ISSN:
1432-072X
Keywords:
Photosynthetic bacteria
;
Carbon isotope ratio
;
CO2 fixation
;
Chlorobium thiosulfatophilum
;
Rhodospirillum rubrum
;
Chlamydomonas reinhardii
;
Chromatium
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract 1. The carbon isotope discrimination properties of a representative of each of the three types of photosynthetic bacteria Chlorobium thiosulfatophilum, Rhodospirillum rubrum and Chromatium and of the C3-alga Chlamydomonas reinhardii were determined by measuring the ratio of 13CO2 to 12CO2 incorporated during photoautotrophic growth. 2. Chromatium and R. rubrum had isotope selection properties similar to those of C3-plants, whereas Chlorobium was significantly different. 3. The results suggest that Chromatium and R. rubrum assimilate CO2 mainly via ribulose 1,5-diphosphate carboxylase and the associated reactions of the reductive pentose phosphate cycle, whereas Chlorobium utilizes other mechanisms. Such mechanisms would include the ferredoxin-linked carboxylation enzymes and associated reactions of the reductive carboxylic acid cycle.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00446651
Permalink
