Journal
EMBO JOURNAL
Volume 37, Issue 16, Pages -Publisher
WILEY
DOI: 10.15252/embj.201899134
Keywords
cell differentiation; cell wall acidification; cell wall expansion; cytokinin; root meristem
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Funding
- European Research Council
- FIRB (Futuro in Ricerca)
- Sapienza University
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In multicellular systems, the control of cell size is fundamental in regulating the development and growth of the different organs and of the whole organism. In most systems, major changes in cell size can be observed during differentiation processes where cells change their volume to adapt their shape to their final function. How relevant changes in cell volume are in driving the differentiation program is a long-standing fundamental question in developmental biology. In the Arabidopsis root meristem, characteristic changes in the size of the distal meristematic cells identify cells that initiated the differentiation program. Here, we show that changes in cell size are essential for the initial steps of cell differentiation and that these changes depend on the concomitant activation by the plant hormone cytokinin of the EXPAs proteins and the AHA1 and AHA2 proton pumps. These findings identify a growth module that builds on a synergy between cytokinin-dependent pH modification and wall remodeling to drive differentiation through the mechanical control of cell walls.
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