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Articles

¹³C/¹²C Ratio Changes in Crassulacean Acid Metabolism Plants ¹

I. Rouhani^b,2, H. M. Vines^b and C. C. Black, Jr.^b

^a Center for Climatic Research, University of Wisconsin, Madison, Wisconsin 53706, Department of Horticulture and Department of Biochemistry, University of Georgia, Athens, Georgia 30602

¹³C/¹²C ratios have been found in totally combusted leaves of Crassulacean acid metabolism plants to range from –14 to –33 ¹³C compared with a limestone standard. Crassulacean acid metabolism plants apparently utilize both ribulose-1, 5-diphosphate carboxylase and phosphoenolpyruvate carboxylase to assimilate atmospheric CO₂ and, depending on environmental conditions, have ¹³C/¹²C ratios indicative of either carboxylase or to any intermediate value. The degree of discrimination against ¹³C and the resultant ¹³C/¹²C ratio from the photosynthetically fixed CO₂ is influenced by environmental conditions and is not a specific and fixed characteristic of a Crassulacean acid metabolism plant. Certain Crassulacean acid metabolism plants may shift their ratios as much as 17 ¹³C in specific environments.

¹ This research was supported in part by National Science Foundation Grant GB-20661 and GA-10651X.

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