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Type Three Secretion System in Pseudomonas savastanoi Pathovars: Does Timing Matter?

Stefania Tegli1, Andrea Gori2, Matteo Cerboneschi2

  • 1Laboratorio di Patologia Vegetale Molecolare, Dipartimento di Biotecnologie Agrarie, Universitá degli Studi di Firenze, Via della Lastruccia 10, 50019 Sesto Fiorentino, Firenze, Italy. stefania.tegli@unifi.it.

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This study investigates the Type Three Secretion System (TTSS) in Pseudomonas savastanoi pathovars. Different TTSS gene expression patterns were observed, potentially explaining varied virulence in olive knot disease and other hosts.

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Area of Science:

  • Bacteriology
  • Plant Pathology
  • Molecular Biology

Background:

  • Pseudomonas savastanoi pv. savastanoi causes Olive knot disease using the Type Three Secretion System (TTSS).
  • Limited information exists on the TTSS organization and function in other pathovars like pv. nerii and pv. fraxini, which infect different hosts.

Purpose of the Study:

  • To analyze the TTSS cluster organization across P. savastanoi pathovars.
  • To investigate the evolutionary relationships of TTSS operons within the P. syringae complex.
  • To compare the in vitro expression of key TTSS genes among the pathovars.

Main Methods:

  • Comparative analysis of TTSS gene cluster organization.
  • Phylogenetic analysis of TTSS operons (hrpC, hrpJ, hrpRS, hrpU, hrpZ).
  • Real-Time PCR to quantify in vitro gene expression.

Main Results:

  • The complete TTSS cluster organization was determined for P. savastanoi pv. savastanoi, pv. nerii, and pv. fraxini.
  • Phylogenetic analysis revealed evolutionary insights into TTSS operon diversification within the P. syringae complex.
  • Distinct in vitro expression patterns of four major TTSS genes were identified among the three pathovars.

Conclusions:

  • The study elucidates the structural organization and evolutionary history of the TTSS in different P. savastanoi pathovars.
  • Differential gene expression of TTSS components likely contributes to the distinct host specificities and virulence exhibited by these pathovars.