期刊
FEMS MICROBIOLOGY ECOLOGY
卷 37, 期 1, 页码 11-19出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1574-6941.2001.tb00848.x
关键词
antenna complex; bacteriochlorophyll d; chlorosome; green sulfur bacterium; light adaptation; Pelodictyon clathratiforme
类别
A population of the green sulfur bacterium Pelodictyon clathratiforme was monitored during the stratification period of Coromina Lake, a freshwater, holomictic pond of the Banyoles lacustrine area (Girona, NE Spain). The chromatographic analysis of this population revealed the presence of a wide variety of both bacteriochlorophyll (BChl) d and BChl c homologues. Isolation of chlorosomes from cultured Pelodictyon cells and their further analysis by steady-state fluorescence indicated that, although both pigment were present in chlorosomes, only BChl c gave rise to an emission signal, suggesting a fast energy transfer from BChl d to BChl c. Likewise, chlorosomes isolated from natural samples were significantly larger (60-70 nm in width and 115-120 nm in length) than those isolated from cells grown in laboratory under optimal light conditions (48 +/-6.8 mn and 100 +/- 15.8 nm. in width and length, respectively). The potential role of heterogeneous BChl c- and BChl d-containing chlorosomes and the differences in chlorosome size measured are discussed in terms of the severe light limitation (available light intensity <0.1 mol photons m(-2) s(-1) at the bacterial plate) under which the population subsisted during the study period. (C) 2001 Federation of European Micro biological Societies. Published by Elsevier Science B.V. All rights reserved.
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