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Polymorphism for Vernalization Requirement in a Winter Oat Cultivar¹

‘Blount’ oats (Avena sativa L.) is a winter cultivar that showed about 35% spring-type plants when spring-planted in Tennessee. The spring-type plants were as winter-hardy as the winter-type plants and nonresponsive to vernalization. Blount was variable for heading time after fall planting, but the variation was not related to the vernalization response. The polymorphism for vernalization requirement apparently had no adverse or beneficial effects on the population when fall-planted, except for possible benefits in population stability over seasons. However, with spring planting the original cultivar was more productive than the homogeneous winter-type populations, but much less productive than the spring-type population. Winter-hardy cultivars not requiring vernalization may be useful in areas where high levels of winter-hardiness are not needed and where both spring and fall planting may be desirable.

Key Words: Arena sativa L. • Winterhardihess • Oat breeding • Population variability • Bulk populations

² Professors of agronomy, Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616.

Received for publication August 15, 1977.