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Published in Crop Sci 6:173-176 (1966)
© 1966 Crop Science Society of America
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Natural Selection for Cold Resistance in Winter Oat Bulk Populations1

H. G Marshall2

The effect of 3 consecutive years of severe natural selection pressure on the cold resistance of 23 different winter oat bulk populations during the F3, F4, and F5 generations was determined. Controlled freezing tests with remnant seed from these generations and the F2, which was not subjected to winter stress, demonstrated that natural selection caused a significant increase in cold resistance each year when averaged over all populations. The total change in cold resistance during the three generations was significant for 17 of the 23 populations, and the amount of change was negatively correlated with the initial level of cold resistance. Although the amounts of winterkilling in individual plots were not consistent with the changes in cold resistance, the totals over the 3 years for these characteristics were positively correlated. The correlation coefficients between survivals of the various generations were all significant. It was concluded that natural selection increased cold resistance when the initial survival value of a population was low in response to the selection pressure for winter survival. Although F3 cold resistance provided a relatively accurate prediction of F6 performance, the low populations had the greatest potential for change under the selection pressures which prevailed.

1 Joint contribution from the Crops Research Division, ARS, USDA, and the Department of Agronomy, Pennsylvania Agricultural Experiment Station, University Park. Approved for publication on August 2, 1965, as Paper No. 3046, Journal Series, Pennsylvania Agr. Exp. Sta. This study was part of Northeast Regional Project NE-23 Rev. "Developing Improved Oat Varieties for the Northeastern Region," a cooperative study involving Agricultural Experiment Stations in the Northeast Region and the Cereal Crops Research Branch, Crops Research Division, ARS, USDA, and supported in part by regional funds.

2 Research Agronomist, Crops Research Division, ARS, USDA, and Assistant Professor of Agronomy.

Received for publication October 29, 1965.




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