Seeds remain in a dormant state as long as environmental conditions are not ideal for germination. The depth of this sleep is inherited from their mother. Researchers reveal how this maternal imprint is transmitted through fragments of 'interfering' RNAs, which inactivate genes, and that a similar mechanism enables to transmit another imprint, that of the temperatures present during the development of the seed. This mechanism allows the seed to optimize the timing of its germination.
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