MEINDL, D and LOOS, E (1990) RELEASE OF GLUCOSE BY NOSTOC-SPEC ISOLATED FROM THE LICHEN PELTIGERA-HORIZONTALIS. PLANT SCIENCE, 72 (2). pp. 283-288. ISSN 0168-9452,
Full text not available from this repository.Abstract
Cultured Nostoc spec. from Peltigera horizontalis excerted in the light between 1% and 3.4% of fixed (CO2)-C-14 into the medium, less-than-or-equal-to-0.8% as glucose. A several-fold increase in the rate of release was caused by addition of carbonyl cyanide p-trifluorome-thoxyphenylhydrazone (FCCP) in the dark, the major component released being glucose. The amount of glucose excreted in the presence of FCCP exceeded the pool of intracellular glucose + glucose 6-phosphate by far, suggesting a glucan as a precursor. A glucan - identified enzymatically with amyloglucosidase - was the main assimilation product which was degraded during excretion of glucose in the dark in the presence of FCCP. Of the free-living cyanobacteria, Nostoc punctiforme also showed glucose release whereas Nostoc muscorum did not. It is concluded that (i) the symbiotic Nostoc spec. can excrete glucose in the absence of the fungal partner, (ii) this release is a passive process being fed by a glucan and (iii) glucose release is not a specific function of symbiotic cyanobacteria.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHYSIOLOGY; ALGAE; CYANOBACTERIA (NOSTOC); GLUCOSE TRANSPORT; LICHEN (PELTIGERA); SYMBIOSIS |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/55610 |
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