A Laboratory Assay for Phytophthora infestans Resistance in Various Solanum Species Reflects the Field Situation (original) (raw)

Abstract

Physiological and molecular research on resistance responses of Solanum tuberosum cultivars and partially resistant Solanum species to Phytophthora infestans requires a reliable resistance test that can be used in the laboratory. Laboratory tests performed on detached leaves and intact plants were compared with field tests for similarity of late blight reactions. Detached leaves from field-grown plants were as resistant as detached leaves from climate chamber-grown plants when challenged with P. infestans. However, detached leaves incubated in covered trays at high relative humidity were more susceptible than detached leaves kept in open trays or leaves on intact plants. The incubation conditions of detached leaves in covered trays rather than detachment itself appeared to affect the resistance expression. Detached leaves of some wild Solanum genotypes became partially infected, whereas intact plants were completely resistant when inoculated. Inoculation of leaves on intact plants, however, resulted in lower infection efficiencies. These limitations should be taken into account when choosing the appropriate inoculation method for specific purposes. For resistance screening, laboratory tests proved to be a good alternative for field tests. The ranking of resistance levels for twenty plant genotypes was similar under laboratory and field conditions.

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Authors and Affiliations

  1. DLO – Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands
    Vivianne G.A.A. Vleeshouwers, Willem van Dooijeweert, L.C. Paul Keizer, Luc Sijpkes & Leontine T. Colon
  2. Laboratory of Phytopathology, Wageningen Agricultural University, Binnenhaven 9, 6709 PD Wageningen, The Netherlands; Graduate School Experimental Plant Sciences, The Netherlands
    Vivianne G.A.A. Vleeshouwers & Francine Govers
  3. Graduate School Experimental Plant Sciences, The Netherlands (E-mail
    Vivianne G.A.A. Vleeshouwers

Authors

  1. Vivianne G.A.A. Vleeshouwers
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  2. Willem van Dooijeweert
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  3. L.C. Paul Keizer
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  4. Luc Sijpkes
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  5. Francine Govers
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  6. Leontine T. Colon
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Vleeshouwers, V.G., van Dooijeweert, W., Paul Keizer, L. et al. A Laboratory Assay for Phytophthora infestans Resistance in Various Solanum Species Reflects the Field Situation.European Journal of Plant Pathology 105, 241–250 (1999). https://doi.org/10.1023/A:1008710700363

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