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Absorption of sodium calcium and potassium during ionic interactions in the course of the germination phase of raphanus sativus



Absorption of sodium calcium and potassium during ionic interactions in the course of the germination phase of raphanus sativus



Canadian Journal of Botany 60(9): 1639-1646



Na+-K+ and Na+-Ca2+ interactions are measured by mineral analysis of germinating plantlets of radish (R. sativus L.) in nutritive solutions enriched in these 3 elements. With high concentrations of CaCl2, more than 2.5 mM, the absorption of Na is stimulated especially when there is a high percentage of this element in the external solution. On the other hand, KCl brings about a decrease in the Na content in the hypocotyl, cotyledons and root; no one organ is affected. Only the uptake of Na is modified, not its transport, which is always proportional to the quantity absorbed. The absorption of Ca and K does not evolve in proportion to their external amounts, and the inhibition of accumulation of these elements by Na is not dependent on the concentration of NaCl. The uptake of Ca is more inhibited than that of K which varies with the quantities of KCl and NaCl in the germination medium. Thus, K inhibits the uptake of Na more than Na inhibits that of K. However, whereas the absorption of Na is only slightly modified by Ca, the absorption of Ca depends highly on the concentration of Na.

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Accession: 004649944

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Absorption of sodium, calcium and potassium and their ionic interactions during the germination phase of Raphanus sativus. Canadian journal of botany = Journal canadien de botanique 60(9): 1639-1646, 1982

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