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Research article - Peer-reviewed, 2018

Late Blight Resistance Screening of Major Wild Swedish Solanum Species: S. dulcamara, S. nigrum, and S. physalifolium

Abreha, Kibrom B.; Lankinen, Asa; Masini, Laura; Hydbom, Sofia; Andreasson, Erik

Abstract

To understand the contribution of wild Solanum species to the epidemiology of potato late blight in Sweden, we characterized the resistance of the three putative alternative hosts: S. physalifolium, S. nigrum, and S. dulcamara to Phytophthora infestans, the causal agent of late blight. The pathogen sporulated in all 10 investigated S. physalifolium genotypes, suggesting susceptibility (S phenotype). Field-grown S. physalifolium was naturally infected but could regrow, though highly infected genotypes were smaller at the end of the season. In 75 S. nigrum genotypes, there were no symptoms (R phenotype) or a lesion restricted to the point of inoculation (RN phenotype), indicating resistance. In 164 S. dulcamara genotypes, most resistance variability was found within sibling groups. In addition to the three resistance phenotypes (R, RN, and S), in S. dulcamara a fourth new resistance phenotype (SL) was identified with lesions larger than the point of inoculation but without visible sporulation of the pathogen. Quantitative PCR confirmed P. infestans growth difference in RN, SL, and S phenotypes. Thus, in Sweden S. physalifolium is susceptible and could be a player in epidemiology. A limited role of S. dulcamara leaves in the epidemiology of late blight was suggested, since no major symptoms have been found in the field.

Published in

Phytopathology
2018, volume: 108, number: 7, pages: 847-857
Publisher: AMER PHYTOPATHOLOGICAL SOC

Authors' information

Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Masini, Laura
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Hydbom, Sofia
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology

Associated SLU-program

SLU Network Plant Protection

UKÄ Subject classification

Agricultural Science

Publication Identifiers

DOI: https://doi.org/10.1094/PHYTO-10-17-0355-R

URI (permanent link to this page)

https://res.slu.se/id/publ/95983