Compartmentation and fluxes of sugars in roots of Phaseolus vulgaris under phosphate deficiency
1999
Cierezsko, I. (University of Bialystok (Poland). Inst. of Biology) | Farrar, J.F. | Rychter, A.M.
The influence of phosphate deficiency on the sugar accumulation and sugar partitioning in the root cells of bean (Phaseolus vulgaris) was studied. Phosphate deficit in the growth medium resulted in increased sugar concentration for about 30 % in the apoplastic and cytoplasmic compartments as well as in the vacuoles of root cells. However, the distribution of sugars between apoplast and cytoplasm compartment and vacuole was not affected by decreased phosphate coneentration. About 20 % of sugars were found in the apoplast and cytoplasm, about 80 % in the vacuole. Low phosphate concentration enhanced influx of exogenous 14C-sucrose into meristematic and elongation zones of root. The 14C-labelled sugar content in the root tips increased for about 60 % as compared to control plants. Phosphate deficiency increased C-glucose uptake and content in the root tips.
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