Combining ability of wheat genotypes in two models of diallel analyses

• Main Authors: Giovani Benin, Velci Queiroz de Souza, Igor Pirez Valério, Fernando Irajá Félix de Carvalho, Antonio Costa de Oliveira, Rafael Nornberg, Guilherme Ribeiro, Douglas André Malmann Schmidt, Henrique Luch
• Format: Article
• Language: English
• Published: Brazilian Society of Plant Breeding 2009-01-01
• Series: Crop Breeding and Applied Biotechnology
• Subjects: BLUP; Griffing; fixed; random; quantitative traits.
• Online Access: http://www.sbmp.org.br/cbab/siscbab/uploads/c8129491-836d-69c9.pdf

Diallel analyses are commonly used for the estimate of population genetic effects. Different models can beused, with a direct effect on the inferences. The objective of this study was to determine and compare two diallel analysismodels, fixed and random, regarding the combining effects among six wheat genotypes. The experiment was conducted in thecounty of Capão do Leão/RS in the year 2006. Six wheat genotypes were used that were used for artificial crosses accordingto a complete diallel model without reciprocals, resulting in 15 hybrid combinations. The data were subjected to diallelanalyses according to model 2 of Griffing (fixed) and BLUP (random). The results show that both diallel models indicatesimilar general combining ability effects. On the other hand, for the specific combining ability, the data must be used withcaution, considering the two models simultaneously.