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Nyamath S, Subburamu K, Kalyanasundaram GT, Balachandar D, Suresh M, Anandham R. Multifarious characteristics of sulfur-oxidizing bacteria residing in rice rhizosphere. Folia Microbiol (Praha) 2024; 69:395-405. [PMID: 37505441 DOI: 10.1007/s12223-023-01080-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 07/18/2023] [Indexed: 07/29/2023]
Abstract
Sulfur-oxidizing bacteria (SOB) are versatile microorganisms known for their ability to oxidize various reduced sulfur compounds, namely, elemental sulfur (S0), hydrogen sulfide (H2S), tetrathionate (S4O62-), and trithionate (S3O62-) to sulfate (SO42-). In this study, out of twelve SOB isolates from rice rhizosphere, five were screened based on their sulfur oxidation potential, viz., SOB1, SOB2, SOB3, SOB4, and SOB5, and were identified as Ochrobactrum soli SOB1, Achromobacter xylosoxidans SOB2, Stenotrophomonas maltophilia SOB3, Brucella tritici SOB4, and Stenotrophomonas pavanii SOB5, respectively. All the isolates displayed chemolithotrophic nutritional mode by consuming thiosulfate and accumulating trithionate and tetrathionate in the growth medium which is ultimately oxidized to sulfate. The strains were authenticated with the production of thiosulfate oxidizing enzymes such as rhodanese and sulfite oxidase. Despite their tendency to oxidize reduced sulfur compounds, B. tritici SOB4 and S. pavanii SOB5 were also found to possess phosphate and zinc solubilization potential, acetic acid, and indole acetic acid (IAA) production and 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity. The presence of sulfanyl (R-SH) groups was noticed in the A. xylosoxidans SOB2. Elemental sulfur conversion into sulfate was noted in the S. maltophilia SOB3, and hydrogen sulfide conversion into sulfate was observed in the Ochromobacter soli SOB1. Sulfur oxidation potential coupled with beneficial properties of the isolates widen the knowledge on SOB.
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Affiliation(s)
- Syed Nyamath
- Department of Agricultural Microbiology, Directorate of Natural Resource Management, Agricultural College and Research Institute, Coimbatore, 641003, India
| | - Karthikeyan Subburamu
- Department of Agricultural Microbiology, Directorate of Natural Resource Management, Agricultural College and Research Institute, Coimbatore, 641003, India.
- Centre for Post-Harvest Technology, Agricultural Engineering College and Research Institute, Coimbatore, 641003, India.
| | - Geetha Thanuja Kalyanasundaram
- Department of Agricultural Microbiology, Directorate of Natural Resource Management, Agricultural College and Research Institute, Coimbatore, 641003, India
| | - Dananjeyan Balachandar
- Department of Agricultural Microbiology, Directorate of Natural Resource Management, Agricultural College and Research Institute, Coimbatore, 641003, India
| | - Meena Suresh
- Department of Soil Science and Agricultural Chemistry, Agricultural College and Research Institute, Trichy, 620009, India
| | - Rangasamy Anandham
- Department of Agricultural Microbiology, Directorate of Natural Resource Management, Agricultural College and Research Institute, Coimbatore, 641003, India
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Waheed Z, Iqbal S, Irfan M, Jabeen K, Ilyas N, Al-Qahtani WH. Isolation and characterization of PGPR obtained from different arsenic-contaminated soil samples and their effect on photosynthetic characters of maize grown under arsenic stress. Environ Sci Pollut Res Int 2024; 31:18656-18671. [PMID: 38347363 DOI: 10.1007/s11356-024-31972-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 01/07/2024] [Indexed: 03/09/2024]
Abstract
Contamination of the environment due to speedup of anthropogenic activities has become a serious threat to modern humanity. Among the contaminants, the new emerging concern is the heavy metal (HM) contamination in the environment. Because the persistence and harmfulness of heavy metals affect the ecosystem and the health of plants, animals, and humans, they are the most toxic substances in the environment. Among them, Arsenic (As) emerged as major environmental constraint leading to enormous negative effects on the plant, animal, and human health. Even in minute quantity, As is known to cause various critical diseases in humans and toxicity in plants. Research was performed to observe the capability of plant growth-promoting strains of bacteria in enhancing Zea mays (L.) growth in arsenic polluted soil. Total 30 bacterial strains were isolated from the polluted soils, screened for plant growth promotion potential and arsenic tolerance. Eighteen isolates showed resistance to different levels of sodium arsenate (ranging from 0 to 50 mM) in agar plate using LB media. Of 18 isolates, 83.3% produced IAA, methyl red, and hydrogen cyanide; 55.5% exhibited catalase activity; 61.1% showed siderophore production; 88.8% showed phosphate solubilization; and 44.4% showed oxidase, Voges proskauer activity, and KOH solubility. The most efficient isolates SR3, SD5, and MD3 with significant arsenic tolerance and plant growth-promoting (PGP) activity were examined via sequencing of amplified 16S rRNA gene. Isolates of bacteria, i.e., SR3, SD5, and MD3, showing multiple PGP-traits were identified as Bacillus pumilus (NCBI accession number: OR459628), Paenibacillus faecalis (NCBI accession number: OR461560), and Pseudochrobactrum asaccharolyticum (NCBI accession number: OR458922), respectively. Maize seeds treated with these PGPR strains were grown in pots contaminated with 50 ppm and 100 ppm sodium arsenate. Compared to untreated arsenic stressed plants, bacterial inoculation P. asaccharolyticum (MD3) resulted 20.54%, 18.55%, 33.45%, 45.08%, and 48.55% improvement of photosynthetic pigments (carotenoid content, chlorophyll content, stomatal conductance (gs), substomatal CO2, and photosynthetic rate), respectively. Principal component analysis explained that first two components were more than 96% of the variability for each tested parameter. The results indicate that in comparison to other isolates, P. asaccharolyticum isolate can be used as efficient agent for improving maize growth under arsenic polluted soil.
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Affiliation(s)
- Zainab Waheed
- Department of Botany, Lahore College For Women University, Lahore, Pakistan
| | - Sumera Iqbal
- Department of Botany, Lahore College For Women University, Lahore, Pakistan.
| | - Muhammad Irfan
- KAM School of Life Sciences, Forman Christian College, Lahore, Pakistan
| | - Khajista Jabeen
- Department of Botany, Lahore College For Women University, Lahore, Pakistan
| | - Noshin Ilyas
- Department of Botany, PMAS-Arid Agriculture University, Rawalpindi, Pakistan
| | - Wahidah H Al-Qahtani
- Department of Food Sciences & Nutrition, College of Food & Agriculture Sciences, King Saud University, Riyadh, 11451, Saudi Arabia
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Iqbal Z, Ahmad M, Raza MA, Hilger T, Rasche F. Phosphate-Solubilizing Bacillus sp. Modulate Soil Exoenzyme Activities and Improve Wheat Growth. Microb Ecol 2024; 87:31. [PMID: 38228915 DOI: 10.1007/s00248-023-02340-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 12/30/2023] [Indexed: 01/18/2024]
Abstract
Phosphorus (P) is a vital mineral nutrient in agriculture and its deficiency results in reduced growth, yield, and grain quality in cereals. Much of the applied P in agriculture becomes fixed in soils, limiting its accessibility to plants. Thus, investigating sustainable strategies to release fixed P resources and enhance plant uptake is crucial. This study explored how plant-associated bacteria employ phosphate solubilizing mechanisms to improve P availability. The growth patterns of four bacterial strains, namely Bacillus subtilis ZE15 and ZR3, along with Bacillus megaterium ZE32 and ZR19, were examined in Pikovskaya's broth culture with and without the addition of insoluble phosphorus (P). In the absence of P amendment, most strains reached a stationary growth phase by the fourth day. However, their responses diverged when exposed to P-amended media. Particularly, ZE15 demonstrated the highest P solubilization capability, achieving up to 130 µg mL-1 solubilization in vitro. All strains produced organic acids in Pikovskaya's broth culture. A comparison of the influence of Ca3(PO4)2 revealed significantly greater organic acid quantities in the presence of insoluble P. Notably, strain ZE15 exhibited the highest phosphate esterase activity (3.65 nmol g-1 dry matter), while strain ZE32 showed the highest ß-D glucosidase activity (2.81 nmol g-1 dry matter) in the presence of insoluble P. The ability of Bacillus species to solubilize P in combination with increased exoenzyme activity in the rhizosphere could be used in future studies to support P uptake through enhanced solubilization and mineralization.
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Affiliation(s)
- Zafar Iqbal
- National Research Center of Intercropping, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan.
- Department of Soil Science, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan.
- Faculty of Agricultural Sciences, Institute of Agricultural Sciences in Tropics (Hans-Ruthenberg-Institute), University of Hohenheim, 70593, Stuttgart, Germany.
| | - Maqshoof Ahmad
- Department of Soil Science, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan
| | - Muhammad Ali Raza
- National Research Center of Intercropping, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan
- Ghansu Academy of Agricultural Sciences, Lanzhou, 730070, Gansu, China
| | - Thomas Hilger
- Faculty of Agricultural Sciences, Institute of Agricultural Sciences in Tropics (Hans-Ruthenberg-Institute), University of Hohenheim, 70593, Stuttgart, Germany
| | - Frank Rasche
- Faculty of Agricultural Sciences, Institute of Agricultural Sciences in Tropics (Hans-Ruthenberg-Institute), University of Hohenheim, 70593, Stuttgart, Germany.
- International Institute of Tropical Agriculture (IITA), PO Box 30772-00100, Nairobi, Kenya.
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Ortega-Ortega Y, Sarmiento-López LG, Baylón-Palomino A, Vázquez-Lee J, Maldonado-Bonilla LD, Flores-Olivas A, Valenzuela-Soto JH. Enterobacter sp. DBA51 produces ACC deaminase and promotes the growth of tomato ( Solanum lycopersicum L.) and tobacco ( Nicotiana tabacum L.) plants under greenhouse condition. Curr Res Microb Sci 2023; 6:100207. [PMID: 38187997 PMCID: PMC10770432 DOI: 10.1016/j.crmicr.2023.100207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024] Open
Abstract
Bacterial isolated from rhizospheric soil associated with the semi-desertic plant Coronilla juncea L. were screened for 1-aminocyclopropane-1-carboxylate deaminase (ACCD) activity, a common trait for plant-growth-promoting rhizobacteria (PGPR). Among bacterial isolates, strain DBA51 showed phosphate solubilizing index (PSI), producing indole acetic acid (IAA), and with the hemolysis-negative test. Sequencing and analysis of the 16S rDNA gene identified DBA51 as Enterobacter. DBA51 did not show antagonistic activity in vitro against bacterial (Clavibacter michiganensis, Pseudomonas syringae pv. tomato DC3000 and Pectobacterium cacticidum FHLGJ22) and fungal phytopathogens (Alternaria sp., Fusarium oxysporum fsp. lycopersici, Fusarium oxysporum fsp. cubense M5, and Rhizoctonia sp.). Root inoculations with DBA51 in tomato (Solanum lycopersicum L.) and tobacco (Nicotiana tabacum L.) plants were performed under greenhouse conditions. Plant height (20 %) and root biomass (40 %) were significantly enhanced in tomato plants inoculated with DBA51 compared to non-inoculated plants, although for tobacco plants, only root biomass (27 %) showed significant differences with DBA51. In addition, physiological parameters such as photosynthetic rate (µmol CO2 m-2 s-1), stomatal conductance (mol H2O m-2 s-1), and transpiration rate (mmol H2O m-2 s-1) were also evaluated, and no differences were detected between DBA51-inoculated and control treatment in tomato and tobacco leaves. The observed results indicate that the DBA51 strain could be used as a biofertilizer to improve yields of horticultural crops.
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Affiliation(s)
- Yolanda Ortega-Ortega
- Centro de Investigación en Química Aplicada, Departamento de Biociencias y Agrotecnología, Blvd. Enrique Reyna 104, 25294, Saltillo, Coahuila, Mexico
| | - Luis Gerardo Sarmiento-López
- Centro de Investigación en Química Aplicada, Departamento de Biociencias y Agrotecnología, Blvd. Enrique Reyna 104, 25294, Saltillo, Coahuila, Mexico
| | - Adolfo Baylón-Palomino
- Centro de Investigación en Química Aplicada, Departamento de Biociencias y Agrotecnología, Blvd. Enrique Reyna 104, 25294, Saltillo, Coahuila, Mexico
| | - Jairo Vázquez-Lee
- Centro de Investigación en Química Aplicada, Departamento de Biociencias y Agrotecnología, Blvd. Enrique Reyna 104, 25294, Saltillo, Coahuila, Mexico
| | | | - Alberto Flores-Olivas
- Universidad Autónoma Agraria Antonio Narro, Departamento de Parasitología, Buenavista, 25315, Saltillo, Coahuila, Mexico
| | - José Humberto Valenzuela-Soto
- Centro de Investigación en Química Aplicada, Departamento de Biociencias y Agrotecnología, Blvd. Enrique Reyna 104, 25294, Saltillo, Coahuila, Mexico
- CONAHCYT-Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna 104, 25294, Saltillo, Coahuila, Mexico
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Zelaya-Molina LX, Guerra-Camacho JE, Ortiz-Alvarez JM, Vigueras-Cortés JM, Villa-Tanaca L, Hernández-Rodríguez C. Plant growth-promoting and heavy metal-resistant Priestia and Bacillus strains associated with pioneer plants from mine tailings. Arch Microbiol 2023; 205:318. [PMID: 37615783 DOI: 10.1007/s00203-023-03650-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 07/26/2023] [Accepted: 08/06/2023] [Indexed: 08/25/2023]
Abstract
Open mine tailings dams are extreme artificial environments containing sizeable potentially toxic elements (PTEs), including heavy metals (HMs), transition metals, and metalloids. Furthermore, these tailings have nutritional deficiencies, including assimilable phosphorus sources, organic carbon, and combined nitrogen, preventing plant colonization. Bacteria, that colonize these environments, have mechanisms to tolerate the selective pressures of PTEs. In this work, several Priestia megaterium (formerly Bacillus megaterium), Bacillus mojavensis, and Bacillus subtilis strains were isolated from bulk tailings, anthills, rhizosphere, and endosphere of pioneer plants from abandoned mine tailings in Zacatecas, Mexico. Bacillus spp. tolerated moderate HMs concentrations, produced siderophores and indole-3-acetic acid (IAA), solubilized phosphates, and reduced acetylene in the presence of HMs. The strains harbored different PIB-type ATPase genes encoding for efflux pumps and Cation Diffusion Facilitator (CDF) genes. Moreover, nifH and nifD nitrogenase genes were detected in P. megaterium and B. mojavensis genomic DNA. They showed similarity with sequences of the beta-Proteobacteria species, which may represent likely horizontal transfer events. These Bacillus species precede the colonization of mine tailings by plants. Their phenotypic and genotypic features could be essential in the natural recovery of the sites by reducing the oxidative stress of HMs, fixing nitrogen, solubilizing phosphate, and accumulating organic carbon. These traits of the strains reflect the adaptations of Bacillus species to the mine tailings environment and could contribute to the success of phytoremediation efforts.
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Affiliation(s)
- Lily X Zelaya-Molina
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala S/N. Col. Sto. Tomás, C.P. 11340, Ciudad de México, México
- Centro Nacional de Recursos Genéticos-INIFAP, Boulevard de La Biodiversidad 400, Rancho Las Cruces, C.P. 47600, Tepatitlán de Morelos, Jalisco, México
| | - Jairo E Guerra-Camacho
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala S/N. Col. Sto. Tomás, C.P. 11340, Ciudad de México, México
| | - Jossue M Ortiz-Alvarez
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala S/N. Col. Sto. Tomás, C.P. 11340, Ciudad de México, México
- Programa "Investigadoras E Investigadores Por México". Consejo Nacional de Humanidades, Ciencias y Tecnologías (CONAHCyT), Av. de los Insurgentes Sur 1582, Crédito Constructor, Benito Juárez, C.P. 03940, Ciudad de México, México
| | - Juan M Vigueras-Cortés
- Laboratorio de Prototipos de Agua, Centro Interdisciplinario de Investigación Para El Desarrollo Integral Regional, IPN CIIDIR Durango, Sigma 119, Fracc. 20 de Noviembre II, C.P. 34220, Durango, Durango, México
| | - Lourdes Villa-Tanaca
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala S/N. Col. Sto. Tomás, C.P. 11340, Ciudad de México, México
| | - César Hernández-Rodríguez
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prol. de Carpio y Plan de Ayala S/N. Col. Sto. Tomás, C.P. 11340, Ciudad de México, México.
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Zuluaga MYA, de Oliveira ALM, Valentinuzzi F, Jayme NS, Monterisi S, Fattorini R, Cesco S, Pii Y. An insight into the role of the organic acids produced by Enterobacter sp. strain 15S in solubilizing tricalcium phosphate: in situ study on cucumber. BMC Microbiol 2023; 23:184. [PMID: 37438698 DOI: 10.1186/s12866-023-02918-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 06/28/2023] [Indexed: 07/14/2023] Open
Abstract
BACKGROUND The release of organic acids (OAs) is considered the main mechanism used by phosphate-solubilizing bacteria (PSB) to dissolve inorganic phosphate in soil. Nevertheless, little is known about the effect of individual OAs produced by a particular PSB in a soil-plant system. For these reasons, the present work aimed at investigating the effect of Enterobacter sp. strain 15S and the exogenous application of its OAs on (i) the solubilization of tricalcium phosphate (TCP), (ii) plant growth and (iii) P nutrition of cucumber. To this purpose two independent experiments have been performed. RESULTS In the first experiment, carried out in vitro, the phosphate solubilizing activity of Enterobacter 15S was associated with the release of citric, fumaric, ketoglutaric, malic, and oxalic acids. In the second experiment, cucumber plants were grown in a Leonard jar system consisting of a nutrient solution supplemented with the OAs previously identified in Enterobacter 15S (jar's base) and a substrate supplemented with the insoluble TCP where cucumber plants were grown (jar's top). The use of Enterobacter 15S and its secreted OAs proved to be efficient in the in situ TCP solubilization. In particular, the enhancement of the morpho-physiological traits of P-starved cucumber plants was evident when treated with Enterobacter 15S, oxalate, or citrate. The highest accumulation of P in roots and shoots induced by such treatments further corroborated this hypothesis. CONCLUSION In our study, the results presented suggest that organic acids released by Enterobacter 15S as well as the bacterium itself can enhance the P-acquisition by cucumber plants.
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Affiliation(s)
- Mónica Yorlady Alzate Zuluaga
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Piazza Università 5, Bolzano, 39100, Italy.
| | | | - Fabio Valentinuzzi
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Piazza Università 5, Bolzano, 39100, Italy
| | - Nádia Souza Jayme
- Department of Biochemistry and Biotechnology, State University of Londrina, Londrina, Paraná, Brazil
| | - Sonia Monterisi
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Piazza Università 5, Bolzano, 39100, Italy
| | - Roberto Fattorini
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Piazza Università 5, Bolzano, 39100, Italy
| | - Stefano Cesco
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Piazza Università 5, Bolzano, 39100, Italy
| | - Youry Pii
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, Piazza Università 5, Bolzano, 39100, Italy.
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Waday YA, Aklilu EG, Bultum MS, Ancha VR. Optimization of soluble phosphate and IAA production using response surface methodology and ANN approach. Heliyon 2022; 8:e12224. [PMID: 36582684 PMCID: PMC9792806 DOI: 10.1016/j.heliyon.2022.e12224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 06/16/2022] [Accepted: 11/30/2022] [Indexed: 12/13/2022] Open
Abstract
Phosphorus (P) is often found inaccessible to plants, as it forms precipitates with cations and can be converted to accessible forms by using Phosphate solubilizing bacteria (PSB). In the present study, isolation and characterization of PSB from rhizospheric soil of coffee plants were performed. The influence of four independent variables (incubation temperature, incubation time, pH, and inoculum size) was investigated and optimized using an artificial neural network and response surface methodology on the solubility of phosphate and indole acetic acid production. The bacterium that can dissolve phosphate were isolated in Pikovskaya's agar containing insoluble tricalcium phosphate. Total, six Phosphate Solubilizing Bacteria were isolated and three of them (PSB1, PSB3, and PSB4) were found to be effectively solubilizing phosphate. Based on phosphate solubilizing index results Pseudomonas bacteria (PSB1) was selected for modeling. The results showed that both models performed reasonably well, but properly trained artificial neural networks have the more powerful modeling capability compared to the response surface method. The optimum conditions were found to be incubation temperature of 37.5 °C, incubation time of 9 days, pH of 7.2, and inoculum size of 1.89 OD. Under these conditions, the model predicted solubility of phosphate of 260.69 μg/ml and production of IAA of 80.00 μg/ml with a desirability value of 0.947. In general, the isolated Pseudomonas is expected to have phosphorus-degrading ability that promotes plant growth, and further field experimental work is required to use this bacterial strain as biofertilizer, as an alternative to synthetic fertilizer.
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Affiliation(s)
- Yasin Ahmed Waday
- School of Chemical Engineering, Jimma Institute of Technology, Jimma University, Jimma 378, Ethiopia,Corresponding author.
| | - Ermias Girma Aklilu
- School of Chemical Engineering, Jimma Institute of Technology, Jimma University, Jimma 378, Ethiopia
| | - Mohammed Seid Bultum
- School of Chemical Engineering, Jimma Institute of Technology, Jimma University, Jimma 378, Ethiopia
| | - Venkata Ramayya Ancha
- Faculty of Mechanical Engineering, Jimma Institute of Technology, Jimma University, Jimma 378, Ethiopia
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Kumar V, Prasher IB. Phosphate solubilization and indole-3-acetic acid (IAA) produced by Colletotrichum gloeosporioides and Aspergillus fumigatus strains isolated from the rhizosphere of Dillenia indica L. Folia Microbiol (Praha) 2022; 68:219-229. [PMID: 36205912 DOI: 10.1007/s12223-022-01004-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 09/15/2022] [Indexed: 11/27/2022]
Abstract
Plants form associations with different microbes; some promote their growth and protect from biotic and abiotic stresses in different ways. However, the biological role of fungi associated with the rhizosphere of medicinal plants is not well explored. In the present study, Colletotrichum gloeosporioides, and Aspergillus fumigatus isolated from the rhizosphere of Dillenia indica were screened for their phosphate solubilization and indole-3-acetic acid (IAA) production potential. The selected fungal strains were identified by macroscopic, microscopic, and molecular characteristics. Phosphate solubilization was qualitatively and quantitatively evaluated using Pikovskaya's (PVK) agar and PVK broth medium using different substrates such as AlPO4, Ca3(PO4)2, and FePO4. Colletotrichum gloeosporioides and Aspergillus fumigatus with respect to the phosphate source showed solubilization index (SI) of 1.7 ± 0.03 and 2.1 ± 0.04, and solubilized phosphate up to 138.8 ± 0.058 µg/mL and 121.6 ± 0.062 µg/mL. These fungal strains are also good producers of IAA and significantly enhance the growth of Vigna radiata and Cicer arietinum seedlings. This is the first report on A. fumigatus and C. gloeosporioides from the rhizosphere of Dillenia indica and their phosphate solubilization and IAA production ability.
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Affiliation(s)
- Vijay Kumar
- Department of Botany, Panjab University, Chandigarh, 160014, India.
| | - I B Prasher
- Department of Botany, Panjab University, Chandigarh, 160014, India
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Nandeibam J, Singh YRB, Sharma KC, Devi KR, Mukherjee PK, Devi SI. Bacterial diversity of a floating vegetation (Phumdi) of Loktak Lake and its extracellular enzymes and bacterial antagonistic property. Arch Microbiol 2022; 204:657. [PMID: 36182972 DOI: 10.1007/s00203-022-03267-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/19/2022] [Accepted: 09/20/2022] [Indexed: 11/02/2022]
Abstract
134 bacterial strains were isolated from phumdis of Loktak Lake. Through 16S rRNA sequencing, Bacillus sp. (23, 17.1%), Staphylococcus sp. (14, 10.4%), Pseudomonas sp. (11, 8.2%) and Acinetobacter sp. (8, 5.9%) were identified as the predominant bacterial taxa of Loktak Lake. B. pumulis (12, 8.9%), S. arlettae (4, 2.9%), P. knackmussii (6, 4.4%) are the leading species of Bacillus, Staphylococcus and Pseudomonas, respectively. Similarly, A. seifertii (2, 1.4%) and A. calcoaceticus (2, 1.4%) are the common species of Acinetobacter. 75 (55.9%) bacterial strains showed the ability to hydrolyze one or more extracellular enzymes tested. Among the extracellular enzymes produced by the bacterial isolates, the presence of elastase activity cannot be underestimated, since the enzyme is involved in the process of bacterial lung infection. Phosphate solubilizing activity could be seen in 11.1% of the bacterial isolates. 27 (20.1%) of the strains shown to have antagonistic activity against one or more tested pathogens. An isolate, MRC 52 showed antagonistic activity against eleven different pathogens including carbapenem resistant E. coli which was further subjected to extraction and identification of the biomolecule exerting the antimicrobial property. Based on GC-MS analysis, the bioactive compound was identified as phenyl ethyl alcohol.
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Affiliation(s)
- Jusna Nandeibam
- Microbial Resources Division, Institute of Bioresources and Sustainable Development (IBSD), Takyelpat, Imphal, 795001, Manipur, India
| | - Y Randhir Babu Singh
- Microbial Resources Division, Institute of Bioresources and Sustainable Development (IBSD), Takyelpat, Imphal, 795001, Manipur, India
| | - K Chandradev Sharma
- Microbial Resources Division, Institute of Bioresources and Sustainable Development (IBSD), Takyelpat, Imphal, 795001, Manipur, India
| | - Kh Ranjana Devi
- Department of Microbiology, Regional Institute of Medical Sciences, Imphal, 795004, Manipur, India
| | - Pulok Kumar Mukherjee
- Phyto Pharmaceutical Laboratory, Institute of Bioresources and Sustainable Development (IBSD), Takyelpat, Imphal, 795001, Manipur, India
| | - S Indira Devi
- Microbial Resources Division, Institute of Bioresources and Sustainable Development (IBSD), Takyelpat, Imphal, 795001, Manipur, India.
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Albertini J, Rocha RK, Bastos RG, Ceccato-Antonini SR, Rosa-Magri MM. Phosphate solubilization and indole acetic acid production by rhizosphere yeast Torulaspora globosa: improvement of culture conditions for better performance in vitro. 3 Biotech 2022; 12:262. [PMID: 36091086 PMCID: PMC9448844 DOI: 10.1007/s13205-022-03322-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 08/22/2022] [Indexed: 11/24/2022] Open
Abstract
The rhizosphere yeast Torulaspora globosa is known to produce indole acetic acid (IAA) and to solubilize minerals. Due to the prospective use of this yeast as a biostimulant for agricultural applications, this work aimed to optimize the cultural conditions for both IAA production and phosphate solubilization. For phosphate solubilization, the temperature (20, 25 and 30 °C), initial medium pH (3.0, 5.0, and 7.0), and shaker speed (without mixing, 100 rpm, 150 rpm, and 200 rpm) were considered using the one-factor-at-a-time (OFAT) design. Temperature of 25 °C, initial medium pH 7.0, and static cultures were the conditions of greatest phosphate solubilization, with 40% of the total phosphorus content solubilized from calcium phosphate (419.86 mg L-1) after 48 h. By using the response surface methodology, the maximum IAA production (217.73 µg mL-1) was obtained with the highest initial pH 7.0, the lowest nitrogen, and glucose concentrations (5 g L-1 and 10 g L-1, respectively) and the lowest agitator speed (100 rpm). Further tests indicated that nitrogen affected significantly IAA production and the absence of nitrogen in the medium promoted higher IAA production (457 µg mL-1). The results obtained here may contribute to the scaling up for industrial and agricultural applications of a yeast-based product with T. globosa.
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Affiliation(s)
- Jessica Albertini
- Pós-Graduação Em Produção Vegetal E Bioprocessos Associados, Universidade Federal de São Carlos, Rod Anhanguera km 174, Araras, São Paulo, Brazil
| | - Renata K. Rocha
- Pós-Graduação Em Produção Vegetal E Bioprocessos Associados, Universidade Federal de São Carlos, Rod Anhanguera km 174, Araras, São Paulo, Brazil
| | - Reinaldo Gaspar Bastos
- Departamento de Tecnologia Agroindustrial E Socio-Economia Rural, Universidade Federal de São Carlos, Rod. Anhanguera km 174, Araras, São Paulo, Brazil
| | - Sandra Regina Ceccato-Antonini
- Departamento de Tecnologia Agroindustrial E Socio-Economia Rural, Universidade Federal de São Carlos, Rod. Anhanguera km 174, Araras, São Paulo, Brazil
| | - Márcia Maria Rosa-Magri
- Departamento de Recursos Naturais E Proteção Ambiental, Universidade Federal de São Carlos, Rod Anhanguera km 174, Araras, São Paulo, Brazil
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11
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Silambarasan S, Cornejo P, Vangnai AS. Biodegradation of 4-nitroaniline by novel isolate Bacillus sp. strain AVPP64 in the presence of pesticides. Environ Pollut 2022; 306:119453. [PMID: 35569624 DOI: 10.1016/j.envpol.2022.119453] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 04/22/2022] [Accepted: 05/07/2022] [Indexed: 06/15/2023]
Abstract
In this study, Bacillus sp. strain AVPP64 was isolated from diuron-contaminated soil. It showed 4-nitroaniline (4-NA) degradation, pesticide tolerance, and self-nutrient integration via nitrogen (N)-fixation and phosphate (P)-solubilization. The rate constant (k) and half-life period (t1/2) of 4-NA degradation in the aqueous medium inoculated with strain AVPP64 were observed to be 0.445 d-1 and 1.55 d, respectively. Nevertheless, in the presence of chlorpyrifos, profenofos, atrazine and diuron pesticides, strain AVPP64 degraded 4-NA with t1/2 values of 2.55 d, 2.26 d, 2.31 d and 3.54 d, respectively. The strain AVPP64 fixed 140 μg mL-1 of N and solubilized 103 μg mL-1 of P during the presence of 4-NA. In addition, strain AVPP64 produced significant amounts of plant growth-promoting metabolites like indole 3-acetic acid, siderophores, exo-polysaccharides and ammonia. In the presence of 4-NA and various pesticides, strain AVPP64 greatly increased the growth and biomass of Vigna radiata and Crotalaria juncea plants. These results revealed that Bacillus sp. strain AVPP64 can be used as an inoculum for bioremediation of 4-NA contaminated soil and sustainable crop production even when pesticides are present.
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Affiliation(s)
- Sivagnanam Silambarasan
- Centro de Investigación en Micorrizas y Sustentabilidad Agroambiental, CIMYSA, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile; Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Pablo Cornejo
- Centro de Investigación en Micorrizas y Sustentabilidad Agroambiental, CIMYSA, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile; Scientific and Technological Bioresource Nucleus, BIOREN-UFRO, Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile.
| | - Alisa S Vangnai
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence in Biocatalyst and Sustainable Biotechnology, Faculty of Science, Chulalongkorn University, Bangkok 10300, Thailand.
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12
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Shruti S, Afreen J, Rutuja A, Yasmin M. Development of miniaturized agar based assays in 96-well microplates applicable to high-throughput screening of industrially valuable microorganisms. J Microbiol Methods 2022; 199:106526. [PMID: 35738492 DOI: 10.1016/j.mimet.2022.106526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/15/2022] [Accepted: 06/15/2022] [Indexed: 11/25/2022]
Abstract
High-throughput screening (HTS) is a present-day approach for assaying thousands of cultures in parallel. This miniaturization allows rapid screening of large number of microorganims capable of producing bio-based materials thereby meeting the demands of the ever evolving food, pharmaceutical and cosmetic industry. In this study, agar-based assays for phosphate solubilization, cellulose degradation and lactic acid production were developed in 96-well microplates using Biomek FXP Automated Liquid Handling system. Techno-economic analysis from this study reveals the lower overall cost per assay using HTS as compared to conventional Petri plate assays. Though automated liquid handling workstations have been used to perform liquid-based assays, there are very few studies which report their use for agar-based microplate assays. These findings thus corroborate the establishment of rapid and efficient miniaturized, qualitative agar-based screening methods for identifying microorganisms with potential for commercial application.
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Affiliation(s)
- Sinha Shruti
- Praj-Matrix - R&D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune 412 115, Maharashtra, India; Department of Technology, Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, Maharashtra, India.
| | - Jikare Afreen
- Praj-Matrix - R&D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune 412 115, Maharashtra, India
| | - Ankulkar Rutuja
- Praj-Matrix - R&D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune 412 115, Maharashtra, India
| | - Mirza Yasmin
- Praj-Matrix - R&D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune 412 115, Maharashtra, India
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Jha V, Purohit H, Dafale NA. Revealing the potential of Klebsiella pneumoniae PVN-1 for plant beneficial attributes by genome sequencing and analysis. 3 Biotech 2021; 11:473. [PMID: 34777930 DOI: 10.1007/s13205-021-03020-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 10/05/2021] [Indexed: 12/28/2022] Open
Abstract
Genome sequencing of Klebsiella pneumoniae PVN-1, isolated from effluent treatment plant (ETP), generates a 5.064 Mb draft genome with 57.6% GC content. The draft genome assembled into 19 contigs comprises 4783 proteins, 3 rRNA, 44 tRNA, 8 other RNA, 4911 genes, and 73 pseudogenes. Genome information revealed the presence of phosphate metabolism/solubilizing, potassium solubilizing, auxin production, and other plant benefiting attributes like enterobactin and pyrroloquinoline quinone biosynthesis genes. Presence of gcd and pqq genes in K. pneumoniae PVN-1 genome validates the inorganic phosphate solubilizing potential (528.5 mg/L). Pangenome analysis identified a unique 5'-Nucleotidase that further assists in enhanced phosphate acquisition. Additionally, the genetic potential for complete benzoate, catechol, and phenylacetate degradation with stress response and heavy metal (Cu, Zn, Ni, Co) resistance was identified in K. pneumoniae PVN-1. Functioning of annotated plant benefiting genes validates by the metabolic activity of auxin production (7.40 µg/mL), nitrogen fixation, catalase activity, potassium solubilization (solubilization index-3.47), and protease activity (proteolytic index-2.27). In conclusion, the K. pneumoniae PVN-1 genome has numerous beneficial qualities that can be employed to enhance plant growth as well as for phytoremediation. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-03020-2.
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Sharma A, Dev K, Sourirajan A, Choudhary M. Isolation and characterization of salt-tolerant bacteria with plant growth-promoting activities from saline agricultural fields of Haryana, India. J Genet Eng Biotechnol 2021; 19:99. [PMID: 34181159 PMCID: PMC8239113 DOI: 10.1186/s43141-021-00186-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/21/2021] [Indexed: 02/06/2023]
Abstract
Background Soil salinity has been one of the biggest hurdles in achieving better crop yield and quality. Plant growth-promoting rhizobacteria (PGPR) are the symbiotic heterogeneous bacteria that play an important role in the recycling of plant nutrients through phytostimulation and phytoremediation. In this study, bacterial isolates were isolated from salt-polluted soil of Jhajjar and Panipat districts of Haryana, India. The potential salt-tolerant bacteria were screened for their PGPR activities such as phosphate solubilization, hydrogen cyanide (HCN), indole acetic acid (IAA) and ammonia production. The molecular characterization of potent isolates with salt tolerance and PGPR activity was done by 16S rDNA sequencing. Results Eighteen soil samples from saline soils of Haryana state were screened for salt-tolerant bacteria. The bacterial isolates were analyzed for salt tolerance ranging from 2 to 10%. Thirteen isolates were found salt tolerant at varied salt concentrations. Isolates HB6P2 and HB6J2 showed maximum tolerance to salts at 10% followed by HB4A1, HB4N3 and HB8P1. All the salt-tolerant bacterial isolates showed HCN production with maximum production by HB6J2. Phosphate solubilization was demonstrated by three isolates viz., HB4N3, HB6P2 and HB6J2. IAA production was maximum in HB4A1 (15.89) and HB6P2 (14.01) and least in HB4N3 (8.91). Ammonia production was maximum in HB6P2 (12.3) and least in HB8P1 (6.2). Three isolates HB6J2, HB8P1 and HB4N3 with significant salt tolerance, and PGPR ability were identified through sequencing of amplified 16SrRNA gene and were found to be Bacillus paramycoides, Bacillus amyloliquefaciens and Bacillus pumilus, respectively. Conclusions The salt-tolerant plant growth-promoting rhizobacteria (PGPR) isolated from saline soil can be used to overcome the detrimental effects of salt stress on plants, with beneficial effects of physiological functions of plants such as growth and yield, and overcome disease resistance. Therefore, application of microbial inoculants to alleviate stresses and enhance yield in plants could be a low cost and environmental friendly option for the management of saline soil for better crop productivity. Supplementary Information The online version contains supplementary material available at 10.1186/s43141-021-00186-3.
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Affiliation(s)
- Arti Sharma
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Bajhol, PO 173229, District Solan, Sultanpur, Himachal Pradesh, India
| | - Kamal Dev
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Bajhol, PO 173229, District Solan, Sultanpur, Himachal Pradesh, India
| | - Anuradha Sourirajan
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Bajhol, PO 173229, District Solan, Sultanpur, Himachal Pradesh, India.
| | - Madhu Choudhary
- ICAR-Central Soil Salinity Research Institute (CSSRI), Karnal, 132001, India.
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Abstract
Plant Growth Promoting Bacteria (PGPB) are a group of beneficial microorganisms that can positively influence plant fitness and development by improving nutrient acquisition, influencing global plant hormone levels (direct effect), or by reducing the detrimental effects of various pathogens on plant development (indirect effect). The use of PGPB in agriculture as formulated bioinoculants is a potential approach to reduce the negative environmental impacts caused by the continuous application of chemical fertilizers and pesticides. The evaluation of a great number of bacteria in the laboratory for key traits involved in the improvement of plant fitness is a suitable strategy to find prospective candidates for bioinoculants. This chapter presents the main methods described in the literature to quickly screen potential candidates from a bacterial collection to directly and indirectly promote the plant growth.
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Han Y, Liu S, Chen F, Deng X, Miao Z, Wu Z, Ye BC. Characteristics of plant growth-promoting rhizobacteria SCPG-7 and its effect on the growth of Capsicum annuum L. Environ Sci Pollut Res Int 2021; 28:11323-11332. [PMID: 33118066 DOI: 10.1007/s11356-020-11388-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 10/22/2020] [Indexed: 06/11/2023]
Abstract
The strain SCPG-7 was isolated from saline soil in a cotton field. It is confirmed that the strain SCPG-7 is Pseudomonas sp. by means of the analysis of its phenotypic features and 16S rRNA sequence. SCPG-7 was capable of dissolving mineral tri-calcium phosphate (Ca3(PO4)2) and tri-magnesium phosphate (Mg3(PO4)2). In contrast, no showing iron phosphate (FePO4) or aluminum phosphate (AlPO4) solubilizing activities were detected by this experimental approach. The ratio of the dissolved P diameter to the colony diameter was 1.86. To study the phosphate dissolving mechanisms of the strain, we analyzed the changes of the pH value, the soluble phosphate content, the concentration of alkaline phosphatase, and the production of organic acid in the insoluble phosphate liquid medium. 2-keto-D-gluconicacid, α-ketoglutaric acid, succinic acid, etc. were characterized by LC-MS/MS in NBRIP medium. The concentration of 2-keto-D-gluconicacid increased to 88.6 mg/L after being cultured for 216 h. The strain decreased the pH value of the medium from 7.4 to 4.7 and the released soluble phosphate up to 516 mg/L, which proved the production of organic acids and alkaline phosphatase to be mechanism for solubilizing P. Under low phosphorus stress, Pseudomonas global regulatory protein PhoB regulates the transcription of the alkaline phosphatase gene. IAA and siderophore were secreted by SCPG-7. After treatment with SCPG-7, the individual plant height and dry weight of pepper increased by 23.3 and 31.2%, respectively, compared to the control group. The results show that the strain SCPG-7 has the potential to convert insoluble inorganic phosphorus to plant-available phosphorus. It can enhance soil phosphorus release through biological pathways, thereby increasing crop yield, and providing germplasm resources for the development of biological fertilizers.
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Affiliation(s)
- Yajie Han
- School of Chemistry and Chemical Engineering/The Key Lab. for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, 832003, People's Republic of China
- College of Life Science, Shihezi University, Shihezi, 832003, People's Republic of China
| | - Shengxue Liu
- Analysis and Testing Center, Shihezi University, Shihezi, 832003, China
| | - Fulong Chen
- College of Life Science, Shihezi University, Shihezi, 832003, People's Republic of China
| | - Xiaolin Deng
- Teachers College, Shihezi University, Shihezi, 832003, People's Republic of China
| | - Zhuang Miao
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211800, China
| | - Zhansheng Wu
- School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
| | - Bang-Ce Ye
- School of Chemistry and Chemical Engineering/The Key Lab. for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, 832003, People's Republic of China.
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Kumar A, Voropaeva O, Maleva M, Panikovskaya K, Borisova G, Rajkumar M, Bruno LB. Bioaugmentation with copper tolerant endophyte Pseudomonas lurida strain EOO26 for improved plant growth and copper phytoremediation by Helianthus annuus. Chemosphere 2021; 266:128983. [PMID: 33272662 DOI: 10.1016/j.chemosphere.2020.128983] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 10/28/2020] [Accepted: 11/12/2020] [Indexed: 06/12/2023]
Abstract
Organic fertilizers became a better alternative to chemical fertilizers in modern agricultural practices however, contamination of copper (Cu) from organic fertilizer is still a major concern for the globe. Plant growth promoting (PGP) microorganisms showed their efficiency to combat with this problem and thus Cu tolerant PGP endophytes from roots of Odontarrhena obovata (Alyssum obovatum) growing on Cu smelter contaminated serpentine soil were explored in present study. Out of twenty-four isolates, Pseudomonas lurida strain EOO26 identified by 16s rRNA gene sequencing was selected to check its efficacy for Cu-remediation. The strain EOO26 showed multi-metal tolerance, drought resistance and exhibited PGP attributes such as 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, siderophore and ammonia production. Significant production of indole-3-acetic acid and phosphate-solubilization under different Cu concentration (0-100 mg L-1) at varying pH (5.0-8.0) suggests potentiality of this strain to work effectively under wide range of abiotic stress conditions. Plant growth experiment (pH 6.8 ± 0.3) in copper spiked soil suggested a significant increase in length and dry weight of root and shoot of sunflower (Helianthus annuus) after inoculation with strain EOO26. Plants inoculated with strain EOO26 resulted in increase in Cu uptake by 8.6-fold for roots and 1.9-fold for leaves than uninoculated plants. The total plant uptake in inoculated Cu treatment was 2.6-fold higher than uninoculated one, which is much higher than the previously reported Cu accumulating plants. The excellent adaptation abilities and promising metal removal efficiency strongly indicate superiority of strain EOO26 for phytoremediation of Cu-contamination and may work effectively for Cu removal from contaminated soils.
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Affiliation(s)
- Adarsh Kumar
- Laboratory of Biotechnology, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620002, Russia
| | - Olga Voropaeva
- Department of Experimental Biology and Biotechnology, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620002, Russia
| | - Maria Maleva
- Department of Experimental Biology and Biotechnology, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620002, Russia
| | - Ksenia Panikovskaya
- Department of Experimental Biology and Biotechnology, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620002, Russia
| | - Galina Borisova
- Department of Experimental Biology and Biotechnology, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620002, Russia
| | - Mani Rajkumar
- Department of Environmental Sciences, Bharathiar University, Coimbatore, 641046, India
| | - L Benedict Bruno
- Department of Environmental Sciences, Bharathiar University, Coimbatore, 641046, India
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Kumar P, Aeron A, Shaw N, Singh A, Bajpai VK, Pant S, Dubey RC. Seed bio-priming with tri-species consortia of phosphate solubilizing rhizobacteria (PSR) and its effect on plant growth promotion. Heliyon 2020; 6:e05701. [PMID: 33367127 PMCID: PMC7749380 DOI: 10.1016/j.heliyon.2020.e05701] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 10/17/2020] [Accepted: 12/08/2020] [Indexed: 11/08/2022] Open
Abstract
Three potential rhizobacteria namely Burkholderia gladioli (MTCC 10216), Pseudomonas sp. (MTCC 9002) and Bacillus subtilis (MTCC 8528) procured from IMTECH, Chandigarh (India) were evaluated individually and as consortia for its phosphate (P) solubilizing ability and effect of growth of fenugreek (Trigonella foenum-graecum L.) and tomato (Lycopersicon esculentum L.). Phosphate solubilizing ability of these strains individually and as consortia was tested on Pikovskayas agar medium, Phosphate solubilizing agar medium and National Botanical Research Institute phosphate agar medium containing six different sources of insoluble inorganic phosphate such as tri-calcium phosphate (TCP), di-calcium phosphate (DCP), zinc phosphate (ZP), ferric phosphate (FP), sodium di-hydrogen phosphate (SP), and aluminum phosphate (AP), and two organic P such as calcium and sodium phytate. The maximum P solubilizing ability was recorded in consortium-4 having all three potential bacterial strains. Phosphate solubilization after 7th day of incubation was 37.9 mg/100 ml of TCP, 40.01 mg/100 ml of DCP, 15.79 mg/100 ml of FP, 43.02 mg/100 ml of SP, no solubilization of ZP and AP, 39.75 mg/100 ml of calcium phytate and 24.01mg/100 ml of sodium phytate. Seed germination and the other plant parameters such as plant height and weight significantly increased in fenugreek and tomato seeds, bio-primed with consortium-4 followed by consortium-3. After bio-priming of seeds in pot assay, the level of phosphorus in soil got increased by 54% in consortium-4 treated soil followed by consortium-3 (47%) over untreated control soil. Based on these findings, consoritium-4 could be recommended as a good bio-inoculant for fenugreek, tomato and other crops in comparison to individual strains and other consortia.
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Affiliation(s)
- Pankaj Kumar
- Department of Microbiology, Dolphin (PG) College of Science and Agriculture, Chunni Kalan, Fatehgarh Sahib, Chandigarh, 140307, Punjab, India.,Department of Microbiology, Dolphin (PG) Institute of Biomedical and Natural Sciences, Dehradun, 248007, Uttarakhand, India
| | - Abhinav Aeron
- Department of Botany and Microbiology, Gurukul Kangri Vishwavidyalaya, Haridwar 249404, Uttarakhand, India
| | - Niru Shaw
- Department of Microbiology, Dolphin (PG) College of Science and Agriculture, Chunni Kalan, Fatehgarh Sahib, Chandigarh, 140307, Punjab, India
| | - Ajay Singh
- Department of Food Technology, Mata Gujri College, Fatehgarh Sahib, 140406, Punjab, India
| | - V K Bajpai
- Department of Energy and Materials Engineering, Dongguk University-Seoul, 30 Pildong-ro 1-gil, Seoul 04620, Republic of Korea
| | - Shailja Pant
- Department of Microbiology, Dolphin (PG) Institute of Biomedical and Natural Sciences, Dehradun, 248007, Uttarakhand, India
| | - Ramesh Chandra Dubey
- Department of Botany and Microbiology, Gurukul Kangri Vishwavidyalaya, Haridwar 249404, Uttarakhand, India
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Choudhary P, Bhowmik A, Chakdar H, Khan MA, Selvaraj C, Singh SK, Murugan K, Kumar S, Saxena AK. Understanding the biological role of PqqB in Pseudomonas stutzeri using molecular dynamics simulation approach. J Biomol Struct Dyn 2020; 40:4237-4249. [PMID: 33287678 DOI: 10.1080/07391102.2020.1854860] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Phosphate solubilization is an important and widely studied plant growth promoting trait exhibited by many bacteria. Pyrroloquinoline quinone (PQQ), a redox cofactor of methanol and glucose dehydrogenases has been well established as essential for phosphate solubilization. PQQ operon has been well studied in growth promoting rhizobacteria like Pseudomonas spp., Gluconobacter oxydans, Klebsiella pneumoniae, etc. However, the role of PqqB is quite ambiguous as its functional role has been contradicted in many studies. In the present study, we selected Pseudomonas stutzeri - a well-known P solubilizing bacterium as a representative species of the Pseudomonas genus on the basis of phylogenetic and statistical analyses of PqqB proteins. A 3 D model was generated for this protein. Docking of PqqB with PQQ showed good interaction with a theoretical binding affinity of -7.4 kcal/mol. On the other hand, docking of PqqC with 3a-(2-amino-2-carboxy-ethyl)-4,5-dioxo-4,5,6,7,8,9-hexahydro-quinoline-7,9-dicarboxylic acid (AHQQ, immediate precursor of PQQ) showed strong interaction (-10.4 kcal/mol) but the same was low with PQQ (-6.4 kcal/mol). Molecular dynamic simulation of both the complexes showed stable conformation. The binding energy of PqqB-PQQ complex (-182.710 ± 16.585 kJ/mol) was greater than PqqC-PQQ complex (-166.114 ± 12.027 kJ/mol). The results clearly indicated that kinetically there is a possibility that after cyclization of AHQQ to PQQ by PqqC, PQQ can be taken up by PqqB and transported to periplasm for the oxidation of glucose. To the best of our knowledge, this is the first attempt to understand the biological role of PqqB on the basis of molecular interactions and dynamics.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Prassan Choudhary
- Microbial Technology Unit-II, ICAR-National Bureau of Agriculturally Important Microorganisms, Mau Nath Bhanjan, India
| | - Arpan Bhowmik
- ICAR-Indian Agricultural Statistics Research Institute (IASRI), New Delhi, India
| | - Hillol Chakdar
- Microbial Technology Unit-II, ICAR-National Bureau of Agriculturally Important Microorganisms, Mau Nath Bhanjan, India
| | | | | | | | - Kumar Murugan
- Microbial Technology Unit-II, ICAR-National Bureau of Agriculturally Important Microorganisms, Mau Nath Bhanjan, India
| | - Sunil Kumar
- Centre for Agricultural Bioinformatics (CABIN), ICAR - Indian Agricultural Statistics Research Institute (IASRI), New Delhi, India
| | - Anil Kumar Saxena
- Microbial Technology Unit-II, ICAR-National Bureau of Agriculturally Important Microorganisms, Mau Nath Bhanjan, India
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20
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Yadav A, Singh RP, Singh AL, Singh M. Identification of genes involved in phosphate solubilization and drought stress tolerance in chickpea symbiont Mesorhizobium ciceri Ca181. Arch Microbiol 2020; 203:1167-1174. [PMID: 33226466 DOI: 10.1007/s00203-020-02109-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/06/2020] [Accepted: 10/23/2020] [Indexed: 10/22/2022]
Abstract
Chickpea plant root colonizing bacteria Mesorhizobium ciceri Ca181 promotes plant growth and development through symbiotic association with root nodules. The potentially beneficial effects on plants generated due to this bacterium are mineral nutrient solubilization, abiotic stress tolerance, and nitrogen-fixation, though the molecular mechanisms underlying these probiotic capacities are still largely unknown. Hence, this study aims to describe the molecular mechanism of M. ciceri Ca181 in drought stress tolerance and phosphorus solubilization. Here we have developed the transposon inserted mutant library of strain Ca181 and further screened it to identify the phosphorous solubilization and PEG-induced drought stress tolerance defective mutants, respectively. Resultantly, a total of four and three mutants for phosphorous solubilization and drought stress tolerance were screened and identified. Consequently, Southern blot confirmation was done for the cross verification of insertions and stability in the genome. Through the sequencing of each mutant, the interrupted gene was confirmed, and the finding revealed that the production of gluconic acid is necessary for phosphorus solubilization, while otsA, Auc, and Usp genes were involved in the mechanism of drought stress tolerance in M. ciceri Ca181.
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Affiliation(s)
- Akhilesh Yadav
- Department of Botany, Banaras Hindu University, Varanasi, 221005, India.
| | | | - Asha Lata Singh
- Department of Botany, Banaras Hindu University, Varanasi, 221005, India
| | - Major Singh
- Crop Improvement Division, ICAR-Indian Institute of Vegetable Research, Varanasi, 221305, India. .,ICAR-Directorate of Onion and Garlic Research, Pune, 410505, India.
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Sanyal A, Antony R, Ganesan P, Thamban M. Metabolic activity and bioweathering properties of yeasts isolated from different supraglacial environments of Antarctica and Himalaya. Antonie Van Leeuwenhoek 2020; 113:2243-2258. [PMID: 33219409 DOI: 10.1007/s10482-020-01496-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 10/29/2020] [Indexed: 11/26/2022]
Abstract
Yeasts have been frequently isolated from cold habitats, but their contribution to essential ecological processes such as the mineralization of organic matter in these environments is less known. Here, the diversity, metabolic capability, and extracellular enzyme profiles of yeasts from snow, blue ice and cryoconite hole environments from East Antarctica and cryoconite holes from a glacier in Western Himalaya were determined. Eighty-six yeast strains isolated were affiliated to the genera Glaciozyma, Goffeauzyma, Mrakia, Phenoliferia, and Rhodotorula. Variations in the abundance, diversity, physiological properties, extracellular enzyme and carbon substrate utilization patterns of the isolated yeasts, reflect the specific environmental conditions from which they were isolated. Overall, 20-90% of the yeasts across all habitat types and geographical locations produced extracellular enzymes to degrade proteins, esters, carbohydrates, pectin, cellulose, lignin, and tannin. About 10 and 29% of the yeasts also exhibited ability to solubilize rock-minerals like phosphate and silicate, respectively. Additionally, selected isolates were able to metabolize 28-93% of the carbon substrates comprising different compound classes on Biolog YT plates. Overall, the ability of yeasts to use diverse organic compounds prevalent on the glacier surface, points to their ecological significance in the decomposition of organic matter, cycling of nutrients, and in the weathering of minerals in supraglacial environments. Moreover, their wide metabolic capabilities suggest that they can colonize new niches and environments when meltwater export during the summer that enables links with surrounding ecosystems.
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Affiliation(s)
- Aritri Sanyal
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco da Gama, Goa, 403804, India.
| | - Runa Antony
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco da Gama, Goa, 403804, India
| | - Preethika Ganesan
- Department of Applied Microbiology, School of Bioscience and Technology, Vellore Institute of Technology, Vellore, 632014, India
- Department of Food Science, School of Chemical Sciences, University of Auckland, Auckland, 1010, New Zealand
| | - Meloth Thamban
- National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Headland Sada, Vasco da Gama, Goa, 403804, India
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Lebrazi S, Niehaus K, Bednarz H, Fadil M, Chraibi M, Fikri-Benbrahim K. Screening and optimization of indole-3-acetic acid production and phosphate solubilization by rhizobacterial strains isolated from Acacia cyanophylla root nodules and their effects on its plant growth. J Genet Eng Biotechnol 2020; 18:71. [PMID: 33175273 PMCID: PMC7658270 DOI: 10.1186/s43141-020-00090-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 11/02/2020] [Indexed: 11/18/2022]
Abstract
Background Plant growth-promoting rhizobacteria (PGPR) are known to improve plant growth and are used as biofertilizers, thanks to their numerous benefits to agriculture such as phosphorus solubilization and phytohormone production. In this paper, four rhizospheric bacteria (Phyllobacterium sp., Bacillus sp., Agrobacterium sp., and Rhizobium sp.) isolated from surface-sterilized root nodules of Acacia cyanophylla were tested for their ability to solubilize inorganic phosphate and to produce indole-3-acetic acid (IAA) under laboratory conditions. Then, the best IAA producer (Rhizobium sp.) was selected to test optimized conditions for IAA production. Finally, the effect of the four strains on plant growth for A. cyanophylla was evaluated in vivo. Results The results showed that the totality of the tested isolates had solubilized inorganic phosphate (P) in both NBRIP (National Botanical Research Institute Phosphate) and PVK (Pikovskaya) media. Bacillus sp. was a high P-solubilizer and showed maximum solubilization in PVK (519 μg ml-1) and NBRIP (782 μg ml-1). The optimization of maximum phosphate solubilization was done using different sources of carbon (1%) and nitrogen (0.1%). Glucose and ammonium sulfate were selected to be the best carbon and nitrogen source for phosphate solubilization by all tested strains, except for Phyllobacterium sp., which recorded the highest phosphate solubilization with ammonium nitrate. The IAA production by the tested strains indicated that Rhizobium sp. produced the highest amount of IAA (90.21 μg ml-1) in culture media supplemented with L-tryptophan. The best production was observed with L-Trp concentration of 0.2% (116.42 μg ml-1) and at an initial pH of 9 (116.07 μg ml-1). The effect of NaCl on IAA production was tested at concentrations of 0 to 5% and the maximum production of 89.43 μg ml-1 was found at 2% NaCl. The extraction of crude IAA from this strain was done and purity was confirmed with Thin Layer Chromatography (TLC) analysis. A specific spot from the extracted IAA production was found to correspond with a standard spot of IAA with the same Rf value. Finally, the tested PGPR demonstrated growth stimulatory effects on Acacia cyanophylla seedlings in vivo, with a great increase of shoots’ and roots’ dry weights, and shoot length compared to control. The rhizobacterial isolates were identified by 16S rDNA sequence analysis as Agrobacterium sp. NA11001, Phyllobacterium sp. C65, Bacillus sp. CS14, and Rhizobium sp. V3E1. Conclusion This study highlights the importance of the use of phosphate solubilizing and IAA producer microorganisms as biofertilizers to increase crop yields. The studied strains showed a significant phosphate solubilization potential and IAA production. The use of selected strains as inoculants would be interesting, in particular with a view of promoting sustainable agriculture. However, further studies to verify the efficacy of the best isolates in situ is certainly required.
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Affiliation(s)
- Sara Lebrazi
- Laboratory of Microbial Biotechnology, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco.
| | - Karsten Niehaus
- Proteome and Metabolome Research, Faculty of Biology Center for Biotechnology (CeBiTec), Bielefeld, Germany
| | - Hanna Bednarz
- Proteome and Metabolome Research, Faculty of Biology Center for Biotechnology (CeBiTec), Bielefeld, Germany
| | - Mouhcine Fadil
- Physico-Chemical Laboratory of Inorganic and Organic Materials, Materials Science Center (MSC), Ecole Normale Supérieure, Mohammed V University in Rabat, Rabat, Morocco
| | - Marwa Chraibi
- Laboratory of Microbial Biotechnology, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco
| | - Kawtar Fikri-Benbrahim
- Laboratory of Microbial Biotechnology, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco
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de Lima DRM, Dos Santos IB, Oliveira JTC, da Costa DP, de Queiroz JVJ, Romagnoli EM, Andreote FD, Freire FJ, Kuklinsky-Sobral J. Genetic diversity of N-fixing and plant growth-promoting bacterial community in different sugarcane genotypes, association habitat and phenological phase of the crop. Arch Microbiol 2020; 203:1089-1105. [PMID: 33161466 DOI: 10.1007/s00203-020-02103-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/15/2020] [Accepted: 10/19/2020] [Indexed: 10/23/2022]
Abstract
This study aimed to evaluate the genetic diversity of bacterial community associated to different sugarcane genotypes, association habitat and phenological phase of the culture, as well as to isolate, to identify and to characterize your potential for plant growth-promoting. Root and rhizospheric soil samples from RB 92579 and RB 867515 varieties were collected at 120 and 300 days after regrowth (DAR). The diversity of bacterial was evaluated through of the 16S rRNA and nifH genes. We found greater genetic diversity in the root endophytic habitat at 120 DAR. We identify the genera Burkholderia sp., Pantoea sp., Erwinia sp., Stenotrophomonas sp., Enterobacter sp. and Pseudomonas sp. The genera Bacillus sp. and Dyella sp. were only identified in the variety RB 92579. We found indices above 50% for biological nitrogen fixation, production of indole acetic acid and phosphate solubilization, showing that the use of these bacteria in biotechnological products is very promising.
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Affiliation(s)
| | - Isaneli Batista Dos Santos
- Departamento de Microbiologia Agrícola, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, 13418-900, Brasil
| | - João Tiago Correia Oliveira
- Instituto de Estudos do Trópico Úmido, Universidade Federal do Sul e Sudeste do Pará, Marabá, 68507-590, Brasil
| | - Diogo Paes da Costa
- Laboratório de Biotecnologia e Genética Microbiana, Universidade Federal do Agreste de Pernambuco, Garanhuns, 55292-270, Brasil
| | | | - Emiliana Manesco Romagnoli
- Departamento de Microbiologia Agrícola, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, 13418-900, Brasil
| | - Fernando Dini Andreote
- Departamento de Microbiologia Agrícola, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, 13418-900, Brasil
| | - Fernando José Freire
- Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Recife, 52171-900, Brasil.
| | - Júlia Kuklinsky-Sobral
- Laboratório de Biotecnologia e Genética Microbiana, Universidade Federal do Agreste de Pernambuco, Garanhuns, 55292-270, Brasil
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Lam MQ, Chen SJ, Goh KM, Abd Manan F, Yahya A, Shamsir MS, Chong CS. Genome sequence of an uncharted halophilic bacterium Robertkochia marina with deciphering its phosphate-solubilizing ability. Braz J Microbiol 2020; 52:251-256. [PMID: 33141351 DOI: 10.1007/s42770-020-00401-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/28/2020] [Indexed: 10/23/2022] Open
Abstract
The wide use of whole-genome sequencing approach in the modern genomic era has opened a great opportunity to reveal the prospective applications of halophilic bacteria. Robertkochia marina CC-AMO-30DT is one of the halophilic bacteria that was previously taxonomically identified without any inspection on its biotechnological potential from a genomic aspect. In this study, we present the whole-genome sequence of R. marina and demonstrated the ability of this bacterium in solubilizing phosphate by producing phosphatase. The genome of R. marina has 3.57 Mbp and contains 3107 predicted genes, from which 3044 are protein coding, 52 are non-coding RNAs, and 11 are pseudogenes. Several phosphatases such as alkaline phosphatases and pyrophosphatases were mined from the genome. Further genomic study (phylogenetics, sequence analysis, and functional mechanism) and experimental data suggested that the alkaline phosphatase produced by R. marina could potentially be utilized in promoting plant growth, particularly for plants on saline-based agricultural land.
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Affiliation(s)
- Ming Quan Lam
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Sye Jinn Chen
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Kian Mau Goh
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Fazilah Abd Manan
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Adibah Yahya
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Mohd Shahir Shamsir
- Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia (UTHM), Pagoh Higher Education Hub, 84600, Muar, Johor, Malaysia
| | - Chun Shiong Chong
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.
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Adhikari P, Pandey A. Bioprospecting plant growth promoting endophytic bacteria isolated from Himalayan yew (Taxus wallichiana Zucc.). Microbiol Res 2020; 239:126536. [PMID: 32738763 DOI: 10.1016/j.micres.2020.126536] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/16/2020] [Accepted: 06/24/2020] [Indexed: 11/21/2022]
Abstract
The present study aims to investigate the endophytic bacteria, isolated from the roots of Taxus wallichiana Zucc. and designated as GBPI_TWL and GBPI_TWr, for their plant growth promoting traits. On the basis of phenotypic and molecular characters, the bacteria are identified as species of Burkholderia and Enterobacter, respectively. Both the bacteria could grow at wide range of temperature (5-40 °C, opt=25 °C) and pH (1.5-11.0, opt = 6-7), and tolerate salt concentration up to 12 %. While both the bacterial endophytes possessed siderophore, HCN, ammonia, and salicyclic acid producing abilities, GBPI_TWL showed IAA and ACC deaminase producing abilities, in addition. The bacteria were found to be potential phosphate solubilizers at wide temperature range (5-35 °C) by utilizing tricalcium, iron, and aluminium phosphate as substrate. Further, the bacterial isolates produced phytase and phosphatase enzymes in both acidic and alkaline conditions. Positive influence of the inoculation with the bioformulations of GBPI_TWL and GBPI_TWr was demonstrated on the test crops namely rice (Oryza sativa) and soybean (Glycine max) with respect to physico-chemical and plant growth parameters in net house experiments. The study will have implications in developing bioformulations, specifically for low temperature environments, in view of environmental sustainability.
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Affiliation(s)
- Priyanka Adhikari
- Center for Environmental Assessment and Climate Change, G.B. Pant National Institute of Himalayan Environment, Kosi-Katarmal, Almora, 263643, Uttarakhand, India
| | - Anita Pandey
- Center for Environmental Assessment and Climate Change, G.B. Pant National Institute of Himalayan Environment, Kosi-Katarmal, Almora, 263643, Uttarakhand, India; Department of Biotechnology, Graphic Era Deemed to be University, Bell Road, Clement Town, Dehradun, 248002, Uttarakhand, India.
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Abstract
Background Burkholderia sp. SSG is a bacterial endophyte isolated from boxwood leaves showing a resistant response to infection by the boxwood blight pathogen Calonectria pseudonaviculata. SSG acted as a protective and curative biocontrol agent for boxwood blight and as a bio-sanitizer of disease inoculum in the field. Many gene clusters involved in antibiotic production and plant growth promotion (PGP) were found in the genome, giving this endophyte great application potential as a treatment for plant protection. However, the PGP features have not been documented. This study investigated the plant growth promotion activity of SSG in boxwood. Methods To determine whether SSG is a plant growth promoting bacterium, four PGP traits, auxin and siderophore production, nitrogen fixation and phosphate solubilization, were examined in the laboratory with colorimetric or agar plate assays. The plant growth promoting activity of SSG was tested on three boxwood varieties characterized by slow, intermediate and fast growth rates, namely Justin Brouwers, Buddy and Winter Gem, respectively. These plants were drenched with an SSG cell suspension or water and washed plant weight was compared before and after treatment to determine growth changes after 10 months. Results The SSG culture was sustainable on nitrogen free media, suggesting that SSG may fix atmospheric nitrogen. It was also a strong phosphate solubilizer and a potent siderophore and indole-3-acetic acid (IAA) producer. Significant growth promotion was observed on boxwood cultivars Justin Brouwers, Buddy and Winter Gem 10 months after plant roots were drenched with SSG cells. The growth rate of treated plants was 76.1, 58.3, and 37.3% higher than that of the control, respectively. The degree of growth promotion was significantly different among plant varieties, notably more pronounced with the slow and intermediate growers. This study demonstrates that the SSG bacterium has multiple PGP traits and is a prospective plant biofertilizer.
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Affiliation(s)
- Ping Kong
- Hampton Roads Agricultural Research and Extension Center, Virginia Polytechnic Institute and State University (Virginia Tech), Virginia Beach, VA, United States of America
| | - Chuanxue Hong
- Hampton Roads Agricultural Research and Extension Center, Virginia Polytechnic Institute and State University (Virginia Tech), Virginia Beach, VA, United States of America
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Abstract
Background Auxin production by bacteria is one of the most important direct mechanisms utilized by plant growth-promoting bacteria (PGPB) for the betterment of plants naturally because auxin is a plant friendly secondary metabolite synthesized naturally by bacteria, and hence improves the growth of associated plants. So, the current study focuses on bacterial synthesis of Indole-3-acetic acid (IAA) for plant growth improvement. Methods In the current study, the PGPB were selected on the basis of their auxin production potential and their growth promoting attributes were evaluated. Indole-3-acetic acid producing potential of two selected bacterial isolates was observed by varying different growth conditions i.e., media composition, carbon sources (glucose, sucrose and lactose) and different concentrations of precursor. Influence of various physiological factors (temperature and incubation time period) on IAA production potential was also evaluated. Results Both the bacterial strains Bacillus cereus (So3II) and B. subtilis (Mt3b) showed variable potential for the production of bacterial IAA under different set of growth and environmental conditions. Hence, the IAA production potential of the bacterial isolates can be enhanced by affecting optimum growth conditions for bacterial isolates and can be used for the optimal production of bacterial IAA and its utilization for plant growth improvement can lead to better yield in an eco-friendly manner.
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Affiliation(s)
- Shabana Wagi
- Department of Botany, University of the Punjab, Lahore, Punjab, Pakistan
| | - Ambreen Ahmed
- Department of Botany, University of the Punjab, Lahore, Punjab, Pakistan
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Srivastava AK, Saxena P, Sharma A, Srivastava R, Jamali H, Bharati AP, Yadav J, Srivastava AK, Kumar M, Chakdar H, Kashyap PL, Saxena AK. Draft genome sequence of a cold-adapted phosphorous-solubilizing Pseudomonas koreensis P2 isolated from Sela Lake, India. 3 Biotech 2019; 9:256. [PMID: 31192081 DOI: 10.1007/s13205-019-1784-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 05/30/2019] [Indexed: 12/20/2022] Open
Abstract
The draft genome sequence of a cold-adapted phosphorus-solubilizing strain Pseudomonas koreensis P2 isolated from the Sela Lake contains 6,436,246 bp with G + C content of 59.8%. The genome sequence includes 5743 protein coding genes, 68 non-protein coding genes, 1007 putative proteins, 5 rRNA genes, 64 tRNAs and two prophage regions in 40 contigs. Besides these, genes involved in phosphate solubilization, siderophore production, iron uptake, heat shock and cold shock tolerance, multidrug resistance and glycine-betaine production were also identified.
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Mahmood A, Iguchi R, Kataoka R. Multifunctional food waste fertilizer having the capability of Fusarium-growth inhibition and phosphate solubility: A new horizon of food waste recycle using microorganisms. Waste Manag 2019; 94:77-84. [PMID: 31279398 DOI: 10.1016/j.wasman.2019.05.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 05/22/2019] [Accepted: 05/24/2019] [Indexed: 06/09/2023]
Abstract
Organic waste, including food leftovers and trade refuse, has been explored for its use as a nutrient source through a multitude of techniques. Composting; the dominant method, is criticized due to exhaustion of nutrients used for simultaneous microbial growth. Drying of food waste to low moisture levels, besides keeping the nutrition intact, offers the potential of growing desirable phyto-beneficial-cum-functional microbes, which can have additional benefits. Consequently, isolation of fungus from soil was carried out followed by characterization for confrontation against Fusarium, phosphate solubilization and utilization of food waste material. The food waste material was collected from University of Yamanashi Restaurant and dried up to approximately 3.8% moisture using Hitachi Household Garbage Dryer & Processor (ECO-B25). A pot experiment, growing Lactuca sativa (lettuce) and Brassica rapa, in selected fungal isolate-inoculated food waste material was conducted comparing with that of chemical, and organic fertilizer besides uninoculated food waste material. Results showed that one strain UY2015_11 (identified as Aspergillus niger) significantly inhibited the growth of Fusarium besides solubilizing hardly available iron, and calcium-type phosphates. Similarly, in a 13-week incubation experiment, mineralization of nitrate nitrogen from the food waste and fungal strain UY2015_11-inoculated food waste, was 23.9% and 17.0%, respectively. Later pot experiment indicated that the strain UY2015_11-inoculated dried food waste material showed same vegetable growth as chemical and organic fertilizer (rapeseed oil cake). Concluding, Aspergillus niger strain UY2015_11 isolated from soil inhibited the growth of Fusarium and solubilized hardly phosphate. Moreover, the strain UY2015_11 inoculated low moisture-food waste material showed the same vegetable growth as chemical and organic fertilizer (rapeseed oil cake).
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Affiliation(s)
- Ahmad Mahmood
- University of Yamanashi, Faculty of Life & Environmental Sciences, Department of Environmental Sciences, Takeda, Kofu, Yamanashi, Japan
| | - Riho Iguchi
- University of Yamanashi, Faculty of Life & Environmental Sciences, Department of Environmental Sciences, Takeda, Kofu, Yamanashi, Japan
| | - Ryota Kataoka
- University of Yamanashi, Faculty of Life & Environmental Sciences, Department of Environmental Sciences, Takeda, Kofu, Yamanashi, Japan.
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Emami S, Alikhani HA, Pourbabaei AA, Etesami H, Sarmadian F, Motessharezadeh B. Effect of rhizospheric and endophytic bacteria with multiple plant growth promoting traits on wheat growth. Environ Sci Pollut Res Int 2019; 26:19804-19813. [PMID: 31090003 DOI: 10.1007/s11356-019-05284-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 04/25/2019] [Indexed: 05/22/2023]
Abstract
The present study focused on the characterization of plant growth promoting rhizospheric (R) and endophytic (E) bacteria and their impact on wheat cultivars growth. In this study, 400 strains were isolated from the rhizosphere soil (250 isolates) and surface-sterilized roots (150 isolates) of wheat and screened for their ability to plant growth promotion (PGP) traits. Four R isolates and four E isolates with different ability were selected to investigate the interaction between R and B bacteria associated with wheat cultivars under in vitro and greenhouse conditions. Plant growth parameters were found to be enhanced by the combined inoculation of two groups of R and E bacteria compared to individual inoculations (respectively 33.7 and 37.8% increase in root and shoot dry weight), suggesting that PGP rhizobacteria acted synergistically with PGP endophytes in phosphate solubilization. Compared to inoculation with phosphate-solubilizing bacteria (PSB) or indole-3-acetic acid producer bacteria (IAA-PB), inoculation by bacteria with multiple PGP properties (PSB and IAA-PS) showed higher promotion capacity. Also, in greenhouse assay, bacterial inoculation had a positive effect on the soil dehydrogenase (70.2%) and phosphatase (52.2%) activity. It seems PGP traits do not work independently of each other but additively as it was suggested in the "synergistic hypothesis" that multiple mechanisms are responsible for the plant growth promotion and increased yield. Findings of this study could improve the current bio-fertilizer production procedure in research and related industries.
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Affiliation(s)
- Somayeh Emami
- Department of Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, 31587-77871, Iran.
| | - Hossein Ali Alikhani
- Department of Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, 31587-77871, Iran
| | - Ahmad Ali Pourbabaei
- Department of Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, 31587-77871, Iran
| | - Hassan Etesami
- Department of Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, 31587-77871, Iran
| | - Fereydoon Sarmadian
- Department of Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, 31587-77871, Iran
| | - Babak Motessharezadeh
- Department of Soil Science Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, 31587-77871, Iran
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Sánchez-Cruz R, Tpia Vázquez I, Batista-García RA, Méndez-Santiago EW, Sánchez-Carbente MDR, Leija A, Lira-Ruan V, Hernández G, Wong-Villarreal A, Folch-Mallol JL. Isolation and characterization of endophytes from nodules of Mimosa pudica with biotechnological potential. Microbiol Res 2018; 218:76-86. [PMID: 30454661 DOI: 10.1016/j.micres.2018.09.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 09/20/2018] [Accepted: 09/28/2018] [Indexed: 02/04/2023]
Abstract
Legumes establish symbiotic relationships with different microorganisms, which could function as plant growth promotion microorganisms (PGPM). The finding of new PGPM strains is important to increase plant production avoiding or diminishing the use of industrial fertilizers. Thus, in this work we evaluated the plant growth promotion traits of ten strains isolated from Mimosa pudica root nodules. According to the 16S rDNA sequence, the microorganisms were identified as Enterobacter sp. and Serratia sp. To the best of our knowledge this is the first report describing and endophytic interaction between Mimosa pudica and Enterobacter sp. These strains have some plant growth promoting traits such as phosphate solubilization, auxin production and cellulase and chitinase activity. Strains identified as Serratia sp. inhibited the growth of the phytopathogenic fungi Fusarium sp., and Alternaria solani and the oomycete Phytophthora capsici. According to their biochemical characteristics, three strains were selected to test their plant growth promoting activity in a medium with an insoluble phosphate source. These bacteria show low specificity for their hosts as endophytes, since they were able to colonize two very different legumes: Phaseolus vulgaris and M. pudica. Seedlings of P. vulgaris were inoculated and grown for fifteen days. Enterobacter sp. NOD1 and NOD10, promoted growth as reflected by an increase in shoot height as well as an increase in the size and emergence of the first two trifolia. We could localize NOD5 as an endophyte in roots in P. vulgaris by transforming the strain with a Green Fluorescent Protein carrying plasmid. Experiments of co-inoculation with different Rhizobium etli strains allowed us to discard that NOD5 can fix nitrogen in the nodules formed by a R. etli Fix- strain. The isolates described in this work show biotechnological potential for plant growth promoting activity and production of indoleacetic acid and siderophores.
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Affiliation(s)
- Ricardo Sánchez-Cruz
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | - Irán Tpia Vázquez
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | - Ramón Alberto Batista-García
- Centro de Investigación en Dinámica Celular, IICBA, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | | | | | - Alfonso Leija
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| | - Verónica Lira-Ruan
- Centro de Investigación en Dinámica Celular, IICBA, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | - Gerogina Hernández
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| | | | - Jorge Luis Folch-Mallol
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico.
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Tchuisseu Tchakounté GV, Berger B, Patz S, Fankem H, Ruppel S. Community structure and plant growth-promoting potential of cultivable bacteria isolated from Cameroon soil. Microbiol Res 2018; 214:47-59. [PMID: 30031481 DOI: 10.1016/j.micres.2018.05.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 03/30/2018] [Accepted: 05/09/2018] [Indexed: 01/01/2023]
Abstract
Exploiting native plant growth-promoting rhizobacteria (PGPR) in Cameroonian agro-ecosystems provides a means to improve plant-microbe interactions that may enhance ecosystem sustainability and agricultural productivity in an environmentally eco-friendly way. Consequently, we aimed to investigate the community structure and functional PGPR diversity of maize grown in Cameroon. Native bacteria isolated from Cameroon maize rhizosphere soil were identified by partial 16S rRNA gene sequencing and screened for traits particularly relevant for Cameroon low-fertility soil conditions, such as their abilities to tolerate high concentrations of salt, and their plant growth- promoting potential. Genetic and functional diversity was characterized according to their phylogenetic affiliation. A total of 143 bacteria were identified and assigned to 3 phyla (Actinobacteria, Firmicutes and Proteobacteria), 13 families and 20 genera. Bacillus (31.5%), Arthrobacter (17.5%), and Sinomonas (13.3%) were the most abundant genera identified among all the isolates. Based on their in vitro characterization, 88.1% were salt tolerant at 2% NaCl, but only 16.8% could tolerate 8% NaCl, 50.4% solubilized phosphate, 10.5% possessed the nifH gene, and 19.6% produced siderophores. Six isolates affiliated to the most abundant genera identified in this work, Bacillus and Arthrobacter, carrying multiple or only single tested traits were selected to evaluate their growth- promoting potential in an in vitro maize germination assay. Three strains possessing multiple traits induced significantly increased hypocotyl and root length of maize seeds compared to non-inoculated control seeds. Our results indicate the potential of selected indigenous Cameroon rhizobacteria to enhance maize growth.
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Gupta P, Kumar V, Usmani Z, Rani R, Chandra A. Phosphate solubilization and chromium (VI) remediation potential of Klebsiella sp. strain CPSB4 isolated from the chromium contaminated agricultural soil. Chemosphere 2018; 192:318-327. [PMID: 29117590 DOI: 10.1016/j.chemosphere.2017.10.164] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 10/21/2017] [Accepted: 10/29/2017] [Indexed: 05/25/2023]
Abstract
In this study, an effort was made to identify an efficient phosphate solubilizing bacterial strain from chromium contaminated agricultural soils. Based on the formation of a solubilized halo around the colonies on Pikovskaya's agar amended with chromium (VI), 10 strains were initially screened out. Out of 10, strain CPSB4, which showed significantly high solubilization zone at different chromium concentrations, was selected for further study. The strain CPSB4 showed significant plant growth promotion traits with chromium (VI) stress under in-vitro conditions in broth. The plant growth promotion activities of the strain decreased regularly, but were not completely lost with the increase in concentration of chromium up to 200 mg L-1. On subjected to FT-IR analysis, the presence of the functional group, indicating the organic acid aiding in phosphate solubilization was identified. At an optimal temperature of 30 °C and pH 7.0, the strain showed around 93% chromium (VI) reduction under in-vitro conditions in broth study. In soil condition, the maximum chromium (VI) reduction obtained was 95% under in-vitro conditions. The strain CPSB4 was identified as Klebsiella sp. on the basis of morphological, biochemical and 16S rRNA gene sequencing. This study shows that the diverse role of the bacterial strain CPSB4 would be useful in the chromium contaminated soil as a good bioremediation and plant growth promoting agent as well.
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Affiliation(s)
- Pratishtha Gupta
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India
| | - Vipin Kumar
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India.
| | - Zeba Usmani
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India
| | - Rupa Rani
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India
| | - Avantika Chandra
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India
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Hossain MM, Sultana F. Methods for the Characterization of Plant-Growth Promoting Rhizobacteria. Methods Mol Biol 2018; 1734:307-28. [PMID: 29288464 DOI: 10.1007/978-1-4939-7604-1_24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
A detailed description of methods most frequently used for the identification and characterization of beneficial microbial strains is presented in this chapter. The methods include microbiological, biochemical, and molecular approaches. Microbiological and biochemical methods comprise a broad range of techniques that are based on the analysis of phosphate solubilization, nitrogenase activity, indole-3-acetic acid production, bacterial motility, presence of catalase and nitrate reductase enzyme, Gram's staining of the cell wall, siderophore production, and microbial chemotaxis. The molecular methods involve a range of techniques that are based on the extraction and analysis of microbial DNA. The extracted nucleic acid can be specifically amplified using polymerase chain reaction (PCR), and subsequently cloned and sequenced. The sequencing of conserved genes such as internal transcribed spacer (ITS) region or 16S rRNA in a microbial genome is used extensively in resolving taxonomic identity of microbial strains. These methods are highly sensitive and allow for a high degree of specificity.
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Hassan SE. Plant growth-promoting activities for bacterial and fungal endophytes isolated from medicinal plant of Teucrium polium L. J Adv Res 2017; 8:687-95. [PMID: 28951786 DOI: 10.1016/j.jare.2017.09.001] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 08/23/2017] [Accepted: 09/09/2017] [Indexed: 11/24/2022] Open
Abstract
Bacterial and fungal endophytes are widespread inhabitants inside plant tissues and have been shown to assist plant growth and health. However, little is known about plant growth-promoting endophytes (PGPE) of medicinal plants. Therefore, the aims of this study were to identify bacterial and fungal endophytes of Teucrium polium and to characterize plant growth-promoting (PGP) properties of these endophytes. Seven bacterial endophytes were isolated and identified as Bacillus cereus and Bacillus subtilis, where five endophytic fungi were obtained and assigned to Penicillium chrysogenum and Penicillium crustosum. The isolated endophytes differentially produced indole acetic acid (IAA) and ammonia, and in addition to their enzymatic and antimicrobial activities, they exhibited variable capacity for phosphate solubilization. In order to investigate the effect of endophytes on plant growth, four representative endophytes and their consortiums were selected concerning to their potential ability to promote plant growth. The results indicated that microbial endophytes isolated from medicinal plants possessing a vital role to improve plant growth and could be used as inoculants to establish a sustainable crop production system.
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Romero-Perdomo F, Abril J, Camelo M, Moreno-Galván A, Pastrana I, Rojas-Tapias D, Bonilla R. Azotobacter chroococcum as a potentially useful bacterial biofertilizer for cotton (Gossypium hirsutum): Effect in reducing N fertilization. Rev Argent Microbiol 2017; 49:377-83. [PMID: 28864227 DOI: 10.1016/j.ram.2017.04.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 01/25/2017] [Accepted: 04/21/2017] [Indexed: 01/03/2023] Open
Abstract
The aim of this research was to evaluate whether the application of two plant growth-promoting (rhizo)bacteria might reduce nitrogen fertilization doses in cotton. We used strains Azotobacter chroococcum AC1 and AC10 for their proven ability to promote seed germination and cotton growth. These microorganisms were characterized by their plant growth-promoting activities. Then, we conducted a glasshouse study to evaluate the plant growth promoting ability of these strains with reduced doses of urea fertilization in cotton. Results revealed that both strains are capable of fixing nitrogen, solubilizing phosphorus, synthesizing indole compounds and producing hydrolytic enzymes. After 12 weeks, the glasshouse experiment showed that cotton growth was positively influenced due to bacterial inoculation with respect to chemical fertilization. Notably, we observed that microbial inoculation further influenced plant biomass (p<0.05) than nitrogen content. Co-inoculation, interestingly, exhibited a greater beneficial effect on plant growth parameters compared to single inoculation. Moreover, similar results without significant statistical differences were observed among bacterial co-inoculation plus 50% urea and 100% fertilization. These findings suggest that co-inoculation of A. chroococcum strains allow to reduce nitrogen fertilization doses up to 50% on cotton growth. Our results showed that inoculation with AC1 and AC10 represents a viable alternative to improve cotton growth while decreasing the N fertilizer dose and allows to alleviate the environmental deterioration related to N pollution.
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Brígido C, Glick BR, Oliveira S. Survey of Plant Growth-Promoting Mechanisms in Native Portuguese Chickpea Mesorhizobium Isolates. Microb Ecol 2017; 73:900-915. [PMID: 27904921 DOI: 10.1007/s00248-016-0891-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 10/31/2016] [Indexed: 06/06/2023]
Abstract
Rhizobia may possess other plant growth-promoting mechanisms besides nitrogen fixation. These mechanisms and the tolerance to different environmental factors, such as metals, may contribute to the use of rhizobia inocula to establish a successful legume-rhizobia symbiosis. Our goal was to characterize a collection of native Portuguese chickpea Mesorhizobium isolates in terms of plant growth-promoting (PGP) traits and tolerance to different metals as well as to investigate whether these characteristics are related to the biogeography of the isolates. The occurrence of six PGP mechanisms and tolerance to five metals were evaluated in 61 chickpea Mesorhizobium isolates previously obtained from distinct provinces in Portugal and assigned to different species clusters. Chickpea microsymbionts show high diversity in terms of PGP traits as well as in their ability to tolerate different metals. All isolates synthesized indoleacetic acid, 50 isolates produced siderophores, 19 isolates solubilized phosphate, 12 isolates displayed acid phosphatase activity, and 22 exhibited cytokinin activity. Most isolates tolerated Zn or Pb but not Ni, Co, or Cu. Several associations between specific PGP mechanisms and the province of origin and species clusters of the isolates were found. Our data suggests that the isolate's tolerance to metals and ability to solubilize inorganic phosphate and to produce IAA may be responsible for the persistence and distribution of the native Portuguese chickpea Mesorhizobium species. Furthermore, this study revealed several chickpea microsymbionts with potential as PGP rhizobacteria as well as for utilization in phytoremediation strategies.
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Affiliation(s)
- Clarisse Brígido
- ICAAM-Instituto de Ciências Agrárias e Ambientais Mediterrânicas (Laboratório de Microbiologia do Solo), Universidade de Évora, Núcleo da Mitra, Ap. 94, 7002-554, Évora, Portugal
- IIFA-Instituto de Investigação e Formação Avançada, Universidade de Évora, Ap. 94, 7002-554, Évora, Portugal
| | - Bernard R Glick
- Department of Biology, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
| | - Solange Oliveira
- ICAAM-Instituto de Ciências Agrárias e Ambientais Mediterrânicas (Laboratório de Microbiologia do Solo), Universidade de Évora, Núcleo da Mitra, Ap. 94, 7002-554, Évora, Portugal.
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Chauhan A, Guleria S, Balgir PP, Walia A, Mahajan R, Mehta P, Shirkot CK. Tricalcium phosphate solubilization and nitrogen fixation by newly isolated Aneurinibacillus aneurinilyticus CKMV1 from rhizosphere of Valeriana jatamansi and its growth promotional effect. Braz J Microbiol 2016; 48:294-304. [PMID: 28063921 PMCID: PMC5470448 DOI: 10.1016/j.bjm.2016.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 05/30/2016] [Indexed: 11/19/2022] Open
Abstract
Aneurinibacillus aneurinilyticus strain CKMV1 was isolated from rhizosphere of Valeriana jatamansi and possessed multiple plant growth promoting traits like production of phosphate solubilization (260 mg/L), nitrogen fixation (202.91 nmol ethylene mL−1 h−1), indole-3-acetic acid (IAA) (8.1 μg/mL), siderophores (61.60%), HCN (hydrogen cyanide) production and antifungal activity. We investigated the ability of isolate CKMV1 to solubilize insoluble P via mechanism of organic acid production. High-performance liquid chromatography (HPLC) study showed that isolate CKMV1 produced mainly gluconic (1.34%) and oxalic acids. However, genetic evidences for nitrogen fixation and phosphate solubilization by organic acid production have been reported first time for A. aneurinilyticus strain CKMV1. A unique combination of glucose dehydrogenase (gdh) gene and pyrroloquinoline quinone synthase (pqq) gene, a cofactor of gdh involved in phosphate solubilization has been elucidated. Nitrogenase (nif H) gene for nitrogen fixation was reported from A. aneurinilyticus. It was notable that isolate CKMV1 exhibited highest antifungal against Sclerotium rolfsii (93.58%) followed by Fusarium oxysporum (64.3%), Dematophora necatrix (52.71%), Rhizoctonia solani (91.58%), Alternaria sp. (71.08%) and Phytophthora sp. (71.37%). Remarkable increase was observed in seed germination (27.07%), shoot length (42.33%), root length (52.6%), shoot dry weight (62.01%) and root dry weight (45.7%) along with NPK (0.74, 0.36, 1.82%) content of tomato under net house condition. Isolate CKMV1 possessed traits related to plant growth promotion, therefore, could be a potential candidate for the development of biofertiliser or biocontrol agent and this is the first study to include the Aneurinibacillus as PGPR.
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Affiliation(s)
- Anjali Chauhan
- Dr Y. S. Parmar University of Horticulture and Forestry, Department of Basic Sciences Microbiology Section, Nauni, Solan, India
| | - Shiwani Guleria
- Lovely Professional University, Department of Microbiology, Jalandhar, Punjab, India
| | - Praveen P Balgir
- Punjabi University Patiala, Department of Biotechnology, Patiala, Punjab, India
| | - Abhishek Walia
- DAV University, Department of Microbiology, Jalandhar, Punjab, India
| | - Rishi Mahajan
- Jaypee University of Information Technology, Waknaghat, Himachal Pradesh, India
| | - Preeti Mehta
- DBT-IOC Centre for Bioenergy Research, Indian Oil R&D Centre, Faridabad, Haryana, India
| | - Chand Karan Shirkot
- Dr Y. S. Parmar University of Horticulture and Forestry, Department of Basic Sciences, Nauni, Solan, India.
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Goljanian-Tabrizi S, Amiri S, Nikaein D, Motesharrei Z. The comparison of five low cost liquid formulations to preserve two phosphate solubilizing bacteria from the genera Pseudomonas and Pantoea. Iran J Microbiol 2016; 8:377-382. [PMID: 28491248 PMCID: PMC5420392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVES Phosphorus is one of the low bioavailable macroelements. Use of microorganisms in biofertilizers could release phosphorus from insoluble compounds. Pseudomonas putida P13 and Pantoea agglomerans P5 are well recognized for application as phosphate solubilizing bioinoculants and are used as solid carrier based. Liquid bioinoculants are preferred for economizing production process and longer shelf-life. MATERIALS AND METHODS Five low cost liquid formulations were examined. Formulations 1, 2 and 3, were phosphate buffer, 0.2% and 0.5% KNO3 dissolved in phosphate buffer, respectively. Formulation 4 was nutrient broth containing 4% glycerol and formulation 5 was diluted nutrient broth containing 4% glycerol. Survival (cfu) and phosphate solubilization index (SI) were evaluated after 3 months. RESULTS Considering strain P5, increase in KNO3 concentration decreased preserving ability. While using KNO3 at 0.2% was accompanied with reaching maximum SI level. Overall, less nutritious formulations (1 and 5) provided maximum preserving ability without bioactivity loss. In the case of strain P13, maximum survival obtained in formulations 2 and 3, whereas SI level decreased. Preserving ability in formulations 1, 4 and 5 was similar but less nutritious formulations (1 and 5), improved bioactivity. CONCLUSION The results introduced two formulations of 1 and 5 as economically efficient liquid bioinoculants for Pseudomonas putida and Pantoea agglomerans.
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Affiliation(s)
- Sanaz Goljanian-Tabrizi
- Corresponding author: Sanaz Goljanian-Tabrizi, MSc, Applied Microbiology Research Group, Academic Center for Education Culture and Research, (ACECR), Tehran Branch, Tehran, Iran. Tel: 98-21-66405080-107, Fax: 98-21-66495778,
| | - Soleiman Amiri
- Corresponding author: Soleiman Amiri, MSc, Applied Microbiology Research Group, Academic Center for Education Culture and Research, (ACECR), Tehran Branch, Tehran, Iran.
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Scagliola M, Pii Y, Mimmo T, Cesco S, Ricciuti P, Crecchio C. Characterization of plant growth promoting traits of bacterial isolates from the rhizosphere of barley (Hordeum vulgare L.) and tomato (Solanum lycopersicon L.) grown under Fe sufficiency and deficiency. Plant Physiol Biochem 2016; 107:187-196. [PMID: 27295343 DOI: 10.1016/j.plaphy.2016.06.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 05/18/2023]
Abstract
Plant Growth Promoting Bacteria (PGPB) are considered a promising approach to replace the conventional agricultural practices, since they have been shown to affect plant nutrient-acquisition processes by influencing nutrient availability in the rhizosphere and/or those biochemical processes determining the uptake at root level of nitrogen (N), phosphorus (P), and iron (Fe), that represent the major constraints for crop productivity worldwide. We have isolated novel bacterial strains from the rhizosphere of barley (Hordeum vulgare L.) and tomato (Solanum lycopersicon L.) plants, previously grown in hydroponic solution (either Fe deficient or Fe sufficient) and subsequently transferred onto an agricultural calcareous soil. PGPB have been identified by molecular tools and characterized for their capacity to produce siderophores and indole-3-acetic acid (IAA), and to solubilize phosphate. Selected bacterial isolates, showing contemporarily high levels of the three activities investigated, were finally tested for their capacity to induce Fe reduction in cucumber roots two isolates, from barley and tomato plants under Fe deficiency, significantly increased the root Fe-chelate reductase activity; interestingly, another isolate enhanced the reduction of Fe-chelate reductase activity in cucumber plant roots, although grown under Fe sufficiency.
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Affiliation(s)
- M Scagliola
- Department of Soil, Plant and Food Sciences, University of Bari "Aldo Moro", Via Amendola 164/a, 70125 Bari, Italy
| | - Y Pii
- Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - T Mimmo
- Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - S Cesco
- Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - P Ricciuti
- Department of Soil, Plant and Food Sciences, University of Bari "Aldo Moro", Via Amendola 164/a, 70125 Bari, Italy
| | - C Crecchio
- Department of Soil, Plant and Food Sciences, University of Bari "Aldo Moro", Via Amendola 164/a, 70125 Bari, Italy.
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Ayyaz K, Zaheer A, Rasul G, Mirza MS. Isolation and identification by 16S rRNA sequence analysis of plant growth-promoting azospirilla from the rhizosphere of wheat. Braz J Microbiol 2016; 47:542-50. [PMID: 27133558 PMCID: PMC4927691 DOI: 10.1016/j.bjm.2015.11.035] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 11/24/2015] [Indexed: 11/21/2022] Open
Abstract
The main objective of the present study was to isolate phytohormone-producing, phosphate-solubilizing strains of Azospirillum from wheat to be used as inoculants for plant growth promotion. Five Azospirillum strains were isolated from the rhizosphere of field-grown wheat (Triticum aestivum L.), and it was confirmed by BOX-polymerase chain reaction (PCR) that the isolates were different and not re-isolates of the same strain. Sequence analysis of the PCR-amplified 16S rRNA gene indicated that four isolates showed maximum similarity to Azospirillum brasilense and one isolate showed maximum similarity to Azospirillum zeae. This is the first report indicating the presence of an A. zeae like isolate in the wheat rhizosphere in Pakistan. The bacterial isolates were characterized for their plant growth-promoting traits, phosphate solubilization, and indole-3-acetic acid (IAA) production. None of the isolates showed phosphate solubilization activity in the commonly used Pikovskaya medium. However, all strains (except AzoK4) exhibited ability to solubilize tricalcium phosphate (TCP) in modified Pikovskaya medium in which sucrose was replaced by Na-malate, as well as in TCP-supplemented Luria-Bertani (LB) medium. Organic acids, such as acetic, citric, lactic, malic, and succinic acids, were detected in culture supernatants of the tested Azospirillum strains. All strains exhibited ability to produce IAA in the growth medium, except Azospirillum sp. AzoK1. Among the strains tested, the maximum IAA production (30.49±1.04mgL(-1)) and phosphate solubilization (105.50±4.93mgL(-1)) were shown by a pure culture of Azospirillum sp. AzoK2. In pot experiments, single-strain inocula of Azospirillum sp. AzoK1 and AzoK2 improved wheat plant growth.
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Affiliation(s)
- Khadija Ayyaz
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Jhang Road, Faisalabad, Pakistan
| | - Ahmad Zaheer
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Jhang Road, Faisalabad, Pakistan
| | - Ghulam Rasul
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Jhang Road, Faisalabad, Pakistan
| | - Muhammad Sajjad Mirza
- National Institute for Biotechnology and Genetic Engineering (NIBGE), Jhang Road, Faisalabad, Pakistan.
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de Lacerda JRM, da Silva TF, Vollú RE, Marques JM, Seldin L. Generally recognized as safe (GRAS) Lactococcus lactis strains associated with Lippia sidoides Cham. are able to solubilize/mineralize phosphate. Springerplus 2016; 5:828. [PMID: 27386277 PMCID: PMC4917509 DOI: 10.1186/s40064-016-2596-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Accepted: 06/15/2016] [Indexed: 01/29/2023]
Abstract
Eight strains isolated from the stems of Lippia sidoides were identified as belonging to Lactococcus lactis, a bacterial species considered as "generally recognized as safe". Their capacity to solubilize/mineralize phosphate was tested in vitro with different inorganic and organic phosphorus (P) sources. All strains were able to solubilize calcium phosphate as an inorganic P source, and the best result was observed with strain 003.41 which solubilized 31 % of this P source. Rock phosphate, a mined rock containing high amounts of phosphate bearing minerals, was solubilized by five strains. When calcium phytate was the organic P source used, the majority of the strains tested showed phosphate mineralization activity. Moreover, all strains were able to solubilize/mineralize phosphate from poultry litter, a complex P source containing inorganic and predominantly organic P. The presence of genes coding for phytase and alkaline phosphatase was searched within the strains studied. However, only gene sequences related to alkaline phosphatase (phoA and phoD) could be detected in the majority of the strains (excepting strain 006.29) with identities varying from 67 to 88 %. These results demonstrate for the first time the potential of L. lactis strains for phosphate solubilization/mineralization activity using a broad spectrum of P sources; therefore, they are of great importance for the future development of more safe bioinoculants with possible beneficial effects for agriculture.
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Affiliation(s)
| | - Thais Freitas da Silva
- />Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ CEP 21941-590 Brazil
| | - Renata Estebanez Vollú
- />Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ CEP 21941-590 Brazil
| | - Joana Montezano Marques
- />Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ CEP 21941-590 Brazil
- />Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA CEP 66075-900 Brazil
| | - Lucy Seldin
- />Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ CEP 21941-590 Brazil
- />Laboratório de Genética Microbiana, Centro de Ciências da Saúde, Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Bloco I, Ilha do Fundão, Rio de Janeiro, RJ CEP 21941.590 Brazil
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Peña-Yam LP, Ruíz-Sánchez E, Barboza-Corona JE, Reyes-Ramírez A. Isolation of Mexican Bacillus Species and Their Effects in Promoting Growth of Chili Pepper (Capsicum annuum L. cv Jalapeño). Indian J Microbiol 2016; 56:375-8. [PMID: 27407303 DOI: 10.1007/s12088-016-0582-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/11/2016] [Indexed: 10/21/2022] Open
Abstract
The purpose of this work was to isolate and identify native bacteria from plants collected in the State of Yucatán, México with the ability to promote growth of chili pepper (Capsicum annuum L. cv Jalapeño). We identified nine bacterial isolates that belong to five species of Bacillus (i.e. Bacillus subtilis, B. flexus, B. cereus, B. megaterium and B. endophyticus) that produced indoleacetic acid (4.0-24.3 µg/mL) with solubilization index of 1.3-1.6. All the bacterial isolates were evaluated based on their ability to promote growth of chili pepper. Plants inoculated with B. subtilis ITC-N67 showed an increase in stem diameter and root volume, whereas inoculation with B. cereus ITC-BL18 increased the number of flower buds, fresh biomass of roots and total fresh biomass. Conversely, B. flexus ITC-P4 and B. flexus ITC-P22 showed deleterious effect on root volume and total biomass. In summary, our data showed that native B. cereus TC-BL18 and B. subtilis ITC-N67 have potential to be used as growth promoting microorganism for chili pepper, particularly in the state of Yucatán, México.
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Mestre MC, Fontenla S, Bruzone MC, Fernández NV, Dames J. Detection of plant growth enhancing features in psychrotolerant yeasts from Patagonia (Argentina). J Basic Microbiol 2016; 56:1098-1106. [PMID: 27106520 DOI: 10.1002/jobm.201500728] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 04/03/2016] [Indexed: 11/08/2022]
Abstract
This study explores the biotechnological potential for plant production of twelve psychrotolerant yeasts strains from Northwest-Patagonia. These strains were isolated from different substrates associated with Nothofagus sp. in native forests and Vaccinium sp. in a commercial plantation. Yeasts characterization was performed using in vitro assays to evaluate the production of auxin-like compounds and siderophores, ability to solubilize inorganic phosphate and to reduce common plant pathogen growth. Strain YF8.3 identified as Aureobasidium pullullans was the main producer of auxin-like and siderophores compounds. Phosphate solubilization was a characteristic observed by strains L8.12 and CRUB1775 identified as Holtermaniella takashimae and Candida maritima, respectively. Different yeast strains were able to inhibit the growth of Verticillium dahliae PPRI5569 and Pythium aphanidermatum PPRI 9009, but they all failed to inhibit the growth of Fusarium oxysporum PPRI5457. The present study, suggests that yeasts present in different environments in Northwestern-Patagonian have physiological in vitro features which may influence plant growth. These results are promising for the developing of biological products based on Patagonian yeasts for plant production in cold-temperate regions.
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Affiliation(s)
| | - Sonia Fontenla
- INIBIOMA (Universidad Nacional del Comahue-CONICET), Bariloche, Argentina.,Laboratorio de Microbiología Aplicada y Biotecnología, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Bariloche, Argentina
| | | | | | - Joanna Dames
- Mycorrhizal Research Laboratory, Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, South Africa
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Akbar S, Sultan S. Soil bacteria showing a potential of chlorpyrifos degradation and plant growth enhancement. Braz J Microbiol 2016; 47:563-70. [PMID: 27266625 DOI: 10.1016/j.bjm.2016.04.009] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 09/21/2015] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Since 1960s, the organophosphate pesticide chlorpyrifos has been widely used for the purpose of pest control. However, given its persistence and toxicity towards life forms, the elimination of chlorpyrifos from contaminated sites has become an urgent issue. For this process bioremediation is the method of choice. RESULTS Two bacterial strains, JCp4 and FCp1, exhibiting chlorpyrifos-degradation potential were isolated from pesticide contaminated agricultural fields. These isolates were able to degrade 84.4% and 78.6% of the initial concentration of chlorpyrifos (100mgL(-1)) within a period of only 10 days. Based on 16S rRNA sequence analysis, these strains were identified as Achromobacter xylosoxidans (JCp4) and Ochrobactrum sp. (FCp1). These strains exhibited the ability to degrade chlorpyrifos in sterilized as well as non-sterilized soils, and were able to degrade 93-100% of the input concentration (200mgkg(-1)) within 42 days. The rate of degradation in inoculated soils ranged from 4.40 to 4.76mg(-1)kg(-1)d(-1) with rate constants varying between 0.047 and 0.069d(-1). These strains also displayed substantial plant growth promoting traits such as phosphate solubilization, indole acetic acid production and ammonia production both in absence as well as in the presence of chlorpyrifos. However, presence of chlorpyrifos (100 and 200mgL(-1)) was found to have a negative effect on indole acetic acid production and phosphate solubilization with percentage reduction values ranging between 2.65-10.6% and 4.5-17.6%, respectively. Plant growth experiment demonstrated that chlorpyrifos has a negative effect on plant growth and causes a decrease in parameters such as percentage germination, plant height and biomass. Inoculation of soil with chlorpyrifos-degrading strains was found to enhance plant growth significantly in terms of plant length and weight. Moreover, it was noted that these strains degraded chlorpyrifos at an increased rate (5.69mg(-1)kg(-1)d(-1)) in planted soil. CONCLUSION The results of this study clearly demonstrate that the chlorpyrifos-degrading strains have the potential to develop into promising candidates for raising the productivity of crops in pesticide contaminated soils.
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Sarma SJ, Brar SK, LeBihan Y, Buelna G. Potential Application of Biohydrogen Production Liquid Waste as Phosphate Solubilizing Agent-A Study Using Soybean Plants. Appl Biochem Biotechnol 2016; 178:865-75. [PMID: 26541163 DOI: 10.1007/s12010-015-1914-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 10/26/2015] [Indexed: 10/22/2022]
Abstract
With CO2 free emission and a gravimetric energy density higher than gasoline, diesel, biodiesel, and bioethanol, biohydrogen is a promising green renewable energy carrier. During fermentative hydrogen production, 60-70 % of the feedstock is converted to different by-products, dominated by organic acids. In the present investigation, a simple approach for value addition of hydrogen production liquid waste (HPLW) containing these compounds has been demonstrated. In soil, organic acids produced by phosphate solubilizing bacteria chelate the cations of insoluble inorganic phosphates (e.g., Ca3 (PO4)2) and make the phosphorus available to the plants. Organic acid-rich HPLW, therefore, has been evaluated as soil phosphate solubilizer. Application of HPLW as soil phosphate solubilizer was found to improve the phosphorus uptake of soybean plants by 2.18- to 2.74-folds. Additionally, 33-100 % increase in seed germination rate was also observed. Therefore, HPLW has the potential to be an alternative for phosphate solubilizing biofertilizers available in the market. Moreover, the strategy can be useful for phytoremediation of phosphorus-rich soil.
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Affiliation(s)
- Saurabh Jyoti Sarma
- Institut National de la Recherche Scientifique (INRS), Centre Eau, Terre & Environnement (ETE), 490, Rue de la Couronne, Québec, QC, G1K 9A9, Canada
| | - Satinder Kaur Brar
- Institut National de la Recherche Scientifique (INRS), Centre Eau, Terre & Environnement (ETE), 490, Rue de la Couronne, Québec, QC, G1K 9A9, Canada.
| | - Yann LeBihan
- Centre de Recherche Industrielle du Québec (CRIQ), Québec, QC, G1P 4C7, Canada
| | - Gerardo Buelna
- Centre de Recherche Industrielle du Québec (CRIQ), Québec, QC, G1P 4C7, Canada
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Agrawal T, Kotasthane AS, Kushwah R. Genotypic and phenotypic diversity of polyhydroxybutyrate (PHB) producing Pseudomonas putida isolates of Chhattisgarh region and assessment of its phosphate solubilizing ability. 3 Biotech 2015; 5:45-60. [PMID: 28324359 PMCID: PMC4327755 DOI: 10.1007/s13205-014-0198-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 01/30/2014] [Indexed: 11/06/2022] Open
Abstract
A diverse and versatile spectrum of metabolic activities among isolates of fluorescent Pseudomonas putida indicates their adaptability to various niches. These polyhydroxybutyrate producing and phosphate solubilizing isolates showed a high level of functional and genetic versatility among themselves. One of the potential P. putida isolate P132 can contribute as a candidate agent for both biocontrol and PGPR applications. Identified as one of the most efficient PHB producer and phosphate solubilizer, in vitro detection of P132 showed the presence of genes for phenazine, pyrrolnitrin, pyoluteorin and 2,4 diacetylphloroglucinol along with polyhydroxyalkanoate.
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Affiliation(s)
- Toshy Agrawal
- Department of Plant Molecular Biology & Biotechnology, Indira Gandhi Krishi Vishwavidyalaya, Krishak Nagar, Raipur, 492006, Chattisgarh, India.
| | - Anil S Kotasthane
- Department of Plant Molecular Biology & Biotechnology, Indira Gandhi Krishi Vishwavidyalaya, Krishak Nagar, Raipur, 492006, Chattisgarh, India
- Department of Plant Pathology, Indira Gandhi Krishi Vishwavidyalaya, Krishak Nagar, Raipur, 492006, Chattisgarh, India
| | - Renu Kushwah
- Department of Plant Molecular Biology & Biotechnology, Indira Gandhi Krishi Vishwavidyalaya, Krishak Nagar, Raipur, 492006, Chattisgarh, India
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Kang SM, Radhakrishnan R, You YH, Joo GJ, Lee IJ, Lee KE, Kim JH. Phosphate Solubilizing Bacillus megaterium mj1212 Regulates Endogenous Plant Carbohydrates and Amino Acids Contents to Promote Mustard Plant Growth. Indian J Microbiol 2014; 54:427-33. [PMID: 25320441 DOI: 10.1007/s12088-014-0476-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 05/21/2014] [Indexed: 11/28/2022] Open
Abstract
The current study was conducted to explore the potential of a phosphate solubilizing soil bacterium, Bacillus megaterium mj1212 for enhancing the growth of mustard plants. The newly isolated bacterial strain mj1212 was identified as B. megaterium using phylogenetic analysis and, its phosphate solubilization ability was shown by the clear zone formation on National Botanical Research Institute's Phosphate medium. Moreover, the phosphate solubilization ability of B. megaterium mj1212 was enhanced by optimal culture conditions at pH 7.0 and 35 °C which might be due to the presence of malic and quinic acid in the culture medium. The beneficial effect of B. megaterium mj1212 in mustard plants was determined by an increasing shoot length, root length and fresh weight of plants. In the biochemical analysis revealed that chlorophyll, sucrose, glucose, fructose and amino acids (Asp, Thr, Ser, Glu, Gly, Ala, Cys, Val, Met, Ilu, Leu, Tyr, Phe, Lys, His, Arg and Pro) were higher in B. megaterium mj1212 treated plants, when compared to their control. The result of present study suggests that B. megaterium mj1212 treatment could be act as phosphate biofertilizer to improve the plant growth.
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Affiliation(s)
- Sang-Mo Kang
- School of Plant Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | | | - Young-Hyun You
- School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Gil-Jae Joo
- Institute of Agricultural Science and Technology, Kyungpook National University, Daegu, Republic of Korea
| | - In-Jung Lee
- School of Plant Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Ko-Eun Lee
- School of Ecology and Environmental Science, Kyungpook National University, Sangju, 741-711 Republic of Korea
| | - Jin-Ho Kim
- School of Ecology and Environmental Science, Kyungpook National University, Sangju, 741-711 Republic of Korea
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Jha Y, Subramanian RB. Characterization of root-associated bacteria from paddy and its growth-promotion efficacy. 3 Biotech 2014; 4:325-330. [PMID: 28324437 PMCID: PMC4026455 DOI: 10.1007/s13205-013-0158-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 07/19/2013] [Indexed: 11/25/2022] Open
Abstract
Bacteria from rhizosphere (Bacillus pumilus) and endorhizophere (Pseudomonas pseudoalcaligenes) of rice plant were isolated and evaluated for their effect on the growth-promotion efficiency on rice in greenhouse. Ability to solubilize phosphate, siderophore, indoleacetic acid (IAA), gibberellin production and utilization of ACC (1-aminocyclopropane-1-carboxylate) as sole nitrogen source were evaluated, which were produced in high concentration by P. pseudoalcaligenes in this present study. Inoculation of isolated microorganism resulted in the reduction of pH (from neutral to acidic) of the medium used for phosphate solubilization, and has direct relation with titratable acidity, but gluconate production showed an opposite trend. P. pseudoalcaligenes better helped the plant to overcome or suppress fungal pathogen infection by producing β-1, 3-glucanase and chitinase as well as also have enhanced dry weight, plant height, and root length. Based on these results, P. pseudoalcaligenes in this study proved a better candidature as PGPR than B. pumilus.
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Affiliation(s)
- Yachana Jha
- N. V. Patel College of Pure and Applied Sciences, Sardar Patel University, V. V. Nagar, Anand, Gujarat India
| | - R. B. Subramanian
- BRD School of Biosciences, Sardar Patel University, Post Box No. 39, V. V. Nagar, Anand, 388120 Gujarat India
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Mwajita MR, Murage H, Tani A, Kahangi EM. Evaluation of rhizosphere, rhizoplane and phyllosphere bacteria and fungi isolated from rice in Kenya for plant growth promoters. Springerplus 2013; 2:606. [PMID: 24349944 PMCID: PMC3863402 DOI: 10.1186/2193-1801-2-606] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 11/06/2013] [Indexed: 11/24/2022]
Abstract
Rice (Oryza sativa L.) is the most important staple food crop in many developing countries, and is ranked third in Kenya after maize and wheat. Continuous cropping without replenishing soil nutrients is a major problem in Kenya resulting to declining soil fertility. The use of chemical fertilizers to avert the problem of low soil fertility is currently limited due to rising costs and environmental concerns. Many soil micro-organisms are able to solubilize the unavailable phosphorus, increase uptake of nitrogen and also synthesize growth promoting hormones including auxin. The aim of this study was to isolate and characterize phyllosphere, rhizoplane and rhizosphere micro-organisms from Kenyan rice with growth promoting habits. In this study whole plant rice samples were collected from different rice growing regions of Kenya. 76.2%, over 80% and 38.5% of the bacterial isolates were positive for phosphate solubilization, nitrogenase activity and IAA production whereas 17.5% and 5% of the fungal isolates were positive for phosphate solubilization and IAA production respectively. Hence these micro-organisms have potential for utilization as bio-fertilizers in rice production.
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Affiliation(s)
| | - Hunja Murage
- />Jomo Kenyatta University of Agriculture and Technology, PO Box 62000-0020, Nairobi, Kenya
| | - Akio Tani
- />Institute of Plant Science and Resources Okayama University, 2-20-1 Chuo, Kurashiki, Okayama, 710-0046 Japan
| | - Esther M Kahangi
- />Jomo Kenyatta University of Agriculture and Technology, PO Box 62000-0020, Nairobi, Kenya
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