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The amounts of abscisic acid (ABA) in different parts of the seed have been investigated during dry storage, which induces dormancy. ABA occurs within the embryonic axis as well as in testa and cotyledon. The amount of ABA in the whole seed markedly declines during dry storage, although there is a transient increase within the embryonic axis. The incorporation of 32PO43‐ into poly(A)‐rich RNA within the axis declines during dry storage. Imbibition results in increased poly(A) RNA synthesis but the presence of the testa is inhibitory to this synthesis. GA3 on the other hand promotes synthesis. Poly(A) RNA synthesis within isolated embryonic axes is inhibited by ABA. These results are discussed with respect to the induction, maintenance and breaking of dormancy.
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Jarvis et al. (1981) studied this question.
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