Novel Multiplex and Loop-Mediated Isothermal Amplification (LAMP) Assays for Rapid Species and Mating-Type Identification of Oculimacula acuformis and O. yallundae (Causal Agents of Cereal Eyespot), and Application for Detection of Ascospore Dispersal and in planta Use

A - Papers appearing in refereed journals

King, K. M., Eyres, G. J., West, J. S., Siraf, C., Matusinsky, P., Palicova, J., Canning, G., Bateman, G. L., Fraaije, B. A. and Dyer, P. S. 2020. Novel Multiplex and Loop-Mediated Isothermal Amplification (LAMP) Assays for Rapid Species and Mating-Type Identification of Oculimacula acuformis and O. yallundae (Causal Agents of Cereal Eyespot), and Application for Detection of Ascospore Dispersal and in planta Use. Phytopathology. https://doi.org/10.1094/PHYTO-04-20-0116-R

AuthorsKing, K. M., Eyres, G. J., West, J. S., Siraf, C., Matusinsky, P., Palicova, J., Canning, G., Bateman, G. L., Fraaije, B. A. and Dyer, P. S.
Abstract

Eyespot, caused by the related fungal pathogens Oculimacula acuformis (OA) and O. yallundae (OY), is an important cereal stem-base disease in temperate parts of the world. Both species are dispersed mainly by splash-dispersed conidia but are also known to undergo sexual reproduction yielding apothecia containing ascospores. Field diagnosis of eyespot can be challenging with other pathogens causing similar symptoms, which complicates eyespot management strategies. Differences between OA and OY (e.g. host pathogenicity and fungicide sensitivity) require that both be targeted for effective disease management. Here, we develop and apply two molecular methods for species-specific and mating-type (MAT1-1 or MAT1-2) discrimination of OA and OY isolates. First, a multiplex PCR-based diagnostic assay targeting the MAT idiomorph region was developed allowing simultaneous determination of both species and mating type. This multiplex-PCR assay was successfully applied to type a global collection of isolates. Second, the development of loop-mediated isothermal amplification (LAMP) assays targeting beta-tubulin sequences is described, which allow fast (<9 min) species-specific discrimination of global OA and OY isolates. The LAMP assay can detect very small amounts of target DNA (1 pg) and was successfully applied in planta. In addition, mating-type specific LAMP assays were also developed for rapid (<12 min) genotyping of OA and OY isolates. Finally, the multiplex PCR-based diagnostic was applied, in conjunction with spore trapping in field experiments, to provide evidence of the wind dispersal of ascospores from a diseased crop. The results indicate an important role of the sexual cycle in the dispersal of eyespot

Year of Publication2020
JournalPhytopathology
Digital Object Identifier (DOI)https://doi.org/10.1094/PHYTO-04-20-0116-R
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Agriculture and Horticulture Development Board
Funder project or codeBBSRC Strategic Programme in Smart Crop Protection
Accepted author manuscript
Output statusPublished
Publication dates
Online04 Aug 2020
PublisherAmerican Phytopathological Society (APS)
ISSN0031-949X

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