Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 59:38-41 (1977)
© 1977 American Society of Plant Biologists

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Articles

Ribulose Bisphosphate Carboxylase

Altered Genetic Expression in Tall Fescue 1

Douglas D. Randall2, Curtis J. Nelson3 and Kay H. Asay3,4

a Departments of Biochemistry and Agronomy, University of Missouri, Columbia, Missouri 65201

A decaploid tall fescue (Festuca arundinacea Schreb) genotype has been found which exhibits net photosynthetic rates of 32 to 41 mg CO2/dm2·hour as opposed to a mean of 22 mg CO2/dm2·hour for 10 hexaploid genotypes. The decaploid genotype exhibited a ribulose 1,5-bisphosphate (RuBP) carboxylase specific activity 1.3- to 2-fold higher than typical tall fescue genotypes. Specific activities of photorespiratory enzymes and nitrate reduction enzymes were lower in the decaploid than the hexaploid genotypes. Results suggest that genetic expression of RuBP carboxylase activity may have been altered to increase the net photosynthesis rate in the decaploid genotype.

2 Department of Biochemistry.

3 Department of Agronomy.

4 Present address: Agricultural Research Service, USDA, Logan, Utah 84552.

1 Contribution from the Mo. Agric. Exp. Stn., Columbia, Mo. 65201. Journal Series 7559.




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Copyright © 1977 by the American Society of Plant Biologists