CAM Photosynthesis under Drought Conditions in Kalanchoe blossfeldiana Grown with Nitrate or Ammonium as the Sole Nitrogen Source

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概要

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• K. blossfeldiana Poelln. cv. Hikan was grown in vermiculite, supplied daily with nutrient solution containing 1 mM (or 10 mM) nitrate or ammonium as the sole nitrogen source. The nitrate-grown plants had more activity of CAM (Crassulacean acid metabolism) photosynthesis (nocturnal CO_2 uptake in the shoot and nocturnal increases of titratable acidity and malate con-tent in the leaves) than the ammonium-grown plants. Interruption of the solution supply for 5 or more days (drought conditions) increased the activity of CAM photosynthesis in nitrate- or am-monium-grown plants, and the diurnal CO_2 uptake pattern in the nitrate-grown plants shifted from 'weak-CAM' to 'full-CAM'. The difference in the activity of CAM photosynthesis between nitrate- and ammonium-grown plants increased under the drought conditions. When the solution was resupplied, the activity of CAM photosynthesis rapidly decreased to the levels before the interruption. The physiological mechanism and ecological significance of the effect of the nitrogen source on CAM photosynthesis are discussed.

• 日本植物生理学会の論文

著者

• Ota Koichi

  Department Of Agronomy School Of Agriculture Nagoya University

• Ota Koichi

  Department Of Agronomy Faculty Of Agriculture Nagoya University

関連論文

• Comparison of Aquatic Organisms Communities between Paddy Fields under Rice-Duck (Aigamo) Farming and Paddy Fields under Conventional Farming(Soil Biology)
• CAM Photosynthesis under Drought Conditions in Kalanchoe blossfeldiana Grown with Nitrate or Ammonium as the Sole Nitrogen Source
• Changes in Crassulacean Acid Metabolism of Kalanchoe blossfeldiana by Different Nitrogen Sources

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