【摘 要】
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The pea leafminer,Liriomyza huidobrensis,is an important pest species af-fecting ornamental crops worldwide.Plant damage consists of oviposition and feeding punctures created by female adult flies as well as larva-bored mines in leaf mesophyll tissues.How
【机 构】
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State Key Laboratory of Integrated Management of Pest Insects and Rodents,Institute of Zoology,Chine
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The pea leafminer,Liriomyza huidobrensis,is an important pest species af-fecting ornamental crops worldwide.Plant damage consists of oviposition and feeding punctures created by female adult flies as well as larva-bored mines in leaf mesophyll tissues.How plants indirectly defend themselves from these two types of leafminer dam-age has not been sufficiently investigated.In this study,we compared the indirect defense responses of bean plants infested by either female adults or larvae.Puncturing of leaves by adults released green leaf volatiles and terpenoids,while larval feeding caused plants to additionally emit methyl salicylate and(E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene(TMTT).Puncturing of plants by female adults induced increases in jasmonic acid(JA)and JA-related gene expressions but reduced the expressions of salicylic acid(SA)-related genes.In contrast,JA and SA and their-related gene expression levels were increased sig-nificantly by larval feeding.The exogenous application of JA+SA significantly triggered TMTT emission,thereby significantly inducing the orientation behavior of parasitoids.Our study has confirmed that larval feeding can trigger TMTT emission through the ac-tivation of both JA and SA pathways to attract parasitoids;however,TMTT alone is less attractive than the complete blend of volatiles released by infested plants.
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