Background and Aims: To combat the extensive use of chemical pesticides and other agrichemicals on plant growth which may be hazardous to soil and in turn human health, a group of rhizobacteria- the Plant Growth-Promoting Bacteria- can be employed. This study focuses on the mechanisms exhibited by these rhizobacteria that can further help to promote plant growth. Methods: Antifungal activities of different Pseudomonas isolated from sunflower (Helianthus annuus L.) rhizosphere were tested against four phytopathogenic fungi. Study of other biocontroling factors like production of Hydrocyanic acid (HCN) and Ammonia were also taken into consideration. The other study was pertaining to the production of several lytic and detoxification enzymes that these bacteria possess. Tolerance of these isolates to heavy metal stress was also found out, as heavy metal pollution is one of the major problems of environmental concern. Important Findings: Results indicated that 30% of isolates inhibited the growth of Fusarium, Aspergillus and Helminthosporium, 50% were antagonistic against Curvularia. Among the other biocontrolling factors studied, two isolates showed presence of HCN and Ammonia. Study of hydrolytic enzyme showed that protease production was observed in five isolates, one produced amylase. Three isolates produced lipase and cellulase enzymes. Two of the isolates tolerated about 120 mM concentration of Chromium and three isolates grew in presence of 9.9 mM concentration of Zinc.