African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5233

Full Length Research Paper

Resistance of Xanthomonas campestris pv. vesicatoria isolates from Tanzania to copper and implications for bacterial spot management

Kenneth C. Shenge*
  • Kenneth C. Shenge*
  • 1. The Ohio State University, OARDC Food Animal Health Research Program, 1680 Madison Avenue, Wooster, OH 44691, USA; 5. Department of Crop Protection, Faculty of Agriculture/Institute of Agricultural Research, Ahmadu Bello University, Zaria, Nigeria.
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Robert B. Mabagala
  • Robert B. Mabagala
  • Department of Crop Science and Production, Sokoine University of Agriculture, P.O. Box 3005, Morogoro, Tanzania
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Carmen N. Mortensen
  • Carmen N. Mortensen
  • Danish Seed Health Centre for Developing Countries, Department of Plant Biology, Plant Pathology Section, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, Frederiksberg C, DK-1871, Copenhagen, Denmark
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Kerstin Wydra
  • Kerstin Wydra
  • Georg-August-University Göttingen, Centre for Tropical and Subtropical Agriculture and Forestry (CeTSAF), Buesgenweg 1, D-37077 Gottingen, Germany
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  •  Received: 18 May 2013
  •  Accepted: 10 March 2014
  •  Published: 23 July 2014

Abstract

Thirty isolates of Xanthomonas campestris pv. vesicatoria (Xcv) from Tanzania were evaluated for sensitivity to copper sulphate (CuSO4:5H20) using dilution plate counts. Ninety-three percent (28/30) of the isolates produced countable colonies on nutrient glucose agar amended with 0.8 mM CuSO4. All the Xcv isolates (7/7) from Arusha (northern Tanzania) grew on the copper medium. Isolates of the pathogen from Iringa (southern Tanzania) produced variable results (15/21). However, neither of the two Xcv isolates from Morogoro (Eastern Tanzania) grew on the copper medium. These results indicate long-term exposure of Xcv isolates from Tanzania to selection pressure for copper tolerance.
 
Key words: Xanthomonas campestris pv. vesicatoria, copper resistance, Tanzania.

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