In Arabidopsis, the final size of the seed is determined early on during its development by the growth of a single multinucleate cell, the coenocytic endosperm. The endosperm arises from a second fertilization event, alongside the embryo, and dominates the onset of seed development while later nourishing and supporting embryo growth.
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The authors declare no competing interests.
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Xu, W., Magnani, E. An actin starry night regulates seed size. Nat. Plants 9, 201–202 (2023). https://doi.org/10.1038/s41477-023-01341-z