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

Estimates of combining ability and heritability in cowpea genotypes under drought stress and non-stress conditions in Uganda

Saul Eric Mwale
  • Saul Eric Mwale
  • Makerere University, School of Agricultural Sciences, P.O. Box 7062, Kampala, Uganda.
  • Google Scholar
Mildred Ochwo Ssemakula
  • Mildred Ochwo Ssemakula
  • Makerere University, School of Agricultural Sciences, P.O. Box 7062, Kampala, Uganda.
  • Google Scholar
Kassim Sadik
  • Kassim Sadik
  • National Agricultural Research Organization, P.O. Box 219, Arua, Uganda.
  • Google Scholar
Boris Alladassi
  • Boris Alladassi
  • Mzuzu University, Biological Sciences Department, Pvt Bag 201, Mzuzu, Malawi.
  • Google Scholar
Patrick Rubaihayo
  • Patrick Rubaihayo
  • Makerere University, School of Agricultural Sciences, P.O. Box 7062, Kampala, Uganda.
  • Google Scholar
Paul Gibson
  • Paul Gibson
  • Makerere University, School of Agricultural Sciences, P.O. Box 7062, Kampala, Uganda.
  • Google Scholar
Wales Singini
  • Wales Singini
  • Mzuzu University, Biological Sciences Department, Pvt Bag 201, Mzuzu, Malawi.
  • Google Scholar
Richard Edema
  • Richard Edema
  • Makerere University, School of Agricultural Sciences, P.O. Box 7062, Kampala, Uganda.
  • Google Scholar


  •  Received: 05 September 2016
  •  Accepted: 16 November 2016
  •  Published: 28 February 2017

Abstract

Cowpea is an important source of food and income for small scale farmers in Uganda. Production is, however, affected by both biotic and abiotic stresses. Drought stress has recently emerged as a serious concern due to the effects of climate change. This study was therefore undertaken to estimate the general and specific combining ability effects of parents and crosses as well as estimate the heritability of delayed leaf senescence, seed yield and its components under drought stress. Five drought tolerant genotypes were crossed with four drought sensitive genotypes in a North Carolina II mating design. The study revealed that drought tolerance is conditioned by both additive and non-additive genetic effects with the predominance of non-additive genetic effects for seed yield, 100 seed weight and number of pods per plant. Delayed leaf senescence was however, controlled by additive genetic effects, implying that progenies performance could be predicted from parents General Combining Ability (GCA) effects. The cultivars SECOW 5T, IT93K-452-1 and IT98K-205-8 were good combiners for drought tolerance. The F2 families: SECOW 3B x IT98K-205-8, SECOW 5T x IT98K-205-8, SECOW 4W x IT98K-205-8 and SECOW 1T x IT98K-205-8 had positive Specific Combining Ability(SCA) effects in seed yield, number of pods per plant and 100 seed weight, implying that they performed better than what was predicted by their parents GCA effect. As such, they are promising cross combinations that can be advanced for later generation selection.

Key words: Drought stress, combining ability, water use efficiency.