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Identification and Characterisation of Xanthomonas campestris pv. campestris Strains from Tanzania by Pathogenicity Tests, Biolog, rep-PCR and Fatty Acid Methyl Ester Analysis

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Abstract

Black rot, caused by Xanthomonas campestris pv. campestris (Xcc), is a major disease constraint to cabbage production by smallholder farmers in Africa. Variability exists within the pathogen, and yet differentiation of Xcc strains from other closely-related xanthomonads attacking crucifers is often difficult. The Biolog system, fatty acid methyl ester analysis using microbial identification system (MIS), rep-PCR and pathogenicity tests were used to identify and characterise Xcc strains from Tanzania. Great diversity was observed among Xcc strains in their Biolog and rep-PCR profiles. Specific rep-PCR genomic fingerprints were linked to some geographical areas in the country. Most of the Xcc strains were clustered in two groups based on their fatty acid profiles and symptom expression in cabbage although some deviant strains were found. Each of the methods allowed a degree of identification from species, pathovar to the strain level. Biolog and MIS identified all Xcc strains at least to the genus level. Additionally, Biolog identified 47% of Xcc strains to the pathovar and 43% to strain level, whereas MIS identified 43% of the strains to pathovar level. In the absence of a database, the utility of rep-PCR for routine diagnosis of strains was limited, although the procedure was good for delineation of Xcc to the strain level. These findings indicate the existence of Xcc strains in Tanzania that are distinct from those included in Biolog and MIS databases. The limitations noticed warrant continued improvement of databases and inclusion of pathogenicity testing, using universally susceptible cultivars, as an integral part of strain identification.

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Authors and Affiliations

  1. Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark

    Said M.S. Massomo & John Hockenhull

  2. Danish Government Institute of Seed Pathology for Developing Countries, Thorvaldsensvej 57, DK-1871, Frederiksberg C., Denmark

    Said M.S. Massomo, Hanne Nielsen & Carmen N. Mortensen

  3. Sokoine University of Agriculture, P.O. Box 3005, Morogoro, Tanzania

    Robert B. Mabagala

  4. Research Centre Flakkebjerg, Danish Institute of Agricultural Sciences, DK-4200, Slagelse, Denmark

    Keld Mansfeld-Giese

Authors
  1. Said M.S. Massomo
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  2. Hanne Nielsen
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  3. Robert B. Mabagala
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  4. Keld Mansfeld-Giese
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  5. John Hockenhull
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  6. Carmen N. Mortensen
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Correspondence to Carmen N. Mortensen.

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Massomo, S.M., Nielsen, H., Mabagala, R.B. et al. Identification and Characterisation of Xanthomonas campestris pv. campestris Strains from Tanzania by Pathogenicity Tests, Biolog, rep-PCR and Fatty Acid Methyl Ester Analysis. European Journal of Plant Pathology 109, 775–789 (2003). https://doi.org/10.1023/A:1026194402701

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