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Pathogenic diversity of Phytophthora sojae in the southeast of the Province of Buenos Aires

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Abstract

Phytophthora sojae causes root and stem rot of soybeans. In Argentina, this pathogen has shown dramatic shifts in pathotype variability since its first discovery during the 1970s. The aim of this study was to report the presence and distribution of different pathotypes of P. sojae isolates from 2013 to 2015 in the southeast of Buenos Aires Province in Argentina. Isolates were obtained from diseased soybean plants and soil in contact with the infected root. The pathotype evaluation of P. sojae was determined with a set of eight differential soybean lines. One hundred and twenty-four P. sojae isolates were obtained and forty pathotypes were determined, which is a considerable variability for a relatively new and recently infested soybean area.

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Acknowledgements

Many thanks to Austin McCoy (PhD student at Michigan State University) for his assistance with the R environment for “hagis” program. This research was financially supported by UBACyT project N° 20020170200391BA and UNMDP project N° AGR517/16.

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Authors and Affiliations

  1. Facultad de Agronomía, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina

    Pablo E. Grijalba

  2. Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, Balcarce, Argentina

    Azucena del C. Ridao

  3. Agencia de Extensión Rural QUINES, Instituto Nacional de Tecnología Agropecuaria, Quines, San Luis, Argentina

    Eduardo Guillin

  4. Instituto Spegazzini, Universidad Nacional de La Plata , La Plata, Argentina

    Mónica Steciow

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  1. Pablo E. Grijalba
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  2. Azucena del C. Ridao
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  3. Eduardo Guillin
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  4. Mónica Steciow
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Correspondence to Pablo E. Grijalba.

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Grijalba, P.E., del C. Ridao, A., Guillin, E. et al. Pathogenic diversity of Phytophthora sojae in the southeast of the Province of Buenos Aires. Trop. plant pathol. 45, 397–401 (2020). https://doi.org/10.1007/s40858-020-00364-7

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  • DOI: https://doi.org/10.1007/s40858-020-00364-7

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