of the planthopper.RESULTS: The activity test showed that pymetrozine primarily functioned as an antifeedant that caused starvation and death in N. lugens, rather than having neurotoxicity. Pymetrozine-treated insects died at a significantly slower speed than insects treated with starvation. Electrical penetration graph (EPG) data indicated that pymetrozine significantly increased the duration of non-probing periods and had a strong inhibition to phloem ingestion. The inhibition was strongly dose dependent, resulting in a complete suppression of the activity in the phloem region when the pymetrozine concentration was increased to 400 mg L-1. Starvation caused by inhibition of phloem ingestion might be a major toxicity mechanism of pymetrozine. EPG data also showed that pymetrozine had no significant effect on stylet movement and duration of xylem sap ingestion.CONCLUSION: The study revealed that pymetrozine disturbed the feeding behaviour of N. lugens mainly by increasing the non-probe period and inhibiting phloem ingestion. The inhibition resulted in a slow death similar to starvation. (C) 2011 Society of Chemical Industry