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Effect of photosynthetic photon flux and temperature on photosynthesis and respiration in one-year-old orchids


Effect of photosynthetic photon flux and temperature on photosynthesis and respiration in one-year-old orchids



Journal of the Korean Society for Horticultural Science 39(5): 593-596



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 25degreeC and increased by elevating PPF from 25 to 125 mu molm-2s-1, but decreased sharply at above 30degreeC without regard to level of PPF. Respiration was observed under dark condition or even at level of 12 mu molm-2s-1 PPF and increased by elevating temperature. Photosynthesis in Dendrobium kingianum was favored within the range of 63 to 125 mumolm-2s-1 PPF and 10 to 15degreeC condition. However, respiration markedly increased at above 15degreeC. Nobile type Dendrobium 'Permos Glory' exhibited maximum photosynthesis with an increasing PPF at 25degreeC, but sharply decreased at 30degreeC. Catttleya 'Spring Mount' revealed that photsynthesis was higher under 20degreeC and 12 to 25 mumolm-2s-1 PPF condition, but similar photosynthetic rate was obtained at level of above 63 mumolm 2s-1 PPF at the range of 15 to 25degreeC. Photosynthesis was sharply decreased while respiration was occurred at above 30degreeC without regard to PPF. Photosynthetic rate in Phalaenopsis 'Lipstick' showed similar tendency as in Cattleya only except that photosynthesis was observed at 30degreeC under the level of above 25 mumolm-2s-1 PPF. On the other hand, respiration was only observed at 35degreeC irrespective of PPF level.

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