甜蜜的相遇—营养与激素信号协同调节植物生长的新机制

doi:10.11983/CBB21040

植物学报 ›› 2021, Vol. 56 ›› Issue (2): 138-141.DOI: 10.11983/CBB21040

甜蜜的相遇—营养与激素信号协同调节植物生长的新机制

温兴¹^,², 晋莲¹^,², 郭红卫¹^,²^,^*()

¹南方科技大学植物与食品研究所, 广东省普通高校植物细胞工厂分子设计重点实验室, 深圳 518055
²南方科技大学生命科学学院, 深圳 518055

收稿日期:2021-02-24 接受日期:2021-02-26 出版日期:2021-03-01 发布日期:2021-03-17
通讯作者: 郭红卫
作者简介:^*E-mail: guohw@sustech.edu.cn
基金资助:
国家自然科学基金(31970308);国家自然科学基金重大研究计划(91740203)

A Sweet Meet—New Mechanism on Nutrient and Hormone Regulation of Plant Growth

Xing Wen¹^,², Lian Jin¹^,², Hongwei Guo¹^,²^,^*()

¹Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Institute of Plant and Food Science, Southern University of Science and Technology, Shenzhen 518055, China
²School of Life Scien- ces, Southern University of Science and Technology, Shenzhen 518055, China

Received:2021-02-24 Accepted:2021-02-26 Online:2021-03-01 Published:2021-03-17
Contact: Hongwei Guo

摘要/Abstract

摘要： 为应对持续不断的环境压力和逆境胁迫, 植物需要整合内部和外部信息来调整自身的生长发育, 以适应环境。其中, 可溶性糖不仅是基础能量和营养代谢的必需分子, 也是参与植物生长发育和应对胁迫的信号分子。然而, 植物整合糖信号, 平衡营养代谢和胁迫应答的分子机制尚不清楚。最近, 福建农林大学熊延团队发现, 居于植物营养感受通路中心地位的TOR激酶能够直接磷酸化乙烯信号核心组分EIN2蛋白, 形成1个葡萄糖-TOR-EIN2的营养感受和调控轴心。植物通过不同的蛋白激酶(TOR和CTR1)精确调控EIN2不同位点的磷酸化, 从而使EIN2成为葡萄糖信号和乙烯信号的交叉中心, 精巧地调节植物的生长发育。

关键词: 葡萄糖, 乙烯, TOR, EIN2, 磷酸化

Abstract: Continuously exposed to a variety of environmental stresses, plants need to integrate internal and external information in order to achieve the purpose of adaption to environment. Among this process the perception and regulation of the energy state and soluble sugar level are of great importance. However, the molecular mechanisms underlying the integration of sugar signaling, nutrient metabolism and stress response in plants remain unclear. Recently, a team led by Prof. Yan Xiong from Fujian Agriculture and Forestry University (FAFU) have discovered that TOR kinase, the central player in metabolic signaling pathways, can directly bind and phosphorylate the core component of ethylene signaling EIN2 protein, forming a regulatory axis to coordinate TOR and ethylene signaling. The two kinases TOR and CTR1 precisely regulates distinct phosphorylation sites on EIN2, respectively, which makes EIN2 become a coordination hub of glucose signal and ethylene signal, and precisely control plant growth and development.

Key words: glucose, ethylene, TOR, EIN2, phosphorylation

温兴, 晋莲, 郭红卫. 甜蜜的相遇—营养与激素信号协同调节植物生长的新机制. 植物学报, 2021, 56(2): 138-141.

Xing Wen, Lian Jin, Hongwei Guo. A Sweet Meet—New Mechanism on Nutrient and Hormone Regulation of Plant Growth. Chinese Bulletin of Botany, 2021, 56(2): 138-141.

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链接本文: https://www.chinbullbotany.com/CN/10.11983/CBB21040

https://www.chinbullbotany.com/CN/Y2021/V56/I2/138

图/表 1

图1 营养与乙烯信号协同调节植物生长的机制在营养丰富或未进行乙烯处理时, 蛋白激酶CTR1和TOR均能直接与EIN2发生相互作用, 分别对多个氨基酸进行磷酸化修饰。当采用乙烯处理时, 受体失活, CTR1被抑制, EIN2第645和924位丝氨酸(S645和S924)磷酸化水平下调, 导致EIN2的C端被切割, 一部分入核, 另一部分在细胞质中促进P-body的形成, 最终稳定转录因子EIN3/EIL1, 激活下游基因表达(Li et al. 2015; Hao et al. 2017)。当营养缺乏时, TOR受到抑制, EIN2第657位苏氨酸(T657)磷酸化水平下降, 导致EIN2全长蛋白进入细胞核。如果发生在黑暗中, 会造成EIN3/EIL1蛋白水平上调, 激活下游ERF基因表达, 抑制下胚轴伸长; 如果发生在光下, 会造成E2Fa基因下调, 最终抑制根分生组织细胞的增殖。实线代表已建立直接互作, 虚线代表可能间接互作或尚待研究, 箭头代表促进作用, T型箭头代表抑制作用。

Figure 1 The mechanism of coordinated regulation of plant growth by nutrition and ethylene signaling Protein kinases CTR1 and TOR can interact and phosphorylate EIN2, respectively, in nutrition-rich medium or ethylene- free environment. When treated with ethylene, inactivation of the receptors leads to the suppression of CTR1 and the phosphorylation levels at two serine residues (S645 and S924) of EIN2 are decreased. EIN2 is therefore cleaved and the C terminus translocates into the nucleus and/or forms P-body in the cytoplasm. Consequently, the master transcription factors EIN3/EIL1 are stabilized and the downstream gene expression is activated (Li et al. 2015; Hao et al. 2017). When nutrition deficiency occurs, TOR is inhibited and the phosphorylation level of a threonine (T657) of EIN2 is decreased, followed by the nuclear shuttling of the full-length EIN2 protein. If it occurs in darkness, EIN3/EIL1 proteins would be promoted, thus to activate the expression of downstream ERF genes and to inhibit hypocotyl elongation. Alternatively, if in light, E2Fa gene expression would be down- regulated, thus to inhibit root meristem cell proliferation. Unbroken lines indicate established interactions, broken lines indicate indirect or hypothetical interactions, arrows indicate stimulatory interactions, bar-headed lines indicate inhibitory interactions.

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甜蜜的相遇—营养与激素信号协同调节植物生长的新机制

A Sweet Meet—New Mechanism on Nutrient and Hormone Regulation of Plant Growth

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