78.イネのファイトアレキシン生産におけるジャスモン酸類の役割(口頭発表)

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In this study, we investigated roles of JA in phytoalexin production using the JA-biosynthetic rice mutant cpm2 or the JA-Ile-biosynthetic rice mutant jar1. First we examined phytoalexin production in CuCl_2-treated mutant leaves. The production of the diterpenoid phytoalexins in cpm2 was comparable to that in a wild-type. On the other hand, the production of sakuranetin, a flavonoid phytoalexin, was suppressed in cpm2, and the suppression was restored by the addition of JA. Next, we examined phytoalexin production in Magnaphorthe oryzae infected leaf sheaths. Upon M. oryzae infection production of both diterpenoid phytoalexins and sakuranetin was severely suppressed in cpm2. These data suggest that, under CuCl_2 treatment, JA is essential for the production of sakuranetin, but not for diterpenoid phytoalexins. On the other hand, upon M. oryzae infection, JA is essential for production of both diterpenoid phytoalexins and sakuranetin. We also analyzed phenotypes of rice jar1 mutant defective in JA-Ile production to extend understanding of roles of jasmonates in phytoalexin production. We examined phytoalexin production by JA or JA-Ile treatment in jar1 leaves. Production of both diterpenoid phytoalexins and sakuranetin by JA treatment was suppressed in jar1. On the other hand, production of these phytoalexins by JA-Ile treatment in jarl was comparable to that in wild type. These data suggest that JA-Ile was essential for JA-induced phytoalexin production in rice.
2009-10-06

78.イネのファイトアレキシン生産におけるジャスモン酸類の役割(口頭発表)

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