Reduction of abscisic acid levels or inhibition of abscisic acid signaling in rice during the early phase of Magnaporthe oryzae infection decreases its susceptibility to the fungus

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• 作者：Katsumi Yazawa^a ; Chang-Jie Jiang^a ; Mikiko Kojima^b ; Hitoshi Sakakibara^b ; Hiroshi Takatsuji^a ; ^{takatsuh@affrc.go.jp}
• 关键词：Rice ; Magnaporthe oryzae ; Blast disease ; ABA ; ABA8ox ; ABI
• 刊名：Physiological and Molecular Plant Pathology
• 出版年：2012
• 期刊代码：183_08855765
• 类别：bio
• 出版时间：April, 2012
• 卷：78
• 期：Complete
• 页码：1-7
• 文件大小：982 K

摘要

Exogenous application of abscisic acid (ABA) compromises rice resistance to Magnaporthe oryzae. Here, we analyzed the influence of ABA level/signaling on defense responses of rice plants during the early phase of M.聽oryzae infection. Decreased ABA levels or inhibition of ABA signaling by expressing OsABA8ox1 or OsABI(G-to-A) genes before, but not after, M.聽oryzae inoculation decreased lesion numbers. Microscopic observation showed increased fungal invasion into the cells of rice transformants, accompanied by enhanced autofluorescence accumulation and decreased callose formation. These results indicate that ABA promotes M.聽oryzae infection of rice during early stages of infection.