Effects of two saline-tolerant rhizosphere growth-promoting bacteria on growth and physiology of Medicago sativa under saline-alkali stress
[Objective]In this experiment,the effects of inoculation of halotolerant rhizosphere growth-promoting bacteria,Stenotrophomonas maltophilia JT4 and Serratia plymuthica JG1,on plant growth and physiological charac-teristics of Medicago sativa under saline-alkali stress were studied,so as to provide theoretical basis for the applica-tion of rhizosphere growth-promoting bacteria JT4 and JG1 in saline-alkali resistance of plants.[Method]In indoor pot experiment,alfalfa was used as the test plant,and rhizosphere growth-promoting bacteria JT4 and JG1 with good saline-alkali tolerance and growth-promoting ability were used as the test strains. The effects of inoculation of rhizo-sphere growth-promoting bacteria JT4 and JG1 on the growth and physiological characteristics of alfalfa seedlings were studied under saline-alkali stress and non-saline stress.[Result]Compared with the control,the plant height,root length,fresh weight,ascorbic acid peroxidase activity and catalase activity of alfalfa seedlings inoculated with JT4 and JG1 increased by 31.64％ and 43.50％,32.78％ and 7.05％,100％ and 60％,27.67％ and 200.58％,and 33.33％ and 22.73％ respectively,soluble protein content increased by 126.94％ and 118.88％,and chlorophyll a content increased by 11.12％ and 16.32％,respectively.[Conclusion]Saline-alkali tolerant rhizosphere growth-pro-moting bacteria JT4 and JG1 can better alleviate the damage of alfalfa caused by saline-alkali stress.
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