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The root potential of Laguncularia racemosa, Lr1 (<5 years old), Lr2 (> 40 years old) and Rhizophora mangle (Rm, < 5 years old) to host rhizobacteria in organic substrates with crude oil (CO) are important for the balance of the riverine forest. The results of this research highlight that CO increases SO4 contents in rhizoplane (RP), rhizosphere (RZ) and in soil without roots (S) of the three mangroves, CO induced bacterial decrease. The three compartments accumulate SO4, the highest contents, compared to the control, were in RZ of both Lr populations, 88% in Lr1 plantation and 72% in Lr2. The Azospirillum population increased due to the effect of PC in RZ and S of the three classes of mangrove, similar in RP of Lr2 and Rm. Azospirillum showed a significant positive relationship (r = 0.286**) with SO4 but it was higher in RP of Lr2 and Rm. Azotobacter colonies were higher in RZ of the three mangroves. Desulfovibrio preferred S but showed a negative relationship with increasing SO4. Azospirillum may contribute to the balance of the mangrove forest through N2 fixation, the data suggest that CO is a source of carbon and energy. [ABSTRACT FROM AUTHOR]

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