Causal signals for seed initiation have been sought ever since double fertilization was discovered in 1898. New research reveals that auxin is an early driver of endosperm proliferation in Arabidopsis central cells, with or without fertilization.
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Koltunow, A., Rabiger, D. Development: Turning on endosperm in seeds. Nature Plants 1, 15189 (2015). https://doi.org/10.1038/nplants.2015.189
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DOI: https://doi.org/10.1038/nplants.2015.189