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The Influence of CO 2 on the Metabolism of Rhizome Tissue in Iris pseudacorus
Author(s) -
Bown A.,
Boulter D.,
Coult D. A.
Publication year - 1968
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.1399-3054.1968.tb07250.x
Subject(s) - rhizome , citrate synthase , phosphoenolpyruvate carboxykinase , alanine , phosphoenolpyruvate carboxylase , chemistry , metabolism , biochemistry , amino acid , biology , botany , photosynthesis , enzyme
In vitro experiments showed that concentrations of CO 2 above 6 per cent inhibited succinate oxidation; 30–10 per cent of succinate oxidation may be blocked in the presence of 12 per cent CO 2 . Storage of rhizome cores in CO 2 increased the levels of all the main acids except malic. The amino acids, aspartate, glutamate and alanine, also increased in amounts under these conditions. Cores fix CO 2 probably via the reaction phosphoenolpyruvate to oxaloacetate. Raised CO 2 levels increased the rate of diminution of carbohydrate, but carbon itself was conserved due to a reduction in CO 2 output.