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Euphytica

, Volume 39, Supplement 3, pp 77–86 | Cite as

Resistance to late blight (Phytophthora infestans) in ten wild Solanum species

  • Colon L. T. 
  • Budding D. J. 
Article

Abstract

Nineteen accessions of the tuber-bearing species Solanum berthaultii, S. chacoense, S. leptophyes, S. microdontum, S. sparsipilum, S. sucrense, S. venturii, S. vernei and S. verrucosum were tested for their resistance to late blight in two years of field experiments. Plants were artifically inoculated with zoospores of race 1.2.3.4.5.7.10.11 and the development of the disease was followed. Resistance ratings, calculated as the areas under the disease progress curves (ADPC), demonstrated a high resistance in all accessions except in S. sparsipilum, S. leptophyes and their interspecific hybrid. Segregations suggest that major genes for resistance are present in S. sucrense and S. venturii, and may also play a role in S. verrucosum. It is not yet certain wether the resistance of the other accessions is comparable to the partial and durable resistance of S. tuberosum cultivars like Pimpernel, as inheritance and mechanism have yet to be established. However, segregations suggesting the presence of single major genes with complete dominance were not found in these other accessions. Tuber initiation in the field occurred in only one accession, S. tuberosum ssp. andigena, and maturity of the clones was not related to their resistance. In the other accessions maturity types could not be assessed, as the clones require short day conditions for tuber initiation.

Key words

Solanum potato Phytophthora infestans late blight hypersensitive resistance maturity non-race-specific resistance partial resistance 

Abbreviations

ADPC

area under the disease progress curve

BGRC

Braunschweig Genetic Resource Center

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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • Colon L. T. 
    • 1
  • Budding D. J. 
    • 1
  1. 1.Foundation for Agricultural Plant Breeding, SVPWageningenThe Netherlands

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