Characterization of Lignocellulolytic Activities from a Moderate Halophile Strain of Aspergillus caesiellus Isolated from a Sugarcane Bagasse Fermentation: e105893

A moderate halophile and thermotolerant fungal strain was isolated from a sugarcane bagasse fermentation in the presence of 2 M NaCl that was set in the laboratory. This strain was identified by polyphasic criteria as Aspergillus caesiellus. The fungus showed an optimal growth rate in media containi...

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Bibliographic Details
Published in:PloS one 2014-08, Vol.9 (8)
Main Authors: Batista-Garcia, Ramon Alberto, Balcazar-Lopez, Edgar, Miranda-Miranda, Estefan, Sanchez-Reyes, Ayixon, Cuervo-Soto, Laura, Aceves-Zamudio, Denise, Atriztan-Hernandez, Karina, Morales-Herrera, Catalina, Rodriguez-Hernandez, Rocio, Folch-Mallol, Jorge
Format: Article
Language:English
Subjects:
Agave
Aspergillus
Triticum aestivum
Zea mays
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Summary:A moderate halophile and thermotolerant fungal strain was isolated from a sugarcane bagasse fermentation in the presence of 2 M NaCl that was set in the laboratory. This strain was identified by polyphasic criteria as Aspergillus caesiellus. The fungus showed an optimal growth rate in media containing 1 M NaCl at 28 degree C and could grow in media added with up to 2 M NaCl. This strain was able to grow at 37 and 42 degree C, with or without NaCl. A. caesiellus H1 produced cellulases, xylanases, manganese peroxidase (MnP) and esterases. No laccase activity was detected in the conditions we tested. The cellulase activity was thermostable, halostable, and no differential expression of cellulases was observed in media with different salt concentrations. However, differential band patterns for cellulase and xylanase activities were detected in zymograms when the fungus was grown in different lignocellulosic substrates such as wheat straw, maize stover, agave fibres, sugarcane bagasse and sawdust. Optimal temperature and pH were similar to other cellulases previously described. These results support the potential of this fungus to degrade lignocellulosic materials and its possible use in biotechnological applications.
ISSN:1932-6203
DOI:10.1371/journal.pone.0105893