Effect of NaCl Stress on Injury and Na+, K+ and Ca2+ Distribution in Three Color-leaved Tree Species

Experiments were carried out on NaCl stress with 0, 85, 170, 340, 510 mmol?L-1on 3-year color-leaved tree species namely Acer negundo ‘Aurea’, Albizia spp., Gleditsia triacanthos ‘Sunburst’ in 2016. Content of Na+, K+,Ca2+, value of K+/Na+, Ca2+/Na+of root, stem and leaf and injuries of treated seedlings were measured 50 days later. The results demonstrated that A. negundo ‘Aurea’ showed injury of class 3, A. spp. and G. triacanthos ‘Sunburst’ class 2 under treatment of 340 mmol?L-1 NaCl, while under treatment of 510 mmol?L-1 NaCl, A. negundo ‘Aurea’ and A. spp. class 4, G. triacanthos ‘Sunburst’ class 3. The content of Na+ in the tested organs of three species increased with NaCl concentration, but the content of K+ and value of K+/Na+ decreased significantly. The content of Ca2+ had negative relation with the increase of NaCl concentration, and Ca2+/Na+ of G. triacanthos ‘Sunburst’ in root and leaf showed less decline. The experiment resulted that salt damage of G. tricanthos ‘Sunburst’ was the lowest under NaCl stress.