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海洋科学  2012 

环境因子对好氧不产氧光合细菌脂肪酸组成的影响

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Keywords: 好氧不产氧光合细菌,脂肪酸,环境因子

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Abstract:

对赤杆菌属(Erythrobacter)、柠檬酸微菌属(Citromicrobium)和玫瑰杆菌(Roseobacter)分支的9株好氧不产氧光合细菌(AAPB)的脂肪酸组成进行分析,并以10株非AAPB菌为参照,从脂肪酸角度考察光照、温度、营养等重要环境因子对AAPB的影响。结果显示,AAPB的脂肪酸以C18:1w7c为主,该成分在Roseobacter分支中含量最高,不同种脂肪酸对环境因子的响应不同,低温和寡营养条件主要作用于不饱和脂肪酸(UFA);二羟基脂肪酸在寡营养和光照双重作用下有较明显的升高。此外,结合非AAPB的比较也为AAPB脂肪酸研究提供了新的视角,如温度实验显示,由于不饱和脂肪酸的比例较高,AAPB可能在寒冷海域有更好的竞争优势,而从饥饿培养试验来看,AAPB的异养能力似乎比非AAPB更弱。

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