Resistance to Bremia lactucae in natural populations of Lactuca saligna from some Middle Eastern countries and France

I. Petrželová, A. Lebeda, A. Beharav

Research output: Contribution to journalArticlepeer-review


The results of the first detailed screening of a resistance to Bremia lactucae in naturally growing populations of Lactuca saligna are presented here. In total, 146 accessions from 25 populations of L. saligna originating in Israel (N = 136), France (N = 8), Jordan (N = 1) and Turkey (N = 1) were tested at seedling stage for their resistance to 10 highly virulent isolates (races) of B. lactucae from Lactuca sativa (DEG2, Bl:5, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:24 and Bl:25). Our study strongly supports the suggestion that L. saligna is indeed generally highly resistant to B. lactucae. However, our results provide evidence that at least at a seedling stage L. saligna may not be a non-host plant for B. lactucae, as was hypothesised for approximately the last 30 years. Some accessions expressed a differential (i.e. race-specific) response, which accords with other recently published data for this Lactuca species. Furthermore, some geographical differences in race-specific resistance were observed, too. Tests performed at an adult-plant stage, however, did not prove race-specificity of the respective accessions. To summarise, what is behind the race-specific character of the responses observed at a seedling stage is still uncertain, as is its comparability with the race-specific resistance of some other Lactuca species such as L. sativa or L. serriola. The presence of plant stage-dependent resistance, governed by a combined effect of different quantitative trait loci in young and adult plants of L. saligna, is discussed.

Original languageEnglish
Pages (from-to)442-455
Number of pages14
JournalAnnals of Applied Biology
Issue number3
StatePublished - Nov 2011


  • Israel
  • Lettuce downy mildew
  • degree of infection
  • disease severity
  • least lettuce
  • non-host resistance
  • race-specific resistance
  • stage-dependent resistance

ASJC Scopus subject areas

  • Agronomy and Crop Science


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