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- W4386225353 abstract "Abstract In multicellular organisms, localized tissue outgrowth creates a new water sink thereby modifying hydraulic patterns at the organ level. These fluxes are often considered passive by-products of development and their patterning and potential contribution to morphogenesis remains largely unexplored. Here, we generated a complete map of cell volumetric growth and deformation across the shoot apex in Arabidopsis thaliana . Within the organ-meristem boundary, we found that a subpopulation of cells next to fast-growing cells experiences volumetric shrinkage. To understand this process, we used a vertex-based model integrating mechanics and hydraulics, informed by the measured growth rates. Organ outgrowth simulations revealed the emerging water fluxes and predicted water deficit with volume loss for a few cells at the boundary. Consistently, in planta, a water-soluble dye is preferentially allocated to fast-growing tissues and fails to enter the boundary domain. Analysis of intact meristems further validated our model by revealing cell shrinkage next to fast-growing cells in different contexts of tissue surface curvature and cell deformation. A molecular signature of water deficit at the boundary further confirmed our conclusion. Taken together, we propose a model where the differential sink strength of emerging organs prescribes the hydraulic patterns that define the boundary domain at the shoot apex." @default.
- W4386225353 created "2023-08-29" @default.
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- W4386225353 date "2023-08-28" @default.
- W4386225353 modified "2023-10-18" @default.
- W4386225353 title "Water fluxes contribute to growth patterning in shoot meristems" @default.
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- W4386225353 doi "https://doi.org/10.1101/2023.08.27.554993" @default.
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