Original scientific paper
Does Genetic Distance of Parental Forms Affect Specific Combining Ability and Heterosis Eff ects in F1 and F2 of Spring Rape Diallel Cross?
Jan BOCIANOWSKI
; Department of Mathematical and Statistical Methods,Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
Tadeusz ŁUCZKIEWICZ
; Department of Genetics and Plant Breeding, Poznan University of Life Sciences,Wojska Polskiego 71C, 61-625 Poznan, Poland
Marcin KOZAK
; Department of Experimental Design and Bioinformatics, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776 Warsaw, Poland
Henryk BRZESKWINIEWICZ
; Department of Mathematical and Statistical Methods,Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
Abstract
This paper aims to probe into relationships between genetic diversity of inbred lines, estimated through the Mahalanobis distance and the effects of specific combining ability (SCA) and heterosis. The SCA and heterosis effects were analyzed for nine quantitative traits of eight inbred lines and their diallel cross hybrids of spring rape. The field experiments (with F1 and F2 generations) were carried out in a partly balanced square design with four replications. The results show that the Mahalanobis distances for inbred lines and SCA effects of the hybrids were mostly positively correlated. However, the Mahalanobis distances were usually not related, or very weakly, with the heterosis effects. On this basis we conclude that it is possible that the genetic diversity of crossed lines does not have to affect heterosis effects in the hybrids derived from the crossing. Since, as far as could be determined, this is the first conclusion of this type in literature, it calls for further research to study this phenomenon.
Keywords
genetic distance; heterosis; Mahalanobis distance; phenotypic correlations; SCA; spring rape
Hrčak ID:
31234
URI
Publication date:
18.12.2008.
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