Nonhost and basal resistance: how to explain specificity?

R.E. Niks, T.C. Marcel

Research output: Contribution to journalArticleAcademicpeer-review

123 Citations (Scopus)


Nonhost resistance to plant pathogens can be constitutive or induced by microbes. Successful pathogens suppress microbe-induced plant defences by delivering appropriate effectors, which are apparently not sufficiently effective on nonhost plant species, as can be concluded from the strong host specificity of many biotroph plant pathogens. Such effectors act on particular plant targets, such as promoters or motifs in expressed sequences. Despite much progress in the elucidation of the molecular aspects of nonhost resistance to plant pathogens, very little is known about the genes that determine whether effectors can or cannot suppress the basal defence. In hosts they can, in nonhosts they cannot. The targets determining the host status of plants can be identified in inheritance studies. Recent reports have indicated that nonhost resistance is inherited polygenically, and exhibits strong similarity and association with the basal resistance of plants to adapted pathogens
Original languageEnglish
Pages (from-to)817-828
JournalNew Phytologist
Issue number4
Publication statusPublished - 2009


  • powdery mildew resistance
  • quantitative disease resistance
  • genes conferring resistance
  • fungus magnaporthe-grisea
  • candidate defense genes
  • heterologous rust fungi
  • near-isogenic lines
  • wheat stripe rust
  • pv. tomato dc3000
  • plant-cell wall


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