Crucial variations in growth and ion homeostasis of Glycine gracilis seedlings under two types of salt stresses
2015
Shi, L(Northeast Normal University School of Life Sciences) | Ma, S(Northeast Normal University School of Life Sciences) | Fang, Y(Northeast Normal University School of Life Sciences) | Xu, J(Northeast Normal University School of Life Sciences)
Based on Glycine gracilis growth and ion homeostasis testing, neutral salt (NS)and alkaline salt (AS) stress were characterized and the responses of G. gracilis were investigated.The injurious effects of AS on G. gracilis were obviously stronger than those of NS.The effects of both stresses on the Na+ content and Na+/K+ ratio were similar at low concentrations, but as the stress increased, the effects of a greater Na+ content and Na+/K+ratio increased slowly under NS conditions, but sharply under AS. The roots of G. gracilis accumulated NO3−and H2PO4−, while the stems and leaves accumulated C2O4(2−) and H2PO4−to maintain thein tracellular ion balance. The dominant intracellular anions in the stipes were NO3- and C2O4(2-) under control conditions, and NO3- and H2PO4- under salt stress. With the increasing AS, the Cl−, NO3− and H2PO4− concentrations decreased, and G.gracilis might have increased SO4(2−) and C2O4(2−)levels to compensate for the shortage of inorganic anions. Under NS, the NO3− and C2O4(2−) concentrations decreased, and G. gracilis might have increased Cl−, H2PO4− and SO4(2−)levels to compensate for the shortage of inorganic anions. G. gracilis seedling showed a special nutritional metabolism and some growth adaptability under salt stress.
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