Germination of Tagetes minuta L. II. Role of gibberellins |
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Authors: | F E Drewes J Van Staden |
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Institution: | (1) UN/FRD Research Unit for Plant Growth and Development, University of Natal, P.O. Box 375, 3200 Pietermaritzburg, Republic of South Africa |
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Abstract: | The effect of the application of gibberellins to Tagetes minuta L. achenes (seeds) was determined at both 25°C, the optimal germination temperature, and 35°C, at which temperature the achenes are thermoinhibited. Both GA3 and GA4+7 accelerated germination at 25°C. Seed germination at 25°C was inhibited by paclobutrazol, but on subsequent application of GA4+7 rapid germination was induced. Following application of GA3 or GA4+7 to thermoinhibited seeds, a significantly higher final germination percentage was observed than in the distilled water control. However, endogenous gibberellin levels in germinating and thermoinhibited seeds did not differ significantly. |
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Keywords: | Tagetes minuta seed germination gibberellins |
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