Flagellin from Pseudomonas syringae pv. tabaci induced hrp-independent HR in tomato

Mizuri Marutani, Fumiko Taguchi, Rena Shimizu, Yoshishige Inagaki, Kazuhiro Toyoda, Tomonori Shiraishi, Yuki Ichinose

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We have previously shown that flagellin of Pseudomonas syringae pv. tabaci is an elicitor that induces a hypersensitive reaction (HR) in nonhost tomato cells. Flagellin is the major HR elicitor produced by this pathogen, as shown by the inability of a flagellin-defective mutant, ΔfliC, to induce HR. Also, a ΔfliD mutant that secretes large amounts of monomer flagellins induces a strong HR in tomato. In this study, the possible involvement of an Hrp type III secretion system (TTSS) in flagellin-induced HR was investigated using flagella-defective mutants or Hrp TTSS-defective mutants. The hrcC gene encodes HrcC protein, which is required for Hrp pilus formation in the outer membrane. An hrcC mutation, introduced into the wild-type, ΔfliC, and ΔfliD mutants of P. syringae pv. tabaci did not affect swimming motility or flagellin secretion, whereas all ΔhrcC, ΔfliC, and ΔfliD mutants lost the ability to cause disease on host tobacco leaves. However, the ΔhrcC mutant and the ΔfliD/ΔhrcC double mutant were still able to induce HR cell death, expression of one of the defense-related genes hsr203J, and the generation of hydrogen peroxide in nonhost tomato cells. Thus, flagellin is required for both pathogenicity in host tobacco and HR in nonhost tomato. On the other hand, hrp TTSS is necessary for pathogenicity on host tobacco but is not indispensable to induce HR in nonhost tomato. These results clearly show that flagellin-induced HR is hrp-independent in tomato.

Original languageEnglish
Pages (from-to)289-295
Number of pages7
JournalJournal of General Plant Pathology
Volume71
Issue number4
DOIs
Publication statusPublished - Aug 2005

Fingerprint

Pseudomonas syringae pv. tabaci
flagellin
hypersensitive response
tomatoes
mutants
tobacco
bacterial motility
pathogenicity
type III secretion system
fimbriae
flagellum
hydrogen peroxide
cell death
genes
secretion
cells

Keywords

  • Flagellin
  • hrcC
  • hrp
  • Hypersensitive reaction
  • Pseudomonas syringae

ASJC Scopus subject areas

  • Plant Science

Cite this

Flagellin from Pseudomonas syringae pv. tabaci induced hrp-independent HR in tomato. / Marutani, Mizuri; Taguchi, Fumiko; Shimizu, Rena; Inagaki, Yoshishige; Toyoda, Kazuhiro; Shiraishi, Tomonori; Ichinose, Yuki.

In: Journal of General Plant Pathology, Vol. 71, No. 4, 08.2005, p. 289-295.

Research output: Contribution to journalArticle

Marutani, Mizuri ; Taguchi, Fumiko ; Shimizu, Rena ; Inagaki, Yoshishige ; Toyoda, Kazuhiro ; Shiraishi, Tomonori ; Ichinose, Yuki. / Flagellin from Pseudomonas syringae pv. tabaci induced hrp-independent HR in tomato. In: Journal of General Plant Pathology. 2005 ; Vol. 71, No. 4. pp. 289-295.
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abstract = "We have previously shown that flagellin of Pseudomonas syringae pv. tabaci is an elicitor that induces a hypersensitive reaction (HR) in nonhost tomato cells. Flagellin is the major HR elicitor produced by this pathogen, as shown by the inability of a flagellin-defective mutant, ΔfliC, to induce HR. Also, a ΔfliD mutant that secretes large amounts of monomer flagellins induces a strong HR in tomato. In this study, the possible involvement of an Hrp type III secretion system (TTSS) in flagellin-induced HR was investigated using flagella-defective mutants or Hrp TTSS-defective mutants. The hrcC gene encodes HrcC protein, which is required for Hrp pilus formation in the outer membrane. An hrcC mutation, introduced into the wild-type, ΔfliC, and ΔfliD mutants of P. syringae pv. tabaci did not affect swimming motility or flagellin secretion, whereas all ΔhrcC, ΔfliC, and ΔfliD mutants lost the ability to cause disease on host tobacco leaves. However, the ΔhrcC mutant and the ΔfliD/ΔhrcC double mutant were still able to induce HR cell death, expression of one of the defense-related genes hsr203J, and the generation of hydrogen peroxide in nonhost tomato cells. Thus, flagellin is required for both pathogenicity in host tobacco and HR in nonhost tomato. On the other hand, hrp TTSS is necessary for pathogenicity on host tobacco but is not indispensable to induce HR in nonhost tomato. These results clearly show that flagellin-induced HR is hrp-independent in tomato.",
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