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P19: Natural Bacterial Defence Mechanisms in Plant Rhizosphere: Root-Adhering Soil (BDM:RAS), E. Emnova

Title:

Dr.

First Name:

Ecaterina

Family Name:

Emnova

Position:

Principal Research Scientist

Name of organization:

Institute of Plant Physiology, Moldovan Academy of Sciences, Plant Mineral Nutrition, Microbial Ecology of Rhizosphere

Address:

Padurii 22

Postcode:

MD-2002

City:

Chisinau

Country:

Moldova

Telephone:

373-2-567-959

Fax:

E-mail:

Emnova@moldovacc.md

Website:

Proposed Title:

Natural Bacterial Defence Mechanisms in Plant Rhizosphere: Root-Adhering Soil (BDM:RAS)

Abstract

Contamination of the soil by chemical substances to levels, which may disturb soil microbial processes, lead to soil degradation, excessive uptake chemicals in plants and subsequent transfer in a food-chain. The natural microbial defence mechanism, such as exopolysaccharide (EPS) synthesis by rhizosphere microbial community, may potentially prevent the mobility of toxic substances and bioavailability as a result of their binding and sedimentation. It is suggested that quality (composition, physical and chemical properties) of bacterial EPS varies at unfavorable condition (pH, temperature, oxygen, heavy metal or another chemicals concentration). Genetic control of defence mechanisms is presumed. The frequency of horizontal gene transfer in rhizobacteria should be increased under selective pressure, contributing to spreading of beneficial adaptive traits, for example, owing to increased transfer of levansucrase or heavy metal resistance genes. Most information on genetic interactions among bacteria is available on conjugation and only few studies have been concerned with transformation in the environment. The purpose of the presented project is to generate empirical data to test this combined working hypothesis using laboratory model experiments on example of chernozem soil contaminated with copper and planted with soybean plants. Research program of this project will contain two main tasks: first - the investigation of exopolysaccharide synthesis by rhizosphere bacterial community depending on copper concentrations in soil and its influence on bioavailability of copper for crops. Second – elucidation of the role of lateral gene transfer for rhizobacterial exopolysaccharide synthesis capability. The methodology chosen to reach the objectives on first stage will be based on approved techniques, which may be modified and improved if necessary according to concrete subtasks. In collaboration among teams we will concentrating our efforts on the root-adhering soil (RAS) and plant-associated microorganisms in order to reveal relationship between soil copper concentration, quantity and quality of microbial exopolysaccharides in RAS, frequency of horizontal gene transfer in rhizobacteria and accumulation of copper in plant tissue. Results obtained may be useful for plant-microbe based remediation system, for rhizosphere management in plant-based ecological engineering, for new biotechnologies in sustainable agriculture.

A. Enterprises Corner

Enterprises looking for complementary partners in research arena and

Researchers offer their findings for technology transfer to enterprises

B. Research Corner

x

Research institutions looking for partners for joint research venture

x

Potentially interested for continuation of projects preparations on Tuesday afternoon 1 st July

Keywords:

rhizosphere, bacterial exopolysaccharides, horizontal gene transfer  

Received: 10/06/2003

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