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ARS Home » Pacific West Area » Salinas, California » Crop Improvement and Protection Research » Research » Research Project #433652

Research Project: Enumeration of Fusarium oxysporum f sp. Fragariae in Soil

Location: Crop Improvement and Protection Research

Project Number: 2038-22000-016-19-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Sep 1, 2017
End Date: Aug 31, 2020

The objective is to validate molecular quantification assays of soil by comparison with soil plating assays to determine the relationship between colony counts and results from real time polymerase chain reaction (PCR) assays. When appropriate genomic sequencing of important isolates will be conducted to confirm results and support diagnostic assay validation.

Field soils will be plated on selective medium by our cooperator to determine population densities of the soilborne strawberry pathogen Fusarium oxysporum f. sp. fragariae. The USDA, Agricultural Research Service (ARS) lab will do DNA extractions from the same soils and use the TaqMan real time PCR assay that is specific for the pathogen to evaluate the amount of DNA that is present. Regression analysis will be used to look at the correlation between the two. Important isolates will be cultured and DNA extracted for sending to a genomic sequencing facility for Illumina sequencing.