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Inheritance of Tolerance to Soil-Borne Oat Mosaic Virus in Oats¹

Information was obtained on the reaction of segregating populations of oats (Avena byzantina C. Koch and Avena sativa L.) to soil-borne oat mosaic virus, Marmor terrestre var. typicum. Bulk F₃ lines were evaluated at two locations that had natural mosaic infestation in the soil. Frequency distributions of mosaic scores indicated that tolerance to OMV was a quantitative character. Heritability estimates based on progeny means ranging from .59 to .88 indicated that a large portion of the variability in tolerance to the virus is heritable. A heritability estimate based on individual plots was lower. Estimates of expected genetic advance indicated that selection of 5% of the more tolerant lines would result in lower mosaic scores, although the resulting scores would not approach the tolerant parent. Evaluation for tolerance at one location was a reliable indication of tolerance at the second location.

Key Words: Avena byzantina • Avena sativa • Disease tolerance • Heritability • Expected genetic advance • Selection

² Former Graduate Research Assistant (deceased), Associate Professor, and Professor, respectively.

Received for publication April 22, 1971.