Qualitative and quantitative resistance against early blight introgressed in potato

Pieter J. Wolters, Doret Wouters, Emil J. Kromhout, Dirk Jan Huigen, Richard G.F. Visser, Vivianne G.A.A. Vleeshouwers*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)


Early blight is a disease of potato that is caused by Alternaria species, notably A. solani. The disease is usually controlled with fungicides. However, A. solani is developing resistance against fungicides, and potato cultivars with genetic resistance to early blight are currently not available. Here, we identify two wild potato species, which are both crossable with cultivated potato (Solanum tuberosum), that show promising resistance against early blight disease. The cross between resistant S. berthaultii and a susceptible diploid S. tuberosum gave rise to a population in which resistance was inherited quantitatively. S. commersonii subsp. malmeanum was also crossed with diploid S. tuberosum, despite a differing endosperm balance number. This cross resulted in triploid progeny in which resistance was inherited dominantly. This is somewhat surprising, as resistance against necrotrophic plant pathogens is usually a quantitative trait or inherited recessively according to the inverse-gene-for-gene model. Hybrids with high levels of resistance to early blight are present among progeny from S. berthaultii as well as S. commersonii subsp. malmeanum, which is an important step towards the development of a cultivar with natural resistance to early blight.

Original languageEnglish
Article number892
Issue number9
Publication statusPublished - Sep 2021


  • Alternaria solani
  • Endosperm balance number (EBN)
  • Hybrid vigour
  • Interspecific hybrids
  • Necrotroph
  • S. berthaultii
  • S. commersonii subsp. malmeanum
  • S. tuberosum
  • Solanum


Dive into the research topics of 'Qualitative and quantitative resistance against early blight introgressed in potato'. Together they form a unique fingerprint.

Cite this