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Published in Crop Sci 12:493-494 (1972)
© 1972 Crop Science Society of America
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Mitochondrial Complementation in Sugar Beet1

D. L. Doney, J. C. Theurer and R. E. Wyse2

Physiologically active mitochondria were isolated from roots of 10-week old sugar beet (Beta vulgaris L.) inbreds and hybrids as well as inbreds in the bolting stage of growth. Mitochondrial oxidation and phosphorylation (ADP:O and R:C ratios) using alpha-ketoglutarate substrate were measured for each inbred, 1:1 mixtures of the inbreds, and for the hybridsi The 1:1 mixtures of inbreds had APD:0 and R:C ratios higher than either inbred parent for combinations that exhibit heterosis for root yield (complementation), and ADP-O and R:C ratios between the two inbred parents for combinations that do not show heterosis. Heterotic hybrids had ADP:O and R:C ratios slightly higher than those of the l:l mixlures.

Key Words: Heterosis • Hybrid • Inbred • Oxidative phosphorylation • Mitochondria • Complementation • Respiratory control

1 Cooperative investigations of the Plant Science Research Division, ARS, USDA; the Beet Sugar Development Foundation; and the Utah Agricultural Experiment Station. Approved as journal paper No. 1186, Utah Agricultural Experiment Station, Logan.

2 Research Geneticist, Research Geneticist, and Plant Physiologist, respectively, PSRD, ARS, USDA, Crops Research Laboratory, Utah State University, Logan.

Received for publication January 20, 1972.




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