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Development of high-throughput methods to screen disease caused by Rhizoctonia solani AG 2-1 in oilseed rape

Drizou, Fryni; Graham, Neil S.; Bruce, Toby J. A.; Ray, Rumiana V.

Authors

Fryni Drizou

Neil S. Graham

Toby J. A. Bruce

Rumiana V. Ray



Abstract

Background: Rhizoctonia solani (Kühn) is a soil-borne, necrotrophic fungus causing damping off, root rot and stem canker in many cultivated plants worldwide. Oilseed rape (OSR, Brassica napus) is the primary host for anastomosis group (AG) 2-1 of R. solani causing pre- and post-emergence damping-off resulting in death of seedlings and impaired crop establishment. Presently, there are no known resistant OSR genotypes and the main methods for disease control are fungicide seed treatments and cultural practices. The identification of sources of resistance for crop breeding is essential for sustainable management of the disease. However, a high-throughput, reliable screening method for resistance traits is required. The aim of this work was to develop a low cost, rapid screening method for disease phenotyping and identification of resistance traits.
Results: Four growth systems were developed and tested: (1) nutrient media plates, (2) compost trays, (3) light expanded clay aggregate (LECA) trays, and (4) a hydroponic pouch and wick system. Seedlings were inoculated with virulent AG 2-1 to cause damping-off disease and grown for a period of 4–10 days. Visual disease assessments were carried out or disease was estimated through image analysis using ImageJ.
Conclusion: Inoculation of LECA was the most suitable method for phenotyping disease caused by R. solani AG 2-1 as it enabled the detection of differences in disease severity among OSR genotypes within a short time period whilst allowing measurements to be conducted on whole plants. This system is expected to facilitate identification of resistant germplasm.

Journal Article Type Article
Publication Date May 30, 2017
Journal Plant Methods
Electronic ISSN 1746-4811
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 13
Issue 1
APA6 Citation Drizou, F., Graham, N. S., Bruce, T. J. A., & Ray, R. V. (2017). Development of high-throughput methods to screen disease caused by Rhizoctonia solani AG 2-1 in oilseed rape. Plant Methods, 13(1), https://doi.org/10.1186/s13007-017-0195-1
DOI https://doi.org/10.1186/s13007-017-0195-1
Keywords Rhizoctonia solani ; Oilseed rape ; High-throughput phenotyping ; Disease ; Plant characteristics
Publisher URL https://plantmethods.biomedcentral.com/articles/10.1186/s13007-017-0195-1
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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