Identification of Antarctic bacteria with antimicrobial activity isolated from the rhizosphere of Deschampsia antarctica Desv.
AIP
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Keywords

Antarctic bacteria
antimicrobial compounds
Pseudomonas
rhizospheric bacteria

How to Cite

Orellana, P., Pavón, A., Calisto Ulloa, N. C., Wiese, G., Navarro, L., Cortés-Cortés, P., Gidekel, M., Gutiérrez-Moraga, A., & Corsini, G. (2022). Identification of Antarctic bacteria with antimicrobial activity isolated from the rhizosphere of Deschampsia antarctica Desv. Anales Del Instituto De La Patagonia, 50. https://doi.org/10.22352/AIP202250002

Abstract

The sustained decrease in the availability of new antimicrobial molecules for therapeutic use in recent decades and the large increase in microorganisms resistant to these compounds makes it necessary to search for new substances with antimicrobial properties.

Extreme environments, where there is little availability of nutrients, are favorable scenarios to search for this type of compounds, since bacteria compete with other bacteria or other organisms to position themselves in the ecological niche and secrete, associated with their secondary metabolism, a series of molecules that inhibit or kill other microorganisms thus preventing their proliferation.

Our group has a collection of soil bacteria from the Antarctic continent that has ability to grow under conditions of food deprivation and at 4ºC. Due to the extreme habitat where they develop, Antarctic soil bacteria are in constant competition for nutritional resources and therefore develop different strategies to colonize their ecological niche and compete with other microorganisms of the Antarctic microbiota. That is why we propose in this work that bacteria isolated from Antarctic soils are capable of synthesizing (secreting) molecules with the ability to inhibit not only the growth of microorganisms in their environment, but also of bacteria and fungi that are pathogenic for humans.

From a collection of 55 rhizosphere isolates of the Deschampsia antarctica Desv. we identified 11 isolates with the capacity to eliminate human pathogenic bacteria, but no isolate from the collection eliminated the Candida albicans fungus. The 11 Antarctic bacteria with antibacterial capacity are strict aerobic Gram-negative bacilli, with characteristics belonging to the genus Pseudomonas.

https://doi.org/10.22352/AIP202250002
PDF (Español (España))

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