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A Global Marker Database for Phytophthora infestans.

Gregory A Forbes1, Stephen B Goodwin2, André Drenth3

  • 1International Potato Center (CIP).

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|March 13, 2019
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Summary
This summary is machine-generated.

A global database of Phytophthora infestans isolates was created, detailing genetic markers and fungicide resistance. This resource aids researchers in tracking the potato and tomato late blight pathogen worldwide.

Keywords:
DNA fingerprintsRG57population genetics

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Area of Science:

  • * Agricultural Science
  • * Plant Pathology
  • * Molecular Biology

Background:

  • * Phytophthora infestans is the pathogen responsible for late blight in potatoes and tomatoes.
  • * Understanding the genetic diversity and geographic distribution of P. infestans is crucial for disease management.
  • * Previous studies have identified distinct genetic groups, termed 'old' and 'new' genotypes.

Purpose of the Study:

  • * To compile a comprehensive database of Phytophthora infestans isolates.
  • * To establish a standardized nomenclature for multilocus genotypes.
  • * To analyze the genetic diversity and population structure of P. infestans globally.

Main Methods:

  • * Compilation of isolate data from 41 locations across 31 countries and 10 regions in Mexico.
  • * Characterization of isolates using restriction fragment length polymorphism (RFLP) fingerprinting, mating type, dilocus allozyme genotype, mitochondrial DNA haplotype, metalaxyl sensitivity, and virulence.
  • * Development of a nomenclature system for multilocus genotypes using ISO country codes and unique numbers.
  • * Cluster analysis of genotypes to assess population structure and relationships.

Main Results:

  • * A database containing information on 1,776 P. infestans isolates was created.
  • * 305 unique RFLP fingerprints and 258 unique multilocus genotypes were identified.
  • * Seven new multilocus genotypes were discovered and named.
  • * Cluster analysis confirmed the classification of 'old' and 'new' genotypes and revealed geographic clustering.
  • * A2 genotypes from Argentina showed distinct characteristics.

Conclusions:

  • * The compiled database provides a valuable resource for Phytophthora research globally.
  • * The standardized nomenclature facilitates consistent reporting of P. infestans genotypes.
  • * Genetic diversity and geographic distribution patterns of P. infestans are complex, with evidence of both clonal spread and recombination.
  • * The database and analysis contribute to a better understanding of P. infestans evolution and epidemiology.