African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12257

Full Length Research Paper

Genetic diversity for immature pod traits in Ethiopian cowpea [Vigna unguiculata (L.) Walp.] landrace collections

Selamawit Ketema Ashinie
  • Selamawit Ketema Ashinie
  • Ethiopian Institute of Agricultural Research, Melkassa Research Center, P. O. Box 436, Adama, Ethiopia.
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Bizuayehu Tesfaye
  • Bizuayehu Tesfaye
  • School of Plant and Horticultural Science, Hawassa University, P. O. Box 05, Hawassa, Ethiopia.
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Gemechu Keneni Wakeyo
  • Gemechu Keneni Wakeyo
  • Ethiopian Institute of Agricultural Research, P. O. Box 2003, Addis Ababa, Ethiopia.
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Berhanu Amsalu Fenta
  • Berhanu Amsalu Fenta
  • Ethiopian Institute of Agricultural Research, Melkassa Research Center, P. O. Box 436, Adama, Ethiopia.
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  •  Received: 17 February 2020
  •  Accepted: 09 March 2020
  •  Published: 30 April 2020

Abstract

This study was undertaken to evaluate the extent and pattern of genetic diversity for immature pod traits in Ethiopia cowpea landrace collections. Eighty one landraces and improved cultivars were tested in a 9 x 9 simple lattice design. Analysis of variance revealed highly significant (P<0.01) or significant (p<0.05) differences among the genotypes for all traits. The first four principal components were able to explain 81% of variation for quantitative traits and 76% for qualitative traits. The genotypes were grouped into three distinct clusters, the first, second and third clusters with 60, 15 and 25% of the genotypes in that order. The landraces were distributed all over the clusters while the improved cultivars were absent in the second cluster. Shannon-Weaver diversity indices also showed existence of adequate genetic variability among the genotypes for qualitative traits.  Shannon-Weaver diversity indices ranged from the lowest of 0.50 for pod curvature to the highest of 0.99 for pod shape. The study clearly showed that, even if the genotypes were classified into a few cluster, there was adequate divergence among the clusters showing existence of considerable genetic variability for immature pod traits for exploitation in future breeding for better green pod yield and quality in cowpea.

 

Key words: Cowpea, diversity, genotypes, immature pod, qualitative traits, quantitative trait.