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Andy AK, Masih SA, Gour VS. Isolation, screening and characterization of plant growth promoting rhizobacteria from rhizospheric soils of selected pulses. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101685] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Tola YH, Fujitani Y, Tani A. Bacteria with natural chemotaxis towards methanol revealed by chemotaxis fishing technique. Biosci Biotechnol Biochem 2019; 83:2163-2171. [PMID: 31272289 DOI: 10.1080/09168451.2019.1637715] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Motile bacteria often exhibit chemotaxis toward favorable compounds. However, the diversity of bacteria that are attracted to a given substance is largely unknown. This study aimed to reveal the diversity of bacteria with natural chemotaxis towards methanol. We tried to enrich environmental chemotactic bacteria using a glass capillary that is half-filled with methanol solidified with agarose as a trap ("chemotaxis fishing"). The pilot experiment using methanol-chemotactic Methylobacterium aquaticum strain 22A enriched the cells by 46-fold. The method was then applied to bacterial suspensions from paddy water and plants. Depending on the isolation sources and the methods of motility induction, methylotrophic bacteria were enriched 1.2-330-fold. The fished isolates belong to 32 species in 18 genera, mainly containing Acinetobacter, Methylobacterium and Pseudomonas species. Our chemotaxis fishing unveiled a part of diversity of the bacteria with natural chemotaxis towards methanol.
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Affiliation(s)
- Yosef Hamba Tola
- Institute of Plant Science and Resources, Okayama University , Kurashiki , Okayama Japan.,Africa-ai-Japan Project at Jomo Kenyatta University of Agriculture and Technology , Nairobi , Kenya.,International Centre of Insect Physiology and Ecology , Nairobi , Kenya
| | - Yoshiko Fujitani
- Institute of Plant Science and Resources, Okayama University , Kurashiki , Okayama Japan
| | - Akio Tani
- Institute of Plant Science and Resources, Okayama University , Kurashiki , Okayama Japan
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Bahena MHR, Salazar S, Velázquez E, Laguerre G, Peix A. Characterization of phosphate solubilizing rhizobacteria associated with pea (Pisum sativum L.) isolated from two agricultural soils. Symbiosis 2016. [DOI: 10.1007/s13199-015-0375-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Farhat MB, Boukhris I, Chouayekh H. Mineral phosphate solubilization by Streptomyces sp. CTM396 involves the excretion of gluconic acid and is stimulated by humic acids. FEMS Microbiol Lett 2015; 362:fnv008. [PMID: 25743071 DOI: 10.1093/femsle/fnv008] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The actinomycetes isolates (128) which were taken from agricultural soil samples and collected near a rock phosphate processing unit were screened for mineral phosphate-solubilizing (MPS) ability. A significant MPS activity was observed for 30 isolates on various phosphate sources when grown in the National Botanical Research Institute's phosphate broth. CTM396 and CTM397 strains which showed the highest MPS abilities were identified by 16S rDNA sequencing as members of the genus Streptomyces. Their MPS activity was proved to be concomitant with a drop in pH due to the secretion of gluconic acid (GA). This was correlated with the simultaneous detection by PCR of genes gdh [encoding the glucose dehydrogenase (GDH) responsible for GA production from glucose] and pqq (involved in biosynthesis of the pyrroloquinoline quinone cofactor of GDH), as well as the highlighting of GHD enzyme activity, for the first time in a Streptomyces sp. strain producing GA. Furthermore, the 0.05% of humic acids proved to have a stimulatory effect on the growth and the ability of CTM396 to solubilize Gafsa rock phosphate. According to this study, it is possible to use humic acids and Gafsa rock phosphate in association with spores of ad hoc Streptomyces strains as natural and efficient amendments to improve plant growth with no need of costly and pollutant transformation of Gafsa rock phosphate.
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Affiliation(s)
- Mounira Ben Farhat
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, BP '1177' 3018 Sfax, Tunisie
| | - Ines Boukhris
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, BP '1177' 3018 Sfax, Tunisie
| | - Hichem Chouayekh
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, BP '1177' 3018 Sfax, Tunisie
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Insertions or deletions (Indels) in the rrn 16S-23S rRNA gene internal transcribed spacer region (ITS) compromise the typing and identification of strains within the Acinetobacter calcoaceticus-baumannii (Acb) complex and closely related members. PLoS One 2014; 9:e105390. [PMID: 25141005 PMCID: PMC4139376 DOI: 10.1371/journal.pone.0105390] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Accepted: 07/17/2014] [Indexed: 11/19/2022] Open
Abstract
To determine whether ITS sequences in the rrn operon are suitable for identifying individual Acinetobacter Acb complex members, we analysed length and sequence differences between multiple ITS copies within the genomes of individual strains. Length differences in ITS reported previously between A. nosocomialis BCRC15417T (615 bp) and other strains (607 bp) can be explained by presence of an insertion (indel 13i/1) in the longer ITS variant. The same Indel 13i/1 was also found in ITS sequences of ten strains of A. calcoaceticus, all 639 bp long, and the 628 bp ITS of Acinetobacter strain BENAB127. Four additional indels (13i/2–13i/5) were detected in Acinetobacter strain c/t13TU 10090 ITS length variants (608, 609, 620, 621 and 630 bp). These ITS variants appear to have resulted from horizontal gene transfer involving other Acinetobacter species or in some cases unrelated bacteria. Although some ITS copies in strain c/t13TU 10090 are of the same length (620 bp) as those in Acinetobacter strains b/n1&3, A. pittii (10 strains), A. calcoaceticus and A. oleivorans (not currently acknowledged as an Acb member), their individual ITS sequences differ. Thus ITS length by itself can not by itself be used to identify Acb complex strains. A shared indel in ITS copies in two separate Acinetobacter species compromises the specificity of ITS targeted probes, as shown with the Aun-3 probe designed to target the ITS in A. pitti. The presence of indel 13i/5 in the ITS of Acinetobacter strain c/t13TU means it too responded positively to this probe. Thus, neither ITS sequencing nor the currently available ITS targeted probes can distinguish reliably between Acb member species.
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Romero FM, Marina M, Pieckenstain FL. The communities of tomato (Solanum lycopersicumL.) leaf endophytic bacteria, analyzed by 16S-ribosomal RNA gene pyrosequencing. FEMS Microbiol Lett 2014; 351:187-94. [DOI: 10.1111/1574-6968.12377] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 01/05/2014] [Accepted: 01/05/2014] [Indexed: 11/28/2022] Open
Affiliation(s)
- Fernando M. Romero
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico Chascomús; Universidad Nacional de General San Martín-Consejo Nacional de Investigaciones Científicas y Técnicas (IIB-INTECH/UNSAM-CONICET); Chascomús Argentina
| | - María Marina
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico Chascomús; Universidad Nacional de General San Martín-Consejo Nacional de Investigaciones Científicas y Técnicas (IIB-INTECH/UNSAM-CONICET); Chascomús Argentina
| | - Fernando L. Pieckenstain
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico Chascomús; Universidad Nacional de General San Martín-Consejo Nacional de Investigaciones Científicas y Técnicas (IIB-INTECH/UNSAM-CONICET); Chascomús Argentina
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Ben Farhat M, Fourati A, Chouayekh H. Coexpression of the pyrroloquinoline quinone and glucose dehydrogenase genes from Serratia marcescens CTM 50650 conferred high mineral phosphate-solubilizing ability to Escherichia coli. Appl Biochem Biotechnol 2013; 170:1738-50. [PMID: 23737304 DOI: 10.1007/s12010-013-0305-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 05/14/2013] [Indexed: 11/28/2022]
Abstract
The genes gdh and pqqABCDE encoding glucose dehydrogenase and its pyrroloquinoline quinone cofactor were cloned from the mineral phosphate-solubilizing (MPS) bacterium Serratia marcescens CTM 50650. We investigated, for the first time, the impact of their coexpression in Escherichia coli on MPS ability. The production of recombinant PQQGDH conferred high MPS activity to the engineered E. coli. In fact, the amounts of soluble phosphorus (P) produced from tricalcium phosphate, hydroxyapatite, and Gafsa rock phosphate (GRP) were 574, 426, and 217 mg/L, respectively. In an attempt to increase the soluble P concentration, the E. coli strain coexpressing the gdh and pqqABCDE genes was immobilized in agar, calcium alginate, and k-carrageenan and was then further applied in a repeated batch (six batches) fermentation process to solubilize GRP. Compared to other encapsulated systems, alginate cell beads were noted to yield the highest concentration of soluble P, which attained 300 mg/L/batch. MPS efficiency was maximal in the presence of 5 and 40 g/L of GRP and glucose, respectively.
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Affiliation(s)
- Mounira Ben Farhat
- Laboratoire de Microorganismes et de Biomolécules, Centre de Biotechnologie de Sfax, Université de Sfax, Route de Sidi Mansour Km. 6, BP "1177", 3018 Sfax, Tunisia
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García-Fraile P, Carro L, Robledo M, Ramírez-Bahena MH, Flores-Félix JD, Fernández MT, Mateos PF, Rivas R, Igual JM, Martínez-Molina E, Peix Á, Velázquez E. Rhizobium promotes non-legumes growth and quality in several production steps: towards a biofertilization of edible raw vegetables healthy for humans. PLoS One 2012; 7:e38122. [PMID: 22675441 PMCID: PMC3364997 DOI: 10.1371/journal.pone.0038122] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Accepted: 04/30/2012] [Indexed: 11/18/2022] Open
Abstract
The biofertilization of crops with plant-growth-promoting microorganisms is currently considered as a healthy alternative to chemical fertilization. However, only microorganisms safe for humans can be used as biofertilizers, particularly in vegetables that are raw consumed, in order to avoid sanitary problems derived from the presence of pathogenic bacteria in the final products. In the present work we showed that Rhizobium strains colonize the roots of tomato and pepper plants promoting their growth in different production stages increasing yield and quality of seedlings and fruits. Our results confirmed those obtained in cereals and alimentary oil producing plants extending the number of non-legumes susceptible to be biofertilized with rhizobia to those whose fruits are raw consumed. This is a relevant conclusion since safety of rhizobia for human health has been demonstrated after several decades of legume inoculation ensuring that they are optimal bacteria for biofertilization.
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Affiliation(s)
- Paula García-Fraile
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
| | - Lorena Carro
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
| | - Marta Robledo
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Centro Hispano-Luso de Investigaciones Agrarias, Salamanca, Spain
| | - Martha-Helena Ramírez-Bahena
- Instituto de Recursos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
| | | | | | - Pedro F. Mateos
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Centro Hispano-Luso de Investigaciones Agrarias, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
| | - Raúl Rivas
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
| | - José Mariano Igual
- Instituto de Recursos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
| | - Eustoquio Martínez-Molina
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Centro Hispano-Luso de Investigaciones Agrarias, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
| | - Álvaro Peix
- Instituto de Recursos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
| | - Encarna Velázquez
- Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
- Unidad Asociada Grupo de Interacción planta-microorganismo, Universidad de Salamanca–Consejo Superior de Investigaciones Científicas, Salamanca, Spain
- * E-mail:
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Misra N, Gupta G, Jha PN. Assessment of mineral phosphate-solubilizing properties and molecular characterization of zinc-tolerant bacteria. J Basic Microbiol 2012; 52:549-58. [PMID: 22359218 DOI: 10.1002/jobm.201100257] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Accepted: 10/14/2011] [Indexed: 11/11/2022]
Abstract
Plant growth-promoting bacteria with the ability to tolerate heavy metals have importance both in sustainable agriculture and phytoremediation. The present study reports on the isolation and characterization of mineral phosphate-solubilizing (MPS) bacteria associated with the Achyranthes aspera L. plant (prickly chaff, flower plant). Out of 35 bacterial isolates, 6 isolates, namely RS7, RP23, EPR1, RS5, RP11 and RP19, with high MPS activity were selected and subjected to the assessment of MPS activity under various stress conditions, viz. ZnSO(4) (0.30-1.5 M), NaCl and temperature. MPS activity by the selected isolates was observed at concentrations of as high as >1.2 M ZnSO(4). Significant improvement in plant growth was observed on bacterization of seeds (pearl millet) with all of the six selected isolates. Plant growth was measured in terms of root length, shoot length, fresh weight and % increase in root biomass. The molecular diversity among the phosphate-solubilizing bacteria was studied employing enterobacterial repetitive intergenic sequence-PCR (ERIC-PCR). Representative strains from each ERIC type were identified, on the basis of a partial sequence of the 16S rRNA gene, as members of the genera Pseudomonas, Citrobacter, Acinetobacter, Serratia, and Enterobacter. Among all the isolates, RP19 was the best in terms of phosphate-solubizing activity and its response to various stresses. The ability of RP19 and other isolates to exhibit MPS activity at high ZnSO(4) concentrations suggests their potential as efficient biofertilizer for growing plants in metal (ZnSO(4))-contaminated soil.
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Affiliation(s)
- Neha Misra
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, Rajasthan, India
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Castagno LN, Estrella MJ, Sannazzaro AI, Grassano AE, Ruiz OA. Phosphate-solubilization mechanism and in vitro plant growth promotion activity mediated by Pantoea eucalypti isolated from Lotus tenuis rhizosphere in the Salado River Basin (Argentina). J Appl Microbiol 2011; 110:1151-65. [PMID: 21299771 DOI: 10.1111/j.1365-2672.2011.04968.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIMS To isolate and characterize phosphate-solubilizing strains from a constrained environment such as the Salado River Basin and to assess their phosphate-solubilizing mechanisms, to further selection of the most promising strains to inoculate and improve the implantation and persistence of Lotus tenuis in the most important area devoted to meat-cow production in Argentina. METHODS AND RESULTS Fifty isolates were obtained and through BOX-PCR analysis, 17 non-redundant strains were identified. Subsequently, they were found to be related to Pantoea, Erwinia, Pseudomonas, Rhizobium and Enterobacter genera, via 16S rRNA gene sequence analysis. This was in agreement with the clusters obtained by antibiotic resistance analysis. All isolates were tested for their phosphate-solubilizing activity and selected strains were inoculated onto L. tenuis plants. The most efficient isolate, was identified as Pantoea eucalypti, a novel species in terms of plant growth-promoting rhizobacteria. CONCLUSIONS The isolates obtained in this study showed a significant in vitro plant-growth promoting activity onto Lotus tenuis and the best of them solubilizes phosphate mainly via induction of the metabolism through secretion and oxidation of gluconic acid. SIGNIFICANCE AND IMPACT OF THE STUDY The use of these bacteria as bioinoculants, alone or in combination with nitrogen-fixing micro-organisms, could be a sustainable practice to facilitate the nutrient supply to Lotus tenuis plants and preventing negative side-effects such as eutrophication.
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Affiliation(s)
- L N Castagno
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnólogico de Chascomús, Chascomús, Argentina
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