Relationship between embryo dormancy induction and abscisic acid level in 'Campbell Early' grape [Vitis] seed during berry maturation
1999
Liu, J.S. (Osaka Prefectural Univ., Sakai (Japan). Coll. of Agriculture) | Horiuchi, S. | Ogata, T. | Shiozaki, S. | Mochioka, R.
The relationship between embryo dormancy induction and ABA level in 'Campbell Early' grape seed during berry maturation was investigated. In vitro germination and rooting percentages of embryos excised from seeds were high one week before veraison; both gradually declined to zero 2 weeks after veraison. The ABA contents in the flesh and the seed increased as the germination and rooting percentages of embryos decreased. Stem ringing and spraying the cluster with 10 ppm 2, 4-D three weeks before veraison had little influence on embryo germination, rooting and ABA content in the seed. The germination and rooting of embryos excised from seeds 10 days before veraison and incubated on agar medium, decreased with increasing ABA concentration; both processes were suppressed entirely in embryos incubated on agar medium containing 20 ppm ABA. These results indicate that ABA is a potent endogenous factor which induces embryo dormancy in grape seed
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