Effect of leaf age on light and dark ^<14>CO_2 fixation in a CAM plant, Bryophyllum calycinum
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Leaves of different ages from B. calycinum were exposed to ^<14>CO_2 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 ^<14>C into C4 acids, especially at night. In contrast, no significant difference with leaf age was observed in the pattern of dark ^<14>CO_2 fixation products. Study of the enzyme activity and the content of titratable acid at each leaf age suggested that high incorporation of ^<14>C in C4 acids during the night was due to the simultaneous absorption of CO_2 by both enzymes RuDPcarboxylase and PEPcarboxylase.
- 日本植物生理学会の論文
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