Genetic control of maize flowering / Controle genÃtico do florescimento em milho

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this work was to study the genetic control of maize flowering. Two inbred lines of the maize breeding program of Biology Department (DBI) of the Federal University of Lavras (UFLA) were used. The two lines were crossed to obtain F1, F2, RC1 e RC2 populations. The experimental design was randomized complete blocks with two replications, led in the experimental area of DBI/UFLA, in the growing season of 2005/06. Thirty two seeds of parent 1 (P1), 27 of parent 2 (P2), 17 of F1, 172 of F2, 130 of RC1 and 185 of RC2 were sown. The plants of each plot were evaluated, using day-degrees between the sown and flowering. In this study we used means and variance components. All models of means components had R2 values near 100% and the simple model, called additive dominant was considered. Also for the variance components the model involving the additive variance, dominance variance and environmental variance was enough to explain the genetic control of maize flowering. The results showed the presence of dominant gene effects. The heritability was 48.81%, showing that selection based on phenotype should be efficient, however, there was environmental factors, which accounted for 31.39% of the total variation. Maize flowering showed be an oligogenic character, controlled by 9 genes. The selection gain was estimated to be 5.01% for the first selection cycle in the F2 population.

ASSUNTO(S)

estÃdios de desenvolvimento zea mays l. genetic components componentes genÃticos herdabilidade zea mays l. agronomia developmental phases heritability

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