Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence
Ralstonia solanacearum OE1-1 (OE1-1) is pathogenic to tobacco. The type III-secreted effector protein popA of OE1-1 showed 97.6% identity to popA of R. solanacearum GMI1000, which is not pathogenic to tobacco. Reverse transcription-polymerase chain reaction analysis showed that popA in OE1-1 was exp...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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The American Phytopathological Society
2003-05-01
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| Series: | Molecular Plant-Microbe Interactions |
| Subjects: | |
| Online Access: | https://apsjournals.apsnet.org/doi/10.1094/MPMI.2003.16.5.447 |
| _version_ | 1811275720443297792 |
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| author | Ayami Kanda Masahiko Yasukohchi Kouhei Ohnishi Akinori Kiba Tetsuro Okuno Yasufumi Hikichi |
| author_facet | Ayami Kanda Masahiko Yasukohchi Kouhei Ohnishi Akinori Kiba Tetsuro Okuno Yasufumi Hikichi |
| author_sort | Ayami Kanda |
| collection | DOAJ |
| description | Ralstonia solanacearum OE1-1 (OE1-1) is pathogenic to tobacco. The type III-secreted effector protein popA of OE1-1 showed 97.6% identity to popA of R. solanacearum GMI1000, which is not pathogenic to tobacco. Reverse transcription-polymerase chain reaction analysis showed that popA in OE1-1 was expressed at 3 h after inoculation (HAI), but not before, in infiltrated-tobacco leaves. Pathogenicity analysis using a popABC operon-deleted mutant of OE1-1 (ΔABC) showed that popABC is not directly involved in the pathogenicity of OE1-1. When Papa, which constitutively expresses popA, was infiltrated into tobacco leaves, popA was expressed by 0.5 HAI. Papa could no longer multiply or spread in tobacco leaves and was no longer virulent. Moreover, the hypersensitive response (HR) and expression of HR-related genes were not induced in Papa-infiltrated leaves. Papa was also avirulent in a tobacco root-dipping inoculation assay. These results suggest that the expression of popA in Papa immediately after invasion triggers the suppression of bacterial proliferation and movement, resulting in loss of virulence. However, Papa retained its virulence when directly inoculated into xylem vessels. This result suggests that tobacco plants can recognize PopA when it is expressed early in disease development, and respond with an effective defense in the intercellular spaces. |
| first_indexed | 2024-04-12T23:42:49Z |
| format | Article |
| id | doaj.art-a0c62d2e2926459e8c5ccf28df6ac7a8 |
| institution | Directory Open Access Journal |
| issn | 0894-0282 1943-7706 |
| language | English |
| last_indexed | 2024-04-12T23:42:49Z |
| publishDate | 2003-05-01 |
| publisher | The American Phytopathological Society |
| record_format | Article |
| series | Molecular Plant-Microbe Interactions |
| spelling | doaj.art-a0c62d2e2926459e8c5ccf28df6ac7a82022-12-22T03:11:56ZengThe American Phytopathological SocietyMolecular Plant-Microbe Interactions0894-02821943-77062003-05-0116544745510.1094/MPMI.2003.16.5.447Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of VirulenceAyami KandaMasahiko YasukohchiKouhei OhnishiAkinori KibaTetsuro OkunoYasufumi HikichiRalstonia solanacearum OE1-1 (OE1-1) is pathogenic to tobacco. The type III-secreted effector protein popA of OE1-1 showed 97.6% identity to popA of R. solanacearum GMI1000, which is not pathogenic to tobacco. Reverse transcription-polymerase chain reaction analysis showed that popA in OE1-1 was expressed at 3 h after inoculation (HAI), but not before, in infiltrated-tobacco leaves. Pathogenicity analysis using a popABC operon-deleted mutant of OE1-1 (ΔABC) showed that popABC is not directly involved in the pathogenicity of OE1-1. When Papa, which constitutively expresses popA, was infiltrated into tobacco leaves, popA was expressed by 0.5 HAI. Papa could no longer multiply or spread in tobacco leaves and was no longer virulent. Moreover, the hypersensitive response (HR) and expression of HR-related genes were not induced in Papa-infiltrated leaves. Papa was also avirulent in a tobacco root-dipping inoculation assay. These results suggest that the expression of popA in Papa immediately after invasion triggers the suppression of bacterial proliferation and movement, resulting in loss of virulence. However, Papa retained its virulence when directly inoculated into xylem vessels. This result suggests that tobacco plants can recognize PopA when it is expressed early in disease development, and respond with an effective defense in the intercellular spaces.https://apsjournals.apsnet.org/doi/10.1094/MPMI.2003.16.5.447bacterial wilt |
| spellingShingle | Ayami Kanda Masahiko Yasukohchi Kouhei Ohnishi Akinori Kiba Tetsuro Okuno Yasufumi Hikichi Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence Molecular Plant-Microbe Interactions bacterial wilt |
| title | Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence |
| title_full | Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence |
| title_fullStr | Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence |
| title_full_unstemmed | Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence |
| title_short | Ectopic Expression of Ralstonia solanacearum Effector Protein PopA Early in Invasion Results in Loss of Virulence |
| title_sort | ectopic expression of ralstonia solanacearum effector protein popa early in invasion results in loss of virulence |
| topic | bacterial wilt |
| url | https://apsjournals.apsnet.org/doi/10.1094/MPMI.2003.16.5.447 |
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