气候变化领域集成服务门户(CCPortal): Seawater carbonate chemistry and growth and chlorophyll, photochemical parameters, carbon fixation of diatom Phaeodactylum tricornutum

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DOI	https://doi.org/10.1594/PANGAEA.900658
	Seawater carbonate chemistry and growth and chlorophyll, photochemical parameters, carbon fixation of diatom Phaeodactylum tricornutum
	Liu; Nana; Beardall; John; Gao; Kunshan
发布日期	2019-04-25
数据集类型	dataset
英文关键词	Bottles or small containers/Aquaria ( 20 L) ; Chromista ; Growth/Morphology ; Laboratory experiment ; Laboratory strains ; Light ; Not applicable ; Pelagos ; Phaeodactylum tricornutum ; Phytoplankton ; Primary production/Photosynthesis ; Single species
英文简介	Elevated CO2 is leading to a decrease in pH in marine environments (ocean acidification [OA]), altering marine carbonate chemistry. OA can influence the metabolism of many marine organisms; however, no consensus has been reached on its effects on algal photosynthetic carbon fixation and primary production. Here, we found that when the diatom Phaeodactylum tricornutum was grown under different pCO2 levels, it showed different responses to elevated pCO2 levels under growth-limiting (20 µmol photons/m2/s, LL) compared with growth-saturating (200 µmol photons/m2/s, HL) light levels. With pCO2 increased up to 950 µatm, growth rates and primary productivity increased, but in the HL cells, these parameters decreased significantly at higher concentrations up to 5000 µatm, while no difference in growth was observed with pCO2 for the LL cells. Elevated CO2 concentrations reduced the size of the intracellular dissolved inorganic carbon (DIC) pool by 81% and 60% under the LL and HL levels, respectively, with the corresponding photosynthetic affinity for DIC decreasing by 48% and 55%. Little photoinhibition was observed across all treatments. These results suggest that the decreased growth rates under higher CO2 levels in the HL cells were most likely due to acid stress. Low energy demand of growth and energy saving from the down-regulation of the CO2 concentrating mechanisms (CCM) minimized the effects of acid stress on the growth of the LL cells. These findings imply that OA treatment, except for down-regulating CCM, caused stress on the diatom, reflected in diminished C assimilation and growth rates.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215872
推荐引用方式 GB/T 7714	Liu,Nana,Beardall,et al. Seawater carbonate chemistry and growth and chlorophyll, photochemical parameters, carbon fixation of diatom Phaeodactylum tricornutum.2019-04-25.https://doi.org/10.1594/PANGAEA.900658.