Diurnal Rhythm and Characteristics of Photosynthesis and Respiration in the Leaf and Root of a Phalaenopsis Plant |
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Authors: | Endo, Muneo Ikusima, Isao |
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Affiliation: | 1Chiba Prefectural Agricultural Experimental Station Daizenno-cho 808, Chiba, 280-02 Japan 2Institute of Marine Ecosystems, Faculty of Science, Chiba University Yayoi-cho 33-1, Chiba, 260 Japan |
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Abstract: | A hybrid Phalaenopsis plant was grown hydroponically on a nutrientsolution of Hyponex in the greenhouse. Typical daily patternsof CO2 fixation, production of malic acid and citric acid andpH of the leaf and root were determined. The rate of primaryfixation of CO2 in the leaf increased markedly in the evening,remained high until well into the afternoon, then decreasedsharply. The pattern of production of organic acids resultedfrom the fact that the rate of uptake of CO2 gas was highestat night and fell during the day. A high correlation betweenpH value and level of malic acid in the leaves was observed,and an exponential relationship appeared to exist between theseparameters. These rhythmic sequences were not observed in theroot. The results suggest that metabolism in the leaf had characteristicsof CAM (Crassulacean Acid Metabolism), while the root did not. (Received May 6, 1988; Accepted October 25, 1988) |
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