The phosphate
solubilizing power and
Auxin (Iaa) Production of eight
associative nitrogen-fixing bacteria (ANB) isolated from the oat rhizosphere in Tianzhu, Gansu province, northwest China, an
alpine region, were determined. Three strains showed
phosphate-solubilizing power, namely,
Azotobacter sp. ChO4, Azotobacter sp. ChO5 and Azospirillus
lipoferum ChO6, but the difference in ability was large (83.8-103.5 (μg/mL).) The phosphate-solubilizing power of Azospirillus lipoferum ChO6 was greater than the other two strains. All the strains showed ability to produce auxin (IAA) although the difference in ability was large (IAA concentration was 2.16-17.31 μg/mL). Only two strains, Pseudomonas sp. ChO3 and Azospirillus lipoferum ChO6, excreted high IAA concentrations (greater than 10 μg/mL). From the view of phosphate-solubilizing power and IAA production, it is considered that strains including Pseudomonas sp. ChO3, Azotobacter sp. ChO4, Azotobacter sp. ChO5, Azospirillus lipoferum ChO6 and Azospirillus brasilense ChO8 have relatively larger potential as inoculants in oat biofertilizer.
More summaries about the Associative nitrogen-fixing bacteria in the rhizosphere of Avena sativa in an alpine region Ⅱ Phosph