期刊
PEST MANAGEMENT SCIENCE
卷 78, 期 2, 页码 550-560出版社
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.6660
关键词
Holotrichia parallela larvae; defense induction; tetradecane; jasmone; jasmonic acid; benzoxazinoids
资金
- Jilin University [JLUXKJC2020107]
- National Key R&D Program of China [2017YFD0200600, 2018YFD0201000]
After Holotrichia parallela larva feeding, maize roots produced changes in phytohormones and volatiles, with tetradecane potentially serving as a potent defense induction signal that increases plant resistance to the larvae.
BACKGROUND 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. RESULTS 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. CONCLUSION These results demonstrate that tetradecane may function as a potent defense induction signal that prepares neighboring plants for incoming attacks.
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