Degradation of certain aromatic compounds by rhizobia |
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| Authors: | Yosr A Hussien MS Tewfik YA Hamdi |
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| Institution: | 1. Institute of Soils and Water, Microbiology Section, Orman, Giza, Arab Republic of Egypt;2. Institute of Soils and Water, Microbiology Section, Orman, Giza, Arab Republic of Egypt;3. Institute of Plant Protection, Section of Weed Control, Orman, Giza, Arab Republic of Egypt |
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| Abstract: | The ability of 22 strains of Rhizobium to degrade catechol, protocatechuic acid, p-hydroxybenzoic acid and salicylic acid all at 1 mm concentration was examined. In the presence of 4.8 mm Na-glutamate, all rhizobia tested degraded catechol (99–100%), p-hvdroxybenzoic acid (79–99%), protocatechuic acid (81 97%) and salicylic acid (20–83%).The concentration of Na glutamate in the medium affected the degradation of the phenolic compounds at 1 mm concentration. Increased glutamate favoured degradation of p-hydroxybenzoic and salicylic acids but had little effect on catechol. Degradation of protocatechuic acid was inhibited by increased glutamate concentration.Rhizobium phaseoli 405 grown with 8.0 mM Na-glutamate, directly cleaved catechol and protocatechuic acid. p-Hydroxybenzoic acid was converted to protocatechuic acid before ring cleavage. Salicylic acid was converted to gentisic acid before further oxidation. O2 uptake experiments showed that R. phaseoli 405 grown with p-hydroxybenzoic acid was adapted to this compound and protocatechuic acid. A lag of 30 min was required for catechol and salicylic acid. |
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