College of Plant Science, Jilin University, Changchun, China.
Changchun Customs Technology Center, Changchun, China.
Pest Manag Sci. 2022 Feb;78(2):550-560. doi: 10.1002/ps.6660. Epub 2021 Oct 13.
Many herbivore-induced volatiles have been proven to act as signaling compounds to regulate nearby plant defense responses. However, the precise roles of key volatiles produced by maize roots after Holotrichia parallela larva feeding remain largely unknown.
We investigated changes in phytohormones and volatiles in maize roots after H. parallela larval infestation. Marked increases in the phytohormone jasmonic acid (JA) and the volatiles jasmone and tetradecane were induced by herbivores, whereas the salicylic acid content decreased. In addition, pre-exposure to tetradecane markedly increased the levels of the stress hormone JA, its precursors and derivatives, and related gene expression. In addition, pre-exposure altered the production of defensive benzoxazinoid secondary metabolites, resulting in increased plant resistance to H. parallela larvae. Plants pre-exposed to jasmone did not differ from control plants. In addition, bioassays showed that H. parallela larval growth was suppressed by feeding maize roots after pre-exposure to tetradecane.
These results demonstrate that tetradecane may function as a potent defense induction signal that prepares neighboring plants for incoming attacks. © 2021 Society of Chemical Industry.
许多食草动物诱导的挥发物已被证明可作为信号化合物，调节附近植物的防御反应。然而，在 Holotrichia parallela 幼虫取食后，玉米根系产生的关键挥发物的确切作用在很大程度上仍不清楚。
我们研究了 Holotrichia parallela 幼虫取食后玉米根系中植物激素和挥发物的变化。食草动物诱导了植物激素茉莉酸（JA）和挥发物茉莉酮和十四烷的显著增加，而水杨酸含量下降。此外，十四烷的预先暴露显著增加了应激激素 JA、其前体和衍生物以及相关基因表达的水平。此外，预先暴露改变了防御性苯并恶嗪类次生代谢物的产生，导致植物对 Holotrichia parallela 幼虫的抗性增强。用茉莉酮预处理的植物与对照植物没有区别。此外，生物测定表明，用十四烷预处理后，取食玉米根系可抑制 Holotrichia parallela 幼虫的生长。
这些结果表明，十四烷可能作为一种有效的防御诱导信号，为邻近植物迎接即将到来的攻击做好准备。 © 2021 化学工业协会。
