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Journal of soil science and plant nutrition

versión On-line ISSN 0718-9516

Resumen

SHI, L; MA, S; FANG, Y  y  XU, J. Crucial variations in growth and ion homeostasis of Glycine gracilis seedlings under two types of salt stresses. J. Soil Sci. Plant Nutr. [online]. 2015, vol.15, n.4, pp.1007-1023.  Epub 18-Oct-2015. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162015005000070.

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 NO3and H2PO4, while the stems and leaves accumulated C2O42− and H2PO4to maintain thein tracellular ion balance. The dominant intracellular anions in the stipes were NO3- and C2O42- 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 SO42− and C2O42−levels to compensate for the shortage of inorganic anions. Under NS, the NO3 and C2O42− concentrations decreased, and G. gracilis might have increased Cl, H2PO4 and SO42−levels to compensate for the shortage of inorganic anions. G. gracilis seedling showed a special nutritional metabolism and some growth adaptability under salt stress.

Palabras clave : growth; ion homeostasis; saline stress; pH stress.

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