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Root Storage Respiration Rate in a Diallel Cross of Sugarbeet¹

A 2-year study of root respiration rate was conducted for eight sugarbeet (Beta vulgaris L.) inbreds and their 28 diallel crosses in 1974 and nine inbreds and their 36 diallel crosses in 1975. Objectives were to determine the potential of selection and breeding to reduce sugar losses in storage. Hybrids usually showed a lower respiration rate than either inbred parent. Heterosis for low respiration rate was observed both years. General and specific combining ability was significant, indicating that respiration rate is governed in part by both additive and non-additive gene acton. Thus, selection to reduce storage sugar losses due to respiration can be effective in sugarbeets. Selection for low respiration rate will not adversely affect root yield or sugar content.

Key Words: Sugar loss • Sugarbeet breeding • Storage rot • Combining ability • Selection

² Geneticist, plant physiologist, and geneticist, respectively, ARS, USDA, Crops Research Laboratory, UMC 63, Utah State Univ., Logan, UT 84322.

Received for publication March 10, 1977.