Polar Biology

, Volume 41, Issue 3, pp 469–480 | Cite as

Phenotypic and genotypic characterization of a novel multi-antibiotic-resistant, alginate hyperproducing strain of Pseudomonas mandelii isolated in Antarctica

  • Sebastián Higuera-Llantén
  • Felipe Vásquez-Ponce
  • Matías Núñez-Gallegos
  • María Soledad Pavlov
  • Sergio Marshall
  • Jorge Olivares-PachecoEmail author
Original Paper


Until recently, it was thought that Antarctica was a sterile continent due to extreme environmental conditions. In fact, this cold continent is one of the most diverse in terms of microorganisms. In the present study, the bacterial isolate Pseudomonas sp. 6A1 was obtained from marine sediments originating from the Fildes Peninsula Bay, King George Island, Antarctica. Subsequently, this isolate was identified as Pseudomonas mandelii. To arrive at this conclusion, molecular studies were performed using the 16S rRNA and multilocus sequence analysis. Both techniques were used to construct phylogenetic trees, revealing 99.99% similarity between the 6A1 strain and P. mandelii. To provide phenotypic support for this finding, BIOLOG GN2 and API20 NE tests, as well as assimilation assays with different carbon sources, were performed. These tests revealed 87% similarity with P. mandelii. This result was primarily due to an inability of the 6A1 strain to reduce nitrates, as well as to variations in the assimilation of different carbon sources. Another important phenotypic difference was alginate hyperproduction by 6A1, a trait never before described in a P. mandelii strain. Finally, the 6A1 strain was found to present multiple antibiotic resistances. Altogether, these results confirm the first case of P. mandelii isolation from the Antarctic.


Antarctic Pseudomonas P. mandelii MLSA Alginate hyperproducer Multiresistant bacteria 



We would like to thank Dr. Marcelo González of the Chilean Antarctic Institute (INACH) for providing us with the Pseudomonas sp. 6A1 strain.


This work was funded by the “Dirección de Investigación,” Pontificia Universidad Católica de Valparaíso (Project DI 037.431/2015) and by INACH (Doctorate Project DT_02-13).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Sebastián Higuera-Llantén
    • 1
  • Felipe Vásquez-Ponce
    • 1
  • Matías Núñez-Gallegos
    • 1
  • María Soledad Pavlov
    • 1
  • Sergio Marshall
    • 1
    • 2
  • Jorge Olivares-Pacheco
    • 1
    Email author
  1. 1.Laboratorio de Genética e Inmunología Molecular, Instituto de Biología, Facultad de CienciasPontificia Universidad Católica de ValparaísoValparaísoChile
  2. 2.Fraunhofer Chile Research, Foundation on System BiotechnologySantiagoChile

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