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Enhanced resistance to fungal and bacterial diseases in tomato and Arabidopsis expressing BSR2 from rice

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The overexpression of rice BSR2 would offer a simple and effective strategy to protect plants from multiple devastating diseases in tomato and Arabidopsis.

Abstract

Many devastating plant diseases are caused by pathogens possessing a wide host range. Fungal Botrytis cinerea and Rhizoctonia solani, as well as bacterial Pseudomonas syringae and Ralstonia pseudosolanacearum are four such pathogens that infect hundreds of plant species, including agronomically important crops, and cause serious diseases, leading to severe economic losses. However, reports of genes that can confer resistance to broad host-range pathogens via traditional breeding methods are currently limited. We previously reported that Arabidopsis plants overexpressing rice BROAD-SPECTRUM RESISTANCE2 (BSR2/CYP78A15) showed tolerance not only to bacterial P. syringae pv. tomato DC3000 but also to fungal Colletotrichum higginsianum and R. solani. Rice plants overexpressing BSR2 displayed tolerance to two R. solani anastomosis groups. In the present study, first, BSR2-overexpressing (OX) Arabidopsis plants were shown to be additionally tolerant to B. cinerea, R. solani, and R. pseudosolanacearum. Next, tomato ‘Micro-Tom’ was used as a model to determine whether such tolerance by BSR2 can be introduced into dicot crops to prevent infection from pathogens possessing wide host range. BSR2-OX tomato displayed broad-spectrum disease tolerance to fungal B. cinerea and R. solani, as well as to bacterial P. syringae and R. pseudosolanacearum. Additionally, undesirable traits such as morphological changes were not detected. Thus, BSR2 overexpression can offer a simple and effective strategy to protect crops from multiple destructive diseases.

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Acknowledgements

This work was supported by the Special Coordination Fund for Promoting Science and Technology (Japan Science and Technology Agency), by grants for the Research Program on Development of Innovative Technology (NARO Bio-oriented Technology Research Advancement Institution (Grant no. 29004A)), and by the JSPS KAKENHI Grant (no. JP20H02953). We especially thank Dr. Shigemi Seo (NIAS, Japan) for helping with infection by R. pseudosolanacearum. We thank Dr. Brian J. Staskawicz (UC Berkeley, USA) for providing Pst DC3000, Dr. Toyozo Sato (NIAS, Japan) for helping with B. cinerea culture, and Dr. Aya Akagi (NIAS, Japan) for helping with infection by B. cinerea. Thanks go to Dr. Takahito Nomura (Utsunomiya Univ., Japan) and Dr. Yoshiki Habu (NIAS, Japan) for helpful discussions. We also thank Lois Ishizaki, Tomiko Senba, Chiyoko Umeda, and Yuka Yamazaki (NIAS, Japan) for their support with overall technical assistance. We would like to thank Editage (www.editage.com) for English language editing.

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SM carried out the experimental work and contributed to the manuscript composition. NY and KO contributed to the generation of transgenic tomato. MM directed the research and contributed to the manuscript composition.

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Correspondence to Masaki Mori.

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The authors declare no conflict of interest.

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Communicated by Neal Stewart.

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Maeda, S., Yokotani, N., Oda, K. et al. Enhanced resistance to fungal and bacterial diseases in tomato and Arabidopsis expressing BSR2 from rice. Plant Cell Rep 39, 1493–1503 (2020). https://doi.org/10.1007/s00299-020-02578-0

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  • DOI: https://doi.org/10.1007/s00299-020-02578-0

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