Shinde Sanket, Kundu Pritha, Louis Joe
Department of Entomology, University of Nebraska-Lincoln, Lincoln, NE 68583, U.S.A.
Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE 68583, U.S.A.
Mol Plant Microbe Interact. 2024 Mar;37(3):232-238. doi: 10.1094/MPMI-12-23-0213-FI. Epub 2024 Mar 28.
Flavonoids are major plant secondary metabolites that provide defense against several insect pests. Previously, it has been shown that sorghum () flavonoids are required for providing resistance to fall armyworm (FAW; ), which is an important chewing insect pest on several crops. We demonstrate here the role of FAW oral cues in modulating sorghum flavonoid defenses. While feeding, chewing insects release two kinds of oral cues: oral secretions (OS)/regurgitant and saliva. Our results indicate that FAW OS induced the expression of genes related to flavonoid biosynthesis and total flavonoids, thereby enhancing sorghum's defense against FAW larvae. Conversely, FAW saliva suppressed the flavonoid-based defenses and promoted FAW caterpillar growth, independent of the FAW salivary component, glucose oxidase (GOX). Thus, we infer that different oral cues in FAW may have contrasting roles in altering sorghum defenses. These findings expand our understanding of the precise modes of action of caterpillar oral cues in modulating plant defenses and help in designing novel pest management strategies against FAW in this vital cereal crop. [Formula: see text] Copyright © 2024 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
类黄酮是主要的植物次生代谢产物，可抵御多种害虫。此前已有研究表明，高粱类黄酮是高粱对草地贪夜蛾产生抗性所必需的，草地贪夜蛾是几种作物上的一种重要咀嚼式害虫。我们在此证明了草地贪夜蛾口腔信号在调节高粱类黄酮防御中的作用。在取食时，咀嚼式昆虫会释放两种口腔信号：口腔分泌物（OS）/反刍液和唾液。我们的结果表明，草地贪夜蛾口腔分泌物诱导了与类黄酮生物合成和总类黄酮相关的基因表达，从而增强了高粱对草地贪夜蛾幼虫的防御能力。相反，草地贪夜蛾唾液抑制了基于类黄酮的防御并促进了草地贪夜蛾幼虫的生长，这与草地贪夜蛾唾液成分葡萄糖氧化酶（GOX）无关。因此，我们推断草地贪夜蛾不同的口腔信号在改变高粱防御方面可能具有相反的作用。这些发现扩展了我们对毛虫口腔信号调节植物防御精确作用模式的理解，并有助于设计针对这种重要谷类作物上草地贪夜蛾的新型害虫管理策略。[公式：见正文] 版权所有© 2024作者。本文是一篇根据知识共享署名 - 非商业性使用 - 禁止演绎4.0国际许可协议分发的开放获取文章。
