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Characterization of Antibacterial Strains against Kiwifruit Bacterial Canker Pathogen
Plant Pathol. J. 2019;35:473-485
Published online October 1, 2019
© 2019 The Korean Society of Plant Pathology.

Min-Jung Kim1†¶, Dae-Han Chae2†, Gyeongjun Cho2, Da-Ran Kim1, and Youn-Sig Kwak1,2*

1Department of Plant Medicine and Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea
2Division of Applied Life Science, Gyeongsang National University, Jinju 58282, Korea
Current address: Research Institute of BIO Technology, CJ, Suwon 16495, Korea
Correspondence to: Phone) +82-55-772-1922, FAX) +82-55-772-1929
E-mail) kwak@gnu.ac.kr
Youn-Sig Kwak
https://orcid.org/0000-0003-2139-1808
These authors contributed equally to this work

Handling Editor : Seo, Young-Su
Received May 29, 2019; Revised July 9, 2019; Accepted July 22, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Kiwifruit (Actinidia spp.) is an economically important crop and a bacterial canker disease, caused by Pseudomonas syringae pv. actinidiae (Psa), is the most destructive disease in kiwifruit production. Therefore, prevent and control of the disease is a critical issue in kiwifruit industry worldwide. Unfortunately, there is no reliable control methods have been developed. Recently, interest in disease control using microbial agents is growing. However, kiwifruit microbiota and their roles in the disease control is mainly remaining unknown. In this study, we secured bacterial libraries from kiwifruit ecospheres (rhizosphere, endospere, and phyllosphere) and screened reliable biocontrol strains against Psa. As the results, Streptomyces racemochromogenes W1SF4, Streptomyces sp. W3SF9 and S. parvulus KPB2 were selected as anti-Psa agents from the libraries. The strains showed forcible antibacterial activity as well as exceptional colonization ability on rhizosphere or phyllosphere of kiwifruit. Genome analyses of the strains suggested that the strains may produce several anti-Psa secondary metabolites. Our results will contribute to develop biocontrol strains against the kiwifruit canker pathogen and the disease management strategies.
Keywords : bacterial canker, biological control, kiwifruit, Streptomyces


October 2019, 35 (5)
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