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Extracellular Polymeric Substances of Pseudomonas chlororaphis O6 Induce Systemic Drought Tolerance in Plants
Res. Plant Dis. 2018;24:242-247
Published online September 30, 2018
© 2018 The Korean Society of Plant Pathology.

Song Mi Cho1, Anne J. Anderson2, and Young Cheol Kim3*

1Department of Floriculture, Chunnam Techno University, Jeonnam 57500, Korea
2Department of Biological Engineering, Utah State University, Logan, UT 84322-5305, USA
3Institute of Environmentally-Friendly Agriculture, Department of Plant Biotechnology, Chonnam National University, Gwangju 61186, Korea
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Received August 13, 2018; Revised August 20, 2018; Accepted August 20, 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.
Pseudomonas chlororaphis O6 induces systemic tolerance in plants against drought stress. A volatile, 2R, 3R-butanediol, produced by the bacterium causes partial stomatal closure, thus, limiting water loss from the plant. In this study, we report that applications of extracellular polymeric substances (EPS) from P. chlororaphis O6 to epidermal peels of leaves of Arabidopsis thaliana also reduce the size of stomatal openings. Growth of A. thaliana seedlings with applications of the EPS from P. chlororaphis O6 reduced the extent of wilting when water was withheld from the plants. Fluorescence measurements showed photosystem II was protected in the A. thaliana leaves in the water stressed EPS-exposed plants. These findings indicate that P. chlororaphis O6 has redundancy in traits associated with induction of mechanisms to limit water stress in plants.
Keywords : Abiotic stress, Biological control, Priming, Stomatal closure

September 2018, 24 (3)