General and specific combining ability of tropical and subtropical maize (Zea mays) lines.
Keywords:Lines, testers, GCA, SCA, hybrids.
lines were crossed with six inbreds used as testers, with the
objective of examining their general and specific combining
ability and determine their usefulness in a hybridization
program. The crosses were evaluated in three environments
at Mexico during 1997. General combining ability (GCA)
and specific combining ability (SCA) effects were calculated
using a Line x Tester analysis. CML264 (1586 kg/ha) and
CML319 (1285 kg/ha) were the highest GCA lines in the
tropical and subtropical group, respectively. The highest
SCA effects were for the crosses CML322 x M.L.S4-1 (1651
kg/ha) and CML258 x SSE255-18-19 (1512 kg/ha). These
results indicate that it is possible to develop a hybrid program
using the best lines released by the International Maize and
Wheat Improvement Center (CIMMYT), and the best testers
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