Plant growth promoting bacteria associated with langsdorffia hypogaea-rhizosphere-host biological interface : a neglected model of bacterial prospection.
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2017
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Soil is a habitat where plant roots and microorganisms interact. In the region
of the Brazilian Iron Quadrangle (IQ), studies involving the interaction between
microbiota and plants have been neglected. Even more neglected are the studies
involving the holoparasite plant Langsdorffia hypogaea Mart. (Balanophoraceae). The
geomorphological peculiarities of IQ soil, rich in iron ore, as well as the model of
interaction between L. hypogaea, its hosts and the soil provide a unique niche that
acts as selective pressure to the evolution of plant growth-promoting bacteria (PGPB).
The aim of this study was to prospect the bacterial microbiota of holoparasitic plant
L. hypogaea, its plant host and corresponding rhizosphere of IQ soil, and to analyze
the potential of these isolates as PGPB. We obtained samples of 11 individuals of
L. hypogaea containing fragments of host and rhizosphere remnants, resulting in 81
isolates associated with Firmicutes and Proteobacteria phyla. The ability to produce
siderophores, hydrocyanic acid (HCN), indole-3-acetic acid (IAA), nitrogen (N2) fixation,
hydrolytic enzymes secretion and inhibition of enteropathogens, and phytopathogens
were evaluated. Of the total isolates, 62, 86, and 93% produced, respectively,
siderophores, IAA, and were able to fix N2. In addition, 27 and 20% of isolates inhibited
the growth of enteropathogens and phytopathogens, respectively, and 58% were able
to produce at least one hydrolytic activity investigated. The high number of isolates
that produce siderophores and indole-3-acetic acid suggests that this microbiota may
be important for adaptation of plants to IQ. The results demonstrate for the first time
the biological importance of Brazilian IQ species as reservoirs of specific microbiotas
that might be used as PGPB on agricultural land or antropized soils that needs to be
reforested.
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Bioprospecting, Biotechnological potential
Citação
FELESTRINO, E. B. et al. Plant growth promoting bacteria associated with langsdorffia hypogaea-rhizosphere-host biological interface: a neglected model of bacterial prospection. Frontiers in Microbiology, v. 08, p. 2017.00172, 2017. Disponível em: <http://journal.frontiersin.org/article/10.3389/fmicb.2017.00172/full>. Acesso em: 15 set. 2017.