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| 海南常见红树植物叶片脂肪酸组成 |
| 杨睿尧,谢丽梅,安文硕,陈顺洋,陈彬,陈光程 |
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| (上海海洋大学海洋科学学院, 上海 201306;自然资源部第三海洋研究所, 福建 厦门 361005;厦门大学环境与生态学院, 福建 厦门 361005;自然资源部北部湾滨海湿地生态系统野外科学观测研究站, 广西 北海 536015) |
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| 摘要: |
| 脂肪酸的组成分析对认识红树植物脂肪酸资源、红树林生态系统内部的营养关系、食物网的结构，以及红树植物对生境的适应等具有重要参考价值。本研究分析了海南岛铁炉港和清澜港两个港湾的红海榄（Rhizophora stylosa）、杯萼海桑（Sonneratia alba）、木果楝（Xylocarpus granatum）、角果木（Ceriops tagal）、榄李（Lumnitzera racemosa）、木榄（Bruguiera gymnorrhiza）和正红树（Rhizophora apiculata）等7种不同红树植物叶片中脂肪酸的组成及含量。在样品中共检测出25种脂肪酸，其中月桂酸、棕榈酸和肉豆蔻酸等8种存在于所有样品中。样品中含量最高的饱和脂肪酸均为棕榈酸（占比44.32%），其次为硬脂酸（占比7.74%），不饱和脂肪酸含量较高的有油酸（占比7.61%）、亚油酸（占比9.81%）和二十碳烯酸（占比12.16%）。植物样品的脂肪酸不饱和指数为0.24~1.13。除木果楝和清澜港采集的木榄样品外，其余样品种的不饱和脂肪酸含量均低于饱和脂肪酸。铁炉港的红海榄、杯萼海桑、角果木和榄李4种植物叶片不饱和脂肪酸含量高于清澜港同一物种的，而木榄的不饱和脂肪酸含量则表现为清澜港高于铁炉港。脂肪酸组成上，木果楝和正红树在两个港湾的相似性高于其他红树植物，棕榈酸、二十碳烯酸和亚油酸是造成红树植物脂肪酸组成差异的主要组分。本研究的结果表明红树植物的脂肪酸组成与物种和区域有关，而热带地区红树植物可能具有不饱和脂肪酸含量低的特点。 |
| 关键词: 海洋生物学 红树 叶片脂肪酸 特征脂肪酸 脂肪酸不饱和指数 |
| DOI：10.3969/J.ISSN.2095-4972.20220329001 |
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| 基金项目:福建省自然科学基金（2020J06030）; 国家自然科学基金（42176171）;自然资源部第三海洋研究所基本科研业务费（海三科2020017） |
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| Leaf fatty acid composition of common mangrove species in Hainan |
| YANG Ruiyao,XIE Limei,AN Wenshuo,CHEN Shunyang,CHEN Bin,CHEN Guangcheng |
| (College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Third Institute of Oceanography, MNR, Xiamen 361005, China;College of Environment and Ecology, Xiamen University, Xiamen 361005, China;Department of Natural Resources Beibu Gulf Coastal Wetland Ecosystem Field Scientific Observation and Research Station, Beihai 536015, China) |
| Abstract: |
| The fatty acid composition has important reference value for understanding the fatty acid resources of mangrove plants. The nutritional relationship within the mangrove ecosystem, the structure of food web and the adaptation of mangrove plants to habitat. In this study, composition and relative content of fatty acids in leaves of 7 mangrove species were analyzed, they were Rhizophora stylosa, Sonneratia alba, Xylocarpus granatum, Ceriops tagal, Lumnitzera racemosa, Bruguiera gymnorrhiza andRhizophora apiculata collected from Tielugang Bay in Sanya City and Qinglangang Bay in Wenchang City, Hainan, China. As results, a total of 25 species of fatty acids were recorded, and 8 fatty acids including lauric acid, palmitic acid and myristic acid were found in all samples. Palmitic acid had the highest average content (44.32%) among saturated fatty acids in the samples, followed by stearic acid (7.74%) and the unsaturated fatty acids with relative high contents of oleic acid (7.61%), linoleic acid (9.81%) and eicosanoid acid (12.16%). Ratio of unsaturated fatty acids in mangrove leaf samples fell within a range of 0.24-1.13. Unsaturated fatty acid had a lower proportion than that of saturated fatty acids in most samples, except in samples of X. granatum and B. gymnorrhiza (in Qinglangang). The proportion of unsaturated fatty acids in 4 species, i.e. R. stylosa, S. alba, C. tagal and L. racemose were higher in Tielugang samples than in Qinglangang samples, while the proportion in B. gymnorrhiza leaves was higher in Qinglangang samples. In terms of fatty acid composition, X. granatum and R. apiculate had higher similarity between the two sampling locations than those of other pairs of mangrove species. Difference in fatty acid composition among different leaf samples was mainly attributed to the variations of the contents of palmitic acid, linoleic acid and eicosanoid acid. Results suggested that the fatty acid composition of mangrove leaf samples was related to mangrove species and the sampling location, and the mangrove leaves in tropical areas might have generally low proportion of unsaturated fatty acids. |
| Key words: marine biology mangrove leaf fatty acids characteristic fatty acids unsaturated ratio of fatty acids |