Optimum Ca(NO3)2 supply develops salt tolerance in NaCl-stressed Cyclocarya paliurus seedlings

Abstract

The effect of varying Ca(NO3)2 supply (0, 6, 12, and 18 mM) on growth, ion uptake, leaf chlorophyll concentration and photosynthesis of NaCl-stressed (85 mM NaCl) Cyclocarya paliurus seedlings was investigated. Addition of Ca(NO3)2 stimulated the shoot growth more than root growth. Ca(NO3)2 supply increased K + and Ca 2+ concentration,whereas the Na + transport to the leaves was inhibited. There was a strong increase in the K + /Na + ratio in the leaves of Ca(NO3)2-treated seedlings. Leaf chlorophyll concentration and photosynthesis rate were low, but both factors were enhanced by 12 mM Ca(NO3)2. Therefore, moderate Ca(NO3)2 supply (12 mM) had optimal effects on growth and metabolism of NaCl-stressed C. paliurus seedlings.

Abscisic Acid Impacts Tomato Carotenoids, Soluble Sugars, and Organic Acids

“…For example, varying Ca treatment concentrations in Arabidopsis did not impact the chlorophyll and carotenoid content in the leaves (Kaddour et al, 2012). In leaves of Cyclocarya paliurus seedlings, decreasing the Ca treatment concentration from 18 to 12 mM increased the chlorophyll concentrations (Yao and Wang, 2012). Like x ABA treatments control (0.0 mg·L -1 ); spray (500 mg·L -1 ); root (50 mg·L -1 ); spray/root (500 mg·L -1 / 50 mg·L -1 ).…”