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World J Microbiol Biotechnol ; 34(10): 156, 2018 Oct 04.
Artigo em Inglês | MEDLINE | ID: mdl-30284648

RESUMO

Microorganisms associated with plants have a great biotechnological potential, but investigations of these microorganisms associated with native plants in peculiar environments has been incipient. The objective of this study was to analyze the plant growth-promoting bacteria potential of cultivable bacteria associated with rare plants from the ferruginous rocky fields of the Brazilian Iron Quadrangle. The roots and rhizospheres of nine endemic plants species and samples of a root found in a lateritiric duricrust (canga) cave were collected, the culturable bacteria isolated and prospected for distinct biotechnological and ecological potentials. Out of the 148 isolates obtained, 8 (5.4%) showed potential to promote plant growth, whereas 4 (2.7%) isolates acted as biocontrol agents against Xanthomonas citri pathotype A (Xac306), reducing the cancrotic lesions by more than 60% when co-inoculated with this phytopathogen in Citrus sinensis plants. Moreover, other 4 (2.7%) isolates were classified as potential bioremediation agents, being able to withstand high concentrations of arsenite (5 mM As3+) and arsenate (800 mM As5+), by removing up to 35% and 15% of this metalloid in solution, respectively. These same four isolates had a positive influence on the growth of both the roots and the aerial parts when inoculated with tomato seeds in the soil contaminated with arsenic. This is the first time that an investigation highlights the potentialities of bacteria associated with rare plants of ferruginous rocky fields as a reservoir of microbiota of biotechnological and ecological interest, highlighting the importance of conservation of this area that is undergoing intense anthropic activity.


Assuntos
Bactérias/metabolismo , Fenômenos Fisiológicos Bacterianos , Biotecnologia , Desenvolvimento Vegetal/fisiologia , Raízes de Plantas/microbiologia , Rizosfera , Amilases/metabolismo , Arseniatos/metabolismo , Arsênio/metabolismo , Arsênio/farmacologia , Arsenitos/metabolismo , Bactérias/classificação , Bactérias/efeitos dos fármacos , Bactérias/genética , Biodegradação Ambiental , Biodiversidade , Agentes de Controle Biológico , Brasil , Resistência a Medicamentos , Fertilizantes , Cianeto de Hidrogênio/metabolismo , Ácidos Indolacéticos/metabolismo , Solanum lycopersicum/crescimento & desenvolvimento , Solanum lycopersicum/microbiologia , Microbiota/fisiologia , Fixação de Nitrogênio , Peptídeo Hidrolases/metabolismo , Fosfatos/metabolismo , Doenças das Plantas/microbiologia , Doenças das Plantas/prevenção & controle , Patologia Vegetal , Raízes de Plantas/química , RNA Ribossômico 16S/genética , Sideróforos/metabolismo , Solo/química , Microbiologia do Solo , Poluentes do Solo/análise , Poluentes do Solo/metabolismo , Xanthomonas/fisiologia
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