seed dormancy is regulated by
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Induction and release of seed dormancy is mainly under the control of abscisic acid (ABA) and gibberellic acid (GA). ABA promotes seed dormancy and germination inhibition. Action of ABA is counteracted by GA, which promotes seed germination at appropriate time.
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In seed coat dormancy , the seed prevents oxygen and/or water permeating into the seed. sometimes, dormancy is caused by inhibiting chemicals inside the seed . .... physiology conditions causing internal dormancy arise from the presence of germination inhabitors inside the seed
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