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<p>One of the genomic islands in <i>Pseudomonas syringae</i> pv. <i>tabaci</i> 6605 (GI-1<sub><i>Pta</i>6605</sub>) has been identified as a pathogenicity island required for virulence because the deletion almost completely eliminated disease symptoms in inoculation tests at 4 × 10<sup>5</sup>&#xa0;CFU/ml. GI-1<sub><i>Pta</i>6605</sub> contains four cargo regions (CRs) named CR-1 to CR-4. The ∆CR-4 mutant did not produce tabtoxin like ∆GI-1 and disease symptoms did not develop in tobacco. However, it grew, although to a lesser extent than the wild-type strain. These results indicate that the tabtoxin biosynthetic gene cluster in GI-1 is required for virulence but not for establishment of compatibility.</p>

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Tabtoxin biosynthetic gene cluster in Pseudomonas syringae pv. tabaci 6605 genomic island 1 (GI-1Pta6605) is required for severe disease symptoms

  • 期刊论文

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  • 发表日期：

    2026年2月19日

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  • Kotomi Kunishi,
  • Norika Fujisawa,
  • Hidenori Matsui,
  • Nanami Sakata,
  • Yoshiteru Noutoshi,
  • Kazuhiro Toyoda,
  • Yuki Ichinose

摘要

One of the genomic islands in Pseudomonas syringae pv. tabaci 6605 (GI-1Pta6605) has been identified as a pathogenicity island required for virulence because the deletion almost completely eliminated disease symptoms in inoculation tests at 4 × 105 CFU/ml. GI-1Pta6605 contains four cargo regions (CRs) named CR-1 to CR-4. The ∆CR-4 mutant did not produce tabtoxin like ∆GI-1 and disease symptoms did not develop in tobacco. However, it grew, although to a lesser extent than the wild-type strain. These results indicate that the tabtoxin biosynthetic gene cluster in GI-1 is required for virulence but not for establishment of compatibility.