Gene expression in Brassica campestris showing a hypersensitive response to the incompatible pathogen Xanthomonas campestris pv. vitians

David B. Collinge*, Dawn E. Milligan, J. Maxwell Dow, Graham Scofield, Michael J. Daniels

*Corresponding author for this work
48 Citations (Scopus)

Abstract

Xanthomonas campestris pv. vitians, a pathogen of lettuce, elicits a hypersensitive response within 12 hours of inoculation into Brassica leaves, characterized by tissue collapse, loss of membrane integrity, vein blockage and melanin production. In contrast, the compatible pathogen, X. c. pv. campestris, has no visible effects on leaves for 48 hours, after which inoculated areas show chlorosis which eventually spreads, followed by rotting. mRNA was prepared from leaves inoculated with suspensions of both pathovars or with sterile medium up to 24 hours following inoculation. In vitro translation of total and poly A+ RNA in rabbit reticulocyte lysate in the presence of 35S methionine followed by separation of the polypeptide products by 2D-PAGE, allowed comparison of the effects of these treatments on plant gene expression. Major changes in gene expression were observed as a consequence of the inoculation technique. In addition, after inoculation with X. c. vitians, up to fifteen additional major polypeptides appeared or greatly increased by four hours. Some of these had disappeared by nine hours and several more had appeared. No major polypeptides disappeared or decreased greatly in intensity following inoculation with X. c. vitians.

Original languageEnglish
JournalPlant Molecular Biology
Volume8
Issue number5
Pages (from-to)405-414
Number of pages10
ISSN0167-4412
DOIs
Publication statusPublished - 1 Sept 1987
Externally publishedYes

Keywords

  • Brassica campestris
  • gene expression
  • hypersensitive response
  • mRNA induction
  • Xanthomonas campestris pv. vitians

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