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International Journal of Medicinal Mushrooms
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ISSN Imprimir: 1521-9437
ISSN En Línea: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.v18.i4.90
pages 355-363

In Vitro Studies of Secondary Metabolite−Related Responses in Some Species of Genus Grifola (Agaricomycetes) from Argentina

Pablo Daniel Postemsky
Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS), Universidad Nacional del Sur – CONICET. Laboratorio de Biotecnologia de Hongos Comestibles y Medicinales. Camino La Carrindanga Km. 7, Bahia Blanca (8000), Buenos Aires, Argentina
Nestor Raul Curvetto
Laboratory of Biotechnology of Edible and Medicinal Mushrooms, CERZOS (CONICET-UNS), Bahia Blanca, Buenos Aires, Argentina

SINOPSIS

Grifola gargal Singer and Grifola sordulenta (Mont.) Singer mushrooms are related to Grifola frondosa (Dicks.) Gray, which is well known for its medicinal properties. In vitro studies were performed to find a useful guide for optimizing the environmental parameters through biotransformation of lignocellulosic materials and basidiome development, also considering secondary metabolism−related responses (SMRRs) associated with these processes and the variability among species and strains; this optimization is necessary to make the mushroom's industrial cultivation profitable. Morphological features of mycelial cultures revealed that intraspecific variability was of taxonomic relevance. A low ligninolytic capacity in studied Grifola species was observed when compared with 2 control species: G. frondosa and Ganoderma lucidum. Experiments with nutrient media containing different carbohydrate sources indicated that G. gargal mycelia grew better in xylulose and G. sordulenta, in xylulose or cellulose; in addition, the latter species presented cellobiose dehydrogenase activity. An additional study of SMRRs under different light conditions (aroma, pigmentation, and morphogenic manifestations) showed that white light was better than blue, green, or red-filtered light at inducing advanced SMRRs. The results of SMRR stimulation are proposed as useful guidance for optimizing the environmental parameters for bioprocesses aimed at metabolite production.


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