Genetical and environmental analyses of yield in six biparental soybean crosses

Pesquisa Agropecuária Brasileira

JosÉ Francisco Ferraz De Toledo²  Carlos Alberto Arrabal Arias²  Marcelo Fernandes De Oliveira¹  ClÁudia Triller¹  Zilda De FÁtima Sgobero Miranda¹ 

[1] ,Empresa Brasileira de Pesquisa Agropecuária Centro Nacional de Pesquisa de Soja Londrina PR

关键词: Glycine max;    genetic control;    selection;    polygenes;    genotype environment interaction;    breeding methods;    Glicyne max;    controle genético;    seleção;    poligenes;    interação genótipo-ambiente;    métodos de melhoramento;   

DOI  :  10.1590/S0100-204X2000000900011

来源: SciELO

【 摘 要 】

The yearly genetic progress obtained by breeding for increased soybean yield has been considered acceptable worldwide. It is common sense, however, that this progress can be improved further if refined breeding techniques, developed from the knowledge of the genetic mechanisms controlling soybean yield, are used. In this paper, data from four cultivars and/or lines and their derived sets of F2, F3, F7, F8, F9 and F10 generations assayed in 17 environments were analyzed to allow an insight of the genetic control of soybean yield under different environmental conditions. The general picture was of a complex polygene system controlling yield in soybeans. Additive genetic effects predominated although dominance was often found to be significant. Complications such as epistasis, linkage and macro and micro genotype x environment (G x E) interactions were also commonly detected. The overall heritability was 0.29. The relative magnitude of the additive effects and the complicating factors allowed the inference that the latter are not a serious problem to the breeder. The low heritability values and the considerable magnitude of G x E interactions for yield, however, indicated that careful evaluation through experiments designed to allow for the presence of these effects is necessary for successful selection.

【 授权许可】

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