数字农科院2.0

A Cotton Nac Domain Transcription Factor, Ghfsn5, Negatively Regulates Secondary Cell Wall Biosynthesis And Anther Development In Transgenic Arabidopsis

文献类型： 外文期刊

作者： Yang, Mingming;Guo, Yifan;Sun, Qianwen;Huang, Junfeng;Xu, Wenliang;Zhang, Jie;Xu, Wenliang;Guo, Yanjun;Zhang, Jie;Li, Juan

作者机构：

关键词： Cotton; Ghpsn5; Secondary Cell Wall; Nac Protein; Negative Regulation; Transgenic Arabidopsis

期刊名称： PLANT PHYSIOLOGY AND BIOCHEMISTRY

ISSN： 0981-9428

年卷期： 2020 年 146 卷

页码：

摘要： NAC domain transcription factors (TFs) are plant-specific transcriptional regulators, some of which play crucial roles in secondary cell wall (SCW) biosynthesis in plants. Cotton is one of the most important natural fiber producing crops, whose mature fiber SCW contains more than 90% cellulose with very small amounts of xylan and lignin, but little is known about the molecular mechanism underlying fiber SCW formation. We previously identified seven fiber preferentially expressed NAC members, GhFSN1-7. One, GhFSN1, was demonstrated to positively regulate fiber SCW thickening, but the functions of other GhFSN members remain unknown. In this study, roles of GhFSN5 were dissected. qRT-PCR analysis showed that GhFSN5 was predominantly transcribed during the fiber SCW thickening stage. In addition, a large number of fiber SCW biosynthetic genes and SCW-related TFs were co-expressed with GhFSN5. Heterologous expression of GhFSN5 in Arabidopsis resulted in plants with smaller siliques and severe sterility. Anther dehiscence in transgenic lines was not substantially affected, but most pollen was collapsed and nonviable. Furthermore, cellulose and lignin contents in inflorescence stems as well as roots were reduced in transgenic lines, compared with the wild type. Moreover, a set of SCW biosynthetic genes for cellulose, xylan and lignin and several transcription factors involved in regulation of SCW formation were down-regulated in transgenic plants. Our findings indicate that GhFSN5 acts as a negative regulator of SCW formation and anther development and expands our understanding of transcriptional regulation of SCW biosynthesis.

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