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Development of Polymorphic Microsatellite Loci for Potato Wart from Next-Generation Sequence Data
Marie-Claude Gagnon1, Theo A J van der Lee1, Peter J M Bonants1
1First and seventh authors: Canadian Food Inspection Agency, 3851 Fallowfield Road, Ottawa, ON K2H 8P9, Canada; second and third authors: Wageningen University and Research Center, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands; fourth and fifth authors: Canadian Food Inspection Agency, 93 Mount Edward Road, Charlottetown, PEI C1A 5T1, Canada; and sixth author: Agriculture and Agri-Food Canada, 960 Carling Ave, Ottawa, ON K1A 0C6, Canada.
New microsatellite markers were developed to study genetic diversity in Synchytrium endobioticum, the fungus causing potato wart disease. These markers help track pathogen spread and improve disease management strategies globally.
Area of Science:
- Plant Pathology
- Mycology
- Genetics
Background:
- Synchytrium endobioticum causes potato wart disease, a significant agricultural threat.
- Global quarantine measures are in place due to the pathogen's severity and persistence.
- Existing molecular markers are for species detection, not for studying intraspecific genetic diversity.
Purpose of the Study:
- To develop and characterize microsatellite markers for assessing genetic diversity within Synchytrium endobioticum.
- To investigate the genetic structure and population dynamics of S. endobioticum isolates from different geographic regions.
Main Methods:
- Whole-genome sequencing of an S. endobioticum isolate (MB42) to identify microsatellite motifs.
- Amplification and polymorphism analysis of 21 selected microsatellite markers in 22 S. endobioticum isolates.
- Multilocus genotype analysis to assess genetic diversity and population structure.
Main Results:
- Nineteen distinct multilocus genotypes were identified among the 22 isolates.
- Isolates from Canada showed genetic clustering, while European isolates did not cluster by geographic origin.
- No correlation was found between specific genotypes and pathotypes, indicating high genetic variability within pathotypes.
Conclusions:
- Developed microsatellite markers are effective for assessing intraspecific genetic diversity of S. endobioticum.
- These markers facilitate tracking and tracing of pathogen genotypes, aiding in understanding migration and spread.
- The findings support improved management strategies for potato wart disease by providing tools for genetic analysis.
