Finding Ranking of Testers in Line X Tester Experiments

Jan Bocianowski, Kamila Nowosad, Henryk Brzeskwiniewicz, Tadeusz Łuczkiewicz


Improvement of crop traits, mainly the characteristics of yield and the extension of genetic variability is the goal of many of breeding projects. It can be realized e.g. by using appropriate forms of parental crosses schemes. If we have a large number of inbred lines (genotypes) experiments is carried out with hybrids obtained by crossing a line × tester (testers). Analyzed the expression of characteristics (usually yield) in F1 hybrids, we can assess the value of the breeding lines. An important question is the selection of testers (tester), which should diversify in the maximum degree analyzed trait (yield) in hybrids. In this paper we presents a model for obtaining ranking testers. This may be important diagnostic tool in breeding selection to obtained new hybrids with significant transgressive effects. An example of the results of field experiments were of spring rape. In this experiment, general combining ability (GCA) effects was evaluated in the F1 generation. The results indicate different (depending on the used testers and analyzed traits) evaluate the GCA effects of inbred line. This approach is new to the practice of breeding and may be useful to the effective selection of the best testers.


Line  tester system crossing; general combining ability; specific combining ability; block design

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