《植物生理学报》 2021, 57(3): 551-557

植物根正负向光性生长及其与向重力性生长的相互关系研究

缪百灵¹，焦书升²，赵翔^1,*

¹河南大学生命科学学院, 作物逆境适应与改良国家重点实验室, 河南开封475004；²开封市蔬菜科学研究所, 河南开封475003

通信作者：赵翔；E-mail: xzhao@henu.edu.cn

摘　要：

向光性和向重力性在植物根系生长中起着重要作用。向光素PHOT1通过诱导植物根尖生长素的不对称分布调节其负向光性生长, 而光敏色素PHYA既可调节红光诱导的植物根的正向光性也可感知蓝光参与调控根的负向光性。根向重力性的调节主要是通过淀粉粒来感知重力刺激, 进而引起生长素在根尖的不对称分布实现。本文综述了光诱导植物根的正负向光性生长机制及其与根向重力性机制之间的可能调控关系, 旨在为揭示这两者之间的联系提供参考。

关键词：向光性; 向重力性; 生长素; 蓝光; 红光

收稿：2020-08-28   修定：2021-01-02

资助：国家自然科学基金(31871419、 31670289和31570294)

Mechanism of positive and negative phototropism in plant roots and its relationship with gravitropism

MIAO Bailing¹, JIAO Shusheng², ZHAO Xiang^1,*

¹State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, Henan 475004, China; ²Kaifeng Institute of Vegetable Science, Kaifeng, Henan 475003, China

Corresponding author: ZHAO Xiang; E-mail: xzhao@henu.edu.cn

Abstract:

Phototropism and gravitropism play important roles in plant root growth. Phototropin 1 (PHOT1) regulates the negative phototropism of roots by inducing the asymmetric distribution of auxin in root tips, while phytochrome A (PHYA) mediates the positive phototropism of roots induced by red light, and also senses that blue light is involved in regulating the negative phototropism of roots. The regulation of root gravitropism is mainly realized by starch grains sensing gravity stimulation, which leads to the asymmetric distribution of auxin in root tips. In this article, we review the signaling for phototropism of root, focus on the relationship between positive and negative phototropic growth, and discuss the crosstalk with phototropism and gravitropism of plant roots. The purpose is to provide a reference for revealing the regulatory relationship between phototropic growth and gravitational growth.

Key words: phototropism; gravitropism; auxin; blue light; red light