Effect of salt stress on germination and physiological characteristics of Russian wildryegrass seed.

In order to provide information on seed germination and establishment,the effects of salt stress on germination and physiological characteristics of Russian wildryegrass seed were studied using seven different salt concentrations,0%,0.3%,0.6%,0.9%,1.2%,1.5%,and 1.8%,of NaCl,Na2CO3,and NaHCO3 under incubator.Seed germination percentage,germination energy,root and seedling growth rate,MDA content,and the activities of POD,SOD,and CAT were measured.The results indicate that the germination characteristics and root and seedling growth were significantly affected by salt stress.The MDA content,germination percentage and growth rate were significantly restrained by Na2CO3 stress,while the NaCl stress was minimum.The soluble sugar content and the activities of CAT,POD,and SOD reached maximum with the 0.6% Na2CO3 solution.The soluble sugar and CAT activity reached maximum with 1.5% NaCl solution,while the activities of POD and SOD with 1.2%.The effect of NaHCO3 stress was at midway between Na2CO3 and NaCl.The order of salt stress impact from strong to weak on seed germination of Russian wildryegrass were Na2CO3NaHCO3NaCl.