Algas y Cyanobacteria presentes en la rizosfera de plantas acumuladoras de plomo

Autores

  • Alejandra G. Becerra Laboratorio de Micología, Instituto Multidisciplinario de Biología Vegetal (IMBIV) - CONICET- Universidad Nacional de Córdoba (UNC)
  • Claudia Daga Departamento de Diversidad Biológica y Ecología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Argentina
  • Raquel Murialdo Departamento de Hidráulica, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Argentina
  • Valeria Faggioli Instituto Nacional de Tecnología Agropecuaria, EEAMarcos Juárez, Ruta 12 km 36, 2580 Marcos Juárez, Argentina.
  • Eugenia Menoyo Grupo de Estudios Ambientales (GEA), Instituto de Matemática Aplicada San Luis (IMASL)–CONICET, Universidad Nacional de San Luis, Ejército de los Andes 950, 5700 San Luis, Argentina
  • M. Julieta Salazar Instituto Multidisciplinario de Biología Vegetal (IMBIV)-CONICET, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sársfield, 1611. Córdoba, Argentina

DOI:

https://doi.org/10.31055/1851.2372.v56.n1.29317

Palavras-chave:

Cianobacterias, Metales pesados, Planta, Plomo, Rizósfera, Trebouxia, Vaucheria

Resumo

Introducción y objetivos: Las especies de algas y Cyanobacteria que crecen en sitios contaminados pueden acumular altas concentraciones de metales pesados. En este trabajo se propuso a) caracterizar la comunidad de algas y Cyanobacteria y b) evaluar el efecto del plomo (Pb) sobre la composición de algas presentes en la rizosfera de plantas capaces de acumular Pb en la provincia de Córdoba. 

M&M: Se tomaron muestras de suelo de la rizosfera de Sorghum halepense, Bidens pilosa y Tagetes minuta en sitios con diferentes niveles de Pb. En el laboratorio, el suelo se sembró en cápsulas con medio de Watanabe esterilizado. Los cultivos crecieron 9 semanas. Se identificó en el tiempo y analizó la frecuencia relativa final de las algas y Cyanobacteria.

Resultados: En suelos contaminados se identificaron 24 especies de Cyanobacteria, Chloroplastida y Xanthophyceae. Las Cyanobacteria con heterocitos Cylindrospermum muscicola, Nostoc commune y Calothrix clavata registraron una frecuencia media relativa (entre 21 y 60%). Trebouxia parmeliae (Chloroplastida) y Vaucheria sp. (Xanthophyceae) estuvieron presentes en los suelos con mayor nivel de Pb. La mayor parte de las especies se concentraron en los niveles más bajos de Pb.

Conclusiones: Se observó un efecto negativo del Pb sobre la riqueza de especies de algas y Cyanobacteria en la rizosfera de las plantas evaluadas. En base a la composición de la comunidad de algas y Cyanobacteria del suelo se determinan dos grandes grupos que podrían ser considerados como comunidades tolerantes y no tolerantes a la contaminación de Pb.

Biografia do Autor

  • Alejandra G. Becerra, Laboratorio de Micología, Instituto Multidisciplinario de Biología Vegetal (IMBIV) - CONICET- Universidad Nacional de Córdoba (UNC)

    Laboratorio de Micología, Departamento de Diversidad Biológica y Ecología Prof. Asociada de la Cátedra de Diversidad Biológica I, Investigadora Independiente del Conicet, Insituto Multidisciplinario de Biología Vegetal.

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Publicado

2021-02-18

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Ficología

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“Algas Y Cyanobacteria Presentes En La Rizosfera De Plantas Acumuladoras De Plomo”. 2021. Boletín De La Sociedad Argentina De Botánica 56 (1). https://doi.org/10.31055/1851.2372.v56.n1.29317.

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