TwoMADS-boxgenes regulate vascularcambium activity and secondary growth by modulating auxin homeostasis in Populus  

作　　者：Shuai Zheng Jiajia He Zengshun Lin Yingying Zhu Jiayan Sun Laigeng Li 

机构地区：[1]National Key Laboratory of Plant Molecular Genetics and CAS Center for Excellence in Molecular Plant Sciences,Institute of Plant Physiology and Ecology,Chinese Academy of Sciences,Shanghai 200032,China [2]University of the Chinese Academy of Sciences,Beijing 100049,China [3]Hunan Agricultural University,Hunan 4101287,China [4]Lanzhou University,Lanzhou,730000,China

出　　处：《Plant Communications》2021年第5期120-131,共12页植物通讯（英文）

基　　金：supported by the Ministry of Science and Technology of the People’s Republic of China(2016YFD0600104);the National Natural Science Foundation of China(31630014);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB27020104).

摘　　要：In trees,stem secondary growth depends on vascular cambium proliferation activity and subsequent cell differentiation,in which an auxin concentration gradient across the cambium area plays a crucial role in regulating the process.However,the underlying molecular mechanismfor the establishment of auxin concentration is not fully understood.In this study,we identified two function-unknown MADS-box genes,VCM1 and VCM2,which are expressed specifically in the vascular cambium and modulate the subcellular homeostasis of auxin.Simultaneous knockdown of both VCM1 and VCM2 enhanced vascular cambium proliferation activity and subsequent xylem differentiation.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.This study reveals 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.

关 键 词：vascular cambium secondary growth AUXIN XYLEM TREE 

分 类 号：Q945.3[生物学—植物学]