Analysis of microsatellites from the transcriptome of downy mildew pathogens and their application for characterization of Pseudoperonospora populations
Downy mildew pathogens affect several economically important crops worldwide but, due to their obligate nature, few genetic resources are available for genomic and population analyses. Draft genomes for emergent downy mildew pathogens such as the oomycete , causal agent of cucurbit downy mildew, hav...
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Published in | PeerJ (San Francisco, CA) Vol. 5; p. e3266 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
PeerJ. Ltd
02.05.2017
PeerJ, Inc PeerJ Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Downy mildew pathogens affect several economically important crops worldwide but, due to their obligate nature, few genetic resources are available for genomic and population analyses. Draft genomes for emergent downy mildew pathogens such as the oomycete
, causal agent of cucurbit downy mildew, have been published and can be used to perform comparative genomic analysis and develop tools such as microsatellites to characterize pathogen population structure. We used bioinformatics to identify 2,738 microsatellites in the
predicted transcriptome and evaluate them for transferability to the hop downy mildew pathogen,
, since no draft genome is available for this species. We also compared the microsatellite repertoire of
to that of the model organism
, which causes downy mildew in Arabidopsis. Although trends in frequency of motif-type were similar, the percentage of SSRs identified from
transcripts differed significantly from
. The majority of a subset of microsatellites selected for laboratory validation (92%) produced a product in
isolates, and 83 microsatellites demonstrated transferability to
. Eleven microsatellites were found to be polymorphic and consistently amplified in
isolates. Analysis of
isolates from diverse hosts and locations revealed higher diversity in
compared to
isolates. These microsatellites will be useful in efforts to better understand relationships within
species and
on a population level. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2167-8359 2167-8359 |
DOI: | 10.7717/peerj.3266 |