Abstract
Thermodormancy of celery seeds incubated in the dark at 22°C was alleviated by two N-substituted phthalimides to the same extent as that normally achieved with a mixture of the gibberellins A 4 and A 7. As previously demonstrated with GA 4+7, the highly dormant cultivar ‘Lathom Blanching’ responded more to phthalimides in the presence of cytokinin, whereas ‘Florida 683’ required no cytokinin to elicit the maximum response to phthalimide treatment. Seed-soak treatments with either N-substituted phthalimide improved both the rate of germination and the percentage seedling emergence of both cultivars sown in compost under glasshouse conditions.
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