Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:465-466 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Intra- and Intervariety Crosses of Medicago sativa L. and Medicago falcata L.1

Sutat Sriwatanapongse and C. P. Wilsie2

Interspecific, intervariety, and intravariety crosses in alfalfa were compared for expression of heterosis. In spaced plantings, highest yields were obtained from interspecific crosses, followed by inter-variety and finally by intravariety crosses. Variability within progenies was increased through hybridization, unrelated parents having the most effect. The importance of genetic diversity in parents as a determinero f heterosis is considered.

Key Words: heterosis • variability • interspecific • combining ability • hybridization

1 Journal Paper No. J-5884 of the Iowa Agriculture and Home Economics Experiment Station. Project 1048. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Formerly Rockefeller Foundation Scholar, and Professor, Department of Agronomy, Iowa State University, Ames, Iowa 50010.

Received for publication February 9, 1968.


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