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Gene Action for Yield Components and Plant Height in a Spring Wheat Cross¹

Means and variances for the parental, F¹ F² and singlebackcross generations were used to analyze quantitativegenetic variation in the wheat (Triticum aestivum L.) cross ‘Henry’ x ‘Lemhi 53’'. In both 1967 and 1968, epistatic effects were non-significant in the inheritance of number of spike lets and kernel weight. Additive gene action had the greatest effect on number of spikelets; both additive and dominance types of gene action influenced kernel weight. In 1967, highly significant epistatic effects were detected in the inheritance of number of heads, yield and plant height. In 1968, epistatic effects were nonsignificant for these traits. When epistatic effects were significant, the metrical value of the F₁ markedly exceeded the value of the higher parent.

Key Words: Genetic variation • Epistasis • Additive effect • Dominance effect • Heritability • Quantitative variation • Triticum aestivum L.

² Associate Professor of Agronomy and Genetics, Montana State University, and Research Agronomist, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture, Bozeman, Montana 59715.

Received for publication October 9, 1970.