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KMID : 0903619930340030221
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Journal of the Korean Society for Horticultural Science
1993 Volume.34 No. 3 p.221 ~ p.229
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Effects of Temperature , Light , and Water Stress on Flower Bud Formation in Camellia vernalis
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Abstract
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The influence of temperature and photoperiod, and ethylene on flower bud formation in Camellia vernalis ´Omigoromo´ was determined. Two-year-old pot plants were grown at various temperatures (15℃, 20℃, 25℃, or 30℃) under natural light in a phytotron for five months (May-Sept.), and at 25℃ under 8 hr and 16 hr lighting. Cuttings were also held at the same temperatures under continuous lighting.
Flower bud formation occurred effectively at all temperatures except at 15℃, and it did more rapidly at higher temperatures. But there were no significant differences among high temperature treatments in the rate of flower bud formation. Long day treatment (16 hr) slightly increased the number of flower buds formed. Thirty days of dark treatment at 25℃ eliminated the potential for flower bud formation.
Water-stressed cuttings of C. vernalis formed flower buds in leaf axils where vegetative buds are normally formed under natural conditions. Detached leaves of C. vernalis emanated ethylene at markedly higher rates when placed under water stress at dry condition than when placed in water saturated air. Ethylene application to non-water-stressed cuttings promoted flower bud formation. It is suggested that abnormal formation of flower buds in water-stressed cuttings might be due to endogenous ethylene induced by water stress.
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