Table 1 Azotobacter strains used for evaluating their inoculation effect on rice growth. Their plant growth-promoting traits are shown. Acetylene reduction assay was used to determine N2 fixation activity expressed as nmol ethylene/h. Indole-3-acetic acid (IAA) production was expressed as μg/ml
Isolate | Closest species | N2 fixation activity | IAA production | Phosphate solubilization | Siderophore production | Cellulose degradation | Lignin degradation |
|---|---|---|---|---|---|---|---|
CHB 195 | A. chroococcum | 19.3 | 6.01 | − | + | − | − |
CHB 461 | A. beijerinckii | 0.26 | 4.43 | − | − | + | − |
CHB 475 | A. vinelandii | 3.39 | 1.62 | + | + | − | − |
CHB 598 | A. tropicalis | 76.6 | 3.45 | − | + | + | − |
CHB 626 | A. vinelandii | 23.4 | 2.62 | − | + | − | − |
CHB 652 | A. tropicalis | 119 | 2.81 | − | + | + | − |
CHB 838 | A. tropicalis | 14.7 | 4.55 | − | + | − | − |
CHB 846 | A. chroococcum | 61.9 | 2.17 | − | + | + | + |
CHB 851 | A. chroococcum | 136 | 3.01 | − | + | + | + |
CHB 869 | A. chroococcum | 14.2 | 8.94 | − | − | + | − |
CHB 900 | A. beijerinckii | 120 | 1.19 | − | + | − | + |
CHB 939 | A. beijerinckii | 185 | 3.38 | + | − | − | − |