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

Genetics of drought tolerance in common bean genotypes adapted to Ugandan conditions

Winnyfred Amongi
  • Winnyfred Amongi
  • International Centre for Tropical Agriculture, National Agricultural Research Laboratories, Kawanda, P. O. Box 6247, Kampala, Uganda.
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Stanley Tamusange Nkalubo
  • Stanley Tamusange Nkalubo
  • National Crops Resources Research Institute (NaCRRI-NARO), P. O. Box 7084, Kampala, Uganda.
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Paul Gibson
  • Paul Gibson
  • School of Agricultural Sciences, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Richard Edema
  • Richard Edema
  • School of Agricultural Sciences, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Mildred Ochwo-Ssemakula
  • Mildred Ochwo-Ssemakula
  • School of Agricultural Sciences, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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  •  Received: 28 May 2014
  •  Accepted: 22 September 2014
  •  Published: 01 January 2015

Abstract

Common bean (Phaseolus vulgaris L.) is an important source of food and income for majority of households in Sub-Saharan Africa. However, bean production in Uganda is being affected by drought which has resulted from recent changes in climate. Developing high-yielding and drought-tolerant bean cultivars would significantly contribute to increased and stable yields in drought-prone environments. However, prior research was not focused on breeding for drought tolerance in bean in Uganda. Thus, this study sought to elucidate the genetics governing the inheritance of drought tolerance in Ugandan bean genotypes, through establishing the mechanism of inheritance of this trait in the genotypes relevant to Uganda. Five drought-tolerant and three drought-sensitive genotypes were hybridized using a NCII mating design. The findings of the study indicated that drought tolerance is controlled by both additive and non-additive gene action with more predominance of additive gene effects for seed yield, pod weight, seed and pod and number. Further findings also revealed that the genotypes SEN 99 and NABE 15 are good combiners for drought tolerance.

 

Key words: Phaseolus vulgaris, drought, screening, combining ability, inheritance.