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

Stability of resistance to cassava brown streak disease in major agro-ecologies of Uganda

Anthony Pariyo
  • Anthony Pariyo
  • National Crops Resources Research Institute (NaCRRI), P. O. Box 7084 Kampala, Uganda.
  • Google Scholar
Yona Baguma
  • Yona Baguma
  • National Crops Resources Research Institute (NaCRRI), P. O. Box 7084 Kampala, Uganda.
  • Google Scholar
Titus Alicai
  • Titus Alicai
  • National Crops Resources Research Institute (NaCRRI), P. O. Box 7084 Kampala, Uganda.
  • Google Scholar
Robert Kawuki
  • Robert Kawuki
  • National Crops Resources Research Institute (NaCRRI), P. O. Box 7084 Kampala, Uganda.
  • Google Scholar
Edward Kanju
  • Edward Kanju
  • International Institute of Tropical Agriculture (IITA), P. O. Box 34441, Dar-es-Salaam, Tanzania.
  • Google Scholar
Anton Bua
  • Anton Bua
  • National Crops Resources Research Institute (NaCRRI), P. O. Box 7084 Kampala, Uganda
  • Google Scholar
Christopher A. Omongo
  • Christopher A. Omongo
  • National Crops Resources Research Institute (NaCRRI), P. O. Box 7084 Kampala, Uganda.
  • Google Scholar
Paul Gibson
  • Paul Gibson
  • Makerere University, P. O. Box 7062 Kampala, Uganda.
  • Google Scholar
David S. Osiru
  • David S. Osiru
  • Makerere University, P. O. Box 7062 Kampala, Uganda.
  • Google Scholar
Dennis Mpairwe
  • Dennis Mpairwe
  • Makerere University, P. O. Box 7062 Kampala, Uganda.
  • Google Scholar
Phinehas Tukamuhabwa
  • Phinehas Tukamuhabwa
  • Makerere University, P. O. Box 7062 Kampala, Uganda.
  • Google Scholar


  •  Received: 21 November 2014
  •  Accepted: 19 January 2015
  •  Published: 01 March 2015

Abstract

Cassava brown streak disease (CBSD) is the most devastating disease of cassava in southern,   eastern and cntral Africa, and can cause up to 100% yield loss. Limited progress has been made in breeding for host plant resistance due to limited knowledge on the resistance variability to the disease. Reaction of promising cassava genotypes to CBSD in multi-environments are also unknown. Therefore, this study intended to: (1) Identify additional sources of resistance to CBSD; (2) Determine the stability of resistance to CBSD, and (3) mega-environments for screening resistance to CBSD. Field evaluation of 19 genotypes was conducted in RCBD with three replications at three agro-ecologies of Uganda for two cropping cycles. Additive Main Effects and Multiplicative Interaction (AMMI) and (GGE) biplot models were used to analyze genotype-environment interactions. Based on mean field reaction, the six best genotypes identified for resistance to CBSD were: TZ/06/140, TMS30572, TZ /06/130, N3/66/1, N3/58/1 with N3/104/3 and N3/66/1 being the most stable. While N3/66/1, N3/58/1 and N3/104/3, Mzungu and Kigoma Red were reported to be putative new sources of resistance to CBSD in Uganda. Genotypes (G), Environments (E), and GxE interactions were all significant, with no genotype exhibiting complete resistance. The significant result for GxE interaction to CBSD indicates the need for multi-environment screening and is suggestive of quantitative nature of CBSD resistance.

 

Key words: Cassava brown streak disease; resistance, GxE interaction, discriminatory ability.