title: Salinity affects the photoacclimation of Chlamydomonas raudensis Ettl UWO241.
abstract: Chlamydomonas raudensis Ettl UWO241, a natural variant of C. raudensis, is deficient in state transitions. Its habitat, the deepest layer of Lake Bonney in Antarctica, features low irradiance, low temperature, and high salinity. Although psychrophily and low-light acclimation of this green alga has been described, very little information is available on the effect of salinity. Here, we demonstrate that this psychrophile is halotolerant, not halophilic, and it shows energy redistribution between photosystem I and II based on energy spillover under low-salt conditions. Furthermore, we revealed that C. raudensis exhibits higher non-photochemical quenching in comparison with the mesophile Chlamydomonas reinhardtii, when grown with low-salt, which is due to the lower proton conductivity across the thylakoid membrane. Significance of the C. raudensis UWO241 traits found in the low salinity culture are implicated with their natural habitats, including the high salinity and extremely stable light environments.
authors.affiliation: Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Takizawa
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Takahashi
authors.forename: Norman P A
authors.initials: NP
authors.lastname: Hüner
authors.forename: Jun
authors.initials: J
authors.lastname: Minagawa
mesh_terms: D000064:Acclimatization / Q000187:drug effects*; D000818:Animals; D002696:Chlamydomonas / Q000145:classification / Q000187:drug effects* / Q000528:radiation effects*; D004305:Dose-Response Relationship, Drug; D008027:Light; D010788:Photosynthesis / Q000502:physiology; D012965:Sodium Chloride / Q000494:pharmacology*; D020524:Thylakoids / Q000187:drug effects / Q000648:ultrastructure
chemical_list: D012965:Sodium Chloride