Antarctic-derived yeasts: taxonomic identification and resistance to adverse conditions

Autor(es)

GABRIELE S. FARIAS ^[1] ; JULIANA A. SANTOS ^[2] ; PATRICIA GIOVANELLA ; LARA D. SETTE

Afiliação do(s) autor(es)

^[1] Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP). Instituto de Biociências - Brasil

^[2] Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP). Instituto de Biociências - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 94, 2022-03-25.

Resumo

Abstract Antarctic harsh conditions favor the development of microbial adaptations. In this study, a molecular approach was applied to identify/refine the taxonomy of five yeasts isolated from different Antarctic samples, which were tested against ranges of temperature, UV radiations, salinity, and pH. Based on sequencing and phylogenetic analysis, strain CRM 1839 was confirmed as Naganishia sp., and strains CRM 1874, CRM 1565, CRM 2571, and CRM 2576 were identified as Goffeauzyma gilvescens, Goffeauzyma gastrica, Candida atlantica, and Camptobasidium sp., respectively, being this last one possibly a new species. Growth at different temperatures indicates that these yeasts are psychrotolerant, with the exception of Camptobasidium sp., which presents psychrophilic characteristics. G. gastrica recovered from marine sediment showed the best results of resistance to UV radiation, being able to grow even after the exposure to UVB dose of 9144 J/m² and UVC dose of 6102 J/m². C. atlantica isolated from glacier soil showed high cellular growth from 3 to 10% NaCl. The majority of the strains produced higher biomass at pH 7; nevertheless, G. gilvescens showed higher biomass production at pH 9. The studied Antarctic-derived yeasts have adaptations to extreme conditions, which makes them useful for biotechnological applications and studies of extremophiles. (AU)

• Processo FAPESP: 17/14216-6 - Diversidade e resistência radiação UV de leveduras de solo de recuo de geleira da Antártica
• Beneficiário: Gabriele Santana de Farias
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/25170-1 - Fungos de solos da geleira Collins (Antártica): avaliação da diversidade e resistência à radiação UV
• Beneficiário: Juliana Aparecida dos Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado