Water fluxes pattern growth and identity in shoot meristems

In multicellular organisms, tissue outgrowth creates a new water sink, modifying local hydraulic patterns. Although water fluxes are often considered passive by-products of development, their contribution to morphogenesis remains largely unexplored. Here, we mapped cell volumetric growth across the...

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Published inNature communications Vol. 15; no. 1; pp. 6944 - 14
Main Authors Alonso-Serra, Juan, Cheddadi, Ibrahim, Kiss, Annamaria, Cerutti, Guillaume, Lang, Marianne, Dieudonné, Sana, Lionnet, Claire, Godin, Christophe, Hamant, Olivier
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 13.08.2024
Nature Publishing Group UK
Nature Portfolio
Subjects
Arabidopsis - growth & development
Arabidopsis - metabolism
Atrophy
Biological Physics
Botanics
Development Biology
Fluid flow
Fluxes
Growth conditions
Hydraulics
Life Sciences
Meristem - growth & development
Meristem - metabolism
Meristems
Morphogenesis
Organs
Physics
Plant cells
Plant Shoots - growth & development
Plant Shoots - metabolism
Shoots
Vegetal Biology
Volumetric analysis
Water - metabolism
Water deficit
Water flow
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Summary:In multicellular organisms, tissue outgrowth creates a new water sink, modifying local hydraulic patterns. Although water fluxes are often considered passive by-products of development, their contribution to morphogenesis remains largely unexplored. Here, we mapped cell volumetric growth across the shoot apex in Arabidopsis thaliana. We found that, as organs grow, a subpopulation of cells at the organ-meristem boundary shrinks. Growth simulations using a model that integrates hydraulics and mechanics revealed water fluxes and predicted a water deficit for boundary cells. In planta, a water-soluble dye preferentially allocated to fast-growing tissues and failed to enter the boundary domain. Cell shrinkage next to fast-growing domains was also robust to different growth conditions and different topographies. Finally, a molecular signature of water deficit at the boundary confirmed our conclusion. Taken together, we propose that the differential sink strength of emerging organs prescribes the hydraulic patterns that define boundary domains at the shoot apex.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-51099-x