Journal
DEVELOPMENT
Volume 143, Issue 18, Pages 3295-3299Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.137190
Keywords
Biophysics; Endosperm; Pressure; Seed; Turgor
Categories
Funding
- AgreenSkills (CESETAB project)
- Institut National de la Recherche Agronomique
- 'Chaire d'excellence' from l'Agence Nationale de la Recherche, France [ANR-10-CHEX-0011]
- European Research Council Starting Grant [307387]
- Agence Nationale de la Recherche (ANR) [ANR-10-CHEX-0011] Funding Source: Agence Nationale de la Recherche (ANR)
- European Research Council (ERC) [307387] Funding Source: European Research Council (ERC)
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In Arabidopsis, rapid expansion of the coenocytic endosperm after fertilisation has been proposed to drive early seed growth, which is in turn constrained by the seed coat. This hypothesis implies physical heterogeneity between the endosperm and seed coat compartments during early seed development, which to date has not been demonstrated. Here, we combine tissue indentation with modelling to show that the physical properties of the developing seed are consistent with the hypothesis that elevated endosperm-derived turgor pressure drives early seed expansion. We provide evidence that whole-seed turgor is generated by the endosperm at early developmental stages. Furthermore, we show that endosperm cellularisation and seed growth arrest are associated with a drop in endosperm turgor pressure. Finally, we demonstrate that this decrease is perturbed when the function of POLYCOMB REPRESSIVE COMPLEX 2 is lost, suggesting that turgor pressure changes could be a target of genomic imprinting. Our results indicate a developmental role for changes in endosperm turgor pressure in the Arabidopsis seed.
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