Emergencia y crecimiento inicial de festuca alta libre e infectada con endófitos silvestres o seguros

Autores

  • L.R. Petigrosso
  • G. Spagnuolo
  • O.R. Vignolio
  • M.G. Monterubbianesi
  • S.G. Assuero

DOI:

https://doi.org/10.24215/16699513e065

Palavras-chave:

Festuca arundinacea, Epichloë coenophiala, porcentaje de emergencia, acumulación de materia seca, infección endofítica

Resumo

El objetivo de este trabajo fue evaluar, durante la etapa temprana de implantación de festuca alta, el porcentaje y la velocidad de emergencia, la producción de biomasa y la proporción de raíz en plantas provenientes de una población naturalizada del sudeste de la Provincia de Buenos Aires (S) y del cv. Taita (T), libres (S- y T-, respectivamente) e infectadas con el endófito silvestre Epichloë coenophiala (S+) y con el endófito seguro AR584 (T+) respectivamente. Se sembraron ocho bandejas plantineras de 50 celdas para cada tratamiento (i.e. S-, S+, T- y T+) y se ubicaron de forma tal que la superficie superior de la misma quedara al ras del suelo en una parcela preparada para la siembra de una pastura. El número de plántulas emergidas en cada bandeja se registró diariamente hasta los 28 días desde la siembra y se determinó el porcentaje y la velocidad de emergencia. A los 47 días desde la siembra se determinó la materia seca de la parte aérea y radical de las plantas emergidas. A los 28 días desde la siembra, no se registraron diferencias significativas en el número de plantúlas emergidas dentro de las festucas infectadas (p=0,9965) ni entre las libres (p=0,7525). No se encontraron diferencias significativas (p=0,4738) entre las festucas en la velocidad de emergencia. Las festucas infectadas presentaron una biomasa total por planta superior a la de las libres debido a una mayor biomasa de raíces, aunque las diferencias para ambas variables sólo fueron significativas (p<0,001) en el caso del cv. Taita. En nuestras condiciones la presencia del endófito aumentó el porcentaje de plántulas emergidas tanto en la población naturalizada como en Taita, y promovió el desarrollo radical en este último.

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Publicado

2021-06-20

Como Citar

Petigrosso, L. ., Spagnuolo, G., Vignolio, O., Monterubbianesi, M., & Assuero, S. (2021). Emergencia y crecimiento inicial de festuca alta libre e infectada con endófitos silvestres o seguros. Revista Da Faculdade De Agronomia, 120(1), 065. https://doi.org/10.24215/16699513e065

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Trabajos Científicos