Abstract
Aptenia cordifolia, a salt-tolerant member of the Aizoaceae, exhibits under saline conditions the characteristic features of crassulacean acid metabolism (CAM). The main CO 2-fixation (82%) occurs during the dark period. The CO 2-uptake in the dark is accompanied by a drastic accumulation of malate. These properties are not found in plants cultivated in absence of NaCl. Treated plants show an activity of phosphoenolpyruvate (PEP)-carboxylase of 11.4 ΔA ·min −1 ·g −1 fresh weight whereas untreated plants show only 1.7 ΔA ·min −1 ·g −1 fresh weight.
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