J Integr Plant Biol ›› 2022, Vol. 64 ›› Issue (4): 859-870.DOI: 10.1111/jipb.13237  cstr: 32098.14.jipb.13237

所属专题： Root development

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  • 收稿日期:2021-10-20 接受日期:2022-02-21 出版日期:2022-04-01 发布日期:2022-04-20

Symplastic communication in the root cap directs auxin distribution to modulate root development

Meng Li1, Mengxue Wang1, Qingyun Lin1, Mengyao Wang1, Xufang Niu1, Jie Cheng2, Meizhi Xu1, Yaxin Qin1, Xinyi Liao2, Jian Xu3 and Shuang Wu1,2*   

  1. 1 College of Life Sciences, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    2 College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    3 The Department of Plant Systems Physiology, Radboud University, Nijmegen 6500, The Netherlands

    * Correspondence: Shuang Wu (wus@fafu.edu.cn)
  • Received:2021-10-20 Accepted:2022-02-21 Online:2022-04-01 Published:2022-04-20

Abstract:

Root cap not only protects root meristem, but also detects and transduces the signals of environmental changes to affect root development. The symplastic communication is an important way for plants to transduce signals to coordinate the development and physiology in response to the changing enviroments. However, it is unclear how the symplastic communication between root cap cells affects root growth. Here we exploit an inducible system to specifically block the symplastic communication in the root cap. Transient blockage of plasmodesmata (PD) in differentiated collumella cells severely impairs the root development in Arabidopsis, in particular in the stem cell niche and the proximal meristem. The neighboring stem cell niche is the region that is most sensitive to the disrupted symplastic communication and responds rapidly via the alteration of auxin distribution. In the later stage, the cell division in proximal meristem is inhibited, presumably due to the reduced auxin level in the root cap. Our results reveal the essential role of the differentiated collumella cells in the root cap mediated signaling system that directs root development.

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