Uptake of calcium in wheat triticum aestivum cultivar svenno and cucumber cucumis sativus cultivar cilla

Bengtsson, B.; Jensen, P.

Physiologia Plantarum 55(3): 273-278


ISSN/ISBN: 0031-9317
Accession: 006870401

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Uptake of CA2+(45Ca) was investigated in plants of wheat (T. aestivum L. cv. Svenno) and cucumber (C. sativus L. cv. Cilla) cultivated in a nutrient solution with various Ca2+ concentrations. The absorption of CA2+ was higher in cucumber roots than in wheat roots especially at lower Ca2+ levels in the external medium. The intracellular fraction of Ca2+ was < 20% of the total Ca2+ in wheat roots and < 10% of the total Ca2+ in cucumber roots. The uptake of Ca2+ in cucumber was .apprx. 40 times higher than in wheat. Transport of Ca2+ in the roots towards the endodermis is suggested to take place mainly in the apoplastic pathway regulated by the availability of negatively charged binding sites along the cell wall continuum. Further transport of Ca2+ towards the stele may involve diffusion of Ca2+ into the symplasm in the vicinity of the endodermis. An active extrusion of Ca2+ towards the stele or towards the external medium may play a role in the regulation of Ca2+ uptake.