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Identification and the Relationship Between Substrates Utilization and Photosynthesis in Purple Sulfur Bacteria from Mangrove

Author: ZhaoJiangYan
Tutor: YangSuPing
School: Huaqiao University
Course: Microbiology
Keywords: Mangroves Purple sulfur bacteria Isolation and identification of Substrate Utilization Photosynthesis
CLC: S718.83
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 1
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Abstract


Purple sulfur bacteria appeared about at 3.5Ga years ago , in the origin of life and the Earth's evolution , nature, aquatic ecosystems, carbon and nitrogen sulfur material recycling and energy conversion , and play an important role in maintaining ecosystem balance . In recent years , the discovery of new nitrogen metabolic pathways reveal new carbon metabolism and sulfur metabolic pathways and mechanisms for in-depth understanding of the purple sulfur bacteria in the marine ecosystem carbon and nitrogen and sulfur material recycling and environmental adaptability mechanism laid the foundation. But mostly purple sulfur bacteria is more difficult to obtain pure cultures , strains preserved more difficult to activation and loss , far less purple non - sulfur bacteria breadth and depth of its research , thus digging purple sulfur bacteria resources to carry out its theoretical and applied research significance. The mangrove unique ecological environment , has aroused extensive attention of scholars at home and abroad , now become the research focus of many disciplines . The system has a rich microbial resources and ecological diversity , bears the a unique enzyme resources and genetic resources , has an important role for the promotion of the mangrove ecosystem material cycling and energy flow . Purple sulfur bacteria resources mining this article select the ecological environment of the mangroves , carried out a detailed study of an acid-resistant marine purple sulfur bacteria , the main findings are as follows : use of selective media and agar dilution oscillation method , from Fujian Luoyang mangrove The the intertidal mud samples isolated the 14 purple sulfur bacteria in pure culture . Strain YL28 is a mild acid, the high purple sulfur bacteria containing Rose category carotene , is identified as Marichromatium gracile new strain . Growth conditions optimization results show that the the optimized biomass of 2.69 times the original . Carbon and nitrogen sources on photosynthetic pigment synthesis have a more significant effect on the degree of influence of the sulfur source is smaller . The results can delve into the purple sulfur bacteria in the ocean solar energy utilization and ecological role of carbon and nitrogen in the sulfur cycle , new understanding of the marine carbon and nitrogen sulfur cycle mechanism to lay the foundation .

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Microbiology > Bacterial
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