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Herbivore‐induced rice resistance against rice blast mediated by salicylic acid
Author(s) -
Zhang KaiLi,
Liu QingSong,
Kang HouXiang,
Liu XiaoMei,
Chen XiuPing,
Peng YuFa,
Li YunHe
Publication year - 2020
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/1744-7917.12630
Subject(s) - chilo suppressalis , cnaphalocrocis medinalis , biology , salicylic acid , infestation , jasmonic acid , herbivore , oryza sativa , insect , rice plant , botany , resistance (ecology) , agronomy , larva , lepidoptera genitalia , gene , biochemistry
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 of rice 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 pre‐infestation 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.