Affiliation:
1. Biology Department, Memphis State University, Memphis, Tennessee 38152
Abstract
Mannose is not a suitable substrate for N
2
-fixing
Azotobacter vinelandii
. However, when H
2
gas is provided,
A. vinelandii
can grow mixotrophically with H
2
as the energy source and mannose as the carbon source (T.-Y. Wong and R. J. Maier, J. Bacteriol. 163:528-533, 1985). In this report, seven sugars were used to determine whether
A. vinelandii
could derive energy from these sugars for mannose utilization. Supplementation of fructose- or galactose-limited medium with mannose did not influence the biomass produced by N
2
-fixing
A. vinelandii.
The presence of mannose in glucose- or maltose-limited cultures increased cell yield slightly. The addition of mannose decreased the total biomass in the melibiose-limited culture slightly. Mannose was a potent inhibitor of growth when sucrose or turanose was used as the primary sugar. The inhibitory effect of mannose on utilization of sucrose and turanose seems to be related to the energy requirement of the N
2
-fixing processes.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Reference11 articles.
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4. Dissimulation of 6-phosphogluconate by Azotobacter vinelandii;Mortenson L. E.;Biochim. Biophys. Acta,1955
5. Initial stages in the breakdown of carbohydrates by the Azotobacter vinelandii;Mortenson L. E.;Arch. Biochem. Biophys.,1955
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