Published in Scientific Papers. Series B, Horticulture, Vol. LXVIII, Issue 1
Written by Gabi Mirela MATEI, Sorin MATEI
The paper aimed to present the results of research carried out on soil microbiota as compared to that colonizing rhizosphere of tomato plants (Solanum lycopersicum L.), FLAVIOLA variety, for assessing the influence of root exudates on composition and abundance of microbial communities in relationship with benefits for plant nutrition and health conferred by their interaction. Cosmopolitan fungal species from genera Fusarium, Penicillium and Humicola, as well as bacteria from genera Bacillus, Pseudomonas, associated with Actinomycetes dominated microbial communities from soil. Rhizosphere communities were dominated by fungal species belonging to genera Aspergillus, Penicillium and Trichoderma accompanied by nematophagous fungi from genus Arthrobotrys. Pseudomonas fluorescens, important for biocontrol of root pathogenic microorganisms, associated with other non-fluorescent species of Pseudomonas were the most abundant in rhizosphere. Rhizosphere effect assessed using as indicator the ratio between the value of total counts of microbes in rhizosphere and in soil (R/S) confirmed the stimulation of microbial abundance and diversity by plant root exudates as compared to soil.
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