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Published in Crop Sci 10:646-649 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Winter Hardiness in Oat Populations Derived from Reciprocal Crosses1

F. J. Muehlbauer, H. G. Marshall and R. R. Hill, Jr.2

Significant differences in freezing resistance and winter hardiness occurred between the F3 populations of certain reciprocal crosses in oats (Avena sativa L. and A. byzantina K. Koch). Heritabilities were high and selection for both freezing resistance and winter hardiness should be effective. Specific combining ability of parents and differences among F3 lines within crosses were important sources of variation for winter snrvival, but general combining ability, maternal effects, and reciprocal effects over all populations were relatively unimportant. The contribution of parents was consistent over locations, but lines within crosses were inconsistent over locations. Transgressive segregation for winter hardiness was common in the F3 populations derived from crosses between the winter and spring parents.

Key Words: Cytoplasmic influence • Heritability • Freezing resistance • Combining ability

1 Joint contribution from the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the Department of Agronomy, The Pennsylvania Agricultural Experiment Station, University Park, Pa. 16802. Approved for publication on July 11, 1969, as Paper No. 3628, Journal Series. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at The Pennsylvania State University.

2 Formerly Graduate Assistant (now Geneticist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, at Pullman, Wash.); and Research Agronomists, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and Associate Professors of Agronomy, respectively.

Received for publication March 16, 1970.


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