Mean daily rates of net phosphate uptake, as determined colorimetrically from phosphate depletion of the medium, were measured for Chara hispida shoots given 1 mmol m-3phosphate and isolated (split chamber technique) rhizoid-node complexes given 1-, 50-, 100-, 500- and 1000 mmol m-3phosphate. Under aerobic conditions phosphate uptake by the rhizoid-node complex expressed per g FW shoot increased with external phosphate concentration 1-100 mmol m-3. At external phosphate concentrations 100-1000 mmol m-3uptake rates by the rhizoid-node complex were two to three times greater than that for the shoot at 1 mmol m-3phosphate. Anaerobic conditions substantially reduced uptake by the rhizoid-node complex. It is concluded that in aerobic sediments, the rhizoid could play a substantial, possibly major role in phosphate uptake by the whole plant but, in aerobic sediments, this will be the case only when phosphate levels in the open water are extremely low. © 1987 The British Phycological Society.
CITATION STYLE
Andrews, M. (1987). Phosphate uptake by the component parts of cham hispida. British Phycological Journal, 22(1), 49–53. https://doi.org/10.1080/00071618700650061
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