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Enhancement of Tomato Tolerance to Biotic and Abiotic Stresses by Variovorax sp. PMC12
Res. Plant Dis. 2018;24:221-232
Published online September 30, 2018
© 2018 The Korean Society of Plant Pathology.

Hyeon Su Kim1, Shin Ae Lee1, Yiseul Kim1, Mee kyung Sang1, Jaekyeong Song1, Jong-Chan Chae2, and Hang-Yeon Weon1*

1Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
2Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 54596, Korea
Tel: +82-63-238-3042
Fax: +82-63-238-3834
Received August 10, 2018; Revised August 30, 2018; Accepted September 2, 2018.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Rhizobacteria play important roles in plant growth and health enhancement and render them resistant to not only biotic stresses but also abiotic stresses, such as low/high temperature, drought, and salinity. This study aimed to select plant growth promoting rhizobacteria (PGPR) with the capability to mitigate biotic and abiotic stress effects on tomato plants. We isolated a novel PGPR strain, Variovorax sp. PMC12 from tomato rhizosphere. An in vitro assay indicated that strain PMC12 produced ammonia, indole-3-acetic acid (IAA), siderophore, and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, which are well-known traits of PGPR. The aboveground fresh weight was significantly higher in tomato plants treated with strain PMC12 than in non-treated tomato plants under various abiotic stress conditions including salinity, low temperature, and drought. Furthermore, strain PMC12 also enhanced the resistance to bacterial wilt disease caused by Ralstonia solanacearum. Taken together, these results indicated that strain PMC12 is a promising biocontrol agent and a biostimulant to reduce the susceptibility of plants to both abiotic and biotic stresses.
Keywords : Abiotic stress, Biological control, Biotic stress, PGPR, Tomato

September 2018, 24 (3)