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Published in Crop Sci 14:113-115 (1974)
© 1974 Crop Science Society of America
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Herability of Resistance to Cercospora Leaf Spot in Sugarbeet1

G. A. Smith and E. G. Ruppel2

Narrow-sense heritability estimates, adjusted to account for inbreeding of parental lines, were compared with realized hcritabilitles obtained by actual selection for high and low resistance to Cercospora beticola in sugarbeet (Beta vulgaris). Parental, F1, F2, F3, and polycross populations from high and low selections were field grown under an artificially induced leaf spot epidemic. Heritability estimates, in percent were 24.3±2.9 and 24.3±2.4 for each of two resistant x susceptible crosses. These values were compared with realized heritabilities of 20.47 and 26.71 for the same two resistant x susceptible crosses. Environmental variation accounted for 44 to 62% of the total variation for leaf spot resistance.

Key Words: Cercospora beticola • Beta vulgaris • Gene action

1 Joint contribution of ARS-USDA, the Colorado State University Experiment Station, and the Beet Sugar Development Foundation. Published with the approval of the Director of the Colorado Experiment Station as Scientific Paper Series No. 1893.

2 Research Geneticist and Research Plant Pathologist, USDA, Crops Research Laboratory, Colorado State University, Fort Collins, CO 80521.

Received for publication August 22, 1973.




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