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: 409

Full Length Research Paper

Inheritance of resistance to common bacterial blight in four selected common bean (Phaseolus vulgaris L.) genotypes

Boris M. E. Alladassi
  • Boris M. E. Alladassi
  • College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda
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Stanley T. Nkalubo
  • Stanley T. Nkalubo
  • National Crops Resources Research Institute (NaCRRI), Namulonge, P. O. Box 7084 Kampala, Uganda
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Clare Mukankusi
  • Clare Mukankusi
  • nternational Centre for Tropical Agriculture (CIAT), Kampala, Uganda.
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Eric S.Mwale
  • Eric S.Mwale
  • College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda
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Paul Gibson
  • Paul Gibson
  • College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda
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Richard Edema
  • Richard Edema
  • College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda
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Carlos A. Urrea
  • Carlos A. Urrea
  • University of Nebraska, Panhandle Research & Extension Center, 4502 Ave. I, Scottsbluff, NE 69361 USA
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James D. Kelly
  • James D. Kelly
  • Department of Plant, Michigan State University, Soil and Microbial Sciences, 1066 Bogue St., Room A370, East Lansing, MI 48824 USA
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Patrick R. Rubaihayo
  • Patrick R. Rubaihayo
  • College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda
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  •  Received: 07 February 2017
  •  Accepted: 03 May 2017
  •  Published: 30 June 2017

Abstract

Common bacterial blight (CBB) is the most serious bacterial disease of common bean in Uganda. It causes severe yield losses of up to 62%. Genetic resistance is the most effective option for controlling CBB in smallholder common bean production systems. This study was carried out to determine the inheritance pattern of CBB resistance in leaf and pod of four new resistance sources. The four resistant and four susceptible genotypes were crossed in a half-diallel mating design. F1 individuals were advanced to F2 and evaluated with the parents, in a randomized complete block design replicated twice. Combining ability analysis was performed according to Griffing's (1956) method IV and model 1 using Genstat 12th. General combining ability effects were significant whereas specific combining ability was not suggesting that resistance to CBB in leaf and pod was primarily controlled by additive genes effects. The estimated narrow sense coefficient of genetic determination was moderately high (0.65) for the resistance in leaf and high (0.83) for resistance in pod suggesting that early-generation selection would be effective. Baker’s ratio estimates were relatively high for resistance in leaf (0.79) and pod (0.9) suggesting that hybrids’ performance can be predicted based on the parents’ general combining ability (GCA) effects.

 

Key words: Xanthomonas axonopodis pv. phaseoli, general combining ability, additive gene effects, coefficient of genetic determination.