Gradients in intact polar diacylglycerolipids across the Mediterranean Sea are related to phosphate availability
Gradients in intact polar diacylglycerolipids across the Mediterranean Sea are related to phosphate availability
复制标题
地中海完整极性二酰基甘油脂的梯度与磷酸盐的可用性有关
DOI：
10.5194/bg-8-3733-2011
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发表时间：
2011
期刊：
影响因子：
4.9
通讯作者：
B. V. Mooy
中科院分区：
文献类型：
--
作者：
Kimberly J. Popendorf;Tsuneo Tanaka;M. Pujo;A. Lagaria;C. Courties;P. Conan;L. Oriol;L. E. Sofen;T. Moutin;B. V. Mooy
抽象的。完整的极性膜脂构成了浮游生物细胞物质的重要组成部分，它们的合成对浮游生物的营养需求造成了很大的限制。作为从少营养型到超少营养型地中海(BUOM)游轮的生物地球化学的一部分，我们研究了几类完整的极地双甘油酯(IP-DAGs)在地中海的分布，发现磷脂浓度占总脂的百分比与磷酸盐浓度有关。此外，地中海沿岸非磷脂与磷脂的比率--磺基喹诺酮二酰甘油(SQDG)与磷脂酰甘油(PG)以及甜菜碱脂与磷脂酰胆碱(PC)--的比率也从西向东递增。此外，用磷酸盐和铵对来自地中海的小宇宙孵化进行了修改，在几天的过程中，营养修改引起了IP-DAG比率的变化。这些实验被用来评估群落变化和生理反应对观测到的跨地中海IP-DAG变化的相对贡献。此外，还探讨了SQDG与叶绿素a的比值作为浮游植物对氮素有效性反应的指标。这项研究首次证明了天然混合浮游生物群落中膜脂组成对营养物质变化的动态响应。
Abstract. Intact polar membrane lipids compose a significant fraction of cellular material in plankton and their synthesis imposes a substantial constraint on planktonic nutrient requirements. As a part of the Biogeochemistry from the Oligotrophic to the Ultraoligotrophic Mediterranean (BOUM) cruise we examined the distribution of several classes of intact polar diacylglycerolipids (IP-DAGs) across the Mediterranean, and found that phospholipid concentration as a percent of total lipids correlated with phosphate concentration. In addition, the ratios of non-phosphorus lipids to phospholipids – sulfoquinovosyldiacylglycerol (SQDG) to phosphatidylglycerol (PG), and betaine lipids to phosphatidylcholine (PC) – were also found to increase from west to east across the Mediterranean. Additionally, microcosm incubations from across the Mediterranean were amended with phosphate and ammonium, and in the course of several days nutrient amendments elicited a shift in the ratios of IP-DAGs. These experiments were used to assess the relative contribution of community shifts and physiological response to the observed change in IP-DAGs across the Mediterranean. The ratio of SQDG to chlorophyll-a was also explored as an indicator of phytoplankton response to nitrogen availability. This study is the first to demonstrate the dynamic response of membrane lipid composition to changes in nutrients in a natural, mixed planktonic community.
影响因子：
3.9
作者：
BENNING, C;HUANG, ZH;GAGE, DA
通讯作者：
GAGE, DA