Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 15:5-7 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Mitochondrial Efficiency and Growth Rate in Sugarbeet1

D. L. Doney, R. E. Wyse and J. C. Theurer2

Growth rate and root mltochondrial oxidative phosphorylation measurements were made on sugarbeet (Beta vulgaris L.) to examine the relationships between these important factors. Measurements were made on eight hybrids and their inbred parents on four dates in 1971 and on two hybrids and their inbred parents at bi-weekly intervals in 1972. Hybrids had faster growth rates (root and total weight) and more efficient mitochondria (larger ADP:0 ratios) than their inbred parents. Root mitochondrial measurements [RC (respiratory control) ratio, ADP:0 ratio, and state-3 (ADP stimulated respiration) oxidation rate] made in 1971 were largest when plants were growing most rapidly (Aug. I to 7) and smallest in stored roots (Nov. 15). In 1972, mitochondrial efficiency (ADP:0 ratio) measurements departed from growth-rate measurements in the early and latter part of the growing season but were highly correlated (r ≥ 0.87) with root fresh weight and total dry weight from early July to mid-October. A close relationship was obtained between root mitochondrial efficiency (ADP:0 ratio) and growth rate throughout the major part of the growing season.

Key Words: Beta vulgaris L. • Oxidative phosphorylation • Adenosine diphosphate • Photosynthesis

1 Cooperative investigations of the ARS, USDA, The Beet Sugar Development Foundation; and the Utah State Agr. Exp. Stn. Approved as Journal paper no. 1792, Utah Agr. Exp. Sm., Logan, UT 84322.

2 Geneticist, plant physiologist, and geneticist, respectively, ARS, USDA, Crop Research lab., UMC 63, Utah State University, Logan, UT 84322.

Received for publication March 19, 1974.




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