Herbivore-induced rice resistance against rice blast mediated by salicylic acid

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: induced defense jasmonic acid plant-insect-pathogen interaction rice salicylic acid
• 年，卷（期）: 2020,（1）
• 页码范围: 49-57
• 页数: 9页
• 语种: 英文
• DOI: 10.1111/1744-7917.12630

摘要

In agro-ecosystems,plants are important mediators of interactions between their associated herbivorous insects and microbes,and any change in plants induced by one species may lead to cascading effects on interactions with other species.Often,such effects are regulated by phytohormones such as jasmonic acid (JA) and salicylic acid (SA).Here,we investigated the tripartite interactions among rice plants,three insect herbivores (Chilo suppressalis,Cnaphalocrocis medinalis or Nilaparvata lugens),and the causal agent ofrice blast disease,the fungus Magnaporthe oryzae.We found that pre-infestation of rice by C.suppressalis or N.lugens but not by C.medinalis conferred resistance to M.oryzae.For C.suppressalis and N.lugens,insect infestation without fungal inoculation induced the accumulation of both JA and SA in rice leaves.In contrast,infestation by C.medinalis increased JA levels but reduced SA levels.The exogenous application of SA but not of JA conferred resistance against M.oryzae.These results suggest that preinfestation by C.suppressalis or N.lugens conferred resistance against M.oryzae by increasing SA accumulation.These findings enhance our understanding of the interactions among rice plant,insects and pathogens,and provide valuable information for developing an ecologically sound strategy for controlling rice blast.