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KMID : 0903619980390050593
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 5 p.593 ~ p.596
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Effect of Photosynthetic Photon Flux and Temperature on Photosynthesis and Respiration in One - year - old Orchids
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Abstract
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Five different kinds of one-year-old orchids were employed for the measurement of photosynthesis and respiration rate as affected by photosynthetic photon flux (PPF) and temperature. Photosynthesis rate in Cymbidium ´Water King´ attained maximum at 25 % and increased by elevating PPF from 25 to 125 μ㏖m^(-2)s^(-1), but decreased sharply at above 30℃ without regard to level of PPF. Respiration was observed under dark condition or even at level of 12 μ㏖m^(-2)s^(-1) PPF and increased by elevating temperature. Photosynthesis in Dendrobium kin~ianum was favored within the range of 63 to 125 μ㏖m^(-2)s^(-1) PPF and 10 to 15 % condition. However, respiration markedly increased at above 15℃. Nobile type Dendrobium ´Permos Glory´ exhibited maximum photosynthesis with an increasing PPF at 25℃, but sharply decreased at 30℃. Catttleya ´Spring Mount´ revealed that photsynthesis was higher under 20℃ and 12 to 25 μ㏖m^(-2)s^(-1) PPF condition, but similar photsynthetic rate was obtained at level of above 63 μ㏖m^(-2)s^(-1) PPF at the range of 15 to 25℃. Photosynthesis was sharply decreased while respiration was occurred at above 30℃ without regard to PPR Photosynthetic rate in Phalaenopsis ´Lipstick´ showed similar tendency as in Cattleya only except that photosynthesis was observed at 30℃ under the level of above 25μ㏖m^(-2)s^(-1) PPF. On the other hand, respiration was only observed at 35℃ irrespective of PPF level.
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