Journal of
Plant Breeding and Crop Science

  • Abbreviation: J. Plant Breed. Crop Sci.
  • Language: English
  • ISSN: 2006-9758
  • DOI: 10.5897/JPBCS
  • Start Year: 2009
  • Published Articles: 330

Full Length Research Paper

Genetic inheritance of resistance to Fusarium redolens in cowpea

Namasaka Roy Wanjala
  • Namasaka Roy Wanjala
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Geoffrey Tusiime
  • Geoffrey Tusiime
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Orawu Martin
  • Orawu Martin
  • National Semi-Arid Resources Research Institute (NaSARRI), P. O. Box 56, Soroti, Uganda.
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Paul Gibson
  • Paul Gibson
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Symphorien Agbahoungba
  • Symphorien Agbahoungba
  • Laboratory of Applied Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, P. O. Box 526, Cotonou, Benin.
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Alladassi Mahule Elyse Boris
  • Alladassi Mahule Elyse Boris
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Richard Edema
  • Richard Edema
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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  •  Received: 14 July 2017
  •  Accepted: 18 August 2017
  •  Published: 31 October 2017

Abstract

Fusarium related root rots have been associated with reduced cowpea productivity in Uganda. Sources of genetic resistance to Fusarium redolens which was found to be the most virulent have been identified but the mode of inheritance of the genes conferring the resistance is unknown. This study aims to investigate how the genes for resistance to F. redolens are inherited in cowpea. Four F. redolens root rot resistant cowpea genotypes were crossed with four intermediately resistant and 2 susceptible cowpea genotypes using North Carolina mating design II. The F1 and the parents were evaluated and data were collected on resistance to seed rot, leaf chlorophyll amount, produced lateral roots, response to plant mortality and root rot severity. Results revealed that additive gene effects were significant for all evaluated traits and non-additive genetic effects were significant in resistance to seed rot and chlorophyll amount. General combining ability (GCA) effects showed that the Asontem genotype was a good combiner for increased lateral roots production and resistance to root rot. Degree of dominance estimates revealed that response to plant mortality, root rots and increased lateral root production traits were recessively inherited while seed rot and amount of leaf chlorophyll were dominantly inherited.

Key words:  Vigna unguiculata, Baker’s ratio, combining ability, Fusarium redolens, heritability, Uganda.