Grass from contaminated environments as sources of degrader bacteria and plant growth promoters
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Abstract
The search for new strains of bacteria capable of stimulating plant growth or that in bioremediation tasks is essential to the need of developing sustainable agricultural production is used. Plants rhizosphere grown in environments contaminated with organic compounds may be a potential source of compounds bacteria degrade and with characteristics of plant growth promoters. This work aimed to isolate bacteria with characteristics of plant growth promoters from the rhizosphere of plants grown on contaminated soils with petroleum and phenolic compounds. Also the ability to grow using 2,4-dichlorophenoxyacetic acid, 2,4-dichlorophenol and 4-chlorophenol as the sole carbon source was evaluated. Fifty-one bacteria from rhizosphere grasses of Cyperus rotundus, Cynodon dactylon and Scleria sp were isolated. At presence of 2,4-dichlorophenoxyacetic acid it grew 92 %, and in 2,4-dichlorophenol and 4-chlorophenol 45 % grew. The 49 % of the isolates showed two or more characteristics of plant growth promoters of which 16 % also grew in phenolic compounds. These isolates were selected to evaluate degradation of 2,4-dichlorophenol and showed between 15 – 40 % degradation. In conclusion, it is the first reports of rhizobacteria isolated from these weeds with capacity to degrade phenolic compounds. Results suggest the potential of these grasses to isolate bacteria with ability to promote plant grow as well as to degrade chlorophenols and the possibility of their associating to plants for phytoremediation.
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