文章基本信息

标题：Xanthomonas translucens commandeers the host rate-limiting step in ABA biosynthesis for disease susceptibility
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作者：Chris Casinghino ; Kathleen Fisher ; Cody Roux 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2019
卷号：116
期号：42
页码：20938-20946
DOI：10.1073/pnas.1911660116
出版社：The National Academy of Sciences of the United States of America
摘要：Plants are vulnerable to disease through pathogen manipulation of phytohormone levels, which otherwise regulate development, abiotic, and biotic responses. Here, we show that the wheat pathogen Xanthomonas translucens pv. undulosa elevates expression of the host gene encoding 9- cis -epoxycarotenoid dioxygenase ( TaNCED-5BS ), which catalyzes the rate-limiting step in the biosynthesis of the phytohormone abscisic acid and a component of a major abiotic stress-response pathway, to promote disease susceptibility. Gene induction is mediated by a type III transcription activator-like effector. The induction of TaNCED-5BS results in elevated abscisic acid levels, reduced host transpiration and water loss, enhanced spread of bacteria in infected leaves, and decreased expression of the central defense gene TaNPR1 . The results represent an appropriation of host physiology by a bacterial virulence effector.
关键词：Xanthomonas ; ABA ; TAL effector ; disease susceptibility ; wheat