GhMYB30-GhMUR3 affects fiber elongation and secondary wall thickening in cotton

被引：7

作者：

Wu, Aimin ^{[1
,2
]}

Lian, Boying ^{[2
]}

Hao, Pengbo ^{[2
]}

Fu, Xiaokang ^{[2
]}

Zhang, Meng ^{[2
]}

Lu, Jianhua ^{[2
]}

Ma, Liang ^{[2
]}

Yu, Shuxun ^{[1
,2
]}

Wei, Hengling ^{[2
]}

Wang, Hantao ^{[2
,3
]}

机构：

[1] Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430000, Hubei, Peoples R China

[2] Chinese Acad Agr Sci, Inst Cotton Res, Natl Key Lab Cotton Biobreeding & Integrated Utili, Anyang 455000, Henan, Peoples R China

[3] Chinese Acad Agr Sci, Western Agr Res Ctr, Changji 831100, Xinjiang, Peoples R China

来源：

PLANT JOURNAL | 2024年 / 117卷 / 03期

关键词：

upland cotton; GhMUR3; fiber elongation; secondary wall thickening; GhMYB30; TRANSCRIPTION-FACTOR; DIRECT TARGET; POSITIVE REGULATOR; BIOSYNTHESIS; XYLOGLUCAN; GENE; ACTIVATION; EXPRESSION; MYB46; GALACTOSYLTRANSFERASE;

D O I：

10.1111/tpj.16523

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Xyloglucan, an important hemicellulose, plays a crucial role in maintaining cell wall structure and cell elongation. However, the effects of xyloglucan on cotton fiber development are not well understood. GhMUR3 encodes a xyloglucan galactosyltransferase that is essential for xyloglucan synthesis and is highly expressed during fiber elongation. In this study, we report that GhMUR3 participates in cotton fiber development under the regulation of GhMYB30. Overexpression GhMUR3 affects the fiber elongation and cell wall thickening. Transcriptome showed that the expression of genes involved in secondary cell wall synthesis was prematurely activated in OE-MUR3 lines. In addition, GhMYB30 was identified as a key regulator of GhMUR3 by Y1H, Dual-Luc, and electrophoretic mobility shift assay (EMSA) assays. GhMYB30 directly bound the GhMUR3 promoter and activated GhMUR3 expression. Furthermore, DAP-seq of GhMYB30 was performed to identify its target genes in the whole genome. The results showed that many target genes were associated with fiber development, including cell wall synthesis-related genes, BR-related genes, reactive oxygen species pathway genes, and VLCFA synthesis genes. It was demonstrated that GhMYB30 may regulate fiber development through multiple pathways. Additionally, GhMYB46 was confirmed to be a target gene of GhMYB30 by EMSA, and GhMYB46 was significantly increased in GhMYB30-silenced lines, indicating that GhMYB30 inhibited GhMYB46 expression. Overall, these results revealed that GhMUR3 under the regulation of GhMYB30 and plays an essential role in cotton fiber elongation and secondary wall thickening. Additionally, GhMYB30 plays an important role in the regulation of fiber development and regulates fiber secondary wall synthesis by inhibiting the expression of GhMYB46.

引用

页码：694 / 712

页数：19

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