Abstract
Fructose is specifically taken up by nitrogen-fixing cultures of Anabaena variabilis in the light and lowers the doubling time from 24 to 8 h. The kinetics for both fructose-dependent growth and fructose uptake are exponential. The apparent Km for fructose uptake in N2-fixing cultures is 160 microM for cells not previously exposed to fructose and 50 microM in cells adapted to fructose. Picomolar amounts of [14C]fructose are scavenged from the medium and accumulate in filaments. Heterocysts of fructose-adapted filaments accumulate 14C from fructose within 20 min. Short-term experiments with fructose-starved cultures provide evidence that nitrogenase activity, protein, and chlorophyll content change within one generation time upon addition of fructose. In long-term experiments, the amount of fructose initially present in the medium determines heterocyst number and packed-cell volume. Photosynthetic oxygen evolution and amounts of chlorophyll decrease with exogenous fructose concentrations greater than 20 mM.
Full text
PDF
Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Allen M. B., Arnon D. I. Studies on Nitrogen-Fixing Blue-Green Algae. I. Growth and Nitrogen Fixation by Anabaena Cylindrica Lemm. Plant Physiol. 1955 Jul;30(4):366–372. doi: 10.1104/pp.30.4.366. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Haury J. F., Wolk C. P. Classes of Anabaena variabilis mutants with oxygen-sensitive nitrogenase activity. J Bacteriol. 1978 Nov;136(2):688–692. doi: 10.1128/jb.136.2.688-692.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kratz W. A., Myers J. Photosynthesis and Respiration of Three Blue-Green Algae. Plant Physiol. 1955 May;30(3):275–280. doi: 10.1104/pp.30.3.275. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lim S. T., Shanmugam K. T. Regulation of hydrogen utilisation in Rhizobium japonicum by cyclic AMP. Biochim Biophys Acta. 1979 May 16;584(3):479–492. doi: 10.1016/0304-4165(79)90121-1. [DOI] [PubMed] [Google Scholar]
- Pearce J., Carr N. G. The incorporation and metabolism of glucose by Anabaena variabilis. J Gen Microbiol. 1968 Dec;54(3):451–462. doi: 10.1099/00221287-54-3-451. [DOI] [PubMed] [Google Scholar]
- Thomas J., Meeks J. C., Wolk C. P., Shaffer P. W., Austin S. M. Formation of glutamine from [13n]ammonia, [13n]dinitrogen, and [14C]glutamate by heterocysts isolated from Anabaena cylindrica. J Bacteriol. 1977 Mar;129(3):1545–1555. doi: 10.1128/jb.129.3.1545-1555.1977. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wolk C. P. Movement of carbon from vegetative cells to heterocysts in Anabaena cylindrica. J Bacteriol. 1968 Dec;96(6):2138–2143. doi: 10.1128/jb.96.6.2138-2143.1968. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wolk C. P., Shaffer P. W. Heterotrophic micro- and macrocultures of a nitrogen-fixing cyanobacterium. Arch Microbiol. 1976 Nov 2;110(23):145–147. doi: 10.1007/BF00690221. [DOI] [PubMed] [Google Scholar]