Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 69, Issue 18, Pages 4433-4442Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ery223
Keywords
Brassinosteroids (BRs); jasmonic acid (JA); Nilaparvata lugens (BPH); Oryza sativa (rice); salicylic acid (SA)
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Funding
- National Key Research Program [2016YFD0100600]
- NSFC [31522039, 31471470]
- Natural Science Foundation of Jiangsu Province of China [BK20150026]
- National Key Transformation Program [2014ZX08001-001]
- Fundamental Research Funds for the Central Universities [KJYQ201602]
- Key Laboratory of Biology, Genetics and Breeding of Japonica Rice in Mid-lower Yangtze River, Ministry of Agriculture, P.R. China
- Jiangsu Collaborative Innovation Center for Modern Crop Production
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Improved knowledge of the interactions between plants and insects will facilitate better insect control in crops. Brassinosteroids (BRs) play a vital role in plant growth, developmental processes, and responses to pathogen infection, but the role of BRs in interactions between plants and insects remain largely unknown. In this study, we characterized a negative role of BRs in rice defense against brown planthopper (BPH, Nilaparvata lugens) and examined its underlying mechanisms. We found that BPH infestation suppressed the BR pathway while successively activating the salicylic acid (SA) and jasmonic acid (JA) pathways. In addition, BR-overproducing mutants and plants treated with 24-epibrassinolide (BL) showed increased susceptibility to BPH, whereas BR-deficient mutants were more resistant than the wild-type. BRs down-regulated the expression of genes related to the SA pathway and reduced SA content while genes related to the JA pathway were up-regulated and JA content increased after BPH infestation. Furthermore, BR-mediated suppression of the SA pathway was impaired both in JA-deficient and JA-insensitive mutants. Our results demonstrate that BRs promote the susceptibility of rice plants to BPH by modulating the SA and JA pathways.
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