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Published in Crop Sci 11:731-734 (1971)
© 1971 Crop Science Society of America
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Evaluation of Cross-fertilization in Forage Crops1

H. J. Gorz and F. A. Haskins2

In the improvement of forage crop varieties knowledge of the extent of cross-fertilization is of value for (1) determining the extent and randomness of crossing in breeding procedures, (2) estimating varietal changes due to contamination and mechanical mixtures, and (3) evaluating effects of cross-fertilization in the development and production of synthetic and hybrid combinations. Genetic markers can aid greatly in the evaluation of cross-fertilization, and thus in the development and production of new varieties. Ideally, markers should be distinctive and readily detected in the seedling stage, conditioned by a single dominant gene with complete penetrance, and have no adverse effects on plant growth, zygote viability, or randomness of cross-pollination.

Key Words: Genetic markers • Hybrid forages • Varietal contamination • Forage breeding

1 Paper presented at Pollination and Seed Set Symposium, American Society of Agronomy meetings, Tucson, Ariz., August 24, 1970. Contribution from the Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, and the Nebraska Agricultural Experiment Station, Lincoln 68503. Published with the approval of the Director as Paper No. 3069, Journal Series, Nebraska Agr. Exp. Sta. Research reported was conducted under Project No. 12-27.

2 Research Geneticist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, and Bert Rodgers Professor of Agronomy, University of Nebraska.

Received for publication March 20, 1971.




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