Heterosis in crosses among white grain maize populations with high quality protein
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Data
2006-01
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Resumo
The objective of this work was to investigate heterosis and its components in 16 white grain maize
populations presenting high quality protein. These populations were divided according to grain type in order to
establish different heterosis groups. The crosses were carried out according to a partial diallel cross design
among flint and dent populations. Seven agronomic traits were evaluated in three environments while four leaf
diseases and incidence of corn stunt were evaluated in one. Least square procedure was applied to the normal
equation X’Xβ = X’Y, to estimate the model effects and their respective sum of squares. Among the heterosis
components, in diallel analysis, significance for average heterosis in grain yield, number of days to female
flowering and to all evaluated diseases was detected. Specific heterosis was significant for days to female
flowering and resistance to Puccinia polysora. Results concerned to grain yield trait indicate that populations
with superior performance in dent group, no matter what flint population group is used in crosses, tend to
generate superior intervarietal hybrids. In decreasing order of preference, the dent type populations CMS 476,
ZQP/B 103 and ZQP/B 101 and the flint type CMS 461, CMS 460, ZQP/B 104 and ZQP/B 102 are recommended to
form composites.
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Zea mays, Partial diallel, Dialelo parcial, Capacidade geral de combinação, General combining ability
Citação
RODRIGUES, Márcio Costa; CHAVES, Lázaro José; PACHECO, Cleso Antônio Patto. Heterosis in crosses among white grain maize populations with high quality protein. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 41, n.1, p. 59-66, Jan. 2006.