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KMID : 0903619910320030382
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Journal of the Korean Society for Horticultural Science
1991 Volume.32 No. 3 p.382 ~ p.387
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Effects of Light Intensity on Growth , Flower Differentiation , and Flowering of Rhododendron Species
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Abstract
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This study was conducted to determine the effects of light intensity on the growth, flower differentiation, and flowering of Rododendron mucronulatum Turcz, and Rhododendron yedoense var. poukhanense for. albiflora Chang. Shoot growth was stimulated at the plants grown in shade. But the optimum light intensity for the growth of Rhododendron mucronulatum was higher than that of Rhododendron yedoense var. poukhanense for. albiflora. The number of leaves and stem diameter increased at the plants grown in the optimum light intensity. The number of shoots of Rhododendron yedoense var, poukhanezase for. albiflora increased in the optimum light intensity, while that of Rhododendron mucronulatum was not affected by light intensity. Flower differentiation of both species was accelerated in high light intensity, and delayed in the optimum light intensity. Light saturation point and respiration rate became lower at the plants grown in low light intensity, and light saturation point of Rhododendron mucronulatum was higher than that of Rhododendron yedoense var. poukhanense for. albiflora. More GA-like substances were detected from the plants grown in the optimum light intensity. The number of flowers per shoot increased at the plants grown in the optimum light intensity. Flower diameter of Rhododendron yedoense var. poukhanense for. albiflora increased in the optimum light intensity, while there was no difference in Rhododenaron mucronulatum.
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