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Photosynthetic pigments of oceanic Chlorophyta belonging to prasinophytes clade VII
Author(s) -
Lopes dos Santos Adriana,
Gourvil Priscillia,
Rodríguez Francisco,
Garrido José Luis,
Vaulot Daniel
Publication year - 2016
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/jpy.12376
Subject(s) - biology , haptophyte , clade , algae , botany , neoxanthin , chlorophyta , ecology , phylogenetics , zeaxanthin , gene , carotenoid , genetics , phytoplankton , lutein , nutrient
The ecological importance and diversity of pico/nanoplanktonic algae remains poorly studied in marine waters, in part because many are tiny and without distinctive morphological features. Amongst green algae, Mamiellophyceae such as Micromonas or Bathycoccus are dominant in coastal waters while prasinophytes clade VII, yet not formerly described, appear to be major players in open oceanic waters. The pigment composition of 14 strains representative of different subclades of clade VII was analyzed using a method that improves the separation of loroxanthin and neoxanthin. All the prasinophytes clade VII analyzed here showed a pigment composition similar to that previously reported for RCC 287 corresponding to pigment group prasino‐2A. However, we detected in addition astaxanthin for which it is the first report in prasinophytes. Among the strains analyzed, the pigment signature is qualitatively similar within subclades A and B. By contrast, RCC 3402 from subclade C ( Picocystis ) lacks loroxanthin, astaxanthin, and antheraxanthin but contains alloxanthin, diatoxanthin, and monadoxanthin that are usually found in diatoms or cryptophytes. For subclades A and B, loroxanthin was lowest at highest light irradiance suggesting a light‐harvesting role of this pigment in clade VII as in Tetraselmis .