Carbon Isotope Ratios of Epidermal and Mesophyll Tissues from Leaves of C3 and CAM Plants |
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Authors: | Nishida, Kojiro Roksandic, Zarko Osmond, Barry |
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Affiliation: | 1Botanical Institute, Faculty of Science, Kanazawa University Kanazawa 920, Japan 2Department of Environmental Biology, Research School of Biological Sciences, Australian National University PO Box 475, Canberra City, ACT, 2601, Australia |
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Abstract: | The 13C values for epidermal and mesophyll tissues of two C3plants, Commelina communis and Tulipa gesneriana, and a CAMplant, Kalancho daigremontiana, were measured. The values forthe tissues of both C3 plants were similar. In young leavesof Kalancho, the epidermis and the mesophyll showed S13C valueswhich were nearly identical, and similar to those found in C3plants. However, markedly more negative values for epidermalcompared to mesophyll tissue, were obtained in the mature Kalancholeaf. This is consistent with the facts that the epidermis ina CAM leaf is formed when leaves engage in C3 photosynthesisand that subsequent dark CO2 fixation in guard cells or mesophyllcells makes only a small contribution to total epidermal carbon. (Received January 27, 1981; Accepted May 14, 1981) |
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