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[Screening, resistance and growth-promoting effect of endophytic bacteria with ACC deaminase activity isolated from soybean nodules]. | LitMetric
Objective : We screened endophytic bacteria containing ACC (1-aminocyclopropane-1-carboxylate) deaminase from soybean nodules, and evaluated salt-alkaline resistance, phylogenetic status and the growthpromoting of representative strain.Methods : The features of strains producing ACC deaminase were determined by using the ACC as a sole nitrogen source, adopting standard curve method, colorimetric method, solid medium screening method, bacterial morphology, physio-biochemical characteristics, similarity analysis of 16S rRNA gene, inoculation tests.Results : Eight endophytic bacteria containing ACC deaminase were screened from soybean nodules collected from 36 points of 13 cities (regions)in Henan province. Enzymaticactivity of DD132 was the highest (15.712 U/mg). Screened strain tolerated to medium of 4%-6% NaCl concentration. Among of them, DD165 and DD132 could tolerate 9% NaCl concentration. Five bacteria growing well under pH 11, showing that these strains had stronger alkali resistance. Eight strains containing ACC deaminase activity were affiliated to four genera: Bacillus, Enterobacter, Stenotrophomonas and Pantoea. Inoculation test showed that DD132 had a significant growthpromoting effect on wheat seedlings.Conclusions : Endophytic bacteria containing high ACC deaminase activity from soybean nodules have stronger salt-alkaline resistance. DD132 has obvious growth-promoting effect on wheat seedlings.
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