Breeding potential of maize composite Isanão VF1 in small spacing in the second growing season

The purpose of this study was to verify the breeding potential of the maize composite Isanão VF1 in the secondgrowing season. One hundred and fifty half-sib progenies were evaluated at spacing of 0.45 m, densities of 57,778 and 80,000plants ha-1, in a randomized block design with three replications....

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Bibliographic Details
Published in:Crop breeding and applied biotechnology 2008, Vol.8 (1), p.56-64
Main Authors: Candido, L.S., Andrade, J.A.C.
Format: Article
Language:English
Subjects:
Corn
genetic parameters
genetic variation
Growing season
plant arrangement
Plant breeding
sowing density
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Summary:The purpose of this study was to verify the breeding potential of the maize composite Isanão VF1 in the secondgrowing season. One hundred and fifty half-sib progenies were evaluated at spacing of 0.45 m, densities of 57,778 and 80,000plants ha-1, in a randomized block design with three replications. Gains of 16.0 and 19.2% were estimated for grain yield, 11.1and 10.5% for prolificacy and 12.3 and 12.9% for ear height, respectively, at 57,778 and 80,000 plants ha-1. The heritabilitiesfor plant height, ear height and grain yield were 65.2 and 61.3%, 64.3 and 66.9% and 53.5 and 63.3%, respectively,confirming the potential for breeding at both densities. The absence of progeny by density interaction indicates that no furtherselection programs are necessary. The occurrence of segregation for modifier genes for height suggests stabilizing selectionbased on ear height.
ISSN:1984-7033
1518-7853
1984-7033
DOI:10.12702/1984-7033.v08n01a08