Archives of Microbiology

, Volume 140, Issue 4, pp 347–351 | Cite as

Relationships between rhizoplane and rhizosphere bacteria and verticillium wilt resistance in potato

  • H. R. Azad
  • J. R. Davis
  • W. C. Schnathorst
  • C. I. Kado
Original Papers


Six cultivars and breeding lines of potato (Solanum tuberosum) differing in susceptibility to verticillium wilt caused by Verticillium dahliae were studied with respect to quantitative and qualitative differences in the bacterial flora of their soil and rhizosphere-rhizoplane. Although, no association was observed between the types of bacteria that inhabited the soil or roots of wilt resistant and susceptible cultivars, quantitative differences were evident. These differences provide the first direct evidence that potato genotypes can influence bacterial populations. Bacterial populations were 9–25-fold higher on roots than in the adjacent soil. As the plants aged, the total number of rootcolonizing bacteria increased between 15 and 245%. Pseudomonas spp. were the most abundant microbes in the soil and rhizosphere-rhizoplane. The bacteria antagonistic to V. dahliae in vitro were identified as members of the genera Bacillus, Pseudomonas, Flavobacterium, and Gluconobacter. A statistically significant trend was evident toward the association of antagonistic bacteria with the more resistant potato cultivars.

Key words

Bacteria Antagonists Verticillium dahliae Potato cultivars Resistance Populations Quantitative Qualitative-Roots Soil 


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • H. R. Azad
    • 1
  • J. R. Davis
    • 2
  • W. C. Schnathorst
    • 1
    • 3
  • C. I. Kado
    • 1
  1. 1.Davis Crown Gall GroupUniversity of CaliforniaDavisUSA
  2. 2.Idaho Research and Extension CenterUniversity of IdahoAberdeenUSA
  3. 3.USDA, ARS. Department of Plant PathologyUniversity of CaliforniaDavisUSA

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