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KMID : 0380119800030000031
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Korean Journal of Ecology
1980 Volume.3 No. 0 p.31 ~ p.39
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Limitation of Light Energy Utilization in the Fallen Stems of Opunttia bigelovii without CO_2 and Water Absorption
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Chang Nam-Kee
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Abstract
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Light energy utilization was investigated in the fallen stems of Opuntia bigelovii. Threshold time for the decreasing steady state of acid accumulation in the palisade tissue of Opuntia stems was 4 hours under 1,000μEm^-2sec^-1 of PAR at 27℃, while stomatal closing throughout the stem stage was illustrated by 256.0-310.4 sec cm^-1 of stem diffusive resistance and 0.20g day^-1 of the water loss rate as cuticular resistance. The acid loss rate in the stems per 4 hours was related to tissue water contents and a few acid loss rate could be recognized at the water content rage of 56.4∼46.8%. Endogenous oscillation of tissue acidity due to the diurnal rhythmic phenomena depended on the tissue water content was found in the Opuntia stems with stomatal closing during the normal day/night cycle. The survival rate of 1 segment stems to survive 2 years old cactus was 22.7% in desert environments. Such a compensation photosynthesis which utilizes light energy and maintains the reassimilation of endogenous gases was interpreted as conceptual model.
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KEYWORD
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