Comparison among inbreeding systems in maize
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Data
2001
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Resumo
The use of less severe inbreeding systems than self-fertilization has been suggested as a means of
developing more vigorous maize lines (Zea mays L.). To compare different inbreeding systems, nine traits
were evaluated in inbred lines developed by full-sib mating (F=0.5), self-fertilization (F=0.5), half-sib mating
(F= 0.305), from the following populations: BR 105, a synthetic variety, and ESALQ-PB 4 , which is a composite
of wide genetic base. The means and genetic parameters comparisons showed no important advantages of
full-sib crosses over selfing. The inbreeding depression values for grain yield were similar between these
groups of lines and inferior for half-sib lines. The inbreeding depression rates / 1% of expected homozigosity
were similar among the three inbreeding systems. We conclude, in view of large inbreeding depression showed
by tropical populations of maize in Brazil, that it is more reasonable to allocate resources and time in breeding
source populations than to use milder forms of inbreeding
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Maize, Zea mays, Inbreeding, Tropical maize populations, Inbreeding depression
Citação
RODRIGUES, Márcio Costa et al. Comparison among inbreeding systems in mayze (Zea mays L.). Crop Breeding and Applied Biotechnology, Viçosa, v. 1, n. 2, p. 105-114, 2001.