Biotechnological potential of plant growth-promoting bacteria from the roots and rhizospheres of endemic plants in ironstone vegetation in southeastern Brazil |
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| Authors: | Érica Barbosa Felestrino Izadora Tabuso Vieira Washington Luiz Caneschi Isabella Ferreira Cordeiro Renata de Almeida Barbosa Assis Camila Gracyelle de Carvalho Lemes Natasha Peixoto Fonseca Angélica Bianchini Sanchez Juan Carlos Caicedo Cepeda Jesus Aparecido Ferro Camila Carrião Machado Garcia Flávio Fonseca do Carmo Luciana Hiromi Yoshino Kamino Leandro Marcio Moreira |
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| Affiliation: | 1.Programa de Pós-gradua??o em Biotecnologia, Núcleo de Pesquisas em Ciências Biológicas,Universidade Federal de Ouro Preto,Ouro Preto,Brazil;2.Departamento de Ciências Biológicas (DECBI), Instituto de Ciências Exatas e Biológicas (ICEB),Universidade Federal de Ouro Preto (UFOP),Ouro Preto,Brazil;3.Departamento de Tecnologia,Universidade Estadual Paulista, UNESP,Jaboticabal,Brazil;4.Instituto Prístino,Belo Horizonte,Brazil |
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| Abstract: | 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. | |
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