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Plant Physiology 70:381-387 (1982)
© 1982 American Society of Plant Biologists

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Articles

A Mutant of Arabidopsis thaliana Which Lacks Activation of RuBP Carboxylase In Vivo1

C. R. Somerville, Archie R. Portis, Jr. and William L. Ogren

Department of Genetics, University of Alberta, Edmonton, Alberta T6G 2E9 Canada, Department of Agronomy, University of Illinois, Urbana, Illinois 61801, United States Department of Agriculture-Agricultural Research Service, Urbana, Illinois 61801

A mutant of Arabidopsis thaliana has been isolated in which ribulose-1,5-bisphosphate carboxylase is present in a nonactivatable form in vivo. The mutation appears to affect carboxylase activation specifically, and not any other enzyme of the photosynthesis or photorespiratory cycles. The effect of the mutation on carboxylase activation is indirect, inasmuch as the properties of ribulose-1,5-bisphosphate carboxylase purified from the mutant are not distinguishable from those of the wild type enzyme. The mutant requires high levels of atmospheric CO2 for growth because photosynthesis is severely impaired in atmospheres containing normal levels of CO2, irrespective of the atmospheric O2 concentration. In this respect, the mutant is distinguished from previously described high-CO2 requiring mutants of Arabidopsis which have defects in photorespiratory carbon or nitrogen metabolism.

1 Supported in part by Grant 5901-0410-9-0341-0 from the United States Department of Agriculture Competitive Research Grants Office and Grant A7847 from the Natural Sciences and Engineering Research Council of Canada.




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