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Effect of ammonium on anion uptake and trans-root potential in sunflower roots

Published online by Cambridge University Press:  27 March 2009

S. M. Ragab
S. M. Ragab
Affiliation:
Soils Department, Faculty of Agriculture, University of Al Azhar, Cairo, Egypt
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Summary

Studies were made on detopped sunflower plants to see whether the depolarizing effect of NH4 on the trans-root potential is the result of increasing H2PO4 uptake and to determine the effect of NH4 on the flux of NO3 and SO4 in xylem exudate. Increasing the NH4 in the medium increased the H2PO4 flux in the exudate, but decreased NO3 and SO4 fluxes. Ammonium and NO3 influenced the uptake of each other but NH4 had the greater effect. These NH4 effects were attributed wholly or in part to blockage of the root metabolism which may have affected the permeability of root cell membranes. Therefore, the stimulation of H2PO4 flux by NH4 was probably not attributable to any specific effect of NH4 on H2PO4 uptake. Enhanced H2PO4 and decreased uptake of NO3 and SO4 reflects toxic effects of NH4 on the root metabolism.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 94 , Issue 2 , April 1980 , pp. 479 - 482
Copyright
Copyright © Cambridge University Press 1980

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