NAC1 regulates root ground tissue maturation by coordinating with the SCR/SHR-CYCD6;1 module in Arabidopsis
NAC1 regulates root ground tissue maturation by coordinating with the SCR/SHR-CYCD6;1 module in Arabidopsis
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DOI：
10.1016/j.molp.2023.02.006
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发表时间：
2023
期刊：
影响因子：
27.5
通讯作者：
Ding Zhaojun
中科院分区：
文献类型：
--
作者：
Xie Chuantian;Li Cuiling;Wang Fengxia;Zhang Feng;Liu Jiajia;Wang Junxia;Zhang Xiansheng;Kong Xiangpei;Ding Zhaojun
Precise spatiotemporal control of the timing and extent of asymmetric cell divisions (ACDs) is essential for plant development. In the Arabidopsis root, ground tissuematuration involves an additional ACD of the endodermis that maintains the inner cell layer as the endodermis and generates the middle cortex to the outside. Through regulation of the cell cycle regulator CYCLIND6;1 (CYCD6;1), the transcription factors SCARECROW (SCR) and SHORT-ROOT (SHR) play critical roles in this process. In the present study, we found that loss of function of NAC1, a NAC transcription factor family gene, causesmarkedly increased periclinal cell divisions in the root endodermis. Importantly, NAC1 directly represses the transcription of CYCD6;1 by recruiting the co-repressor TOPLESS (TPL), creating a fine-tuned mechanism to maintain proper root ground tissue patterning by limiting production of middle cortex cells. Biochemical and genetic analyses further showed that NAC1 physically interacts with SCR and SHR to restrict excessive periclinal cell divisions in the endodermis during root middle cortex formation. Although NAC1-TPL is recruited to the CYCD6;1 promoter and represses its transcription in an SCR-dependentmanner, NAC1 and SHR antagonize each other to regulate the expression of CYCD6;1. Collectively, our study providesmechanistic insights into howthe NAC1-TPL module integrates with the master transcriptional regulators SCR and SHR to control root ground tissue patterning by fine-tuning spatiotemporal expression of CYCD6;1 in Arabidopsis.
