Potato Research

, Volume 43, Issue 3, pp 239–251 | Cite as

Identification of potato interspecific hybrids resistant toVerticillium wilt and determination of criteria for resistance assessment

  • S. H. Jansky
  • D. I. Rouse
Full Papers


Verticillium dahliae causes potato (Solanum tuberosum) early dying disease. Interspecific hybrids containingS. tuberosum, S. berthaultii, S. bukasovii, S. chacoense, S. gourlayi, S. sparsipilum andS. tarijense were identified with resistance toV. dahliae. Clones were grown in replicated trials for three years in a plot containing approximately 50 colony forming units (cfu)V. dahliae per g soil. Clones were evaluated for vine maturity, early dying symptoms and stem colonization. Five resistant 2x clones were identified with early maturity and low levels of stem colonization. A single maturity score and one disease score, each obtained in mid-August, were sufficient to distinguish among clones. An effective threshold level for considering a stem to be infected was determined to be 25 cfu/100 μl sap. Early dying symptoms did not correlate strongly with stem colonization. Numerous stems must be sampled when making resistance assessments. The average cfu/100 μl sap correlated strongly with the number of infected stems.

Additional keywords

disease resistance early dying disease Verticillium dahliae Solanum spp. 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • S. H. Jansky
    • 1
  • D. I. Rouse
    • 2
  1. 1.Department of BiologyUniversity of Wisconsin-Stevens PointStevens PointUSA
  2. 2.Department of Plant PathologyUniversity of Wisconsin-MadisonMadisonUSA

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