Predicting Progeny Means and Variances of Winter Wheat Crosses from Phenotypic Values of Their Parents
- 1 September 2001
- journal article
- Published by Wiley in Crop Science
- Vol. 41 (5), 1470-1478
- https://doi.org/10.2135/cropsci2001.4151470x
Abstract
The efficiency of breeding programs could be increased by predicting the prospects of crosses for line development before producing and testing lines derived from them. In this study, we examined the performance of F4: n (n = 7 or 8) lines randomly derived from 30 winter wheat (Triticum aestivum L.) crosses produced by a factorial mating of five high yielding with six high baking quality cultivars. Our objectives were to (i) contrast the midparent value m̂ ij with ĉij for each cross and apply tests for the presence of epistasis, (ii) compare the estimates of the variance between means of crosses (σ2 c ) with the average segregation variance within crosses (σ2 g ), (iii) determine the variation in σ2 gij among crosses, (iv) evaluate the use of various parameters for predicting cij , σ2 gij , and Uij , and (v) briefly describe quantitative-genetic theory for interpretation of our experimental findings. Twenty-two lines per cross and the respective parents were evaluated in four environments for seven agronomic and quality traits. Additionally, 44 F2:4 lines per cross were tested in hills in two environments. On the basis of first-degree statistics, parental means were good predictors of cross means, yet significant epistatic effects were observed for most traits. In agreement with quantitative-genetic expectations, the genetic variance between σ2 c was of the same size as the variance between parental means and the average σ2 g of F4: n lines within crosses for all traits but sedimentation. Here, the two parental groups differed significantly in their mean, and σ2 g was significantly larger than σ2 c Estimation of the segregation variance (σ2 gij ) for individual crosses is not recommended because they (i) have a large standard error, (ii) can be assessed reliably only in advanced selfing generations, and (iii) are expected to have a minor influence on differences in the usefulness among crosses. Among all predictors investigated, only the parental means can be recommended for predicting the usefulness of crosses. Copyright © 2001. Crop Science Society of America . Published in Crop Sci.41:1470–1478.Keywords
This publication has 22 references indexed in Scilit:
- Genetic Similarities among Winter Wheat Cultivars Determined on the Basis of RFLPs, AFLPs, and SSRs and Their Use for Predicting Progeny VarianceCrop Science, 1999
- On the number and size of cross combinations in a breeding programme of self-fertilizing cropsEuphytica, 1978
- Predicting the properties of recombinant inbred lines derived by single seed descentHeredity, 1976
- Variation and Covariation of Agronomic and Quality Traits in Two Spring Wheat Populations1Crop Science, 1975
- Evaluation of Crosses Among High and Low Yielding Parents of Spring Wheat (Triticum aestivum L.) and Bulk Prediction of Line Performance1Crop Science, 1974
- Comparison of various methods of selecting parents for hybridization in common bread wheat (Triticum aestivum L.)Australian Journal of Agricultural Research, 1973
- F1 Hybrids Versus Random F5 Line Performance and Estimates of Genetic Effects in Spring Wheat1Crop Science, 1971
- Reciprocal Crosses and Their Influence on Wheat Quality 1Crop Science, 1968
- Distance as a Measure of Taxonomic SimilaritySystematic Zoology, 1961
- Evaluation of Bulk Hybrid Tests for Predicting Performance of Pure Line Selections in Hard Red Winter Wheat1Agronomy Journal, 1955