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Detection of Phytophthora capsici in Irrigation Water using Loop-Mediated Isothermal Amplification
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Phytophthora beyond agriculture.

Everett M Hansen1, Paul W Reeser, Wendy Sutton

  • 1Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331, USA. hansene@science.oregonstate.edu

Annual Review of Phytopathology
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Summary
This summary is machine-generated.

Indigenous Phytophthora species are increasingly discovered in diverse forest habitats, revealing a complex community structure. Research highlights new species and ecological roles, emphasizing their importance in forest ecosystems.

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Area of Science:

  • Ecology
  • Mycology
  • Forest Pathology

Background:

  • Indigenous Phytophthora species in natural ecosystems are poorly understood.
  • Evidence suggests a diverse and trophically complex Phytophthora community is vital in forest ecosystems.
  • The number of described Phytophthora species has significantly increased, particularly since 2000, due to new discoveries and taxonomic revisions.

Purpose of the Study:

  • To explore Phytophthora diversity in various forest habitats, including soil, streams, and tree canopies.
  • To understand the ecological amplitude and roles of Phytophthora species in forest ecosystems.
  • To hypothesize ecological assemblages of forest Phytophthora species.

Main Methods:

  • Exploration of forest soil, streams, and upper tree canopies for Phytophthora diversity.
  • Identification of species, including those in internal transcribed spacer (ITS) Clade 6.
  • Analysis of ecological roles and potential pathogen assemblages.

Main Results:

  • Temperate forest surveys regularly identify 10–20 Phytophthora species, with over half described since 2000.
  • Taxa in ITS Clade 6 are abundant in forest streams, potentially acting as saprophytes.
  • Three ecological assemblages are hypothesized: aquatic opportunists, foliar pathogens, and soilborne root/canker pathogens.

Conclusions:

  • A growing appreciation for the ecological breadth of Phytophthora is emerging.
  • Indigenous Phytophthora communities are diverse and ecologically significant in forests.
  • Aggressive invasive Phytophthora species are associated with all hypothesized ecological groups.