Open AccessEndosymbiotic purple non‐sulphur bacteria in an anaerobic ciliated protozoon
Author(s) -
Fenchel Tom,
Bernard Catherine
Publication year - 1993
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1993.tb06289.x
Subject(s) - ciliate , biology , bacteria , bacteriochlorophyll , purple bacteria , anaerobic bacteria , rhodospirillaceae , rhodospirillales , pigment , phototroph , protozoa , sulfur , green sulfur bacteria , botany , anaerobic exercise , microbiology and biotechnology , photosynthesis , carotenoid , photosynthetic reaction centre , chemistry , ecology , physiology , genetics , organic chemistry
The marine ciliate Strombidium purpureum Kahl harbours endosymbiotic purple non‐sulphur bacteria. The bacteria contain bacteriochlorophyll a and the carotenoid spirilloxanthin, and they have photosynthetic membranes and cell walls. The ciliates require light for survival and growth under anaerobic conditions; in the dark the cells prefer microaerobic conditions. The ciliates show a photosensory behaviour, and they accumulate in light at wave lenghts corresponding to the absorption spectrum of the symbionts. The findings are discussed in terms of theories on the endosymbiotic origin of mitochondria.