| 摘要: |
| 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C18:1 w7c 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。 |
| 关键词: 好氧不产氧光合细菌 脂肪酸 环境因子 |
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| 基金项目:国家973 计划项目(2011CB808800); 国家海洋局项目(201105021); 国家基金委项目(41191021) |
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| Impact of environmental factors on fatty acid patterns of aerobic anoxygenic phototrophic bacteria |
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| Abstract: |
| Fatty acid regulation is a crucial acclimation process which seems neglected by investigators of Aerobic anoxygenic phototrophic bacteria (AAPB). In the present study, cellular fatty acid compositions of 9 AAPB strains phylogenetically related to genera Erythrobacter,“Citromicrobium” and Roseobacter clade were analyzed, along with 10 non-AAPB strains for comparison. The dominant fatty acid component in tested strains was C18:1 w7c, which has the highest content in Roseobacter clade. Fatty acid compositions respond differently to environmental factors. Low temperature and oligotrophic conditions mainly affect unsaturated fatty acids (UFAs). An increase of 2-OH fatty acids was detected when nutrient and light act as the joint pressure for AAPB. In addition, taking non-AAPB strains into consideration provided a new perspective in AAPB research and some explanations related to ecological phenomenon were suggested. For example, AAPB may have advantages in cold marine areas owing to the high percentage of UFAs and the heterotrophic ability of AAPB was comparatively weaker than non-AAPB strains. |
| Key words: Aerobic Anoxygenic Phototrophic bacteria Fatty acid Environmental factors |
