Journal Article

A Laboratory Assay for Phytophthora infestans Resistance in Various Solanum Species Reflects the Field Situation

Sijpkes, Luc, van Dooijeweert, Willem, Colon, Leontine T., Vleeshouwers, Vivianne G.A.A., Govers, Francine, Paul Keizer, L.C.

1999

Overview

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.

• Publisher: Springer,Springer Nature B.V
• Subject: Agronomy. Soil science and plant productions / bioassays / Biological and medical sciences / Cultivars / disease resistance / EPS / field experimentation / Field study / Field tests / Fundamental and applied biological sciences. Psychology / Genetics and breeding of economic plants / genotype / Genotypes / Immunization / interspecific variation / Laboratorium voor Fytopathologie / Laboratorium voor Phytopathologie / Laboratory of Phytopathology / Laboratory tests / Leaves / Netherlands / Pest resistance / Phytophthora infestans / Plant pathogens / Plant Research International / Plants / Relative humidity / Solanum / tissue culture / Varietal selection. Specialized plant breeding, plant breeding aims / wild relatives