Abstract
A breeding program based on heterosis exploitation needs the knowledgment of the germplasm to produce good combinations in superior hybrids. A study was conducted to evaluate inbred lines, derived from synthetic maize CMS 61, in a diallel mating design.
Highlights
RESUMO - Um programa de melhoramento com sucesso, baseado na exploração da heterose, necessita do conhecimento do germoplasma, para selecionar linhagens promissoras capazes de produzir combinações híbridas superiores
The hybrid check out yielded the best single cross by 32.94%. This check mean yield greater than the means of the single crosses can be explained because they were produced with lines extracted from the same synthetic population
For mean ear yield over locations the coefficient of variation of 16.22% was considered of median magnitude (Scapim et al, 1995)
Summary
RESUMO - Um programa de melhoramento com sucesso, baseado na exploração da heterose, necessita do conhecimento do germoplasma, para selecionar linhagens promissoras capazes de produzir combinações híbridas superiores. Os dados da produtividade de espigas (kg ha-1) dos quatro locais foram analisados utilizando-se o método 2, modelo 1 de Griffing. A análise de variância combinada mostrou efeitos altamente significativos (P < 0.01) para locais, cruzamentos, linhagens, CGC e CEC. The evaluation of genetic variation of lines proposed by Griffing (1956) is based in the concepts of general and specific combining abilities established by Sprague & Tatum (1942), who presented detailed methods for analyzing fixed set of lines or varieties in diallel crosses, which have been used extensively in breeding of several economic crops. The diallel cross method have been utilized widely in maize breeding programs to evaluate the genetic potential of inbred lines and others. Genotypes, but its limitation is the increasing number of crosses in accordance with the increase in number of lines (Gonçalves, 1987; Hallauer & Miranda Filho, 1988; Kempthorne & Curnow, 1961; Martins & Miranda Filho, 1997; Miranda Filho & Vencovsky, 1999)
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