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

Bender, Margaret M. ; Rouhani, I. ; Vines, H. M. ; Black, C. C.

Plant physiology (Bethesda), 1973-11, Vol.52 (5), p.427-430 [Periódico revisado por pares]

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13C/12C Ratio Changes in Crassulacean Acid Metabolism Plants 1
Autor: Bender, Margaret M. ; Rouhani, I. ; Vines, H. M. ; Black, C. C.
É parte de: Plant physiology (Bethesda), 1973-11, Vol.52 (5), p.427-430
Notas: This research was supported in part by National Science Foundation Grant GB-20661 and GA-10651X.
Present address: University of Pahlavi, Iran.
Descrição: 13 C/ 12 C ratios have been found in totally combusted leaves of Crassulacean acid metabolism plants to range from −14 to −33 δ 13 C‰ compared with a limestone standard. Crassulacean acid metabolism plants apparently utilize both ribulose-1, 5-diphosphate carboxylase and phosphoenolpyruvate carboxylase to assimilate atmospheric CO 2 and, depending on environmental conditions, have 13 C/ 12 C ratios indicative of either carboxylase or to any intermediate value. The degree of discrimination against 13 C and the resultant 13 C/ 12 C ratio from the photosynthetically fixed CO 2 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 δ 13 C‰ in specific environments.
Idioma: Inglês

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