Effects of Ca2+ on the salt-stress response of barley roots as observed by in-vivo 31 P-nuclear magnetic resonance and in-vitro analysis
1993
Martinez, V. | Lauchli, A.
Calcium has been demonstrated to ameliorate the inhibitory effects of high salinity on nutrient transport in plants. Time-course experiments were carried out to study the effect of high Ca(+2) (6 mM) supply under saline conditions (100 mM NaCl) on the regulation of intracellular pH in excised barley Hordeum vulgare L. cv Arivat) roots. In-vivo (31)P-nuclear magnetic resonance measurements showed an alkalinization of the vacuolar pH after salt treatment. In the presence of high Ca(+2), the extent of salt-induced vacuolar alkalinization was lower. High Ca(+2) partially mitigated the salt-induced increase in Na+ content and decrease in K+ content of the root. The pattern of change in the vacuolar pH paralleled that of Na+ accumulation in the root. This correlation is consistent with the involvement of a tonoplast Na+/H+ antiporter in Na+ transport and the role of Ca(+2) in Na+ uptake. High salt appeared to decrease the Pi content of the vacuole while high Ca(+2) increased this content irrespective of the salt treatment.
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