Screening lettuce germplasm for new sources of resistance to corky root

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Corky root is a major disease of lettuce (Lactuca sativa L.) observed in many production areas of the world. The pathogen Sphingomonas suberifaciens (van Bruggen et al.) Yabuuchi et al. varies with regard to virulence, and several strains have been isolated that can cause disease symptoms even on cultivars that have the only known resistance gene, cor. It is desirable to find new sources of resistance to diversify the genetic basis of the resistance and to confer resistance against isolates that are not adequately controlled by cor. More than 1000 plant introduction lines and cultivars were screened in assays conducted in the greenhouse, growth chamber, and field. Three L. serriola L. lines (PI 491239, PI 491096, and PI 491110) and a L. virosa L. line (PI 273597c) were highly resistant to corky root in all tests. Disease severity ratings in the field were correlated with the ratings in the greenhouse (r = 0.722) and in the growth chamber (r = 0.650). Significant genotype x environment interactions were observed for corky root severity. None of the four resistant lines had the two molecular markers closely linked to the cor allele. The information on disease resistance for these genotypes will be useful in future breeding work.

Original languageEnglish (US)
Pages (from-to)712-716
Number of pages5
JournalJournal of the American Society for Horticultural Science
Volume129
Issue number5
StatePublished - Sep 1 2004

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Lettuce
growth chambers
lettuce
Sphingomonas suberifaciens
germplasm
screening
greenhouses
genotype
Lactuca sativa
cultivars
introduced plants
Genotype
Sphingomonas
disease severity
signs and symptoms (plants)
disease resistance
Disease Resistance
virulence
Growth
alleles

All Science Journal Classification (ASJC) codes

  • Genetics
  • Horticulture

Cite this

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title = "Screening lettuce germplasm for new sources of resistance to corky root",
abstract = "Corky root is a major disease of lettuce (Lactuca sativa L.) observed in many production areas of the world. The pathogen Sphingomonas suberifaciens (van Bruggen et al.) Yabuuchi et al. varies with regard to virulence, and several strains have been isolated that can cause disease symptoms even on cultivars that have the only known resistance gene, cor. It is desirable to find new sources of resistance to diversify the genetic basis of the resistance and to confer resistance against isolates that are not adequately controlled by cor. More than 1000 plant introduction lines and cultivars were screened in assays conducted in the greenhouse, growth chamber, and field. Three L. serriola L. lines (PI 491239, PI 491096, and PI 491110) and a L. virosa L. line (PI 273597c) were highly resistant to corky root in all tests. Disease severity ratings in the field were correlated with the ratings in the greenhouse (r = 0.722) and in the growth chamber (r = 0.650). Significant genotype x environment interactions were observed for corky root severity. None of the four resistant lines had the two molecular markers closely linked to the cor allele. The information on disease resistance for these genotypes will be useful in future breeding work.",
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Screening lettuce germplasm for new sources of resistance to corky root. / Mou, Beiquan; Bull, Carolee Theresa.

In: Journal of the American Society for Horticultural Science, Vol. 129, No. 5, 01.09.2004, p. 712-716.

Research output: Contribution to journalArticle

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