Solubilização de fostatos por microrganismos na presença de fontes de carbono

Filho, Germano Nunes Silva; Vidor, Caio

doi:10.1590/s0100-06832000000200008

Cited by 57 publications

(21 citation statements)

References 21 publications

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“…As raízes das 151 plantas das 19 espécies vegetais foram efetivamente testadas em meio de cultura específicos para solubilizadores de P-Ca e P-Al. Vários estudos (Ilmer et al, 1995;Kim et al, 1999;Silva Filho e Vidor, 2000;Silva Filho et al, 2002;Hara e Oliveira, 2004, 2005 evidenciam que a capacidade dos isolados de bactérias do solo solubilizarem o P-Ca está correlacionada com a diminuição do pH do meio pelos ácidos orgânicos. Os ácidos orgânicos secretados podem diretamente dissolver o fosfato mineral como resultado da troca de anion de PO 4 -2 por anion ácido ou pode quelatar íons de Fe 2+/3+ e Al 3+ associados com fosfatos.…”

Section: Resultsunclassified

Ocorrência de bactérias solubilizadoras de fosfato nas raízes de plantas de importância econômica em Manaus e Rio Preto da Eva, Amazonas

Silva

Chagas²,

Oliveira³

et al. 2011

J. Biotechnol. Biodivers.

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Visando o conhecimento da ecologia de bactérias solubilizadoras de fosfato (BSF), o trabalho teve como objetivo avaliar a ocorrência de BSF nas raízes de plantas em propriedades nos municípios de Manaus e Rio Preto da Eva, Amazonas. As raízes foram cortadas em pedaços de 1cm e colocadas em placas de petri com dois tipos de meio de cultura, um contendo fosfato de alumínio e pH 4,5 (P–Al) e, o outro, fosfato de cálcio, pH 6,5 (P–Ca). Em seguida foi observada a presença das BSFs em cada meio. Os resultados mostram que a presença de BSF varia com o local e as espécies vegetais estudadas. A ocorrência de bactérias solubilizadoras de fosfato de cálcio foi maior do que as que solubilizaram fosfato de alumínio.

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Section: Resultsunclassified

Ocorrência de bactérias solubilizadoras de fosfato nas raízes de plantas de importância econômica em Manaus e Rio Preto da Eva, Amazonas

Silva

Chagas²,

Oliveira³

et al. 2011

J. Biotechnol. Biodivers.

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“…The development of a transparent halo zone around the colony revealed the phosphate-solubilizing ability of the isolate. To estimate the phosphate-solubilizing ability quantitatively, the Solubilization Index (SI) was calculated as follows: SI = A/B, where A is the colony diameter + halo zone diameter, and B is the colony diameter ( Edi-Premono, 1996 ).The isolates were grouped according to Silva Filho and Vidor (2000) , in bacteria with low (SI < 2), intermediate (2 < SI < 3), and high (SI > 3) solubilization potential. The experiments were conducted in triplicate.…”

Section: Methodsmentioning

confidence: 99%

Multiple Plant Growth-Promotion Traits in Endophytic Bacteria Retrieved in the Vegetative Stage From Passionflower

et al. 2021

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Bacteria exhibiting beneficial traits like increasing the bioavailability of essential nutrients and modulating hormone levels in plants are known as plant growth promoting (PGP) bacteria. The occurrence of this specific group of bacteria in the endophytic environment may reflect the decisive role they play in a particular condition. This study aimed to determine the taxonomical diversity of the culturable bacterial endophytes, isolated in the vegetative stage of passionflower (Passiflora incarnata), and assess its potential to promote plant growth by phenotypic and genotypic approaches. The sequencing and phylogenetic analysis of the 16S rRNA gene allowed us to classify 58 bacterial endophytes into nine genera. Bacillus (70.7%) was the most dominant genus, followed by Pseudomonas (8.6%) and Pantoea (6.9%). A few isolates belonged to Rhodococcus and Paenibacillus, whereas the genera Lysinibacillus, Microvirga, Xanthomonas, and Leclercia were represented by only one isolate. The strains were tested for nitrogen fixation, phosphate solubilization, indole-acetic-acid synthesis, and siderophore production. Moreover, PGP related genes (nifH, ipdC, asb, and AcPho) were detected by PCR-based screening. Most of the isolates (94.8%) displayed a potential for at least one of the PGP traits tested by biochemical assays or PCR-based screening. Nine strains were selected based on results from both approaches and were evaluated for boosting the Cape gooseberry (Physalis peruviana) germination and growth. All tested isolates improved germination in vitro, and the majority (78%) increased growth parameters in vivo. The results suggested that most of culturable bacteria inhabiting P. incarnata in the vegetative stage could be used as probiotics for agricultural systems. Besides, their occurrence may be associated with specific physiological needs typical of this development stage.

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“…For our isolates, as well as the type or reference strains tested, no halo of solubilization was observed on the utilized media. Phosphate solubilization tests (Ca, Al and Fe) have been widely used for the selection of plant growthpromoting bacteria Oliveira 2004, 2005;Marra et al 2011Marra et al , 2012Nautiyal, 1999;Oliveira-Longatti et al 2014;Silva Filho and Vidor 2000;Silva Filho et al 2002;Silva et al 2011b;Silva et al 2012). However, solubilization tests in solid Table 4.…”

Section: Production Of Indole Compoundsmentioning

confidence: 99%

Characterization of bacterial endophytes from the roots of native and cultivated Brazil nut trees (Bertholletia excelsa)

et al. 2019

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Brazil nut is a very important nontimber forest product in the Amazon region. Propagation of this tree still represents a challenge due to slow and uneven seed germination. In this context, plant growth-promoting bacteria can facilitate the process of propagation. The aims of this study were to isolate and characterize endophytic bacteria from the roots of Brazil nut trees in native terra firme forest and cultivation areas in northern Brazil, and to identify mechanisms by which bacteria act in plant growth promotion. Overall, 90 bacterial isolates were obtained from the roots of Brazil nut trees in monoculture, agroforestry and native forest areas by using different semisolid media. The isolates were characterized by sequencing the 16S rRNA gene. Plant growth-promoting characteristics were evaluated by the presence of the nifH gene, aluminum phosphate solubilization and the production of indole compounds. The isolates were affiliated with 18 genera belonging to 5 different classes (α-Proteobacteria, β-Proteobacteria, γ-Proteobacteria, Bacilli and Actinobacteria). The genus Bacillus was predominant in the forest and monoculture areas. Fourteen isolates presented the nifH gene. Most of the bacteria were able to solubilize aluminum phosphate and synthetize indole compounds. The results indicated high diversity of endophytic bacteria present among the roots of Brazil nut trees, mainly in the agroforestry area, which could be related to soil attributes. Among the 90 isolates, the 22 that presented the best results regarding plant growth promotion traits were good candidates for testing in seedling production of Brazil nut trees.

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Solubilização de fostatos por microrganismos na presença de fontes de carbono

Cited by 57 publications

References 21 publications

Ocorrência de bactérias solubilizadoras de fosfato nas raízes de plantas de importância econômica em Manaus e Rio Preto da Eva, Amazonas

Ocorrência de bactérias solubilizadoras de fosfato nas raízes de plantas de importância econômica em Manaus e Rio Preto da Eva, Amazonas

Multiple Plant Growth-Promotion Traits in Endophytic Bacteria Retrieved in the Vegetative Stage From Passionflower

Characterization of bacterial endophytes from the roots of native and cultivated Brazil nut trees (Bertholletia excelsa)

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