Abstract
This work aims at exploring the co-aggregation of Azospirillum brasilense MTCC-125 with other plant growth promoting rhizobacterial (PGPR) strains. The PGPR strains include Azotobacter chroococcum MTCC-446, Azorhizobium caulinodans ORS-571, Bacillus megatherium MTCC-3353 and Pseudomonas fluorescens MTCC-4828. The influence of different physical and chemical factors involved in this phenomenon was investigated. Co-aggregation was found to be dependent on various factors: pH, temperature, inoculation level and growth phase. Treatment with urea, protease and chelating agents such as EDTA (ethylene diamine, tetra acetic acid) and EGTA (ethyl glycol-bis(β-amino ethyl ether) N-N′-tetra acetic acid) was found to inhibit co-aggregation. Sonication was found to increase co-aggregation, while heat treatment has a detrimental effect. The ability of Azospirillum co-aggregates to endure desiccation, heat, osmotic tolerance and osmotic shock and for its survivability in different carrier materials were also evaluated. Among the different combinations, the co-inoculation of Azospirillum MTCC-125 and Azotobacter MTCC-446 exhibited a higher degree of tolerance as compared to the other combinations tested.
| Original language | English |
|---|---|
| Pages (from-to) | 491-499 |
| Number of pages | 9 |
| Journal | Journal of the Taiwan Institute of Chemical Engineers |
| Volume | 40 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Sept 2009 |
| Externally published | Yes |
Keywords
- Azospirillum brasilense
- Co-aggregation
- Plant growth promoting rhizobacteria (PGPR)
- Survival
- Tolerance
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
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