Abstract
The incorporation of 32PO 4 3− into poly(A) +RNA in the cotyledon of hazel ( Corylus avellana L.) seeds is low and declines during dry storage. Imbibition results in increased poly(A) +RNA synthesis. Gibberellic acid (GA 3), cotyledon excision and testa removal (dormancy breaking) promote synthesis. The pattern of the stimulation of poly(A) +RNA synthesis by GA 3 in cotyledons differs from the pattern in axes. Poly(A) +RNA from dormant cotyledons is polydisperse with a peak maximum of 15.1 S, larger than that from dormant axes. Dormancy breaking treatments do not increase the size of the poly(A) +RNA synthesised in cotyledons, as they do in axes. These results support the suggestion that there are independent sites of action of gibberellin in the axis and in the cotyledon of hazel seeds. The poly(A) lengths in dormant and non-dormant cotyledons are similar and 32P is incorporated into both the poly(A) and the rest of the molecule. The results are discussed with respect to food mobilization, the hormonal interaction of axis and cotyledon and the breaking of dormancy.
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