Jiang Hongchen, Dong Hailiang, Yu Bingsong, Lv Guo, Deng Shicai, Wu Yajie, Dai Minghan, Jiao Nianzhi
Geomicrobiology Laboratory, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, China.
FEMS Microbiol Ecol. 2009 Feb;67(2):268-78. doi: 10.1111/j.1574-6941.2008.00616.x. Epub 2008 Nov 4.
Aerobic anoxygenic phototrophic (AAP) bacteria are heterotrophic prokaryotes that are capable of utilizing light as an energy source but are not capable of producing molecular oxygen. Recently, multiple studies have found that AAP bacteria are widely distributed in oceans and estuaries and may play an important role in carbon cycling. However, AAP bacteria in inland lake ecosystems have not been investigated in depth. In this study, the abundance and diversity of the pufL-M genes, encoding photosynthetic reaction centers of AAP bacteria, were determined in the oxic water column and anoxic sediments of saline lakes (Qinghai, Erhai, and Gahai Lakes) on the Tibetan Plateau, China. Our results indicated that AAP bacteria were abundant in inland lakes, with the proportion of AAP bacteria (in total bacteria) comparable to those in the oceans, but with a lower diversity. Salinity and pH were found to be potential factors controlling the AAP bacterial diversity and community composition. Our data have implications for a better understanding of the potential role of AAP bacteria in carbon cycling in inland lake ecosystems.
好氧不产氧光合（AAP）细菌是一类异养原核生物，它们能够利用光作为能源，但不能产生分子氧。最近，多项研究发现AAP细菌广泛分布于海洋和河口，可能在碳循环中发挥重要作用。然而，内陆湖泊生态系统中的AAP细菌尚未得到深入研究。在本研究中，我们测定了中国青藏高原盐湖（青海湖、洱海和尕海）有氧水柱和缺氧沉积物中编码AAP细菌光合反应中心的pufL-M基因的丰度和多样性。我们的结果表明，内陆湖泊中AAP细菌数量丰富，AAP细菌（占总细菌的比例）与海洋中的相当，但多样性较低。研究发现盐度和pH值是控制AAP细菌多样性和群落组成的潜在因素。我们的数据有助于更好地理解AAP细菌在内陆湖泊生态系统碳循环中的潜在作用。
