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Helvécio D Coletta-Filho1, Leonora S Bittleston, Rodrigo P P Almeida

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The plant pathogen Xylella fastidiosa shows high genetic diversity in Napa Valley, California. Despite its spread via vectors, genetic analysis reveals a largely panmictic population structure, suggesting effective dispersal.

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Area of Science:

  • Plant Pathology
  • Microbial Genetics
  • Ecology

Background:

  • Vector-borne pathogens like Xylella fastidiosa are crucial in agriculture, but their population genetics and spatial structure remain poorly understood.
  • Xylella fastidiosa causes Pierce's disease in grapevines, impacting viticulture, and is transmitted by insect vectors from reservoir plants.

Purpose of the Study:

  • To investigate the genetic structure and diversity of Xylella fastidiosa populations in Napa Valley, California.
  • To determine the extent of genetic differentiation among X. fastidiosa populations in different vineyard and riparian habitats.

Main Methods:

  • Utilized 20 simple sequence repeat (SSR) loci to analyze 93 X. fastidiosa isolates.
  • Calculated genetic diversity indices (Simpson's D, Nei's H) and population genetic statistics (FST).
  • Employed Bayesian clustering (STRUCTURE, BAPS) and Mantel tests to infer population structure and gene flow.

Main Results:

  • Observed high genotypic diversity with 83 distinct multilocus microsatellite genotypes among 93 isolates.
  • Found moderate Nei's gene diversity (average H = 0.41) and a low index of clonal fraction.
  • Detected weak or absent genetic structure among populations (low FST values) and no significant isolation by distance, indicating a panmictic population.

Conclusions:

  • Riparian vegetation supports a genetically diverse X. fastidiosa population that serves as a source for vineyard infections.
  • Effective dispersal mechanisms, likely mediated by vectors, prevent significant genetic isolation among populations.
  • Understanding the population genetics of X. fastidiosa is critical for managing Pierce's disease in grapevines.