Differential interactions between strains of rhizorhapis, sphingobium, sphingopyxis or rhizorhabdus and accessions of Lactuca spp. with respect to severity of corky root disease

A. H C van Bruggen, O. Ochoac, I. M. Francis, Richard W Michelmore

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Over 100 isolates of Rhizorhapis suberifaciens, Sphingobium (Sb.) sp., Sb. mellinum, Sb. xanthum, Rhizorhabdus sp., and Sphingopyxis sp. (Sphingomonodaceae) were tested for pathogenicity on lettuce (Lactuca sativa) cultivars Salinas and Green Lakes, susceptible and resistant, respectively, or their resistant descendent breeding line (B.L.) 440-8, to R. suberifaciens type strain CA1T. Rhizorhabdus sp. CA15 and NL2, R. suberifaciens CA3, and Sphingopyxis CA32 were equally virulent to Green Lakes or B.L. 440-8 and Salinas. Over 40 accessions from four Lactuca species were tested for resistance to R. suberifaciens CA1T/CA3 or Rhizorhabdus sp. CA15/NL2. All lettuce accessions with resistance to CA1T were susceptible to isolates CA15, NL2 and/or CA3. None of the Lactuca lines were highly resistant to all four isolates. There was a significant differential interaction between eight Lactuca lines and ten isolates of Rhizorhapis and related genera with respect to corky root severity. Three strains of isolates were distinguished: (i) isolates with a similar virulence pattern as R. suberifaciens CA1T, (ii) isolates with a virulence pattern similar to that of R. suberifaciens CA3 and Sphingopyxis sp. CA32, and (iii) isolates of Rhizorhabdus being moderately aggressive to all Lactuca lines. Thus, strains belonging to several genera can cause similar symptoms (a rare phenomenon) but have different virulence patterns on Lactuca species and cultivars.

Original languageEnglish (US)
Pages (from-to)1053-1061
Number of pages9
JournalPlant Pathology
Volume63
Issue number5
DOIs
StatePublished - 2014

Keywords

  • Corky root resistance
  • Lettuce
  • Rhizomonas suberifaciens
  • Rhizorhabdus argenteus
  • Rhizorhapis suberifaciens
  • Sphingomonas suberifaciens

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science
  • Horticulture
  • Genetics

Fingerprint Dive into the research topics of 'Differential interactions between strains of rhizorhapis, sphingobium, sphingopyxis or rhizorhabdus and accessions of Lactuca spp. with respect to severity of corky root disease'. Together they form a unique fingerprint.

  • Cite this