期刊
DEVELOPMENTAL CELL
卷 24, 期 2, 页码 125-132出版社
CELL PRESS
DOI: 10.1016/j.devcel.2012.12.009
关键词
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资金
- EMBO
- Gottfried Wilhelm Leibniz Award of the DFG
- Max Planck Society
- US National Science Foundation [IOS-0820610, IOS-1022102]
- DFG [SFB592]
- ERA-PG Plant Stem Cell Network
- AFGN
- Excellence Initiative of the German Federal and State Governments (BIOSS)
- EU-INTER-REG IV Upper Rhine program
- German Federal Ministry of Education and Research (FRISYS)
A long-standing question in plants and animals is how spatial patterns are maintained within stem cell niches despite ongoing cell divisions. Here we address how, during shoot meristem formation in Arabidopsis thaliana, the three apical cell layers acquire stem cell identity. Using a sensitized mutant screen, we identified miR394 as a mobile signal produced by the surface cell layer (the protoderm) that confers stem cell competence to the distal meristem by repressing the F box protein LEAF CURLING RESPONSIVENESS. This repression is required to potentiate signaling from underneath the stem cells by the transcription factor WUSCHEL, maintaining stem cell pluripotency. The interaction of two opposing signaling centers provides a mechanistic framework of how stem cells are localized at the tip of the meristem. Although the constituent cells change, the surface layer provides a stable point of reference in the self-organizing meristem.
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