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Evaluation of Early Generation Testing in Spring Barley¹

An analysis was made of the combining abilities of bulks in F₂ and F₃ diallel crosses among 10 barley parents. There were relatively large and significant variances for general combining ability for seed yield, kernel weight, maturity, and plant height. Ratios of general to specific combining ability indicated that most of the genetic variances was associated with general combining ability for these characters. The predictive value with respect to yield and kernel weight of six of the parents and the early-generation bulks of their crosses was measured by the performance of F₅ lines derived from the crosses. The performance of parents themselves, of individual crosses in F₂ and F₃, as well as in the F₂ and F₃ parental arrays were all generally reliable as indications of parental prepotency and the potential value of the crosses, although the predictive value of the F₂ bulks for seed yield was slightly lower than that of the parents and F₃s. The performance of F₁ topcrosses was of limited value for either yield or kernel weight in evaluating parental prepotency.

² Former Graduate Assistant (now Associate Professor of Agronomy, Oklahoma State University) and Professor of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 5510

Received for publication March 20, 1968.