Steroid hormone effects on growth and apical dominance of sunflower |
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| Authors: | B. Bhattacharya K. Gupta |
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| Affiliation: | Department of Botany, Burdwan University, Burdwan, India |
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| Abstract: | External application of estradiol-17β increased shoot growth but decreased root growth of sunflower seedlings. It completely inhibited cotyledonary axillary bud development in decapitated plants at the concentration of 1 μg/plant. Concentrations lower than this promoted cotyledonary axillary bud formation. Testosterone on the other hand inhibited both shoot and root growth and promoted cotyledonary axillary bud formation at all the concentrations used. Progesterone at high (0.25,μg/plant) concentration promoted shoot growth but inhibited root growth. A low concentration (0.1 μg/plant) of progesterone produced the opposite effect. |
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| Keywords: | Compositae steroid hormones root growth shoot growth apical dominance estradiol-17β progesterone testosterone. |
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