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Mean, genetic variance, and usefulness of selfing progenies from intra- and inter-pool crosses in faba beans (Vicia faba L.) and their prediction from parental parameters
Authors:R. K. Gumber  B. Schill  W. Link  E. v. Kittlitz  A. E. Melchinger
Affiliation:Institut für Pflanzenzüchtung, Saatgutforschung und Populationsgenetik, Universit?t Hohenheim, D-70593 Stuttgart, Germany Fax: +49-711459 2334 E-mail: melchinger@uni-hohenheim.de, DE
Landessaatzuchtanstalt, Universit?t Hohenheim, D-70593 Stuttgart, Germany, DE
Abstract: Determining the genetic potential of a base population from the properties of their parental lines would improve the efficiency of a breeding program. In the present study, we investigated whether the means of the parents and the genetic distance determined from RAPD data (GD) or multivariate analysis (Mahalanobis D2), mid-parent heterosis (MPH), and the absolute difference between means of the parents (∣P1−P2∣) can be used for predicting the means and genetic variances (σ^2 g ) of F3:4 lines derived from different crosses in faba beans. The material comprised 18 intra- and 18 inter-pool crosses among lines from the Minor, Major, and Mediterranean germplasm pools. Fifty F3:4 lines from each cross were evaluated for days to anthesis, plant height, seeds per plant, and seed yield in German (GE) and Mediterranean (ME) environments. GD estimates between parent lines ranged from 0.38 to 0.58, while D2 ranged from 45.5 to 134.7. Correlations between means of the parents and F3:4 lines were highly significant for most traits. Estimates of σ2 g for all traits showed non-significant correlations with MPH, GD, D2. In one ME, ∣P1−P2∣ had significant associations with σ^2 g for seed yield and days to anthesis. The predicted usefulness of crosses, defined as the sum of the population mean and selection responses, was most closely associated with the means of F3:4 lines. We conclude from this study that the means of F3:4 lines can be predicted from the means of the parents, whereas the prediction of genetic variance is still an unsolved problem Received: 12 December 1997 / Accepted: 13 July 1998
Keywords:  Vicia faba L.  RAPD  Mahalanobis genetic distance  Usefulness  Genetic variance  Mid-parent heterosis
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