ISSN:
1432-2048
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary The uptake of 3-O-methyl-14C-d-glucose, a non-metabolizable sugar, by autotrophically grown Synechococcus cedrorum was studied at low sugar concentrations in the incubation medium (0.71–11.36 μM), in the light and in the dark. Optimum sugar accumulation against a concentration gradient occurred within dark-treated “starved” cells that were incubated in the light. This phenomenon was greatly inhibited by metabolic inhibitors; it was much less when sugar uptake was observed in the dark. Control cells incubated in the light accumulated 3-O-methyl-14C-d-glucose against a concentration gradient only at lower sugar concentrations (0.71–2.84 μM) and to a lesser extent than the dark-treated cells. Sugar uptake against a concentration gradient by the control cells was completely inhibited in the dark. The results indicate that the morphologically simple unicellular blue-green alga, S. cedrorum, is under certain conditions capable of obtaining a sugar from its medium by an active transport process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00385201
