The study deals with the absorption and translocation of Ca 2+ by án intact plant of pumpkin Cucurbita pepo L. and with the effect of various concentrations of 2,4-dinitrophenol (DNP) on these processes. The absorption of Ca 2+ was reduced by the application of this inhibitor, but not completely stopped. The translocation of Ca 2+ into shoots was affected more expressively: it was almost completely inhibited by higher DNP concentrations. The uptake of Rb + is aubstantially more influeneed than that of Ca 2+ : higher inhibitor concentrations caused its complete cessation.
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Olga Votrubová-Vaňousová (1977) studied this question.
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