Diversity of pigmented Gram-positive bacteria associated with marine macroalgae from Antarctica

Little is known about the diversity and roles of Gram-positive and pigmented bacteria in Antarctic environments, especially those associated with marine macroorganisms. This work is the first study about the diversity and antimicrobial activity of culturable pigmented Gram-positive bacteria associat...

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Bibliographic Details
Published in:FEMS Microbiology Letters
Main Authors: Leiva, Sergio, Alvarado, Pamela, Huang, Ying, Wang, Jian, Garrido, Ignacio
Format: Text
Language:English
Published: Oxford University Press 2015
Subjects:
Environmental Microbiology
Antarctic
King George Island
South Shetland Islands
Antarc*
Antarctica
antartic*
Online Access:http://femsle.oxfordjournals.org/cgi/content/short/362/24/fnv206
https://doi.org/10.1093/femsle/fnv206
Description
Summary:Little is known about the diversity and roles of Gram-positive and pigmented bacteria in Antarctic environments, especially those associated with marine macroorganisms. This work is the first study about the diversity and antimicrobial activity of culturable pigmented Gram-positive bacteria associated with marine Antarctic macroalgae. A total of 31 pigmented Gram-positive strains were isolated from the surface of six species of macroalgae collected in the King George Island, South Shetland Islands. On the basis of 16S rRNA gene sequence similarities ≥99%, 18 phylotypes were defined, which were clustered into 11 genera of Actinobacteria ( Agrococcus, Arthrobacter, Brachybacterium, Citricoccus, Kocuria, Labedella, Microbacterium, Micrococcus, Rhodococcus, Salinibacterium and Sanguibacter ) and one genus of the Firmicutes ( Staphylococcus ). It was found that five isolates displayed antimicrobial activity against a set of macroalgae-associated bacteria. The active isolates were phylogenetically related to Agrococcus baldri, Brachybacterium rhamnosum, Citricoccus zhacaiensis and Kocuria palustris . The results indicate that a diverse community of pigmented Gram-positive bacteria is associated with Antartic macroalgae and suggest its potential as a promising source of antimicrobial and pigmented natural compounds.

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