A novel negative thermotaxis behavior in rice planthoppers is regulated by TRPA1 channel

作者：Hualiang He, Rui Zhao, Kui Hu, Lin Qiu, Wenbing Ding, Youzhi Li · 发表于：Pest Management Science · 年份：2020 · DOI：10.1002/ps.5846 · 被引用次数：13 · 研究领域：Insect-Plant Interactions and Control、Ion Channels and Receptors、Neurobiology and Insect Physiology Research

BACKGROUND: In the field, we observed that many white-backed planthoppers (Sogatella furcifera, WBPHs) stayed in the top region of rice plants exposed to direct sunshine. It was known that WBPHs frequently took flight when the ground temperature was about 25 °C, then climbed to and flew in a dense layer corresponding to an air temperature of about 16 °C in the sky. Its migration height was higher than the top of the surface temperature inversion. It is still unclear whether WBPHs prefer warm or cold regions, and therefore we studied the thermal responses of WBPHs and other insects using a simulated system. RESULTS: We found that WBPHs preferred a cold region to a warm one, unexpectedly below their comfort temperature zone. After comparative analysis with other insect species, such as small brown planthoppers, brown planthoppers, Trialeurodes vaporariorum (stinkbugs, a predator of planthoppers) and Bemisia tabaci (whitefly), only three planthoppers showed cold preference behavior. RNA interference experiments revealed that this behavior of WBPHs can be regulated by the transient receptor potential (TRP) channels TRPA1 channel. Furthermore, podocarpic acid, an agonist of TRPA1, weakened the cold preference, whereas A-967079, an antagonist of TRPA1, had the opposite effect. CONCLUSION: We reported a novel cold preference (negative thermotaxis) in rice planthoppers that was regulated in WBPHs by the TRPA1 channel. Cold preference of rice planthoppers is probably related to its ch...