Diurnal fluctuation of light and dark CO_2 fixation in peeled and unpeeled leaves of Bryophyllum daigremontiana
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Diurnal fluctuation of light and dark CO_2 fixation in peeled and unpeeled leaves of Bryophyllum daigremontiana was examined. A distinct difference in light CO_2 fixation was observed in unpeeled leaves but not in peeled ones. No measurable difference in dark CO_2 fixation was observed in either type. These results indicate that the leaves of CAM plants have a high capacity for CO_2 fixation in the daytime, but it is suppressed by the closing of the stomata. Also, the rapid depression of CO_2 uptake when the illumination was directed at on dark acidified leaves could be prevented by peeling off the epidermis. The net photosynthetic CO_2 uptake in peeled leaves was 77 μmoles/mg chllrophyll/hr in the 3rd leaf and 62 in the 4th leaf.
- 日本植物生理学会の論文
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関連論文
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