PagDET2 promotes cambium cell division and xylem differentiation in poplar stem

被引:7
|
作者
Wang, Yao [1 ]
Hao, Yi [1 ]
Guo, Yakun [2 ]
Shou, Huixia [1 ]
Du, Juan [1 ]
机构
[1] Zhejiang Univ, Coll Life Sci, State Key Lab Plant Physiol & Biochem, Hangzhou, Peoples R China
[2] Zhejiang Agr & Forestry Univ, Sch Forestry & Biotechnol, State Key Lab Subtrop Silviculture, Hangzhou, Peoples R China
来源
FRONTIERS IN PLANT SCIENCE | 2022年 / 13卷
基金
中国国家自然科学基金; 美国国家科学基金会;
关键词
biomass; castasterone; DEETIOLATED2; vascular cambium; xylem differentiation; poplar; WOOD FORMATION; GIBBERELLIN BIOSYNTHESIS; BIOMASS PRODUCTION; GROWTH; ETHYLENE; AUXIN; BRASSINOSTEROIDS; TRANSCRIPTOME; EXPRESSION; CYTOKININ;
D O I
10.3389/fpls.2022.923530
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Secondary growth of the woody tree stem is governed by meristematic cell division and differentiation in the vascular cambium. Multiple hormonal signals and endogenous developmental programs regulate vascular cambium activity. Brassinosteroids (BRs) significantly promote secondary stem growth and wood formation in poplar trees. However, the underlying regulatory mechanisms of BRs within the vascular tissue remain unclear. Genetic and anatomical approaches were used here to elucidate the role of PagDET2, the rate-limiting enzyme for BRs biosynthesis, in regulating secondary vascular cambium activity in Populus. This study showed that the elevated endogenous castasterone (CS) levels in tree stems through overexpressing PagDET2 could enhance cambium meristem cell activity and xylem (XY) differentiation to promote secondary stem growth. RNA-seq analysis revealed that genes involved in BRs response, vascular cambium cell division, XY differentiation, and secondary cell wall synthesis were up-regulated.
引用
收藏
页数:12
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