Two MADS-box genes regulate vascular cambium activity and secondary growth via modulating auxin homeostasis in Populus

第一作者：Shuai Zheng

第一单位：中科院植物生理生态研究所

通讯作者：Laigeng Li

 Abstract 

背景回顾：In trees, stem secondary growth depends on vascular cambium proliferation activity and subsequent cell differentiation, in which a gradient of auxin concentration cross the cambium area plays a crucial role in regulating the process.

提出问题：However, the underlying molecular mechanism for establishment of the auxin concentration is not fully understood.

主要发现：In this study, we identified two function-unknown MADS-box genes, VCM1 and VCM2, which are expressed specifically in the vascular cambium and modulated the subcellular homeostasis of auxin.

结果1-敲低：Simultaneous knock-down of both VCM1 and VCM2 enhanced vascular cambium proliferation activity and subsequent xylem differentiation.

结果2-过表达：Overexpression of VCM1 suppressed vascular cambium activity and wood formation by regulating PIN5 expression which tuned the soluble auxin concentration in the vascular cambium area.

结论：The study uncovers the role of VCM1 and VCM2 in regulating the proliferation activity of the vascular cambium and secondary growth by modulating the subcellular auxin homeostasis in Populus.

 通讯作者 

doi: 10.1016/j.xplc.2020.100134

Journal: Plant Communications

Published date: Nov 22, 2020