Effects of High Night Temperature on Crassulacean Acid Metabolism (CAM) Photosynthesis of Kalanchoe pinnata and Ananas comosus(Crop Physiology and Ecology)
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概要
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The effects of the night temperature on CO_2 exchange rate and organic acid accumulation in the leaves of two crassulacean acid metabolism (CAM) plants, Kalanchoe pinnata and Ananas comosus (pineapple), were examined under a fixed day-temperature condition of 30℃. With the increase of the night temperature, the CO_2 exchange rate decreased in both species, and K. pinnata completely lost nocturnal CO_2 uptake under a high night temperature (30/37℃ in day/night) condition (HNT). Malate accumulation in the leaves of pineapple and K. pinnata in the morning decreased with increasing night temperature, but that in the afternoon was not influenced by the night temperature. Diurnal changes of ten kinds of metabolites were investigated under HNT. Pineapple accumulated a large amount of nocturnal malate under HNT, but K. pinnata did not. Four kinds of hexose-phosphate (hexose-P) were accumulated at the same levels during the day/night cycle under HNT in both plant species. Nocturnal accumulation of oxaloacetate (OAA) was observed but phosphoenolpyruvate (PEP) was kept at a high level both in day and night under HNT in both plant species. The concentrations of malate required for 50% inhibition of the activities of day and night forms of PEP carboxylase (PEPC) from the pineapple leaves were 1.2 and 0.7mM, respectively, whereas those from the K. pinata leaves were 3.7 and 2.0mM, respectively. In both plants, NAD-MDH activity in vitro increased with increasing temperature. It is therefore suggested that under HNT, phosphorylation may not be the major factor controlling PEPC activity in pineapple, and therefore CAM mode in pineapple was maintained under HNT. The nighttime phosphorylation of PEPC in K. pinnata would disappear under HNT leading to the loss of nocturnal malate accumulation.
- 日本作物学会の論文
著者
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KAWAMITSU Yoshinobu
Faculty of Agriculture, University of the Ryukyus
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Kawamitsu Yoshinobu
Faculty Of Agriculture University Of The Ryukyus
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Nose Akihiro
Faculty Of Agricultural Saga University
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Lin Qin
The United Graduate School of Agriculture Science, Kagoshima University
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Abe Syunsuke
Faculty of Agriculture, University of the Ryukyus
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Sunami Akira
Faculty of Agricultural, Saga University
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Lin Qin
The United Graduate School Of Agriculture Science Kagoshima University:faculty Of Agricultural Saga
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Abe Syunsuke
Faculty Of Agriculture University Of The Ryukyus
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Sunami Akira
Faculty Of Agricultural Saga University
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