气候变化领域集成服务门户(CCPortal): Nitrate limitation and ocean acidification interact with UV-B to reduce photosynthetic performance in the diatom

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DOI	https://doi.org/10.1594/PANGAEA.851339
	Nitrate limitation and ocean acidification interact with UV-B to reduce photosynthetic performance in the diatom
	Li; Wei; Gao; Kunshan; Beardall; John
发布日期	2015-09-24
数据集类型	dataset
英文关键词	Bottles or small containers/Aquaria ( 20 L) ; Charophyta ; Chromista ; Laboratory experiment ; Laboratory strains ; Light ; Macro-nutrients ; North Atlantic ; Ochrophyta ; Pelagos ; Phaeodactylum tricornutum ; Phytoplankton ; Primary production/Photosynthesis ; Single species
英文简介	It has been proposed that ocean acidification (OA) will interact with other environmental factors to influence the overall impact of global change on biological systems. Accordingly we investigated the influence of nitrogen limitation and OA on the physiology of diatoms by growing the diatom Phaeodactylum tricornutum Bohlin under elevated (1000 µatm; high CO2- HC) or ambient (390 µatm; low CO2-LC) levels of CO2 with replete (110 µmol/L; high nitrate-HN) or reduced (10 ?mol/L; low nitrate-LN) levels of NO3- and subjecting the cells to solar radiation with or without UV irradiance to determine their susceptibility to UV radiation (UVR, 280-400 nm). Our results indicate that OA and UVB induced significantly higher inhibition of both the photosynthetic rate and quantum yield under LN than under HN conditions. UVA or/and UVB increased the cells' non-photochemical quenching (NPQ) regardless of the CO2 levels. Under LN and OA conditions, activity of superoxide dismutase and catalase activities were enhanced, along with the highest sensitivity to UVB and the lowest ratio of repair to damage of PSII. HC-grown cells showed a faster recovery rate of yield under HN but not under LN conditions. We conclude therefore that nutrient limitation makes cells more prone to the deleterious effects of UV radiation and that HC conditions (ocean acidification) exacerbate this effect. The finding that nitrate limitation and ocean acidification interact with UV-B to reduce photosynthetic performance of the diatom P. tricornutum implies that ocean primary production and the marine biological C pump will be affected by OA under multiple stressors.
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/216961
推荐引用方式 GB/T 7714	Li,Wei,Gao,et al. Nitrate limitation and ocean acidification interact with UV-B to reduce photosynthetic performance in the diatom.2015-09-24.https://doi.org/10.1594/PANGAEA.851339.