Amino acids iii. Distribution of microorganisms in rhizosphere. Distribution of microorganisms is non-homogeneous and bacteria are aggregated in colonies. So space does not appear to be limiting. Root cap usually devoid of microorganisms.
Gel contains high numbers.
Numbers may be high at root junctions. Colonization of sloughed roots cells is heavy, whereas there may be little colonization of adjacent healthy roots. Many rhizosphere organisms have high quantities of PHB and other storage materials. Sample Total viable bacteria Pseudomonas sp. Rhizobia frequently have difficult time getting established in newly cleared soil.