Antioxidant enzyme activity of filamentous fungi isolated from Livingston Island, Maritime Antarctica

Cold Stress in Antarctic Fungi Targets Enzymes of the Glycolytic Pathway and Tricarboxylic Acid Cycle

“…Our previous report demonstrated that the growth at low temperature does clearly induce oxidative stress events in the Antarctic and temperate fungal strains, this being an induction of ROS generation, enhanced level of oxidative damaged proteins, accumulation of reserve carbohydrates and increased activity of antioxidant enzyme defense (18,19,39). On the other hand, it was demonstrated that organisms can overcome oxidative stress by reconfiguration of their metabolite pathways (20).…”

“…Low temperature treatment of Antarctic bacterium Pseudomonas fluorescens MTCC 667 caused increase in the level of ROS and antioxidant enzyme activities (12). Our previous investigations showed a relationship between cold stress and oxidative stress in filamentous fungi isolated from different regions of Antarctica (18,19,39). Low temperature treatment enhanced ROS levels in the Antarctic fungi and cell response against this situation includes alteration in the activities of SOD and catalase (CAT).…”

Transient Cold Shock Induces Oxidative Stress Events in Antarctic Fungi

“…161 and the mesophilic A. glaucus 363, are 20C and 25C, respectively (Tosi et al, 2010). The duration of the temperature shift (6 h) was chosen because this length of time was found to be sufficient to give a clear contrast between the control and the stressed cultures.…”

“…161 and Aspergillus glaucus 363 (with optimal growth temperatures of 20°C and 25°C, respectively), isolated from Livingston Island (South Shetlands archipelago, Antarctica) (Tosi et al, 2010) were used for the experiments. The strains belong to the Mycological collection at the Institute of Microbiology, Sofia, and they were maintained at 4°C on beer agar at pH 6.3.…”

“…In recent years, we have also isolated filamentous fungi from samples taken from another Antarctic region -the permanent Bulgarian Antarctic base "St. Kl. Ohridski" on Livingston Island in the South Shetland Islands (Maritime Antarctica) -during the Bulgarian Antarctic expedition 2006/07 (Tosi et al, 2010). Published data about the filamentous and larger fungi of Livingston Island are scarce (Gray & Smith 1984;Wirtz et al, 2003).…”