Abstract
Eight hydrogen-oxidizing bacteria isolated from Medicago sativa rhizosphere were test on wheat growth promoting effect. Superficial characteristics of germinal wheat were test by small scale cultivated experiments. ACC deaminase and siderophore were test to find the plant growth promoting mechanisms of hydrogen-oxidizing bacteria. Results show that WMQ-7, FMG-3 and FMG-5 have strong ability to promote the growth of wheat. The length of roots and sprouts respectively increased over 50% and 30% than blank control. Dry biomass of wheat effect by the strains was respectively increased 95.24%, 57.14% and 47.62%. Quantity of grain increased over 100%. Strain WMQ-7 can produce both of ACC deaminase and siderophore. ACC deaminase activity is 0.671 U/μg. Siderophore concentration is 7.1996 μg/mL and absorption peak is at 404 nm and the absorbance was 0.834. So we speculate that ACC deaminase activity and siderophore would be the plant growth promoting mechanisms of strain WMQ-7.
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