A signal cascade originated from epidermis defines apical-basal patterning of Arabidopsis shoot apical meristems

Han Han, An Yan, Lihong Li, Yingfang Zhu, Bill Feng, Xing Liu and Yun Zhou ()
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Han Han: Purdue University
An Yan: California Institute of Technology
Lihong Li: Purdue University
Yingfang Zhu: Henan University
Bill Feng: California Institute of Technology
Xing Liu: Purdue University
Yun Zhou: Purdue University

Nature Communications, 2020, vol. 11, issue 1, 1-17

Abstract: Abstract In multicellular organisms, a long-standing question is how spatial patterns of distinct cell types are initiated and maintained during continuous cell division and proliferation. Along the vertical axis of plant shoot apical meristems (SAMs), stem cells are located at the top while cells specifying the stem cells are located more basally, forming a robust apical-basal pattern. We previously found that in Arabidopsis SAMs, the HAIRY MERISTEM (HAM) family transcription factors form a concentration gradient from the epidermis to the interior cell layers, and this gradient is essential for the stem cell specification and the apical-basal patterning of the SAMs. Here, we uncover that epidermis specific transcription factors, ARABIDOPSIS THALIANA MERISTEM LAYER 1 (ATML1) and its close homolog, define the concentration gradient of HAM in the SAM through activating a group of microRNAs. This study provides a molecular framework linking the epidermis-derived signal to the stem cell homeostasis in plants.

Date: 2020
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DOI: 10.1038/s41467-020-14989-4

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