| Environmental control of growth and BChl a expression in an aerobic anoxygenic phototrophic bacterium, Erythrobacter longus (DSMZ6997) |
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| 作者姓名： | LI Qiang JIAO Nianzhi PENG Zaiqing |
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| 作者单位： | LI Qiang 1，JIAO Nianzhi 1*，PENG Zaiqing 1 1. State Key Laboratory of Marine Environmental Science，Xiamen University，Xiamen 361005，China |
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| 基金项目： | 国家自然科学基金;科技部资助项目 |
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| 摘 要： | 1Introduction Aerobic anoxygenic phototrophic bacteria(AAPB) are facultative heterotrophs that can utilizelight for photosynthesis. These unique-functioningbacteria are widely distributed in marine environ-ments, such as coastal waters (Shiba et al., 1991…
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| 关 键 词： | 需氧细菌 光合成 海洋环境 海水化学 |
| 收稿时间： | 2006-06-28 |
| 修稿时间： | 2006-09-04 |
Environmental control of growth and BChl a expression in an aerobic anoxygenic phototrophic bacterium, Erythrobacter longus (DSMZ6997) |
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| LI Qiang,JIAO Nianzhi,PENG Zaiqing.Environmental control of growth and BChl a expression in an aerobic anoxygenic phototrophic bacterium, Erythrobacter longus (DSMZ6997)[J].Acta Oceanologica Sinica,2006,25(6):138-144. |
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| Authors: | LI Qiang JIAO Nianzhi and PENG Zaiqing |
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| Institution: | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China |
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| Abstract: | Aerobic anoxygenic phototrophic bacteria (AAPB), which form a unique functional group of heterotrophic bacteria, have the ability to utilize light energy. The impact of carbon source and light intensity on the growth and bacteriochlorophyll a (BChl a) expression of a typical strain of AAPB, Erythrobacter longus strain DSMZ6997 was examined during batch culture and continuous culture. The results showed that the expression of BChl a in DSMZ6997 was regulated by both carbon-source and light conditions, and was stimulated by low availability of carbon but inhibited by light to a certain extent at 300 lx and completely at 1 500 lx. In contrast, cell abundance, and even cell size of this strain, was substantially enhanced under light/dark cycle cultivation conditions over dark conditions, indicating the promotion of growth by light. These results led to the conclusion that utilization of light through BChl a helps AAPB to survive under carbon stress, while light at high intensity is harmful to the synthesis of BChl a in AAPB. |
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| Keywords: | aerobic anoxygenic phototrophic bacteria (AAPB) bacteriochlorophyll a (BChl a) continuous culture |
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