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Olive fruits infested with olive fly larvae respond with an ethylene burst and the emission of specific volatiles

Journal of Integrative Plant Biology 2016年第4期58卷 413-425页

作者： Fiammetta Alagna Mario Kallenbach Andrea Pompa Francesca De Marchis Rosa Rao Ian T.Baldwin gustavo bonaventure Luciana Baldoni CNR-Institute of Biosciences and Bioresources(IBBR) Perugia 06128Italy Department of Molecular Ecology Max Planck Institute of Chemical EcologyJena 07745Germany Department of Agronomy University of Naples"Federico II"80055 PorticiItaly

Olive fly（Bactrocera oleae R.） is the most harmful insect pest of olive（Olea europaea L.） which strongly affects fruits and oil production. Despite the expanding economic importance of olive cultivation, up to now, only limited information on plant responses to B. oleae is available. Here,we demonstrate that olive fruits respond to B. oleae attack by producing changes in an array of different defensive compounds including phytohormones, volatile organic compounds（VOCs）, and defense proteins. Bactrocera oleaeinfested fruits induced a strong ethylene burst and transcript levels of several putative ethylene-responsive transcription factors became significantly upregulated. Moreover, infested fruits induced significant changes in the levels of 12-oxophytodienoic acid and C12 derivatives of the hydroperoxide lyase. The emission of VOCs was also changed quantitatively and qualitatively in insect-damaged fruits, indicating that *** larval feeding can specifically affect the volatile blend offruits. Finally, we show that larval infestation maintained high levels of trypsin protease inhibitors in ripe fruits, probably by affecting post-transcriptional mechanisms. Our results provide novel and important information to understand the response of the olive fruit to B. oleae attack; information that can shed light onto potential new strategies to combat this pest.

关键词： Bactrocera oleae biotic stress Olea europaea phytohormones plant defense volatile organic compounds

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