Journal of Plant Breeding and Crop Science
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Article Number - 190D8FE55336


Vol.10(1), pp. 21-32 , January 2018
https://doi.org/10.5897/JPBCS2017.0698
ISSN: 2006-9758


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Full Length Research Paper

Inheritance of cowpea resistance to flower thrips in Uganda germplasm



Symphorien Agbahoungba
  • Symphorien Agbahoungba
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
  • Google Scholar
Jeninah Karungi
  • Jeninah Karungi
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
  • Google Scholar
Arfang Badji
  • Arfang Badji
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
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Kassim Sadik
  • Kassim Sadik
  • Abi-Zonal Agricultural Research and Development Institute, National Agricultural Research Organization, P. O. Box 219, Arua, Uganda.
  • Google Scholar
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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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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Achille E. Assogbadjo
  • Achille E. Assogbadjo
  • Laboratory of Applied Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 P. O. Box 526, Cotonou, Benin.
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Patrick R. Rubaihayo
  • Patrick R. Rubaihayo
  • Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda.
  • Google Scholar







 Received: 17 October 2017  Accepted: 07 December 2017  Published: 31 January 2018

Copyright © 2018 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Flower thrips [Megalurothrips sjostedti (Trybom)] is the most damaging insect pest on cowpea. However, information regarding the nature of gene action governing the inheritance of resistance to thrips is not available for cowpea genotypes in Uganda. This study was carried out to determine the inheritance pattern of cowpea resistance to flower thrips. Five resistant cowpea genotypes and three susceptible genotypes were crossed in full diallel mating design. F2 progenies were evaluated along with the parents in alpha lattice design with two replications under natural thrips infestation at Kabanyolo, Arua and Serere in Uganda. Combining ability analysis was performed using method one and model one of diallel analysis. The results showed that the environmental effects were highly significant (P<0.001). Additive, dominance and epistasis effects had major contributions. The broad sense heritability varied from 18 to 42% for thrips damage scores and from 0 to 6% for thrips counts. The estimates of narrow sense heritability were low for thrips damage score (2 to 18%) and thrips counts (0 to 9%). Genotypes TVU-1471 and TVU-1509 were identified as good transmitters of resistance to flower thrips. Crosses TVU-1509 x NE5, TVU-473 x Sanzi, TVU-123 x Sanzi, TVU-123 x TVU-473, and TVU-473 x TVU-1509 presented significant (P<0.05) and negative SCA effects for thrips damage scores and thrips counts and would be the most useful in breeding as some of their progenies would have high resistance to flower thrips. This study provides the basis of an efficient breeding program of cowpea for flower thrips resistance.

 

Key words: Damage score, gene action, Megalurothrips sjostedti, Vigna unguiculata.

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APA Agbahoungba, S., Karungi, J., Badji, A., Sadik, K., Gibson, P., Edema, R., Assogbadjo, A. E., & Rubaihayo, P. R. (2018). Inheritance of cowpea resistance to flower thrips in Uganda germplasm. Journal of Plant Breeding and Crop Science, 10(1), 21-32.
Chicago Symphorien Agbahoungba, Jeninah Karungi, Arfang Badji, Kassim Sadik, Paul Gibson, Richard Edema, Achille E. Assogbadjo and Patrick R. Rubaihayo. "Inheritance of cowpea resistance to flower thrips in Uganda germplasm." Journal of Plant Breeding and Crop Science 10, no. 1 (2018): 21-32.
MLA Symphorien Agbahoungba, et al. "Inheritance of cowpea resistance to flower thrips in Uganda germplasm." Journal of Plant Breeding and Crop Science 10.1 (2018): 21-32.
   
DOI https://doi.org/10.5897/JPBCS2017.0698
URL http://www.academicjournals.org/journal/JPBCS/article-abstract/190D8FE55336

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