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科学网—eLife：开花信号和植物激素调控拟南芥成花转变过程中的SAM形态变化

花匠小妙招
2024-11-13 04:33

Regulation of shoot meristem shape by photoperiodic signaling and phytohormones during floral induction of Arabidopsis

第一作者：Atsuko Kinoshita

第一单位：东京都立大学

通讯作者：George Coupland

Abstract

背景回顾：Floral transition, the onset of plant reproduction, involves changes in shape and identity of the shoot apical meristem (SAM).

提出问题：The change in shape, termed doming, occurs early during floral transition when it is induced by environmental cues such as changes in day-length, but how it is regulated at the cellular level is unknown.

主要研究：We defined the morphological and cellular features of the SAM during floral transition of Arabidopsis thaliana.

结果1-形态变化与开花信号：Both cell number and size increased during doming, and these changes were partially controlled by the gene regulatory network (GRN) that triggers flowering.

结果2-赤霉素：Furthermore, dynamic modulation of expression of gibberellin biosynthesis and catabolism enzymes at the SAM contributed to doming. Expression of these enzymes was regulated by two MADS-domain transcription factors implicated in flowering.

结论：We provide a temporal and spatial framework for integrating the flowering GRN with cellular changes at the SAM, and highlight the role of local regulation of gibberellin.

摘要

成花转变是植物进入生殖阶段的起始，涉及到茎尖分生组织形状和本体的改变。SAM形状上的变化叫做doming，发生在日长等环境因素诱导的成花转变的初期，但其在细胞层面的调控机制还不清楚。本文中，作者鉴定了拟南芥成花转变时期SAM在形态和细胞水平上的特征。在doming过程中，细胞数量和大小都有所增加，并且这些改变会受到诱导开花的基因调控网络的控制。此外，在SAM处动态调节赤霉素生物合成和分解代谢相关酶有助于doming。这些酶的表达受到两个与开花相关、含有MADS结构域转录因子的调控。本文中作者提供了一个可以整合开花基因调控网络与SAM细胞层面变化的时空框架，并重点突出了赤霉素在局部调控中的作用。

通讯作者