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Pseudopleurochloris antarctica gen. et sp. nov., a new coccoid xanthophycean from pack-ice of Wood Bay (Ross Sea, Antarctica): ultrastructure, pigments and 18S rRNA gene sequence

Published online by Cambridge University Press:  01 May 1999

CARLO ANDREOLI ,
ISABELLA MORO ,
NICOLETTA LA ROCCA ,
FERNANDA RIGONI ,
LUISA DALLA VALLE  and
LUCA BARGELLONI
CARLO ANDREOLI
Affiliation:
Department of Biology, University of Padua, Via Ugo Bassi 58/b, I-35131 Padua, Italy
ISABELLA MORO
Affiliation:
Department of Biology, University of Padua, Via Ugo Bassi 58/b, I-35131 Padua, Italy
NICOLETTA LA ROCCA
Affiliation:
Department of Biology, University of Padua, Via Ugo Bassi 58/b, I-35131 Padua, Italy
FERNANDA RIGONI
Affiliation:
Department of Biology, University of Padua, Via Ugo Bassi 58/b, I-35131 Padua, Italy
LUISA DALLA VALLE
Affiliation:
Department of Biology, University of Padua, Via Ugo Bassi 58/b, I-35131 Padua, Italy
LUCA BARGELLONI
Affiliation:
Department of Biology, University of Padua, Via Ugo Bassi 58/b, I-35131 Padua, Italy
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Abstract

A microalga was isolated from the pack-ice of Wood Bay (Antarctica) during austral summer 1993–4. By comparison with an authentic strain obtained from Sammlung von Algenkulturen at the University of Göttingen (SAG 860–3), its ultrastructural details and pigment composition were very similar to those of Pleurochloris meiringensis. However, sequence analysis of the entire 18S rRNA gene revealed substantial genetic divergence (57 nucleotide substitutions and 19 insertions/deletions) between SAG 860–3 and the Antarctic isolate. Phylogenetic analysis of complete 18S rRNA gene sequences from 18 microalgal species, including the two strains studied, rejected the hypothesis that the Antarctic isolate is the sister species to Pleurochloris meiringensis. Molecular evidence indicates that the Antarctic isolate is the sister group of a clade that comprises two other representatives of the Xanthophyceae (synonym Tribophyceae): Pleurochloris meiringensis and Botrydiopsis intercedens. This leads us to conclude that this microalga is a new species belonging to a new genus and the name Pseudopleurochloris antarctica is proposed.

Keywords

Pseudopleurochloris antarctica gen. et sp. nov.Ross SeaWood BayXanthophyceae
Type
Research Article
Information
European Journal of Phycology , Volume 34 , Issue 2 , May 1999 , pp. 149 - 159
Copyright
© 1999 British Phycological Society

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