African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6165

Full Length Research Paper

Prediction of genetic gain using selection indices in maize lines

Silviane de Santiago
  • Silviane de Santiago
  • Departament of Vegetal Production, Paulista State University, UNESP – Jaboticabal/SP, Brazil.
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Claudio Lopes de Souza Junior
  • Claudio Lopes de Souza Junior
  • Departament of Genetic, University of São Paulo” – ESALQ/USP, Piracicaba/SP, Brazil.
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Leandro Borges Lemos
  • Leandro Borges Lemos
  • Departament of Vegetal Production, Paulista State University, UNESP – Jaboticabal/SP, Brazil.
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Gustavo Vitti Môro
  • Gustavo Vitti Môro
  • Departament of Vegetal Production, Paulista State University, UNESP – Jaboticabal/SP, Brazil.
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  •  Received: 30 November 2015
  •  Accepted: 04 January 2019
  •  Published: 25 April 2019

Abstract

Maize is an important cereal crop in scientific research area and the world economy, where Brazil is one of the leading producers. High production and productivity are partly due to plant breeding programs, where the selection of superior genotypes is based on indexes. This strategy has been very efficient o obtaining superior genotypes since there are simultaneous gains for various agronomic and economic characters. The aim of the research was to measure genetic gain through inbred selection based on the selection index, as well to compare the efficiency of the different index in order to verify which one is more recommended to a phenotypic selection of maize inbreeds. To achieve this, 256 inbreeds were experimentally evaluated in 12 environments. The characters evaluated were grain yield, fecundity, lodging and breaking plant, plant height, ear height, relative position of the ear, male and female flowering and the flowering interval. Selection intensities of 10 and 20% were applied in the direct selection in seven study indexes. The analysis showed that the direct selection of the characters was not effective for the selection of superior maize genotypes. and the Smith and Hazel's index and Williams's index got higher gains yield for the genotypes evaluated.

Key words: direct selection, obtaining hybrids, pure lines, Zea may L.