Foba Caroline Ngichop, Shi Jin-Hua, An Qing-Qing, Liu Le, Hu Xin-Jun, Hegab Mahmoud Ali Morse Soliman, Liu Hao, Zhao Pei-Min, Wang Man-Qun
Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei Province, P. R. China.
Lincoln University, College of Agriculture, Environmental and Human Sciences, Cooperative Extension, 65101, Jefferson City, MO, USA.
Pest Manag Sci. 2023 Jan;79(1):105-113. doi: 10.1002/ps.7178. Epub 2022 Sep 30.
Plants respond to attackers by triggering phytohormones signaling associated metabolites, including herbivore-induced plant volatiles (HIPVs). HIPVs can indirectly act against herbivory by recruitment of natural enemies and priming of neighboring plants. Ostrinia furnacalis and Mythimna separata are important insect herbivores of maize plants that have a devastating influence on yield. However, little is known about how maize temporally reconfigures its defense systems against these herbivores and variation of neighboring plant resistance.
This study investigated the effects of HIPVs on the behavior of the dominant predatory beetle Harmonia axyridis and priming in neighboring maize defense against O. furnacalis and M. separata over time. The results showed that maize damaged by either O. furnacalis or M. separata enhanced the release of volatiles including terpenes, aldehydes, alkanes and an ester, which elicited an increased attractive response to H. axyridis after 3 and 12 h, respectively. O. furnacalis damage resulted in accumulations of leaf jasmonic acid (JA) and salicylic acid in maize after 6 and 3 h, respectively, while M. separata damage only raised the JA level after 3 h. Furthermore, HIPVs were able to prime neighboring plants through the accumulation of JA after 24 h. Both larvae showed a significant decrease in weight accumulation after 48 h of feeding on the third leaves of the primed plant.
Taken together, the findings provide a dynamic overview of how attacked maize reconfigures its volatiles and phytohormones to defend against herbivores, as well as priming of neighboring plants against oncoming attacks. © 2022 Society of Chemical Industry.
植物通过触发与植物激素信号相关的代谢产物来应对攻击者，其中包括食草动物诱导的植物挥发物（HIPVs）。HIPVs可以通过招募天敌和使邻近植物产生防御 priming 来间接抵御食草动物。亚洲玉米螟和粘虫是玉米的重要食草昆虫，对产量有毁灭性影响。然而，关于玉米如何随时间重新配置其防御系统以抵御这些食草动物以及邻近植物抗性的变化，我们知之甚少。
本研究调查了HIPVs对优势捕食性甲虫异色瓢虫行为的影响，以及随着时间推移邻近玉米对亚洲玉米螟和粘虫防御的 priming 作用。结果表明，被亚洲玉米螟或粘虫损害的玉米增强了包括萜类、醛类、烷烃和一种酯类在内的挥发物释放，分别在3小时和12小时后对异色瓢虫产生了更强的吸引反应。亚洲玉米螟的损害分别在6小时和3小时后导致玉米叶片茉莉酸（JA）和水杨酸积累，而粘虫损害仅在3小时后提高了JA水平。此外，24小时后HIPVs能够通过JA的积累使邻近植物产生防御 priming。两种幼虫在取食经过 priming 处理的植株第三片叶48小时后，体重积累均显著下降。
综上所述，这些发现提供了一个动态概述，即受攻击的玉米如何重新配置其挥发物和植物激素以抵御食草动物，以及使邻近植物对即将到来的攻击产生防御 priming。© 2022化学工业协会。
