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Identificación de razas de roya de la hoja del trigo presentes en Uruguay durante 2011-2012 Translated title: Identification of Wheat Leaf Rust Races Present in Uruguay during 2011-2012

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      Abstract

      Resumen: La roya de la hoja de trigo (RH), causada por Puccinia triticina Ericks, es una de las enfermedades del cultivo más prevalentes en Uruguay y otros países del Cono Sur. En epidemias severas se han estimado pérdidas de rendimiento de más de 50 % y pueden ser necesarias dos o más aplicaciones de fungicidas para controlar la enfermedad en cultivares susceptibles. Los estudios de la variabilidad del patógeno son importantes para determinar su rango de virulencia, para inferir el mecanismo de su variación, determinar el origen y dispersión de los patotipos y confirmar la presencia de nuevas razas inferidas por el cambio de comportamiento del hospedero. El objetivo de esta investigación fue estudiar la diversidad en la población de P. triticina en Uruguay durante 2011 y 2012. Se estudiaron un total de 363 muestras de RH recolectadas en diferentes momentos de distintos cultivares y localidades de la región del cultivo. La prevalencia de las 22 razas identificadas (de mayor a menor frecuencia MFP; TDT-10,20; MDP; MDT-10,20; TFT-10,20; MFP-20; MFP-10,20; MDP-20; DBB-10,20; MKD-10; TPR-20,39; MFT-10,20; MDP-10,20; MDR-10,20; MFT; MDT; MFP-10; MHJ-10; MJD-10; TMD-10,20; MCP; MFR-10,20), se relacionó a su virulencia sobre los cultivares utilizados por los agricultores. La presencia o frecuencia de las razas varió entre años, zonas y momento de recolección. Se reportan por primera vez las razas DBB-10,20, MHJ-10, MJD-10, MKD-10, TMD-10,20 y TPR-20,30, no previamente detectadas en Uruguay. Este estudio permitió confirmar que la población del patógeno presente en Uruguay es diversa y continúa evolucionando.

      Translated abstract

      Summary: Leaf rust (LR), caused by Puccinia triticina Ericks, is one of the most prevalent wheat diseases in Uruguay and other countries of the Southern Cone. The economic importance of the disease is clear considering that, in severe epidemics, grain yield losses of more than 50 % have been determined and that two or more fungicide applications are necessary to control the disease in susceptible cultivars. Studies on the pathogen variability are important to determine its range of virulence, infer the mechanism of its variation, determine the origin and spread of pathotypes, complement the knowledge of the resistance of commercial cultivars, confirm the presence of new races inferred by change of the host reaction, and identify races important for breeding and specific studies. The objective of this research was to study the diversity in the P. triticina population in Uruguay during 2011 and 2012.Atotal of 363 LR samples collected at different times from different cultivars and locations of the crop area were studied. The prevalence of 22 identified races (higher to lower frequency: MFP; TDT-10,20; MDP; MDT-10,20; TFT-10,20; MFP-20; MFP-10,20; MDP-20; DBB-10,20; MKD-10; TPR-20,39; MFT-10,20; MDP-10,20; MDR-10,20; MFT; MDT; MFP-10; MHJ-10; MJD-10; TMD-10,20; MCP; MFR-10,20), was related to the virulence on cultivars used by farmers. The presence or frequency of the races varied among years, zones and time of collection. Two races not previously reported were detected. This study confirmed that the pathogen population present in Uruguay is diverse and continues to evolve.

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      Most cited references 12

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      Global status of wheat leaf rust caused by Puccinia triticina

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        INHERITANCE OF VIRULENCE IN WHEAT LEAF RUST ON THE STANDARD DIFFERENTIAL WHEAT VARIETIES

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          The situation of common wheat rusts in the Southern Cone of America and perspectives for control

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            Author and article information

            Affiliations
            orgnameInstituto Paraguayo de Tecnología Agraria Paraguay
            orgnameInstituto Nacional de Investigación Agropecuaria Uruguay sgerman@ 123456inia.org.uy
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            agro
            Agrociencia Uruguay
            Agrociencia Uruguay
            Facultad de Agronomía - Instituto Nacional de Investigación Agropecuaria (Montevideo, , Uruguay )
            1510-0839
            2301-1548
            June 2019
            : 23
            : 1
            : 28-36
            S2301-15482019000100028 10.31285/agro.23.1.10

            This work is licensed under a Creative Commons Attribution 4.0 International License.

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            Figures: 0, Tables: 0, Equations: 0, References: 23, Pages: 9
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            Product Information: SciELO Uruguay
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