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Plant Microbiology

Role of Bacterial Communities in the Natural Suppression of Rhizoctonia solani Bare Patch Disease of Wheat (Triticum aestivum L.)

Chuntao Yin, Scot H. Hulbert, Kurtis L. Schroeder, Olga Mavrodi, Dmitri Mavrodi, Amit Dhingra, William F. Schillinger, Timothy C. Paulitz
Chuntao Yin
aDepartment of Plant Pathology, Washington State University, Pullman, Washington, USA
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Scot H. Hulbert
aDepartment of Plant Pathology, Washington State University, Pullman, Washington, USA
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Kurtis L. Schroeder
aDepartment of Plant Pathology, Washington State University, Pullman, Washington, USA
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Olga Mavrodi
aDepartment of Plant Pathology, Washington State University, Pullman, Washington, USA
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Dmitri Mavrodi
aDepartment of Plant Pathology, Washington State University, Pullman, Washington, USA
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Amit Dhingra
bDepartment of Horticulture and Landscape Architecture, Washington State University, Pullman, Washington, USA
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William F. Schillinger
cDepartment of Crop and Soil Sciences, Washington State University, Pullman, Washington, USA
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Timothy C. Paulitz
dUSDA Agricultural Research Service, Root Disease and Biological Control Research Unit, Pullman, Washington, USA
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DOI: 10.1128/AEM.01610-13
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ABSTRACT

Rhizoctonia bare patch and root rot disease of wheat, caused by Rhizoctonia solani AG-8, develops as distinct patches of stunted plants and limits the yield of direct-seeded (no-till) wheat in the Pacific Northwest of the United States. At the site of a long-term cropping systems study near Ritzville, WA, a decline in Rhizoctonia patch disease was observed over an 11-year period. Bacterial communities from bulk and rhizosphere soil of plants from inside the patches, outside the patches, and recovered patches were analyzed by using pyrosequencing with primers designed for 16S rRNA. Taxa in the class Acidobacteria and the genus Gemmatimonas were found at higher frequencies in the rhizosphere of healthy plants outside the patches than in that of diseased plants from inside the patches. Dyella and Acidobacteria subgroup Gp7 were found at higher frequencies in recovered patches. Chitinophaga, Pedobacter, Oxalobacteriaceae (Duganella and Massilia), and Chyseobacterium were found at higher frequencies in the rhizosphere of diseased plants from inside the patches. For selected taxa, trends were validated by quantitative PCR (qPCR), and observed shifts of frequencies in the rhizosphere over time were duplicated in cycling experiments in the greenhouse that involved successive plantings of wheat in Rhizoctonia-inoculated soil. Chryseobacterium soldanellicola was isolated from the rhizosphere inside the patches and exhibited significant antagonism against R. solani AG-8 in vitro and in greenhouse tests. In conclusion, we identified novel bacterial taxa that respond to conditions affecting bare patch disease symptoms and that may be involved in suppression of Rhizoctonia root rot and bare batch disease.

FOOTNOTES

    • Received 24 May 2013.
    • Accepted 17 September 2013.
    • Accepted manuscript posted online 20 September 2013.
  • Supplemental material for this article may be found at http://dx.doi.org/10.1128/AEM.01610-13.

  • Copyright © 2013, American Society for Microbiology. All Rights Reserved.
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Role of Bacterial Communities in the Natural Suppression of Rhizoctonia solani Bare Patch Disease of Wheat (Triticum aestivum L.)
Chuntao Yin, Scot H. Hulbert, Kurtis L. Schroeder, Olga Mavrodi, Dmitri Mavrodi, Amit Dhingra, William F. Schillinger, Timothy C. Paulitz
Applied and Environmental Microbiology Nov 2013, 79 (23) 7428-7438; DOI: 10.1128/AEM.01610-13

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Role of Bacterial Communities in the Natural Suppression of Rhizoctonia solani Bare Patch Disease of Wheat (Triticum aestivum L.)
Chuntao Yin, Scot H. Hulbert, Kurtis L. Schroeder, Olga Mavrodi, Dmitri Mavrodi, Amit Dhingra, William F. Schillinger, Timothy C. Paulitz
Applied and Environmental Microbiology Nov 2013, 79 (23) 7428-7438; DOI: 10.1128/AEM.01610-13
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