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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Date
2018
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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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Keywords
Canga, Rare plants, Bioremediation, Biofertilization, Biocontrol
Citation
FELESTRINO, E. B. et al. Biotechnological potential of plant growth-promoting bacteria from the roots and rhizospheres of endemic plants in ironstone vegetation in southeastern Brazil. World Journal of Microbiology and Biotechnology, v. 34, n. 156, p. 1-14, out. 2018. Disponível em: <https://link.springer.com/article/10.1007%2Fs11274-018-2538-0>. Acesso em: 22 fev. 2019.