Effect of 5 Strains of Nitrogen-fixing Bacteria on Maize Growth and Antistress Enzyme in Different Saline-alkali Soil
In order to study the effects of nitrogen-fixing bacteria on maize growth and antistress enzyme in different saline-alkali soils,five nitrogen-fixing bacteria were selected,including Bacillus stratosphericus,Bacillus subtilis,Bacillus cereus,Bacillus aerophilus and Serratia liquefacients,and the effects of nitrogen-fixing bacteria on the growth,root morphology and antistress enzyme activities of maize were studied by pot experiments using the liquid medium without inoculation of nitrogen-fixing bacteria as the control.The results showed that the five nitrogen-fixing bacteria could increase the growth and root morphology indexes of maize,and promote the dry matter accumulation of maize in saline-alkali soil.Compared with the control,the aboveground dry matter of the five nitrogen-fixing bacteria was increased by 22.22％,62.96％,44.44％,40.74％and 37.04％in mild saline-alkali soil,respectively.The aboveground dry matter in severe saline-alkali soil was increased by 29.41％,29.41％,41.18％,23.53％and 11.76％,respectively.The five nitrogen-fixing bacteria increased the activities of antioxidant enzymes such as CAT,SOD and POD in maize in mild and severe saline-alkali soil,and significantly decreased the content of malondialdehyde(MDA).A comprehensive analysis of the membership function method showed that Bacillus subtilis had the best effect on the growth promotion and stress resistance of maize in mild saline-alkali soil,while Bacillus cereus had the best effect on growth promotion and stress resistance of maize in severe saline-alkali soil.The study indicates that the application of nitrogen-fixing bacteria can effectively enhance the adaptability and productivity of maize in saline-alkali soils,holding significant practical value.
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