Studies of Mechanisms Affecting the Fractionation of Carbon Isotopes in Photosynthesis
The fractionation of carbon isotopes during photosynthesis involves several distinct biochemical and physical processes that share control of CO2 uptake. These processes have different tendencies to discriminate between 12C and 13C, and the overall discrimination of a particular plant will be a function of the mechanism it uses for CO2 fixation and the relative balance of the processes that participate in photosynthesis. Many studies have examined the influence of environmental and biological factors on the carbon isotope composition of plants (for reviews, see O’Leary 1981; Troughton et al. 1974; Vogel 1980). The eventual goal of much of this work is to use the carbon isotope composition of plants to provide information about the photosynthetic processes of the plant during the time it grew. While empirical correlations are useful, it is obviously also important to develop a sound theoretical foundation for interpreting these differences.
Unable to display preview. Download preview PDF.
- Bager MR, Kaplan A, and Berry JA (1978) A mechanism for concentrating CO2 in Chla- mydomonas reinhardtii and Anabaena variabilis and its role in photosynthetic CO2 uptake. Carnegie Inst. Wash. Yearb. 77:251–261.Google Scholar
- Evans JR, Sharkey DT, Berry JA, and Farquhar GD (1986) Carbon isotope discrimination measured concurrently with gas exchange to investigate CO2 diffusion in leaves of higher plants. Aust. J. Plant Physiol. 13:281–292.Google Scholar
- Farquhar GD (1983) On the nature of carbon isotope discrimination in C4 species. Aust. J. Plant Physiol. 10:205–226.Google Scholar
- Farquhar GD, O’Leary MH, and Berry JA (1982) On the relationship between carbon isotope discrimination and intercellular carbon dioxide concentration in leaves. Aust. J. Plant Physiol. 9:121–137.Google Scholar
- Farquhar GD and Richards PA (1984) Isotopic composition of plant carbon correlates with water-use efficiency of wheat genotypes. Aust. J. Plant Physiol. 11:539–552.Google Scholar
- Francey RJ, Gifford RM, Sharkey TD, and Weir B (1985) Physiological influences on carbon isotope discrimination in huon pine Lagarostrobos franklinii). Oecologia 44:241–247.Google Scholar
- Guy RD, Fogel MF, Berry JA, and Hoering TC (1987) Isotope fractionation during oxygen production and consumption by plants (pp. 597–600). In Biggins J (editor), Progress in Photosynthesis Research. Martinus Nijhoff, Dordrecht.Google Scholar
- Mook WG, Bommerson JC, and Staverman WH (1974) Carbon isotope fractionations between dissolved bicarbonate and gaseous carbon dioxide. Earth Planet. Sci. Lett. 22:169–176.Google Scholar
- O’Leary MH, Reife JE, and Slater JD (1981) Kinetic and isotope effect studies of maize phosphoenolpyruvate carboxylase. Biochemistry 20:7038–7314.Google Scholar
- Park R and Epstein S (1960) Carbon isotope fractionation during photosynthesis. Geo- chim. Cosmochim. Acta 21:110–126.Google Scholar
- Sharkey TD and Berry JA (1985) Carbon isotope fractionation of algae as influenced by an inducible CO2 concentrating mechanism. In Lucas WJ and Berry JA (editors), Inorganic Carbon Uptake by Aquatic Organisms. American Society of Plant Physiologists, Rockville, Maryland.Google Scholar
- Troughton JH, Card KA, and Hendy CH (1974) Photosynthetic pathways and carbon isotope discrimination by plants. Carnegie Inst. Wash. Yearb. 73:768–780.Google Scholar
- Vogel JC (1980) Fractionation of Carbon Isotopes During Photosynthesis. Springer- Verlag, Berlin.Google Scholar