Plant Physiology 87:454-457 (1988)
© 1988 American Society of Plant Biologists
Environmental and Stress Physiology
Stimulation of CAM Photosynthesis in Kalanchoë blossfeldiana by Transferring to Nitrogen-Deficient Conditions
Koichi Ota
Department of Agronomy, School of Agriculture, Nagoya University, Chikusa-ku, Nagoya 464, Japan
Kalanchoë blossfeldiana Poelln. cv Hikan plants were grown hydroponically with nutrient solution containing 5 millimolar NO3 (or NH4+) for 1 to 2 months and then transferred to nutrient solution containing no nitrogen. CO2 uptake at night, nocturnal increase in titratable acidity, and activity of phosphoenolpyruvate carboxylase increased after the transfer. Thus, transfer to nitrogen-deficient conditions stimulates Crassulacean acid metabolism (CAM photosynthesis) in K. blossfeldiana. The importance of the plant nitrogen status (nitrogen-withdrawal status) for induction and stimulation of CAM photosynthesis is discussed.
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