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Articles

Variations in K_m(CO₂) of Ribulose-1,5-bisphosphate Carboxylase among Grasses

¹ Taxonomy Unit, Research School of Biological Sciences, The Australian National University, Canberra City 2601, Australia, ² Department of Environmental Biology, Research School of Biological Sciences, The Australian National University, Canberra City 2601, Australia

A survey of the K_m(CO₂) values of ribulose-1,5-bisphosphate carboxylase from 60 grass species shows that enzyme from C₃ grasses consistently exhibits lower K_m(CO₂) than does that from C₄ grasses. Systematically ordered variation in K_m(CO₂) of ribulose-1,5-bisphosphate carboxylases from C₃ and C₄ grasses is also apparent and, among C₄ grasses, this shows some correlation with C₄ types.

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