STUDY OF CD ACCUMULATION BY THLASPI CAERULESCENS UNDER PRESENCE OF GLUCURONIC ACID CONTAINING EXOPOLYSACCHARIDES

摘要

The problem of environmental pollution by heavy metals is actual nowadays. Phytoremediation - use of plants to extract or to stabilize environmental pollutants - is an attractive alternative to phisico-chemical methods due to its low cost and high efficiency .The exudates of bacteria in plant rhizosphere play an important role in plant-microbial interactions. The role of plant exudates on the behavior of heavy metals in soil and mechanism of its accumulation by plants needs more deep understanding. Microbially driven processes are essential also for mineral weathering , where a complex role is played by microbial polysaccharides and proteinaceous structures, which can either inhibit mineral dissolution under some conditions by forming biofilms or promote chemical weathering by producing extracellular polymers of acidic nature and increase metal bio- and phytoavailability and thus affecting the fertility of soils. In this, work influence of exopolysaccharides produced by symbiotic bacteria Rhizobiaceae on Cd in two forms in plant rhizosphere and it's accumulation in shoots and roots of metal hyperaccumulator plant Thlaspi caerulescens was studied.