Abstract
Two mechanisms of dormancy were found in peach cultivar GF305, which is frequently used for indexing fruit viruses. Seed coat dormancy manifested itself in inhibition of germination, and embryo dormancy was expressed in reduced growth of germinated plants. The seed coat dormancy was overcome by removal of the seed coat or by stratification for 2 weeks at 7°C followed by removal of the endocarp. Embryo dormancy was overcome by stratification periods around 12 weeks. No effect of the seed coat on embryo dormancy was observed.
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