Hyposalinity affects diurnal photoacclimation patterns in the rhodophyte Palmaria palmata under mimicked Arctic summer conditions: raw data from laboratory physiological measurements@en

The Arctic is one area that has been affected by rising temperatures, leading to an increase in meltwater in the water column. During the months of June/July 2019, fronds of the red seaweed Palmaria palmata in Kongsfjorden, Svalbard (78°55'56.0N 11°55'59.6E) were colected in the intertidal zone. For 21 days at 0ºC, P. palmata was subjected to variations of irradiance cycles and three different salinities SA 34 (control), 28 and 18 in laboratory conditions. Subsequently, measurements in triplicate (n=3) were made of photosynthetic parameters such as maximal quantum yield of PSII (Fv/Fm), non-photochemical quenching (NPQ), biochemical parameters such as quantification of pigments chlorophyll a (Chl a), lutein (Lut), zeaxanthin (Zeax), β-carotene (β-Car), and antioxidant activity 2,2-diphenyl-1-picrylhydrazyl (DPPH).北极是受气温升高影响最为显著的区域之一，由此导致水柱中的融水含量显著上升。2019年6至7月间，研究人员在斯瓦尔巴群岛孔斯峡湾（Kongsfjorden，78°55'56.0N 11°55'59.6E）的潮间带采集了红藻掌状紫膜藻（Palmaria palmata）的叶状藻体。在实验室条件下，将掌状紫膜藻置于0℃环境中，设置3种盐度梯度：盐度34（SA 34，对照组）、28与18，并施加不同辐照度周期处理，持续培养21天。随后以3次重复（n=3）开展多项指标测定：光合参数包括光系统II（PSII）的最大量子产量（Fv/Fm）与非光化学淬灭（NPQ）；生化参数则涵盖叶绿素a（Chl a）、叶黄素（Lut）、玉米黄质（Zeax）、β-胡萝卜素（β-Car）等色素的定量检测，以及2,2-二苯基-1-苦基肼基（DPPH）抗氧化活性测定。