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The Heritability of Agronomic and Disease Reaction Characteristics in Two Barley Crosses¹

Synopsis: A genotypic model is presented for determining the additive genetic variance among bulk progenies in self-pollinated crops for use in calculating heritability. In the late stages of inbreeding the portion of genetic variance due to dominance is insignificant when compared to the genetic variance contributed by additive genetic effects.

The heritability percentages for yield measured in 3 different experiments in barley averaged about 62% and were remarkably uniform when compared to the heritabilities of other agronomic and disease reaction characteristics measured in the F₆ barley strains. Date of heading and plant height were the most highly heritable of the agronomic characteristics, and mildew reaction was also highly heritable.

² Formerly graduate assistant at Michigan State University, East Lansing, Mich., and currently post-doctorate research fellow at Iowa State College, Ames, Iowa. The author expresses his sincere appreciation to Drs. K. T. Payne, J. E. Grafius and K. J. Frey for guidance in conducting this study and preparing the manuscript.

Received for publication February 13, 1956.