| Autor: |
Muñoz-Zavala C; Departamento de Parasitología Agrícola, Universidad Autónoma Chapingo, Texcoco 56230, Estado de México, Mexico.; International Maize and Wheat Improvement Center (CIMMYT), Texcoco 56237, Estado de México, Mexico., Loladze A; International Maize and Wheat Improvement Center (CIMMYT), Texcoco 56237, Estado de México, Mexico., Vargas-Hernández M; Departamento de Suelos, Universidad Autónoma Chapingo, Texcoco 56230, Estado de México, Mexico., García-León E; Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias, Campo Experimental Valle del Fuerte, Guasave 81110, Sinaloa, Mexico., Alakonya AE; International Maize and Wheat Improvement Center (CIMMYT), Texcoco 56237, Estado de México, Mexico., Tovar-Pedraza JM; Laboratorio de Fitopatología, Coordinación Regional Culiacán, Centro de Investigación en Alimentación y Desarrollo, Culiacán 80110, Sinaloa, Mexico., Goodwin PH; School of Environmental Sciences, University of Guelph, Guelph N1G 2W1, Ontario, Canada., Leyva-Mir SG; Departamento de Parasitología Agrícola, Universidad Autónoma Chapingo, Texcoco 56230, Estado de México, Mexico. |
| Jazyk: |
angličtina |
| Zdroj: |
Plant disease [Plant Dis] 2023 Apr; Vol. 107 (4), pp. 1054-1059. Date of Electronic Publication: 2023 Apr 20. |
| DOI: |
10.1094/PDIS-03-22-0626-RE |
| Abstrakt: |
Turcicum leaf blight (TLB) is a common foliar disease of maize in Mexico that is caused by the fungal pathogen Exserohilum turcicum . The most effective management strategy against TLB is monogenic race-specific resistance. Among the 140 E. turcicum isolates from symptomatic leaves collected from maize fields in Mexico, 100 were obtained from tropical (Veracruz) and temperate areas (Estado de México) between 2010 and 2019, and 40 isolates were obtained from tropical (Sinaloa, Tamaulipas, Veracruz, and Chiapas), subtropical (Nayarit, Jalisco, and Guanajuato), and temperate areas (Estado de Mexico, Hidalgo, and Puebla) collected in 2019. All the isolates caused TLB symptoms on the positive control ( ht4 ), showing that they were all pathogenic. Six physiological races of E. turcicum (2, 3, 23, 3N, 23N, and 123N) were identified based on resistant or susceptible responses displayed by five maize differential genotypes (A619 Ht1 , A619 Ht2 , A619 Ht3 , B68 HtN , and A619 ht4 ). The most common was race 23, accounting for 68% of the isolates, followed by races 23N, 123N, 3, 2, and 3N at 15, 8, 6, 2, and 1%, respectively. Race 123N was able to infect the greatest number of maize differential genotypes used in the study. Race 123N was detected in Sinaloa and Estado de México. Race 3 was detected in Nayarit and Jalisco. Race 2 was detected in Jalisco, Estado de México, and Veracruz, and race 3N was detected in Tamaulipas. Race 23 was equally dominant in the tropical, subtropical, and temperate regions, while race 123N was more common in the tropical environment, and race 23N was more common in the tropical and temperate environments. There was no evidence for shifts in the races between 2010 and 2019. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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