Physiological responses of halophyte Chenopodium glaucum L. to NaCl and NaHCO3 stresses.

【Objective】It aimed to searching for new Halophytes with both ecological and economic benefits,in order to cope with the expansion of soil salinity.【Method】In present study,Chenopodium glaucum L.,one kind of halophyte in Xinjiang with high economic value,was taken as material,the relative growth rate(RGR),contents of MDA,different types of osmolytes and antioxidant,and the activity of some important antioxidases were measured by using spectrophotometry under the stress of different concentrations of NaCl and NaHCO3.The differences of physiological response between salt(NaCl) and alkali(NaHCO3) stresses were analyzed.【Result】It showed that:(1) NaCl stress under the concentration of 0～300 mmol/L had little inhibition to its growth,but high concentration of NaHCO3 treatment(300 mmol/L) would inhibit its growth to some extent;(2) MDA content increased significantly under 150 mmol/L and 300 mmol/L NaCl and NaHCO3 treatment;the activities of SOD,CAT and POD had no significant changes under stresses,while the ASA level increased significantly under above salt treatment;(3) The contents of Pro,betaine and soluble sugar in leaves increased under the stress of NaCl and NaHCO3,and the content of Pro was much higher under 150 and 300 mmol/L of NaCl treatment than that of the same concentration of NaHCO3.【Conclusion】The results suggested that the differences in accumulation of ASA and Pro under NaCl and NaHCO3 treatments might be one of the reasons causing tolerance variation under higher concentration of salt and alkali stress.