Uptake and translocation of calcium in cucumber.

Uptake and translocation of Ca2+(45Ca) were compared with water translocation in :12-day old intact plants and excised roots of cucumber (Cucumis sativus L. var. Cilla), which had been cultivated in nutrient solution. No immediate reduction of Ca2+ uptake was found when water translocation was reduced by excision of the shoot. in the presence of 2,4-dinitrophenol Ca2+ translocation was reduced in the intact plants while water translocation was unchanged. It is suggested that regulation of Ca2+ uptake is primarily achieved in the root. The DNP-sensitive mechanism of Ca2+ uptake was associated with the root and probably represented transport through the endodermis into the stele. [ABSTRACT FROM AUTHOR]