Brassinosteroid regulation of wood formation in poplar

First author: Juan Du; Affiliations: Zhejiang University (浙江大学): Hangzhou, China

Corresponding author: Andrew T. Groover

Brassinosteroids have been implicated in the differentiation of vascular cell types in herbaceous plants, but their roles during secondary growth and wood formation are not well defined. Here we pharmacologically and genetically manipulated brassinosteroid levels in poplar trees and assayed the effects on secondary growth and wood formation, and on gene expression within stems. Elevated brassinosteroid levels resulted in increases in secondary growth and tension wood formation, while inhibition of brassinosteroid synthesis resulted in decreased growth and secondary vascular differentiation. Analysis of gene expression showed that brassinosteroid action is positively associated with genes involved in cell differentiation and cell wall biosynthesis. The results presented here show that brassinosteroids play a foundational role in the regulation of secondary growth and wood formation, in part through the regulation of cell differentiation and secondary cell wall biosynthesis.

有研究显示油菜素内酯作用于草本植物维管细胞类型的分化，但其在植物次生生长和木材形成中的作用还不清楚。本文中，作者通过药理学或者遗传学调控杨树茎杆中的油菜素内酯水平，研究其对于次生生长和木材形成的影响，以及对于基因表达的影响。油菜素内酯水平的升高导致次生生长和应拉木形成的增加，而油菜素内酯合成的抑制则导致生长和次生维管分化的减少。对于基因表达的分析显示油菜素内酯的作用与细胞分化和细胞壁生物合成相关基因的表达相关。本文的研究结果显示了油菜素内酯可通过调控细胞分化和次生细胞壁的合成作用于植物的次生生长和木材形成。

通讯：Andrew T. Groover（https://www.fs.fed.us/psw/programs/cb/staff/agroover/）

研究简介：林木木材形成的分子调控机制。

doi: https://doi.org/10.1111/nph.15936

Journal: New Phytologist

First Published: May 23, 2019