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Plant Physiology 72:76-79 (1983)
© 1983 American Society of Plant Biologists

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Articles

Variability of Reaction Kinetics for Ribulose-1,5-bisphosphate Carboxylase in a Barley Population 1

Claire A. Rinehart2, Scott V. Tingey2 and William R. Andersen3

Department of Botany and Range Science, Brigham Young University, Provo, Utah 84602

The photosynthetic enzyme ribulose bisphosphate carboxylase-oxygenase [EC 4.1.1.39] (RuBPCase) plays a key role in the carbon reduction system of plants. In this study, we determined the kinetic variability of RuBPCase among 46 varieties of Hordeum vulgare L. at two ages. The Vmax CO2 and Km CO2 of RuBPCase was determined for each cultivar. Varietal differences were found in Km CO2 and Vmax CO2 for one and four genotypes, respectively. One variety exhibited atypical behavior in both Km and Vmax. A comparison of varieties and age showed a significant interaction between these factors for Km but not for Vmax. These data indicate the presence of kinetic variability in RuBPCase within the H. vulgare population and perhaps between plant ages.

2 Present address: Department of Botany, University of Georgia, Athens, GA 30602.

3 To whom reprint requests should be addressed.

1 This work was supported by a grant from the United States Department of Agriculture Competitive Grants Program 5901-0410-9-0387.






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Copyright © 1983 by the American Society of Plant Biologists