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A new quantitative real-time PCR assay for Rhizoctonia solani AG3-PT and the detection of AGs of Rhizoctonia solani associated with potato in soil and tuber samples in Great Britain

Lookup NU author(s): Professor Neil Boonham

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Abstract

Rhizoctonia solani is an important pathogen of potatoes causing stem canker and black scurf. The fungus is a species complex comprised of 13 known anastomosis groups (AGs). AG3-PT is the anastomosis group frequently associated with disease in potatoes. A real-time PCR assay was designed to the rDNA ITS region of AG3-PT isolates to enable the pathogen to be detected directly in tuber and soil samples. The resulting assay was highly specific for AG3-PT, and did not amplify DNA from isolates from other AGs or subgroups of AG3. Using a bulk DNA extraction method capable of extracting from up to 250 g of soil, the assay could detect one individual sclerotium of AG3-PT (weighing 200 μg) in 250 g of soil. The AG3-PT assay was used, with assays for AG2-1, AG5 and AG8 to determine the prevalence of those AGs in UK potato soils and tubers. AG2-1 and AG3-PT were the predominant groups in tubers and soils, although AG3-PT was more frequently isolated from tubers, highlighting its importance as a potato pathogen. AG3-PT was also detected in more than half of the tuber samples tested suggesting the importance of seed borne inoculum. © 2013 UK Crown Copyright.


Publication metadata

Author(s): Woodhall JW, Adams IP, Peters JC, Harper G, Boonham N

Publication type: Article

Publication status: Published

Journal: European Journal of Plant Pathology

Year: 2013

Volume: 136

Issue: 2

Pages: 273-280

Print publication date: 01/06/2013

Online publication date: 07/01/2013

ISSN (print): 0929-1873

ISSN (electronic): 1573-8469

Publisher: Springer

URL: https://doi.org/10.1007/s10658-012-0161-8

DOI: 10.1007/s10658-012-0161-8


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