Table 1.
Key genera of free-living and symbiotic diazotrophs of agricultural significance and examples of associated host plant species.
| Heterotrophic |
Phototrophic |
||
|---|---|---|---|
| Free-living | Symbiotic (host) | Free-living | Symbiotic (host) |
| Aerobic | Azorhizobium | Cyanobacteria | Anabaena (Azolla) |
| Azotobacter | (sesbania) | Gloeocapsa | |
| Azospirillum | Bradyrhizobium | Trichodesmium | |
| Azoarcus | (peanut, soybean, vigna) | Nostoc | |
| Beijerinckia | Mesorhizobium | Anabaena | |
| Rhizobium | (chickpea, milk vetch) | Calothrix | |
| Facultative anaerobic | Rhizobium | Photosynthetic bacteria | |
| Bacillus | (common bean, peas, lentils, vetch, medicago, sesbania) | Rhodospirillum | |
| Klebsiella | Sinorhizobium | Rhodopseudomonas | |
| Enterobacter | (soybean, sesbania) | Chromatium | |
| Erwinia | Chlorobium | ||
| Anaerobic | |||
| Clostridium | |||
| Desulfobirio | |||