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The composition of aromatic compounds in the liquid culture medium and the cells of the Rhizobium leguminosarum bv. viciae, Pseudomonas syringae pv. pisi, and Clavibacter michiganensis sps. sepedonicus bacteria grown in the presence of the negative allelopathic compound N-phenyl-2-naphthylamine (N-PNA) found in the root exudates of legume plants is analyzed. It is demonstrated that phthalates are the main products of N-PNA degradation. Bacteria can actively secrete them into the environment and convert phthalates of one type into other types by changing the alkyl groups linked to the o-phthalic acid via the ester bond in their molecules. The analyzed bacteria differed in the rate of N-PNA degradation (10 and 100 µM), which exerted different effects on their growth and viability. The proposed mechanisms could potentially be used to control the bacterial composition and number in the rhizosphere of legume plants with N-PNA and phthalates secreted by plant roots into the exudates, as well as the phthalates produced in the course of N-PNA degradation in the bacterial cells.
Applied Biochemistry and Microbiology – Springer Journals
Published: Mar 30, 2020
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