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vol.23 issue2Isoenzymatic variation in the germplasm of Brazilian races of maize (Zea mays L.)Yield stability in maize (Zea mays L.) and correlations among the parameters of the Eberhart and Russell, Lin and Binns and Huehn models author indexsubject indexarticles search
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Genetics and Molecular Biology

Print version ISSN 1415-4757On-line version ISSN 1678-4685

Abstract

PATERNIANI, Maria Elisa Ayres Guidetti Zagatto et al. Diallel crosses among maize lines with emphasis on resistance to foliar diseases. Genet. Mol. Biol. [online]. 2000, vol.23, n.2, pp.381-385. ISSN 1415-4757.  https://doi.org/10.1590/S1415-47572000000200024.

Ten elite maize (Zea mays L.) lines were crossed in a complete diallel scheme and the single-cross hybrids obtained were assessed at four experimental stations of the Agronomic Institute of Campinas, in São Paulo State, Brazil. The experiments were set up in a randomized complete block design with three replications, including four commercial checks. The experimental plots consisted of two 5-m rows spaced at 0.9 m, with a total of 50 plants. The traits assessed included: days to mid-tassel pollen shed (DPS), plant height (PH), ear height (EH), grain yield, corrected for a 50-plant stand and 14% moisture (GY corr.), and resistance to Phaeosphaeria maydis and Puccinia polysora. General and specific combining ability effects (GCA and SCA) were determined. There was extensive genetic variability among hybrids with the best hybrids (HS 04 x 10 and HS 10 x 11) not differing from the commercial checks. The lines with the greatest potential for hybrid synthesis included: L 10, L 11 and L 13, because they had higher GCA for yield, moderate resistance to P. maydis and reduced EH. The greatest contribution to reduction of the Phaeosphaeria stain was obtained with L 5. The magnitude of the GCA relative to the total variation indicated that additive effects predominated for resistance to P. maydis and P. polysora. Significant SCA (P < 0.01) was also found, indicating dominance effects as well.

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