INVESTIGATIONS INTO THE PATTERN Of MICROBIAL COLONIZATION OF EARLY RHIZOSPHERE WITH MODEL SYSTEMS

Abstract

The rhizosphere microflora is a result of interaction between seed surface and soil micro flora. As the plant grows older the organisms from the seed slowly ,diminish and the soil organisms dominate. The pattern of rhizosphere colonization was analysed using model system. Pure cultures of different bacteria and moulds (Pseudomonas, Azotobacter, Arthrobactor, Bacillus, Micrococcus, Aspergillus, Mucor.) were added to previously sterilised seeds and soil in different combinations. The relative incidence was traced in the rhizosphere. It was observed that organisms from soil can always establish better than those from seed coats. Also, that bacteria are better competitors than moulds and that among bacteria the Gram negatives were the most efficient colonizers.