The Dynamics of Cambial Stem Cell Activity

First author: Urs Fischer; Affiliations: Swedish University of Agricultural Sciences (瑞典农业科学大学): Umea, Sweden

Corresponding author: Rishikesh P. Bhalerao

Stem cell populations in meristematic tissues at distinct locations in the plant body provide the potency of continuous plant growth. Primary meristems, at the apices of the plant body, contribute mainly to the elongation of the main plant axes, whereas secondary meristems in lateral positions are responsible for the thickening of these axes. The stem cells of the vascular cambium—a secondary lateral meristem—produce the secondary phloem (bast) and secondary xylem (wood). The sites of primary and secondary growth are spatially separated, and mobile signals are expected to coordinate growth rates between apical and lateral stem cell populations. Although the underlying mechanisms have not yet been uncovered, it seems likely that hormones, peptides, and mechanical cues orchestrate primary and secondary growth. In this review, we highlight the current knowledge and recent discoveries of how cambial stem cell activity is regulated with foci on mobile signals and the response of cambial activity to environmental and stress factors.

在植物中，分布在不同部位的分生组织中的干细胞为植物的持续生长提供了可能。初生分生组织在植物的顶端，主要作用于植物整体植株的增高，而处于植物茎秆四周的次生分生组织则作用于植物的增粗。维管形成层中的干细胞会向内分化形成次生木质部，向外分化形成次生韧皮部。植物的初生生长和次生生长在空间上是隔离的，所以肯定存在某种可移动的信号来协调顶端干细胞和维管形成层的生长速率。尽管，目前相关的分子机制还不是很清楚，但现有的研究显示植物激素、多肽以及一些机械信号能够协调植物的初生和次生生长。本文中，作者综述了近来对于形成层干细胞活性调控分子机制的最新研究进展，主要关注了可能的移动信号，以及形成层干细胞对于环境和胁迫因素的响应。

通讯：Rishikesh P. Bhalerao  (https://www.upsc.se/researchers/4622-seasonal-control-of-growth-in-perennial-plants-and-regulation-of-cell-elongation-rishikesh-p-bhalerao.html#key-publications)

个人简介：1985年，印度那浦尔大学，学士；1987年，印度那浦尔大学，硕士；1993年，于默奥大学，博士。

研究方向：多年生植物生长的季节性调控以及细胞伸长的调控机制。

doi: https://doi.org/10.1146/annurev-arplant-050718-100402

Journal: Annual Review of Plant Biology

Published date: April 09, 2019