Development of Molecular Methods to Detect Macrophomina phaseolina from Strawberry Plants and Soil

Author:

Burkhardt Alyssa1ORCID,Ramon Marina L.1,Smith Brett1,Koike Steven T.1,Martin Frank1

Affiliation:

1. First, second, third, and fifth authors: Crop Improvement and Protection Research Unit, United States Department of Agriculture–Agricultural Research Service, Salinas, CA; and fourth author: TriCal Diagnostics, Hollister, CA.

Abstract

Macrophomina phaseolina is a broad-host-range fungus that shows some degree of host preference on strawberry, and causes symptoms that include crown rot and root rot. Recently, this pathogen has affected strawberry production as fumigation practices have changed, leaving many growers in California and around the world in need of accurate, rapid diagnostic tools for M. phaseolina in soil and infected plants. This study uses next-generation sequencing and comparative genomics to identify a locus that is unique to isolates within a main genotype shared by a majority of isolates that infect strawberry. This locus was used to develop a quantitative single-tube nested TaqMan polymerase chain reaction assay which is able to quantify as little as 2 to 3 microsclerotia/g of soil with 100% genotype specificity. An isothermal assay using recombinase polymerase amplification was developed from the same locus and has been validated on over 200 infected strawberry plants with a diagnostic sensitivity of 93% and a diagnostic specificity of 99%. Together, this work demonstrates the value of using new approaches to identify loci for detection and provides valuable diagnostic tools that can be used to monitor soil and strawberry plant samples for M. phaseolina.

Publisher

Scientific Societies

Subject

Plant Science,Agronomy and Crop Science

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