Photosynthetic pigments of oceanic Chlorophyta belonging to prasinophytes clade VII

• Published in: Journal of phycology Vol. 52; no. 1; pp. 148 - 155
• Main Authors: Lopes dos Santos, Adriana, Gourvil, Priscillia, Rodríguez, Francisco, Garrido, José Luis, Vaulot, Daniel, Valentin, K
• Format: Journal Article
• Language: English
• Published: United States Phycological Society of America 01.02.2016; Blackwell Publishing Ltd; Wiley Subscription Services, Inc; Wiley
• Subjects: Algae; antheraxanthin; astaxanthin; Bacillariophyceae; Carotenoids - analysis; Chlorophyll - analysis; Chlorophyta - chemistry; Chlorophyta - classification; Chlorophyta - physiology; coastal water; Earth Sciences; HPLC; Life Sciences; Light; light intensity; Lutein - analysis; neoxanthin; Oceanography; Oceans and Seas; Photosynthesis; phytoplankton; picoplankton; Pigments; Pigments, Biological - analysis; Pigments, Biological - chemistry; prasinophytes; Sciences of the Universe; Tetraselmis; Vegetal Biology; Xanthophylls - analysis; Zeaxanthins - analysis; phytoplankton; pigments; prasinophytes; picoplankton; HPLC; Pigments; Phytoplankton; Picoplankton; Prasinophytes
• ISSN: 0022-3646; 1529-8817
• DOI: 10.1111/jpy.12376

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 RCC287 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, RCC3402 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.