Effect of leaf age on light and dark 14CO2 fixation in a CAM plant, Bryophyllum calycinum
- 1 September 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant and Cell Physiology
- Vol. 19 (6) , 935-941
- https://doi.org/10.1093/oxfordjournals.pcp.a075683
Abstract
Leaves of different ages from B. calycinum were exposed to 14CO2 in light during day and night. The labelling pattern on the chromatogram differed with leaf age. Young leaves had similar patterns to those of C3 plants during both day and night. Mature leaves showed high incorporation of 14C into C4 acids, especially at night. In contrast, no significant difference with leaf age was observed in the pattern of dark 14CO2 fixation products. Study of the enzyme activity and the content of titratable acid at each leaf age suggested that high incorporation of 14C in C4 acids during the night was due to the simultaneous absorption of CO2 by both enzymes RuDPcarboxylase and PEPcarboxylase.Keywords
This publication has 2 references indexed in Scilit:
- Carbon isotope composition of biochemical fractions isolated from leaves of Bryophyllum daigremontianum berger, a plant with crassulacean acid metabolism: Some physiological aspects related to CO2 dark fixationPlanta, 1977
- COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARISPlant Physiology, 1949