African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6894

Full Length Research Paper

Genetic gain prediction in coffee progenies derived from the cross between ‘Híbrido de Timor’ and ‘Catuaí’ cultivars

Ramiro Machado Rezende
  • Ramiro Machado Rezende
  • Vale do Rio Verde University, Agronomic Course, Av. Castelo Branco, 82, Chácara das Rosas, CEP 37410-000 Três Corações, MG, Brazil.
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Juliana Costa de Rezende
  • Juliana Costa de Rezende
  • Agricultural Research Corporation of Minas Gerais, Epamig Unidade Regional do Sul de Minas, Campus da Ufla, s/n°, P. O. Box 176, CEP 37200-000 Lavras, MG Brazil.
  • Google Scholar
Gladyston Rodrigues Carvalho
  • Gladyston Rodrigues Carvalho
  • Agricultural Research Corporation of Minas Gerais, Epamig Unidade Regional do Sul de Minas, Campus da Ufla, s/n°, P. O. Box 176, CEP 37200-000 Lavras, MG Brazil.
  • Google Scholar
Cesar Elias Botelho
  • Cesar Elias Botelho
  • Agricultural Research Corporation of Minas Gerais, Epamig Unidade Regional do Sul de Minas, Campus da Ufla, s/n°, P. O. Box 176, CEP 37200-000 Lavras, MG Brazil.
  • Google Scholar
Sonia Maria de Lima Salgado
  • Sonia Maria de Lima Salgado
  • Agricultural Research Corporation of Minas Gerais, Epamig Unidade Regional do Sul de Minas, Campus da Ufla, s/n°, P. O. Box 176, CEP 37200-000 Lavras, MG Brazil.
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Andre Dominghetti Ferreira
  • Andre Dominghetti Ferreira
  • Brazilian Agricultural Research Corporation Embrapa Gado de Corte, Av. Rádio Maia, 830, CEP 79106-550 Campo Grande, MS. Brazil.
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  •  Received: 22 April 2015
  •  Accepted: 06 October 2015
  •  Published: 12 November 2015

Abstract

The objective of this study was to estimate genetic parameters and predict the genetic gains of coffee plant progenies using characters that are targeted in coffee breeding. The experiment was conducted in an area naturally infested with Meloidogyne exigua on Ouro Verde Farm, which is located in the municipality of Campos Altos in the state of Minas Gerais- Brazil. Twenty-three progenies that were potentially resistant to root-knot nematodes were used in the study, and seven commercial cultivars were used as controls. The evaluated progenies are in the fourth generation of a cross between ‘Híbrido de Timor’ and ‘Catuaí’, and they were provided by the coffee plant-breeding program conducted in Minas Gerais. The following characters were evaluated in the 2010 to 2011 and 2011 to 2012 crops: Productivity per processed coffee bags per hectare; percentage of grains at the berry stage; percentage of floating grains; grains size; and plant vigor. Furthermore, the number of M. exigua eggs per root gram was evaluated in the latter crop. The following genetic parameters were evaluated: Coefficient of environmental variation; phenotypic variance; genotypic variance; broad sense heritability; coefficient of genetic variation; and variation index. Gains by direct and indirect selection and the selection index, based on the sum of ranks of Mulamba and Mock, were used to estimate the genetic gain prediction. The progenies exhibited large genetic variability for the assessed traits. The index based on the sum of ranks presented higher simultaneous gains in relation to direct and indirect selection. The progenies (H493-1-2-2, H514-7-4-5, H518-2-10-1, and 514-5-2-4) were the most promising in the area infested by M. exigua and were identified for generational advancement based on the two procedures of analytical gain prediction.

 

Key words: Coffea arabica, selection index, breeding.