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Light period of Crassulacean Acid Metabolism: Control of carbon transfer from malic acid to carbohydrates by CO 2 concentration
Author(s) -
Fischer A.,
Kluge M.
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb04274.x
Subject(s) - malic acid , crassulacean acid metabolism , photosynthesis , decarboxylation , chemistry , starch , metabolism , malic enzyme , carbon dioxide , botany , carbon fibers , crassulaceae , biochemistry , food science , nuclear chemistry , biology , citric acid , organic chemistry , enzyme , catalysis , dehydrogenase , materials science , composite material , composite number
In the CAM plants, Kalanchoë tubiflora (Harvey) Hasset, Sedum morganianum E. Walth and Sedum rubrotinctum R. T. Clausen, the effects of CO 2 concentrations on the light‐dependent 14 C transfer from the nocturnally synthetized [14C]‐malic acid to starch have been studied. CO 2 concentrations up to 5 × 103 μ1 1–1 did not inhibit this carbon transfer. Higher CO 2 concentrations, however, were increasingly inhibitory. At 104 μl 1–1 CO 2 , the carbon transfer was practically prevented. The malic acid consumption in the light showed the same response to CO 2 concentrations as the [ l4 C]‐transfer. Photosynthesis itself was not inhibited by the CO 2 concentrations applied. It is assumed that, during phase III of CAM, light controls the internal CO 2 concentration via photosynthesis; and that the internal CO2 concentration then controls the rate of malate decarboxylation.