American Potato Journal

, Volume 59, Issue 1, pp 1–8 | Cite as

Nonpathogenic bacteria associated with potato stems cross-react withCorynebacterium sepedonicum antisera in immunofluorescence

  • C. F. Crowley
  • S. H. De Boer


Forty-three and 16% of stem smears from ostensibly healthy potato plants tested in 1980 and 1981, respectively, by immunofluorescence usingCorynebacterium sepedonicum antisera, had fluorescing bacterial cells. Eight different bacteria that cross-reacted withC. sepedonicum antisera in immunofluorescence were isolated from stems. Four of these bacteria were Gram negative, three were Gram positive, and one was Gram variable. All bacteria differed fromC. sepedonicum in morphological and biochemical characteristics except the Gram variable bacteria which were morphologically similar toC. sepedonicum at some growth stages. None of the cross-reacting bacteria was pathogenic on eggplant (Solanum melongena L. cv. Black Beauty). Three of the bacteria also formed precipitin bands in double diffusion withC. sepedonicum antiserum. Adsorption of antiserum with any one of the cross-reacting bacteria did not prevent immunofluorescence staining of all the isolated strains. Due to the cross-reactions, reliability of immunofluorescence for detection of latent bacterial ring rot infection was limited

Key Words

Bacterial ring rot Corynebacterium sepedonicum immunofluorescence crossreaction indirect fluorescent antibody stain 


Cuarenta y tres y 16% de los frotis de tallos provenientes de plantas sanas de papas probados en 1980 y 1981, respectivamente, por medio de immunofluorescencia usando antisuero deCorynebacterium sepedonicum presentaron células bacterianas fluorescentes. Ocho diferentes bacterias que reaccionaron con antisuero deC. sepedonicum en immunofluorescencia fueron aisladas de los tallos. Cuatro de estas bacterias fueron Gram positivo, tres fueron Gram negativo y una fue Gram variable. Todas estas bacterias fueron diferentes deC. sepedonicum en sus características morfológicas y bioquímicas, excepto la Gram variable cuyas características morfológicas fueron similares a las deC. sepedonicum el algunos de sus estados de desarrollo. Ninguna de estas bacterias fue patogénica en berenjena (Solanum melongena L. cv. Black Beauty). Tres de estas bacterias también formaron bandas de precipitación en doble difusión con antisuero deC. sepedonicum. La absorción de antisuero por cualquiera de estas bacterias no previno el teñido por immunofluorescencia de todos los strains aislados. Debido a estas reacciones cruzadas, la confiabilidad de la immunofluorescencia para detectar infección latente de pudrición anular fue limitada


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Copyright information

© Springer 1982

Authors and Affiliations

  • C. F. Crowley
    • 1
  • S. H. De Boer
    • 2
  1. 1.B.C. Ministry of Agriculture and FoodVancouverCanada
  2. 2.Agriculture CanadaVancouverCanada

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