Utilization of light energy and adaptation strategy for starvation of bacteria in natural microbial communities

4种紫色光合细菌均能在极低有机养分条件下利用光能生存。在温泉微生物群落中，水中提供低浓度的电子，在光合细菌的帮助下，随着群落中电子的不断循环，生物量得以增长。在循环过程中，氢气的产生和消耗起着重要的作用。在低营养湖泊和池塘中，部分反硝化光合细菌参与了非光合细菌的反硝化作用。

Purple photosynthetic bacteria were able to survive under the conditions of very low organic nutrients by using light energy in examined 4 species. In the microbial community of hot springs, in which low concentrations of electrons are provided from the water, the biomass grows with continuous cycling of the electrons in the community with the help of photosynthetic bacteria. In the cycling, hydrogen production and consumption play important roles. In the oligotrophic lakes and ponds, partially denitrifying photosynthetic bacteria were involved in the denitrification with non-photosynthetic bacteria.