Journal
JOURNAL OF INTEGRATIVE PLANT BIOLOGY
Volume 64, Issue 4, Pages 859-870Publisher
WILEY
DOI: 10.1111/jipb.13237
Keywords
auxin; root cap; root development; stem cell niche; symplastic communication
Categories
Funding
- National Key Research and Development Program of China [2018YFD1000800]
- National Natural Science Foundation of China [31900169]
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Root cap not only protects the root meristem, but also transduces signals of environmental changes to affect root development. This study reveals the essential role of differentiated collumella cells in the symplastic communication system between root cap cells, which directs root development, particularly in the stem cell niche and proximal meristem of Arabidopsis.
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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