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Published in Crop Sci 6:597-600 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Preliminary Groupings of Plant Introductions of Alfalfa (Medicago sativa, L.) for Heterosis Studies1

John W. Dudley and R. L. Davis2

In preparation for a study of between and within group crosses as sources of heterotic combinations we classified 144 plant introductions into eight groups. Three replications of five plant plots of each introduction were grown from original seed in North Carolina and Indiana and evaluated for a number of characters. Based on origin, winter-hardiness, leafhopper yellowing score, growth index in North Carolina and growth index in Indiana we classified 7 introductions of M. sativa var. gaetula as gaetula; 5 introductions as gaetula-like; 50 as Chilean; 20 as Chilean-like; 90 as Flemish; 19 as Afghan; 9 as Afghan-like; and 14 as non-hardy. When the groups with the suffix "-like" were combined with groups having the same name, five major groups were formed. Countries considered to be in the center of origin of alfalfa contributed entries to all but the Chilean major groups.

Ways of using the proposed groups for increased efficiency in the search for heterotic combinations and for more precise preliminary classification of new plant introductions are proposed.

1 Contribution from the Crops Research Division, Agricultural Research Service, United States Department of Agriculture, the North Carolina Agricultural Experiment Station, and the Purdue University Agricultural Experiment Station. Approved as paper no. 2099 of the North Carolina AES Journal Series and no. 9800 of the Purdue University AES.

2 Geneticist, Crops Research Division, ARS, USDA Raleigh, N.C. (now Associate Professor of Plant Genetics, Agronomy Department, University of Illinois, Urbana) and Professor of Agronomy, Purdue Agricultural Experiment Station, Lafayette, Inc.

Received for publication July 9, 1966.




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