HopH1 is an effector protein of Pseudomonas syringae pv. tomato DC3000 and P. syringae pv. syringae B728a and is a homolog of the putative Zn-dependent protease effector Rip36 of Ralstonia solanacearum, which induces hypersensitive response (HR) cell death in a nonhost plant, Solanum torvum Sw. cv. Torubamubiga. Although P. syringae pv. phaseolicola (Pph) 1448A neither produces HopH1 nor induces HR cell death, hopH1-introduced Pph 1448A acquired the ability to induce HR. These results indicate that the putative Zn-protease HopH1 effector induces HR cell death in nonhost S. torvum.
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We are grateful to Dr. A. Collmer (Cornell University) for providing P. syringae pvs. tomato DC3000, syringae B728a, and phaseolicola 1448A. This work was supported in part by Grants-in-Aid for Scientific Research (Nos. 24658042 and 19H02956) from the Ministry of Education, Culture, Sports, Science and Technology of Japan and Joint Research Project by Okayama Prefecture.
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Nahar, K., Mukaihara, T., Taguchi, F. et al. HopH1 effectors of Pseudomonas syringae pv. tomato DC3000 and pv. syringae B728a induce HR cell death in nonhost eggplant Solanum torvum. J Gen Plant Pathol 87, 24–29 (2021). https://doi.org/10.1007/s10327-020-00961-z