Efecto de la Radiación Ultravioleta-C sobre la Morfología de la Cianobacteria Nostoc sp. LBALBR-2 Aislado del Embalse de Abastecimiento (Belém, Pará, Brasil)

Autores/as

DOI:

https://doi.org/10.33448/rsd-v11i12.34391

Palabras clave:

Cianobacterias; Floración; Microcosmo.

Resumen

Las cianobacterias son organismos procarióticos fotosintéticos que en el medio acuático pueden componer fitoplancton y fitobentos, presentando importancia en la producción primaria de estos ecosistemas. El objetivo de este trabajo fue identificar las principales variaciones morfológicas de células, filamentos y talos de la cianobacteria Nostoc sp. LBALBR-2 sometido a radiación ultravioleta (UV-C) en sistemas de microcosmos. La cianobacteria Nostoc sp. se sometió a cuatro tratamientos: 1- tratamiento testigo en medio nutritivo; 2- tratamiento en medio nutritivo con exposición a radiación UV-C; 3- tratamiento control en medio sin nutrientes y 4- tratamiento en medio sin nutrientes con exposición a radiación UV-C. Se realizaron análisis de densidad óptica y clorofila-a para determinar el crecimiento de las poblaciones de Nostoc y análisis microscópicos para caracterizar el desarrollo morfológico de la especie. La falta de nutrientes generó tricomas cortos con heterocitos terminales, acinetas solitarias dispersas y aparición de hormonas. En medio nutritivo, los tricomas de Nostoc presentaron predominantemente la forma seriada vegetativa. Los cultivos expuestos a UV-C produjeron células anómalas, mucílago espeso, tricomas fragmentados y hormonas. Se concluye que Nostoc sp. LBALBR-2 se desarrolló bien en condiciones de eutrofización y, a pesar de mostrar deformaciones celulares, fue resistente a la radiación UV-C.

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Publicado

20/09/2022

Cómo citar

SOUSA, E. B. de .; GOMES , A. L. .; CUNHA, C. J. da S. .; PIRES, P. V. B. .; AHNDREW, L. M. S. .; COSTA-TAVARES, V. B. da . Efecto de la Radiación Ultravioleta-C sobre la Morfología de la Cianobacteria Nostoc sp. LBALBR-2 Aislado del Embalse de Abastecimiento (Belém, Pará, Brasil). Research, Society and Development, [S. l.], v. 11, n. 12, p. e447111234391, 2022. DOI: 10.33448/rsd-v11i12.34391. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/34391. Acesso em: 17 jul. 2024.

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Ciencias Agrarias y Biológicas