55.緑葉揮発成分によるシロイヌナズナのメチルジャスモン酸感受性の増強(口頭発表)

概要

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Green leaf volatiles (GLVs) are C6 and C9 aldehydes, alcohols, and their esters which are produced after pathogen and insect attacks in higher plants. It is known that GLVs play important roles in plant defense response. One of the functions of GLVs is known as 'priming'. By priming, plants prepare to respond more rapidly and effectively to the expected pathogen/insect attacks. Defense responses in primed plants are activated by much lower concentrations of defense-inducing signals than those required in non-primed plants. In this study, we focused on the priming effects by GLVs on jasmonic acid (JA) signaling involved in the defense responses. Arabidopsis thaliana (Columbia ecotype) were primed by GLVs and then exposed to methyl jasmonate (MeJA). Finally, anthocyanin contents were measured as an index of the JA response. The result shows that some GLVs enhance the sensitivity to MeJA of A. thaliana in a dose-dependent manner. The plants which were exposed to trans-2-hexenal produced the highest amount of anthocyanin by the following MeJA treatment. On the other hand, no priming effect was observed for the plants exposed to cis-3-hexenol. These results suggest that specific GLVs can enhance the sensitivity to MeJA of A. thaliana.
2010-10-01