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HBI1‐TCP20 interaction positively regulates the CEPs‐mediated systemic nitrate acquisition
Journal of Integrative Plant Biology ( IF 9.3 ) Pub Date : 2020-11-19 , DOI: 10.1111/jipb.13035 Xiaoqian Chu 1 , Mingzhe Li 1 , Shujuan Zhang 2 , Min Fan 1 , Chao Han 1 , Fengning Xiang 1 , Genying Li 2 , Yong Wang 3 , Cheng-Bin Xiang 4 , Jia-Gang Wang 1 , Ming-Yi Bai 1
Journal of Integrative Plant Biology ( IF 9.3 ) Pub Date : 2020-11-19 , DOI: 10.1111/jipb.13035 Xiaoqian Chu 1 , Mingzhe Li 1 , Shujuan Zhang 2 , Min Fan 1 , Chao Han 1 , Fengning Xiang 1 , Genying Li 2 , Yong Wang 3 , Cheng-Bin Xiang 4 , Jia-Gang Wang 1 , Ming-Yi Bai 1
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Nitrate is the main source of nitrogen for plants but often distributed heterogeneously in soil. Plants have evolved sophisticated strategies to achieve adequate nitrate by modulating the root system architecture. The nitrate acquisition system is triggered by the short mobile peptides C‐TERMINALLY ENCODED PEPTIDES (CEPs) that are synthesized on the nitrate‐starved roots, but induce the expression of nitrate transporters on the other nitrate‐rich roots through an unclear signal transduction pathway. Here, we demonstrate that the transcription factors HBI1 and TCP20 play important roles in plant growth and development in response to fluctuating nitrate supply. HBI1 physically interacts with TCP20, and this interaction was enhanced by the nitrate starvation. HBI1 and TCP20 directly bind to the promoters of CEPs and cooperatively induce their expression. Mutation in HBIs and/or TCP20 resulted in impaired systemic nitrate acquisition response. Our solid genetic and molecular evidence strongly indicate that the HBI1‐TCP20 module positively regulates the CEPs‐mediated systemic nitrate acquisition.
中文翻译：
HBI1-TCP20 相互作用正调节 CEPs 介导的全身硝酸盐获取
硝酸盐是植物氮的主要来源，但通常在土壤中分布不均匀。植物已经进化出复杂的策略，通过调节根系结构来获得足够的硝酸盐。硝酸盐获取系统由短的移动肽 C-末端编码肽 (CEP) 触发，该肽在缺乏硝酸盐的根上合成，但通过不明确的信号转导途径诱导其他富含硝酸盐的根上硝酸盐转运蛋白的表达。在这里，我们证明转录因子 HBI1 和 TCP20 在响应波动的硝酸盐供应的植物生长和发育中发挥重要作用。HBI1 与 TCP20 发生物理相互作用，这种相互作用因硝酸盐饥饿而增强。HBI1 和 TCP20 直接与CEP的启动子结合并协同诱导它们的表达。HBIs和/或TCP20 的突变导致全身硝酸盐获取反应受损。我们可靠的遗传和分子证据强烈表明 HBI1-TCP20 模块正调节 CEP 介导的全身硝酸盐获取。
更新日期：2020-11-19
中文翻译：
HBI1-TCP20 相互作用正调节 CEPs 介导的全身硝酸盐获取
硝酸盐是植物氮的主要来源，但通常在土壤中分布不均匀。植物已经进化出复杂的策略，通过调节根系结构来获得足够的硝酸盐。硝酸盐获取系统由短的移动肽 C-末端编码肽 (CEP) 触发，该肽在缺乏硝酸盐的根上合成，但通过不明确的信号转导途径诱导其他富含硝酸盐的根上硝酸盐转运蛋白的表达。在这里，我们证明转录因子 HBI1 和 TCP20 在响应波动的硝酸盐供应的植物生长和发育中发挥重要作用。HBI1 与 TCP20 发生物理相互作用，这种相互作用因硝酸盐饥饿而增强。HBI1 和 TCP20 直接与CEP的启动子结合并协同诱导它们的表达。HBIs和/或TCP20 的突变导致全身硝酸盐获取反应受损。我们可靠的遗传和分子证据强烈表明 HBI1-TCP20 模块正调节 CEP 介导的全身硝酸盐获取。
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