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ANAC005 is a membrane-associated transcription factor and regulates vascular development in Arabidopsis

Journal of Integrative Plant Biology 2016年第5期58卷 442-451页

作者： Jun Zhao Jiang-Shu Liu Fu-Ning Meng Zhen-Zhen Zhang Hao Long Wen-Hui Lin Xiao-Min Luo Zhi-Yong Wang Sheng-Wei Zhu Key Laboratory of Plant Molecular Physiology Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China Institute of Molecular Cell Biology College of Life ScienceHebei Normal UniversityShijiazhuang 050016China School of Life Sciences and Biotechnology Shanghai Jiao Tong UniversityStanfordCalifornia 94305USA Department of Plant Biology Carnegie Institution for ScienceShanghai 200240China

Vascular tissues are very important for providing both mechanical strength and long-distance transport. The molecular mechanisms of regulation of vascular tissue develop- ment are still not fully understood. In this study we identified anacoo5 as a membrane-associated NAC family transcription factor that regulates vascular tissue development. Reporter gene assays showed that anacoo5 was expressed mainly in the vascular tissues, increased expression of anacoo5 protein in transgenic Arabidopsis caused dwarf phenotype, reduced xylem differentiation, decreased lignin content, repression of a lignin biosynthetic gene and genes related to cambium and primary wall, but activation of genes related to the secondary wall. Expression of a dominant repressor fusion of anacoo5 had overall the opposite effects on vascular tissue differ- entiation and lignin synthetic gene expression. The anacoo5- GFP fusion protein was localized at the plasma membrane, whereas deletion of the last 20 amino acids, which are mostly basic, caused its nuclear localization. These results indicate that anacoo5 is a cell membrane-associated transcription factor that inhibits xylem tissue development in Arabidopsis.

关键词： anacoo5 Arabidopsis NAC vascular tissues development

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