Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil
Northern corn leaf blight (NCLB) is one of the most important diseases in maize worldwide. It is caused by the fungus Exserohilum turcicum, which exhibits a high genetic variability for virulence, and hence physiological races have been reported. Disease control is based mainly on fungicide applicat...
| Autores principales: | , , , , |
|---|---|
| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2021
|
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/9049 https://link.springer.com/article/10.1007/s40858-020-00417-x https://doi.org/10.1007/s40858-020-00417-x |
| _version_ | 1855036143610888192 |
|---|---|
| author | Navarro, Barbara Ludwig Ramos Romero, Lucía Kistner, María Belén Iglesias, Juliana Von Tiedemann, Andreas |
| author_browse | Iglesias, Juliana Kistner, María Belén Navarro, Barbara Ludwig Ramos Romero, Lucía Von Tiedemann, Andreas |
| author_facet | Navarro, Barbara Ludwig Ramos Romero, Lucía Kistner, María Belén Iglesias, Juliana Von Tiedemann, Andreas |
| author_sort | Navarro, Barbara Ludwig |
| collection | INTA Digital |
| description | Northern corn leaf blight (NCLB) is one of the most important diseases in maize worldwide. It is caused by the fungus Exserohilum turcicum, which exhibits a high genetic variability for virulence, and hence physiological races have been reported. Disease control is based mainly on fungicide application and host resistance. Qualitative resistance has been widely used to control NCLB through the deployment of Ht genes. Known pathogen races are designated according to their virulence to the corresponding Ht gene. Knowledge about of E. turcicum race distribution in maize-producing areas is essential to develop and exploit resistant genotypes. Maize leaves showing distinct elliptical grey-green lesions were collected from maize-producing areas of Argentina and Brazil, and 184 monosporic E. turcicum isolates were obtained. A total of 66 isolates were collected from Argentina during 2015, 2018 and 2019, while 118 isolates from Brazil were collected during 2017, 2018 and 2019. All isolates were screened on maize differential lines containing Ht1, Ht2, Ht3 and Htn1 resistance genes. In greenhouse experiments, inoculated maize plants were evaluated at 14 days after inoculation. Resistance reaction was characterized by chlorosis, and susceptibility was defined by necrosis in the absence of chlorosis. The most frequent race was 0 in both Argentina (83%) and Brazil (65%). Frequencies of race 1 (6% and 24%) and race 23N (5% and 10%) were very low in Argentina and Brazil, respectively. The high frequency of race 0 isolates provides evidence that qualitative resistance based on the tested Ht genes is not being used extensively in Argentina and Brazil to control NCLB. This information may be relevant for growers and breeding programs as the incidence of NCLB is increasing in both countries. |
| format | info:ar-repo/semantics/artículo |
| id | INTA9049 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | INTA90492021-04-08T16:02:14Z Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil Navarro, Barbara Ludwig Ramos Romero, Lucía Kistner, María Belén Iglesias, Juliana Von Tiedemann, Andreas Maíz Control de Enfermedades de Plantas Exserohilum Fungicidas Argentina Brasil Tizón Resistencia a la Enfermedad Genes Maize Plant Disease Control Fungicides Brazil Blight Disease Resistance Población Patógena Northern corn leaf blight (NCLB) is one of the most important diseases in maize worldwide. It is caused by the fungus Exserohilum turcicum, which exhibits a high genetic variability for virulence, and hence physiological races have been reported. Disease control is based mainly on fungicide application and host resistance. Qualitative resistance has been widely used to control NCLB through the deployment of Ht genes. Known pathogen races are designated according to their virulence to the corresponding Ht gene. Knowledge about of E. turcicum race distribution in maize-producing areas is essential to develop and exploit resistant genotypes. Maize leaves showing distinct elliptical grey-green lesions were collected from maize-producing areas of Argentina and Brazil, and 184 monosporic E. turcicum isolates were obtained. A total of 66 isolates were collected from Argentina during 2015, 2018 and 2019, while 118 isolates from Brazil were collected during 2017, 2018 and 2019. All isolates were screened on maize differential lines containing Ht1, Ht2, Ht3 and Htn1 resistance genes. In greenhouse experiments, inoculated maize plants were evaluated at 14 days after inoculation. Resistance reaction was characterized by chlorosis, and susceptibility was defined by necrosis in the absence of chlorosis. The most frequent race was 0 in both Argentina (83%) and Brazil (65%). Frequencies of race 1 (6% and 24%) and race 23N (5% and 10%) were very low in Argentina and Brazil, respectively. The high frequency of race 0 isolates provides evidence that qualitative resistance based on the tested Ht genes is not being used extensively in Argentina and Brazil to control NCLB. This information may be relevant for growers and breeding programs as the incidence of NCLB is increasing in both countries. EEA Pergamino Fil: Navarro, Barbara Ludwig. Georg-August-Universität Göttingen. Division of Plant Pathology and Crop Protection. Department of Crop Sciences; Alemania Fil: Ramos Romero, Lucía. Georg-August-Universität Göttingen. Division of Plant Pathology and Crop Protection. Department of Crop Sciences; Alemania Fil: Ramos Romero, Lucía. The New Zealand Institute for Plant and Food Research Limited; Nueva Zelanda Fil: Kistner, María Belén. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Maíz; Argentina Fil: Kistner, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Iglesias, Juliana. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Maíz; Argentina. Fil: Iglesias, Juliana. Universidad Nacional del Noroeste de la Provincia de Buenos Aires. Escuela de Agrarias, Naturales y Ambientales; Argentina Fil: Von Tiedemann, Andreas. Georg-August-Universität Göttingen. Division of Plant Pathology and Crop Protection. Department of Crop Sciences; Alemania 2021-04-08T15:48:09Z 2021-04-08T15:48:09Z 2021-02 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/9049 https://link.springer.com/article/10.1007/s40858-020-00417-x 1983-2052 (online) https://doi.org/10.1007/s40858-020-00417-x eng info:eu-repograntAgreement/INTA/2019-PD-E4-I090-001/2019-PD-E4-I090-001/AR./Análisis de patosistemas en cultivos agrícolas y especies forestales. Caracterización de sus componentes info:eu-repograntAgreement/INTA/2019-PE-E6-I128-001/2019-PE-E6-I128-001/AR./Mejoramiento genético de maíz y sorgo info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Springer Tropical Plant Pathology 46 : 1-10. (February 2021) |
| spellingShingle | Maíz Control de Enfermedades de Plantas Exserohilum Fungicidas Argentina Brasil Tizón Resistencia a la Enfermedad Genes Maize Plant Disease Control Fungicides Brazil Blight Disease Resistance Población Patógena Navarro, Barbara Ludwig Ramos Romero, Lucía Kistner, María Belén Iglesias, Juliana Von Tiedemann, Andreas Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil |
| title | Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil |
| title_full | Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil |
| title_fullStr | Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil |
| title_full_unstemmed | Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil |
| title_short | Assessment of physiological races of Exserohilum turcicum isolates from maize in Argentina and Brazil |
| title_sort | assessment of physiological races of exserohilum turcicum isolates from maize in argentina and brazil |
| topic | Maíz Control de Enfermedades de Plantas Exserohilum Fungicidas Argentina Brasil Tizón Resistencia a la Enfermedad Genes Maize Plant Disease Control Fungicides Brazil Blight Disease Resistance Población Patógena |
| url | http://hdl.handle.net/20.500.12123/9049 https://link.springer.com/article/10.1007/s40858-020-00417-x https://doi.org/10.1007/s40858-020-00417-x |
| work_keys_str_mv | AT navarrobarbaraludwig assessmentofphysiologicalracesofexserohilumturcicumisolatesfrommaizeinargentinaandbrazil AT ramosromerolucia assessmentofphysiologicalracesofexserohilumturcicumisolatesfrommaizeinargentinaandbrazil AT kistnermariabelen assessmentofphysiologicalracesofexserohilumturcicumisolatesfrommaizeinargentinaandbrazil AT iglesiasjuliana assessmentofphysiologicalracesofexserohilumturcicumisolatesfrommaizeinargentinaandbrazil AT vontiedemannandreas assessmentofphysiologicalracesofexserohilumturcicumisolatesfrommaizeinargentinaandbrazil |