LONG-CHAIN (N-C37-C39) ALKENONES IN THE PRYMNESIOPHYCEAE - DISTRIBUTION OF ALKENONES AND OTHER LIPIDS AND THEIR TAXONOMIC SIGNIFICANCE
LONG-CHAIN (N-C37-C39) ALKENONES IN THE PRYMNESIOPHYCEAE - DISTRIBUTION OF ALKENONES AND OTHER LIPIDS AND THEIR TAXONOMIC SIGNIFICANCE
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DOI：
10.1080/00071618400650221
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发表时间：
1984-01-01
期刊：
影响因子：
--
通讯作者：
COURSE, PA
中科院分区：
文献类型：
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作者：
MARLOWE, IT;GREEN, JC;COURSE, PA
长链（C37-C39）n-烯酮、多不饱和n-C36酸的酯和C27-C29甾醇在13种植物中进行了检测。初步鉴定出9个属，具有化学分类学价值。酮和酯分别存在于片叶金藻和3个种中。的Isochrysis;他们在Emiliania huxleyi的存在得到证实。它们不存在于等鞭金藻目的其他5个成员中，也不存在于所检查的球球藻目、Prymnesiales和Pavlovales的代表中。这种区别反映在甾醇的分布中，所有5种上述种类都具有高浓度的24-甲基胆甾-5，22 E-二烯-3 β-酮。醇相对于胆甾-5-烯-3 β-醇（胆固醇）。相比之下，前者甾醇是Prymnesiales和Pavlovales成员中的次要组分或不存在。甾醇分布表明，目前包括在等鞭金藻目中的一些种类（例如，Ochrosphaera）与Prymnesiales的物种有较近的亲缘关系。因此，等鞭金藻目不是一个自然的分类单位。卢氏巴夫藻具有与等鞭藻目和Prymnesiales的成员相同的甾醇和脂肪酸，这表明巴夫藻目是Prymnesiophyceae中相对古老的类群。烃，脂肪酸和类胡萝卜素类内的分布可以提供额外的信息，在孤立的情况下分类价值。
Long chain (C37-C39) n-alkenones, esters of polyunsaturated n-C36 acids and C27-C29 sterols were examined in 13 spp. from 9 genera of algae from the class Prymnesiophyceae and apparently have chemotaxonomic value. The alkenones and esters occur in Chrysotila lamellosa and 3 spp. of Isochrysis; their presence in Emiliania huxleyi was confirmed. They were absent from 5 other members of the order Isochrysidales, and from those representatives of the orders Coccosphaerales, Prymnesiales and Pavlovales examined. This discrimination was reflected in the distribution of the sterols, all 5 of the above species having high concentrations of 24-methylcholesta-5,22E-dien-3.beta.-ol relative to cholest-5-en-3.beta.-ol (cholesterol). In contrast, the former sterol is a minor component in, or is absent from, members of the Prymnesiales and Pavlovales. The sterol distributions suggest that some species at present included in the Isochrysidales (e.g., Ochrosphaera) have closer affinities with species of the Prymnesiales. The Isochrysidales is therefore not a natural taxonomic unit. Pavlova lutheri has sterols and fatty acids in common with members of the Isochrysidales and Prymnesiales, suggesting that the Pavlovales are a relatively ancient group within the Prymnesiophyceae. The distribution of hydrocarbons, fatty acids and carotenoids within the class can provide additional information of taxonomic value in isolated instances.