Bioremediation of Pentachlorophenol (PCP)-Polluted Soil by Plant Growth promoting Rhizobacteria (PGPR)
Pentachlorophenol (PCP) is used as an insecticide and a leather and wood preservative as well. It is present in tannery effluents and also formed unintentionally in effluents of paper and pulp industries. Microbes and plants are among the most important biological agents that remove and degrade waste materials to enable their recycling in the environment. Rhizosphere interactions between plants and microbial communities benefit both. The bacteria receive nutrients from root exudates and the plants enhance nutrient uptake and reduction in the toxicity of soil contaminants. In the present investigation, a number of plant species were evaluated for their ability to tolerate different concentrations of pentachlorophenol (PCP) in the soil. The toxic effect of PCP on plants was studied by monitoring seed germination, plant growth and biomass. Although PCP had a negative effect on all the plant species tested, maize and groundnut showed the maximum tolerance to PCP. Other tolerating crops included wheat, safflower, sunflower, and soybean. From the rhizosphere soil of the tolerant seedlings, as many as 27 PCP tolerant rhizobacteria and 19 endophytic bacteria were isolated and assessed for PCP degradation efficiencies. The efficient PCP degrading isolates were evaluated in vitro for plant growth promoting activities such as P-solubilisation, IAA production, HCN production and Antibiosis. Most of the isolates solubilized TCP. Many rhizobacteria and endophytes showed good results for IAA production, HCN production and Antifungal activity against Rhizoctonia solani, indicating the overall suitability of PCP degrading bacteria in sustainable agriculture.
PCP bioremediation PGPR plant growth promotion
K.S. Jagadeesh Avita K. Marihal Sarita Sinha
Dept. of Agricultural Microbiology, University of Agricultural Sciences, Dharwad 580 005,Karnataka I Ecotoxicology and Bioremediation Group, National Botanical Research Institute, Lucknow 226 001, Indi
国际会议
The 2nd Asian PGPR Conference(第二届亚洲植物促生根际细菌会议)
北京
英文
222-229
2011-08-21（万方平台首次上网日期，不代表论文的发表时间）