title: Photosynthetic pigments of oceanic Chlorophyta belonging to prasinophytes clade VII.
abstract: 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.
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, Roscoff, 29680, France.
authors.forename: Adriana
authors.initials: A
authors.lastname: Lopes Dos Santos
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, Roscoff, 29680, France.
authors.forename: Priscillia
authors.initials: P
authors.lastname: Gourvil
authors.affiliation: Instituto Español de Oceanografia (IEO), Centro Oceanográfico de Vigo, Subida a Radio Faro, Vigo, 36390, España.
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodríguez
authors.affiliation: Instituto de Investigaciones Marinas (CSIC), Av. Eduardo Cabello, 6, Vigo, 36208, España.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Garrido
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, Roscoff, 29680, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Vaulot
mesh_terms: D002338:Carotenoids / Q000032:analysis; D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D000460:Chlorophyta / Q000737:chemistry* / Q000145:classification* / Q000502:physiology; D008027:Light; D014975:Lutein / Q000032:analysis; D009792:Oceans and Seas; D010788:Photosynthesis; D010860:Pigments, Biological / Q000032:analysis* / Q000737:chemistry; D024341:Xanthophylls / Q000032:analysis; D065146:Zeaxanthins / Q000032:analysis
chemical_list: D010860:Pigments, Biological; D024341:Xanthophylls; D065146:Zeaxanthins; C031140:antheraxanthin; D002734:Chlorophyll; D002338:Carotenoids; C103105:diatoxanthin; C011947:neoxanthin; D014975:Lutein; D000077194:Chlorophyll A
keywords: HPLC; phytoplankton; picoplankton; pigments; prasinophytes