DELLA-NAC Interactions Mediate GA Signaling to Promote Secondary Cell Wall Formation in Cotton Stem

Gibberellins (GAs) promote secondary cell wall (SCW) development in plants, but the underlying molecular mechanism is still to be elucidated. Here, we employed a new system, the first internode of cotton, and the virus-induced gene silencing method to address this problem. We found that knocking dow...

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Bibliographic Details
Published in:Frontiers in plant science 2021-07, Vol.12, p.655127-655127
Main Authors: Wang, Yi, Yu, Wanting, Ran, Lingfang, Chen, Zhong, Wang, Chuannan, Dou, Yang, Qin, Yuanyuan, Suo, Qingwei, Li, Yaohua, Zeng, Jianyan, Liang, Aimin, Dai, Yonglu, Wu, Yiping, Ouyang, Xufen, Xiao, Yuehua
Format: Article
Language:English
Subjects:
cotton stem
DELLA proteins
gibberellin
NAC proteins
Plant Science
secondary cell wall formation
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Summary:Gibberellins (GAs) promote secondary cell wall (SCW) development in plants, but the underlying molecular mechanism is still to be elucidated. Here, we employed a new system, the first internode of cotton, and the virus-induced gene silencing method to address this problem. We found that knocking down major DELLA genes via VIGS phenocopied GA treatment and significantly enhanced SCW formation in the xylem and phloem of cotton stems. Cotton DELLA proteins were found to interact with a wide range of SCW-related NAC proteins, and virus-induced gene silencing of these NAC genes inhibited SCW development with downregulated biosynthesis and deposition of lignin. The findings indicated a framework for the GA regulation of SCW formation; that is, the interactions between DELLA and NAC proteins mediated GA signaling to regulate SCW formation in cotton stems.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2021.655127