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首页> 外文期刊>Marine biology >Trophic upgrading of long-chain polyunsaturated fatty acids by polychaetes: a stable isotope approach using Alitta virens
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Trophic upgrading of long-chain polyunsaturated fatty acids by polychaetes: a stable isotope approach using Alitta virens

机译：聚氯乙烯长链多不饱和脂肪酸的营养促进促进：铝缺乏稳定的同位素方法

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摘要

Polychaete worms are rich sources of polyunsaturated fatty acids (PUFA) and are increasingly incorporated into aquaculture broodstock diets. Conventionally, the build-up of PUFA in polychaetes was considered passive, with direct accumulation along the food web, originating with microalgae and other primary producers. However, it has been argued that polychaetes (and other multicellular eukaryotes) are capable of PUFA biosynthesis through the elongation and desaturation of precursor lipids. We further test this hypothesis in the ecologically and economically important nereid polychaete Alitta virens by adopting a stable isotope labelling approach. Worms were fed a C-13-1-palmitic acid (C16:0) enriched diet with the resulting isotopically enriched lipid products identified over a 7-day period. The data showed strong evidence of lipid elongation and desaturation, but with a high rate of PUFA turnover. A putative biosynthetic pathway is proposed, terminating with docosahexaenoic acid (DHA) via arachidonic (AA) and eicosapentaenoic acids (EPA) and involving a Delta 8 desaturase.
机译：多芯片蠕虫是丰富的多不饱和脂肪酸（PUFA）的来源，越来越多地纳入水产养殖中养殖饮食。传统上，Pufa在多重聚集中的积聚被认为是被动的，沿着食物网直接积累，源自微藻和其他主要生产商。然而，已经认为聚芯（和其他多细胞真核仪）能够通过前体脂质的伸长和去饱和来进行PUFA生物合成。我们通过采用稳定的同位素标记方法进一步在生态和经济上重要的内视聚铬赛alitta Virens中测试这一假设。将蠕虫喂养C-13-1棕榈酸（C16：0）富集的饮食，得到的同位素富集的脂质产物在7天内鉴定。该数据显示出脂质伸长和去饱和的强有力证据，但具有高的PUFA周转率。提出了一种推定的生物合成途径，终止于甲磺酸（AA）和己二辛烯酸（ECOSapentaeno酸（EPA）并涉及Delta 8去饱和酶。

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  • 来源
    《Marine biology》 |2021年第5期|67.1-67.13|共13页
  • 作者

    Pairohakul Supanut; Olive Peter J. W.; Bentley Matthew G.; Caldwell Gary S.;

  • 作者单位

    Newcastle Univ Sch Nat & Environm Sci Newcastle Upon Tyne NE1 7RU Tyne & Wear England|Chulalongkorn Univ Dept Marine Sci Bangkok Thailand;

    Newcastle Univ Sch Nat & Environm Sci Newcastle Upon Tyne NE1 7RU Tyne & Wear England;

    Newcastle Univ Singapore SIT NYP Bldg Suntec City 567739 Singapore;

    Newcastle Univ Sch Nat & Environm Sci Newcastle Upon Tyne NE1 7RU Tyne & Wear England;

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