Citología comparativa del proceso de infección de los conidios falcatos y ovalados de Colletotrichum sublineola en cultivares de sorgo susceptibles y resistentes

Autores/as

DOI:

https://doi.org/10.33448/rsd-v9i11.10211

Palabras clave:

Conidios ovalados; Conidios falcados; Dimorfismo conidial; Sorghum bicolor; Interacción patógeno-hospedero.

Resumen

El modo principal de infección de Colletotrichum sublineola, el agente causal de la antracnosis en el sorgo, ocurre a través de conidios falcados producidos terminalmente en conidióforos en los acérvulos. Este patógeno también produce un tipo secundario de conidio, el conidio ovalado, de menor tamaño y ontogenia distinta de los falcados. El objetivo de este estudio fue comparar, mediante microscopía óptica, el proceso de infección entre estos dos tipos de conidios, los óvalos y falcados de C. sublineola, en cultivares de sorgo resistente y susceptible. Se inocularon hojas desprendidas de 25 días de edad del cultivar BR009 (susceptible) y SC283 (resistente) con ambos conidios del aislado patogénico 204.01 y el proceso de infección se acompañó por microscopía óptica de 2 a 168 h después de la inoculación (DI). Ambos tipos de conidios germinaron 2 h DI y, independientemente del cultivar, después de 4 h DI se formaron apresorios redondeados con superficie lisa directamente de los conidios falcados, mientras que se formaron apresorios levemente irregulares en la punta de los tubos tubos germinativos emitidos por los conidios ovalados. En el cultivar susceptible, los apresorios fueron formados con mayor frecuencia por los conidios falcados, mientras que en el cultivar resistente estas estructuras fueron formadas con mayor frecuencia por los conidios ovalados. Se visualizaron los poros de penetración y las hifas de infección en todos los materiales inoculados con ambos tipos de conidios. Los primeros síntomas de la enfermedad se observaron en el material inoculado con conidios falcados y fueron superiores en el cultivar susceptible. En todos los tratamientos se observaron lesiones con acérvulos que contenían conidios falcados, cerrando así el ciclo de infección.

Citas

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Publicado

03/12/2020

Cómo citar

SOUZA-PACCOLA, E. A. de; SPERANDIO, I. F.; MEIRELLES, W. F.; LINDE, G. A. .; COLAUTO, N. B. .; PACCOLA-MEIRELLES, L. D. Citología comparativa del proceso de infección de los conidios falcatos y ovalados de Colletotrichum sublineola en cultivares de sorgo susceptibles y resistentes. Research, Society and Development, [S. l.], v. 9, n. 11, p. e78491110211, 2020. DOI: 10.33448/rsd-v9i11.10211. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/10211. Acesso em: 2 jul. 2024.

Número

Sección

Ciencias Agrarias y Biológicas