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Published in Crop Sci 9:79-81 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Absence of Dominance of the Cu Gene in Influencing o-Hydroxycinnamic Acid Content in Melilotus alba1

H. J. Gorz and F. A. Haskins2

The average content of o-hydroxycinnamic acid in sweetclover plants of the CuCu genotype was 36% of the level found in CuCu plants. Thus, the level of o-hydroxycinnamic acid in the F1 was more like the content of the cucu parent than that of the CuCu parent, indicating that Cu was partially dominant over Cu. The calculated value for the degree of dominance of cu over Cu was +0.299. The partial dominance of the cu gene provides an explanation for the difficulty experienced in classifying plants in segregating populations.

Key Words: Sweetclover • Coumarin

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Nebraska Agricultural Experiment Station, Lincoln, Nebr. Supported in part by the National Science Foundation (Grant No. GB-1148). Published with the approval of the Director as Paper no. 2387, Journal Series, Nebraska Agr. Exp. Sta.

2 Research Geneticist, Crops Research Division, ARS, USDA, and Bert Rodgers Professor of Agronomy, University of Nebraska, Lincoln 68503, respectively. The assistance of Dr. C. O. Gardner and J. J. Hammond in analyzing the data and the technical assistance of J. F. Hermanussen and A. F. Welty are gratefully acknowledged.

Received for publication July 24, 1968.




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