Combining ability of twelve maize populations

Pesquisa Agropecuária Brasileira

Elton Vacaro²  José Fernandes Barbosa Neto¹  Diego Girardi Pegoraro¹  Claudio Natalino Nuss²  Leo Duc Haa Conceição¹ 

[1] ,Agroeste Sementes Ltda.Xanxerê SC

关键词: Zea mays;    germplasm;    heterosis;    genetic variation;    Zea mays;    germoplasma;    heterose;    variação genética;   

DOI  :  10.1590/S0100-204X2002000100009

来源: SciELO

【 摘 要 】

Genetic progress depends on germplasm quality and breeding methods. Twelve maize populations and their crosses were evaluated to estimate combining ability and potential to be included as source populations in breeding programs. Plant height, point of insertion of the first ear, number of ears per plant, number of grains per ear, root and stalk lodging and grain yield were studied in two locations in Brazil, during the 1997/98 season. Genotype sum of squares was divided into general (GCA) and specific (SCA) combining ability. Results indicated the existence of genetic divergence for all traits analyzed, where additive effects were predominant. The high heterosis levels observed, mainly in Xanxerê, suggested the environmental influence on the manifestation of this genetic phenomenon. Populations revealed potential to be used in breeding programs; however, those more intensively submitted to selection could provide larger genetic progress, showing the importance of population improvement for the increment of the heterosis in maize.

【 授权许可】

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