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Pakar NP, Rehman FU, Mehmood S, Ali S, Zainab N, Munis MFH, Chaudhary HJ. Microbial detoxification of chlorpyrifos, profenofos, monocrotophos, and dimethoate by a multifaceted rhizospheric Bacillus cereus strain PM38 and its potential for the growth promotion in cotton. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:39714-39734. [PMID: 38831144 DOI: 10.1007/s11356-024-33804-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 05/20/2024] [Indexed: 06/05/2024]
Abstract
Bacillus genera, especially among rhizobacteria, are known for their ability to promote plant growth and their effectiveness in alleviating several stress conditions. This study aimed to utilize indigenous Bacillus cereus PM38 to degrade four organophosphate pesticides (OPs) such as chlorpyrifos (CP), profenofos (PF), monocrotophos (MCP), and dimethoate (DMT) to mitigate the adverse effects of these pesticides on cotton crop growth. Strain PM38 exhibited distinct characteristics that set it apart from other Bacillus species. These include the production of extracellular enzymes, hydrogen cyanide, exopolysaccharides, Indol-3-acetic acid (166.8 μg/mL), siderophores (47.3 μg/mL), 1-aminocyclopropane-1-carboxylate deaminase activity (32.4 μg/mL), and phosphorus solubilization (162.9 μg/mL), all observed at higher concentrations. This strain has also shown tolerance to salinity (1200 mM), drought (20% PEG-6000), and copper and cadmium (1200 mg/L). The amplification of multi-stress-responsive genes, such as acdS, ituC, czcD, nifH, sfp, and pqqE, further confirmed the plant growth regulation and abiotic stress tolerance capability in strain PM38. Following the high-performance liquid chromatography (HPLC) analysis, the results showed striking compatibility with the first kinetic model. Strain PM38 efficiently degraded CP (98.4%), PF (99.7%), MCP (100%), and DMT (95.5%) at a concentration of 300 ppm over 48 h at 35 °C under optimum pH conditions, showing high coefficients of determination (R2) of 0.974, 0.967, 0.992, and 0.972, respectively. The Fourier transform infrared spectroscopy (FTIR) analysis and the presence of opd, mpd, and opdA genes in the strain PM38 further supported the potential to degrade OPs. In addition, inoculating cotton seedlings with PM38 improved root length under stressful conditions. Inoculation of strain PM38 reduces stress by minimizing proline, thiobarbituric acid-reactive compounds, and electrolyte leakage. The strain PM38 has the potential to be a good multi-stress-tolerant option for a biological pest control agent capable of improving global food security and managing contaminated sites.
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Affiliation(s)
- Najeeba Parre Pakar
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan
- Department of Biology, University of York, Wentworth Way, York, YO10 5DD, UK
| | - Fazal Ur Rehman
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan
- New Town Research Laboratories, Tasmanian Institute of Agriculture, University of Tasmania, New Town, Hobart, TAS, Australia
| | - Shehzad Mehmood
- Department of Biotechnology, COMSATS University Islamabad, Vehari Campus, Vehari, 61100, Pakistan
| | - Sarfaraz Ali
- Department of Virology, National Institute of Health, Islamabad, Pakistan
| | - Nida Zainab
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan
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Jensen CNG, Pang JKY, Gottardi M, Kračun SK, Svendsen BA, Nielsen KF, Kovács ÁT, Moelbak L, Fimognari L, Husted S, Schulz A. Bacillus subtilis promotes plant phosphorus (P) acquisition through P solubilization and stimulation of root and root hair growth. PHYSIOLOGIA PLANTARUM 2024; 176:e14338. [PMID: 38740528 DOI: 10.1111/ppl.14338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 04/03/2024] [Accepted: 04/12/2024] [Indexed: 05/16/2024]
Abstract
Bacteria can be applied as biofertilizers to improve crop growth in phosphorus (P)-limited conditions. However, their mode of action in a soil environment is still elusive. We used the strain ALC_02 as a case study to elucidate how Bacillus subtilis affects dwarf tomato cultivated in soil-filled rhizoboxes over time. ALC_02 improved plant P acquisition by increasing the size and P content of P-limited plants. We assessed three possible mechanisms, namely root growth stimulation, root hair elongation, and solubilization of soil P. ALC_02 produced auxin, and inoculation with ALC_02 promoted root growth. ALC_02 promoted root hair elongation as the earliest observed response and colonized root hairs specifically. Root and root hair growth stimulation was associated with a subsequent increase in plant P content, indicating that a better soil exploration by the root system improved plant P acquisition. Furthermore, ALC_02 affected the plant-available P content in sterilized soil differently over time and released P from native P pools in the soil. Collectively, ALC_02 exhibited all three mechanisms in a soil environment. To our knowledge, bacterial P biofertilizers have not been reported to colonize and elongate root hairs in the soil so far, and we propose that these traits contribute to the overall effect of ALC_02. The knowledge gained in this research can be applied in the future quest for bacterial P biofertilizers, where we recommend assessing all three parameters, not only root growth and P solubilization, but also root hair elongation. This will ultimately support the development of sustainable agricultural practices.
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Affiliation(s)
- Camilla Niketa Gadomska Jensen
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
- Plant Health Innovation, Novonesis A/S, Taastrup, Denmark
| | - Janet Ka Yan Pang
- Bacterial Interactions and Evolution Group, DTU Bioengineering, Technical University of Denmark, Kgs. Lyngby, Denmark
| | | | | | | | | | - Ákos T Kovács
- Bacterial Interactions and Evolution Group, DTU Bioengineering, Technical University of Denmark, Kgs. Lyngby, Denmark
- Institute of Biology, Leiden University, Leiden, the Netherlands
| | - Lars Moelbak
- Plant Health Innovation, Novonesis A/S, Taastrup, Denmark
| | | | - Søren Husted
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Alexander Schulz
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
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Zhou X, Hu Y, Li H, Sheng J, Cheng J, Zhao T, Zhang Y. Phosphorus addition increases stability and complexity of co-occurrence network of soil microbes in an artificial Leymus chinensis grassland. Front Microbiol 2024; 15:1289022. [PMID: 38601937 PMCID: PMC11004269 DOI: 10.3389/fmicb.2024.1289022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 03/14/2024] [Indexed: 04/12/2024] Open
Abstract
Introduction Understanding the response of cross-domain co-occurrence networks of soil microorganisms to phosphorus stability and the resulting impacts is critical in ecosystems, but the underlying mechanism is unclear in artificial grassland ecosystems. Methods In this study, the effects of four phosphorus concentrations, P0 (0 kg P ha-1), P1 (15.3 kg P ha-1), P2 (30.6 kg P ha-1), and P3 (45.9 kg P ha-1), on the cross-domain co-occurrence network of bacteria and fungi were investigated in an artificial Leymus chinensis grassland in an arid region. Results and discussion The results of the present study showed that phosphorus addition significantly altered the stem number, biomass and plant height of the Leymus chinensis but had no significant effect on the soil bacterial or fungal alpha (ACE) diversity or beta diversity. The phosphorus treatments all increased the cross-domain co-occurrence network edge, node, proportion of positively correlated edges, edge density, average degree, proximity to centrality, and robustness and increased the complexity and stability of the bacterial-fungal cross-domain co-occurrence network after 3 years of continuous phosphorus addition. Among them, fungi (Ascomycota, Basidiomycota, Mortierellomycota and Glomeromycota) play important roles as keystone species in the co-occurrence network, and they are significantly associated with soil AN, AK and EC. Finally, the growth of Leymus chinensis was mainly due to the influence of the soil phosphorus content and AN. This study revealed the factors affecting the growth of Leymus chinense in artificial grasslands in arid areas and provided a theoretical basis for the construction of artificial grasslands.
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Affiliation(s)
- Xiaoguo Zhou
- College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China
- Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, China
| | - Yutong Hu
- College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China
- Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, China
| | - Huijun Li
- College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China
- The Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jiandong Sheng
- College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China
- Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, China
| | - Junhui Cheng
- College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China
- Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, China
| | - Tingting Zhao
- College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China
- Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, China
| | - Yuanmei Zhang
- College of Forestry and Landscape Architecture, Xinjiang Agricultural University, Urumqi, China
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Kulkova I, Wróbel B, Dobrzyński J. Serratia spp. as plant growth-promoting bacteria alleviating salinity, drought, and nutrient imbalance stresses. Front Microbiol 2024; 15:1342331. [PMID: 38562478 PMCID: PMC10982427 DOI: 10.3389/fmicb.2024.1342331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 03/04/2024] [Indexed: 04/04/2024] Open
Abstract
In agricultural environments, plants are often exposed to abiotic stresses including temperature extremes, salt stress, drought, and heavy metal soil contamination, which leads to significant economic losses worldwide. Especially salt stress and drought pose serious challenges since they induce ionic toxicity, osmotic stress, and oxidative stress in plants. A potential solution can be the application of bacteria of the Serratia spp. known to promote plant growth under normal conditions Thus the mini-review aims to summarize the current knowledge on plant growth promotion by Serratia spp. (under the conditions of salinity stress, drought, and nutrient deficit) and highlight areas for development in the field. So far, it has been proven that Serratia spp. strains exhibit a variety of traits contributing to enhanced plant growth and stress tolerance, such as phytohormone production, ACC deaminase activity, nitrogen fixation, P and Zn solubilization, antioxidant properties improvement, and modulation of gene expression. Nevertheless, further research on Serratia spp. is needed, especially on two subjects: elucidating its mechanisms of action on plants at the molecular level and the effects of Serratia spp. on the indigenous soil and plant microbiota and, particularly, the rhizosphere. In both cases, it is advisable to use omics techniques to gain in-depth insights into the issues. Additionally, some strains of Serratia spp. may be phytopathogens, therefore studies to rule out this possibility are recommended prior to field trials. It is believed that by improving said knowledge the potential of Serratia spp. to stimulate plant growth will increase and strains from the genus will serve as an eco-friendly biofertilizer in sustainable agriculture more often.
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Affiliation(s)
- Iryna Kulkova
- Institute of Technology and Life Science – National Research Institute, Raszyn, Poland
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Wang Y, Yang Y, Zhao D, Li Z, Sui X, Zhang H, Liu J, Li Y, Zhang CS, Zheng Y. Ensifer sp. GMS14 enhances soybean salt tolerance for potential application in saline soil reclamation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 349:119488. [PMID: 37939476 DOI: 10.1016/j.jenvman.2023.119488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/10/2023] [Accepted: 10/26/2023] [Indexed: 11/10/2023]
Abstract
Rhizosphere microbiomes play an important role in enhancing plant salt tolerance and are also commonly employed as bio-inoculants in soil remediation processes. Cultivated soybean (Glycine max) is one of the major oilseed crops with moderate salt tolerance. However, the response of rhizosphere microbes me to salt stress in soybean, as well as their potential application in saline soil reclamation, has been rarely reported. In this study, we first investigated the microbial communities of salt-treated and non-salt-treated soybean by 16S rRNA gene amplicon sequencing. Then, the potential mechanism of rhizosphere microbes in enhancing the salt tolerance of soybean was explored based on physiological analyses and transcriptomic sequencing. Our results suggested that Ensifer and Novosphingobium were biomarkers in salt-stressed soybean. One corresponding strain, Ensifer sp. GMS14, showed remarkable growth promoting characteristics. Pot experiments showed that GMS14 significantly improved the growth performance of soybean in saline soils. Strain GMS14 alleviated sodium ions (Na+) toxicity by maintaining low a Na+/K+ ratio and promoted nitrogen (N) and phosphorus (P) uptake by soybean in nutrient-deficient saline soils. Transcriptome analyses indicated that GMS14 improved plant salt tolerance mainly by ameliorating salt stress-mediated oxidative stress. Interestingly, GMS14 was evidenced to specifically suppress hydrogen peroxide (H2O2) production to maintain reactive oxygen species (ROS) homeostasis in plants under salt stress. Field experiments with GMS14 applications showed its great potential in saline soil reclamation, as evidenced by the increased biomass and nodulation capacity of GMS14-inoculated soybean. Overall, our findings provided valuable insights into the mechanisms underlying plant-microbes interactions, and highlighted the importance of microorganisms recruited by salt-stressed plant in the saline soil reclamation.
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Affiliation(s)
- Youqiang Wang
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying, 257300, China
| | - Yanzhe Yang
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Donglin Zhao
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying, 257300, China
| | - Zhe Li
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Xiaona Sui
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Han Zhang
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Jin Liu
- Shandong Baiwo Bio-technology Co., Ltd., Linyi, 273423, China
| | - Yiqiang Li
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying, 257300, China
| | - Cheng-Sheng Zhang
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying, 257300, China.
| | - Yanfen Zheng
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying, 257300, China.
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Ajibade OA, Oladipo EK, Kwenda S, Khumalo Z, Ismail A, Oloke JK, Oyawoye OM, Onyeaka H. Whole genomic sequence of Enterobacter sichuanensis AJI 2411 - A plant growth promoting rhizobacteria. Gene 2023; 887:147725. [PMID: 37625562 DOI: 10.1016/j.gene.2023.147725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 08/14/2023] [Accepted: 08/21/2023] [Indexed: 08/27/2023]
Abstract
Enterobacter sichuanensis AJI 2411 is a rhizobacteria displaying plant growth promoting potentials, which was isolated from the rhizosphere of soybeans in Ede, Osun State, Nigeria. The full genome of Enterobacter sichuanensis AJI 2411 was sequenced and reported in this study to shed light on the molecular mechanisms that aids the bacteria's plant growth-promoting abilities.
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Affiliation(s)
- Oluwatosin Akinola Ajibade
- Department of Microbiology, Laboratory of Industrial Microbiology, Adeleke University, Ede, Osun State, Nigeria; Genomics Unit, Helix Biogen Institute, Ogbomoso, Oyo State, Nigeria.
| | - Elijah Kolawole Oladipo
- Department of Microbiology, Laboratory of Industrial Microbiology, Adeleke University, Ede, Osun State, Nigeria; Genomics Unit, Helix Biogen Institute, Ogbomoso, Oyo State, Nigeria.
| | - Stanford Kwenda
- Sequencing Core Facility, National Institute for Communicable Diseases, National Health Laboratory Service, 1 Modderfontein Road, Sandringham, Johannesburg, Gauteng, South Africa
| | - Zamantungwa Khumalo
- Sequencing Core Facility, National Institute for Communicable Diseases, National Health Laboratory Service, 1 Modderfontein Road, Sandringham, Johannesburg, Gauteng, South Africa; Veterinary Tropical Diseases Department, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort 0110, South Africa
| | - Arshad Ismail
- Sequencing Core Facility, National Institute for Communicable Diseases, National Health Laboratory Service, 1 Modderfontein Road, Sandringham, Johannesburg, Gauteng, South Africa
| | - Julius Kola Oloke
- Genomics Unit, Helix Biogen Institute, Ogbomoso, Oyo State, Nigeria; Precious Cornerstone University, Off Old Ife Road, Agodi, Ibadan, Oyo State, Nigeria.
| | - Olubukola Monisola Oyawoye
- Department of Microbiology, Laboratory of Industrial Microbiology, Adeleke University, Ede, Osun State, Nigeria; Genomics Unit, Helix Biogen Institute, Ogbomoso, Oyo State, Nigeria.
| | - Helen Onyeaka
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
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Shahid M, Khan MS, Singh UB. Pesticide-tolerant microbial consortia: Potential candidates for remediation/clean-up of pesticide-contaminated agricultural soil. ENVIRONMENTAL RESEARCH 2023; 236:116724. [PMID: 37500042 DOI: 10.1016/j.envres.2023.116724] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 07/16/2023] [Accepted: 07/21/2023] [Indexed: 07/29/2023]
Abstract
Reclamation of pesticide-polluted lands has long been a difficult endeavour. The use of synthetic pesticides could not be restricted due to rising agricultural demand. Pesticide toxicity has become a pressing agronomic problem due to its adverse impact on agroecosystems, agricultural output, and consequently food security and safety. Among different techniques used for the reclamation of pesticide-polluted sites, microbial bioremediation is an eco-friendly approach, which focuses on the application of resilient plant growth promoting rhizobacteria (PGPR) that may transform or degrade chemical pesticides to innocuous forms. Such pesticide-resilient PGPR has demonstrated favourable effects on soil-plant systems, even in pesticide-contaminated environments, by degrading pesticides, providing macro-and micronutrients, and secreting active but variable secondary metabolites like-phytohormones, siderophores, ACC deaminase, etc. This review critically aims to advance mechanistic understanding related to the reduction of phytotoxicity of pesticides via the use of microbe-mediated remediation techniques leading to crop optimization in pesticide-stressed soils. The literature surveyed and data presented herein are extremely useful, offering agronomists-and crop protectionists microbes-assisted remedial strategies for affordably enhancing crop productivity in pesticide-stressed soils.
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Affiliation(s)
- Mohammad Shahid
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Kushmaur, Mau Nath Bhanjan, 275103, UP, India; Department of Agricultural Microbiology, Faculty of Agriculture Science, Aligarh Muslim University (A.M.U.), Aligarh, 202001, UP, India.
| | - Mohammad Saghir Khan
- Department of Agricultural Microbiology, Faculty of Agriculture Science, Aligarh Muslim University (A.M.U.), Aligarh, 202001, UP, India
| | - Udai B Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Kushmaur, Mau Nath Bhanjan, 275103, UP, India
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Maldani M, Aliyat FZ, Morabito M, Giarratana F, Nassiri L, Ibijbijen J. The effects of herbicide application on two soil phosphate solubilizing bacteria: Pantoea agglomerans and Serratia rubidaea. ECOTOXICOLOGY (LONDON, ENGLAND) 2023; 32:720-735. [PMID: 37407783 DOI: 10.1007/s10646-023-02681-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/23/2023] [Indexed: 07/07/2023]
Abstract
The application of synthetic pesticides is one of the fastest acting tools at farmers' disposal to prevent and mitigate the threats posed by plant pests in agriculture. However, the effects of these above-ground applications of pesticides are known to be detrimental to some belowground, non-target soil biota. At present, the effects many pesticides have on key functional microbial groups associated with phosphate (P) solubilization in the soil are still largely unknown. The purpose of this study was to compare the effects of two herbicides, glyphosate, and paraquat, on phosphate solubilizing bacteria (PSB) with and without pH adjustment (after herbicide addition) since pH is a major indicator of P solubilization. In our assay, two PSB strains (Pantoea agglomerans and Serratia rubidaea) were chosen to assess their ability to solubilize tricalcium phosphate (TCP) by using the vanadate-molybdate method (to measure the amount of P solubilized) in the presence of glyphosate (5.4 g/L and 10.8 g/L) or paraquat (2 g/L and 4 g/L) separately. To assess the effect of PSB treated by the herbicides, a growth experiment using PSB inoculated wheat seedlings was performed under greenhouse conditions (25 °C, light 16 h/8 h dark). After four weeks, wheat above-ground growth parameters were measured. Our results showed that even under recommended doses of glyphosate (5.4 g/L) and paraquat (2 g/L), a decrease in P solubilization activity was observed in P. agglomerans and S. rubidaea. Whilst paraquat affected TCP solubilization more than glyphosate with and without pH adjustment, there was a significant decrease (p < 0.05) in TCP solubilization, up to 39% and 93% in the presence of glyphosate and paraquat, respectively, for S. rubidaea, and up to 45% and 95% in the presence of glyphosate and paraquat, respectively, for P. agglomerans. The effect of the herbicides on the PSB had the same results as in the greenhouse test on wheat seedling growth, confirming that these herbicides have both above and belowground negative effects, despite being used at recommended doses.
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Affiliation(s)
- Mohamed Maldani
- Department of Biological & Forensic Sciences, Fayetteville State University, 1200 Murchison Road, Fayetteville, NC, 28301, USA.
- Environment and Valorization of Microbial and Plant Resources Unit, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco.
| | - Fatima Zahra Aliyat
- Environment and Valorization of Microbial and Plant Resources Unit, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
| | - Marina Morabito
- Department of Chemical, Biological, Pharmaceutical, and Environmental Sciences, University of Messina, Messina, Italy
| | - Filippo Giarratana
- Department of Veterinary Science, University of Messina, Polo Universitario dell' Annunziata, Messina, Italy
| | - Laila Nassiri
- Environment and Valorization of Microbial and Plant Resources Unit, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
| | - Jamal Ibijbijen
- Environment and Valorization of Microbial and Plant Resources Unit, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
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Landa-Acuña D, Toro M, Santos-Mendoza R, Zúñiga-Dávila D. Role of Rahnella aquatilis AZO16M2 in Phosphate Solubilization and Ex Vitro Acclimatization of Musa acuminata var. Valery. Microorganisms 2023; 11:1596. [PMID: 37375098 PMCID: PMC10301868 DOI: 10.3390/microorganisms11061596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 06/04/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Rahnella aquatilis AZO16M2, was characterized for its phosphate solubilization capacity to improve the establishment and survival of Musa acuminata var. Valery seedlings under ex-acclimation. Three phosphorus sources (Rock Phosphate (RF), Ca3(PO4)2 and K2HPO4) and two types of substrate (sand:vermiculite (1:1) and Premix N°8) were selected. The factorial analysis of variance (p < 0.05) showed that R. aquatilis AZO16M2 (OQ256130) solubilizes Ca3(PO4)2 in solid medium, with a Solubilization Index (SI) of 3.77 at 28 °C (pH 6.8). In liquid medium, it was observed that R. aquatilis produced 29.6 mg/L soluble P (pH 4.4), and synthesized organic acids (oxalic, D-gluconic, 2-ketogluconic and malic), Indole Acetic Acid (IAA) (33.90 ppm) and siderophores (+). Additionally, acid and alkaline phosphatases (2.59 and 2.56 µg pNP/mL/min) were detected. The presence of the pyrroloquinoline-quinone (PQQ) cofactor gene was confirmed. After inoculating AZO16M2 to M. acuminata in sand:vermiculite with RF, the chlorophyll content was 42.38 SPAD (Soil Plant Analysis Development). Aerial fresh weight (AFW), aerial dry weight (ADW) and root dry weight (RDW) were superior to the control by 64.15%, 60.53% and 43.48%, respectively. In Premix N°8 with RF and R. aquatilis, 8.91% longer roots were obtained, with 35.58% and 18.76% more AFW and RFW compared with the control as well as 94.45 SPAD. With Ca3(PO4)2, values exceeded the control by 14.15% RFW, with 45.45 SPAD. Rahnella aquatilis AZO16M2 favored the ex-climatization of M. acuminata through improving seedling establishment and survival.
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Affiliation(s)
- Daniela Landa-Acuña
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
| | - Marcia Toro
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
- Centro de Ecología Aplicada, Instituto de Zoología y Ecología Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas 1041-A, Venezuela
| | - Ricardo Santos-Mendoza
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
| | - Doris Zúñiga-Dávila
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
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10
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Paker NP, Mehmood S, Javed MT, Damalas CA, Rehman FU, Chaudhary HJ, Munir MZ, Malik M. Elucidating molecular characterization of chlorpyrifos and profenofos degrading distinct bacterial strains for enhancing seed germination potential of Gossypium arboreum L. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:48120-48137. [PMID: 36752920 DOI: 10.1007/s11356-023-25343-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 01/10/2023] [Indexed: 06/18/2023]
Abstract
Chlorpyrifos (CP) and profenofos (PF) are organophosphate pesticides (OPs) widely used in agriculture and are noxious to both fauna and flora. The presented work was designed to attenuate the toxicity of both pesticides in the growth parameters of a cotton crop by applying plant growth-promoting rhizobacteria (PGPR), namely Pseudomonas aeruginosa PM36 and Bacillus sp. PM37. The multifarious biological activities of both strains include plant growth-promoting traits, including phosphate solubilization; indole-3-acetic acid (IAA), siderophore, and HCN production; nitrogen fixation; and enzymatic activity such as cellulase, protease, amylase, and catalase. Furthermore, the molecular profiling of multi-stress-responsive genes, including acdS, ituC, czcD, nifH, and sfp, also confirmed the plant growth regulation and abiotic stress tolerance potential of PM36 and PM37. Both strains (PM36 and PM37) revealed 92% and 89% of CP degradation at 50 ppm and 87% and 81% at 150 ppm within 7 days. Simultaneously 94% and 98% PF degradation was observed at 50 ppm and 90% and 92% at 150 ppm within 7 days at 35 °C and pH 7. Biodegradation was analyzed using HPLC and FTIR. The strains exhibited first-order reaction kinetics, indicating their reliance on CP and PF as energy and carbon sources. The presence of opd, mpd, and opdA genes in both strains also supported the CP and PF degradation potential of both strains. Inoculation of strains under normal and OP stress conditions resulted in a significant increase in seed germination, plant biomass, and chlorophyll contents of the cotton seedling. Our findings indicate that the strains PM36 and PM37 have abilities as biodegraders and plant growth promoters, with potential applications in crop sciences and bioremediation studies. These strains could serve as an environmentally friendly, sustainable, and socially acceptable solution to manage OP-contaminated sites.
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Affiliation(s)
- Najeeba Paree Paker
- Department of Plant Sciences, Faculty of Biological Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan
| | - Shehzad Mehmood
- Department of Plant Sciences, Faculty of Biological Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan
- Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Vehari, 61100, Pakistan
| | | | - Christos A Damalas
- Department of Agricultural Development, Democritus University of Thrace, Orestiada, Greece
| | - Fazal Ur Rehman
- Department of Plant Sciences, Faculty of Biological Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan
| | - Hassan Javed Chaudhary
- Department of Plant Sciences, Faculty of Biological Sciences, Quaid-I-Azam University, Islamabad, 45320, Pakistan.
| | - Muhammad Zeshan Munir
- Schools of Environment and Energy, Peking University Shenzhen Graduate School, 2199 Lishui Rd, Shenzhen, 518055, China
| | - Mahrukh Malik
- Drug Control and Traditional Medicines Division, National Institute of Health, Islamabad, Pakistan
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11
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Jiang Z, Shao Q, Chu Y, An N, Cao B, Ren Z, Li J, Qu J, Dong M, Zhang Y. Mitigation of atrazine-induced oxidative stress on soybean seedlings after co-inoculation with atrazine-degrading bacterium Arthrobacter sp. DNS10 and inorganic phosphorus-solubilizing bacterium Enterobacter sp. P1. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:30048-30061. [PMID: 36418831 DOI: 10.1007/s11356-022-24070-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
Atrazine toxicity is one of the limiting factors inhibiting sensitive plant growth. Previous studies showed that atrazine-degrading bacteria could alleviate atrazine toxicity. However, there is limited information on how atrazine-degrading bacteria and plant growth-promote bacteria alleviate atrazine toxicity in soybeans. Therefore, the current study aimed to explore the atrazine removal, phosphorus utilization, and the oxidative stress alleviation of atrazine-degrading bacterium Arthrobacter sp. DNS10 and/or inorganic phosphorus-solubilizing bacterium Enterobacter sp. P1 in the reduction of atrazine toxicity in soybean. The results showed that atrazine exposure to soybean seedlings led to significant inhibition in growth, atrazine removal, and phosphorus utilization. However, the co-inoculatied strains significantly increased seedlings biomass, chlorophyll a/b contents, and total phosphorus in leaves accompanied by great reduction of the atrazine-induced antioxidant enzymes activities and malonaldehyde (MDA) contents, as well as atrazine contents in soil and soybeans under atrazine stress. Furthermore, transcriptome analysis highlighted that co-inoculated strains increased the expression levels of genes related to photosynthetic-antenna proteins, carbohydrate metabolism, and fatty acid degradation in leaves. All the results suggest that the co-inoculation mitigates atrazine-induced oxidative stress on soybean by accelerating atrazine removal from soil and phosphorus accumulation in leaves, enhancing the chlorophyll contents, and regulating plant transcriptome. It may be suggested that co-inoculation of atrazine-degrading bacteria and inorganic phosphorus-solubilizing bacteria can be used as a potential method to alleviate atrazine toxicity to the sensitive crops.
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Affiliation(s)
- Zhao Jiang
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Qi Shao
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Yuxin Chu
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Ning An
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Bo Cao
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Zheyi Ren
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Jin Li
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Jianhua Qu
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Maofeng Dong
- Pesticide Safety Evaluation Research Center, Shanghai Academy of Agricultural Sciences, Shanghai, 201106, People's Republic of China
| | - Ying Zhang
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, People's Republic of China.
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130132, People's Republic of China.
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12
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Anzuay MS, Prenollio A, Ludueña LM, Morla FD, Cerliani C, Lucero C, Angelini JG, Taurian T. Enterobacter sp. J49: A Native Plant Growth-Promoting Bacteria as Alternative to the Application of Chemical Fertilizers on Peanut and Maize Crops. Curr Microbiol 2023; 80:85. [PMID: 36701020 DOI: 10.1007/s00284-023-03181-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 01/03/2023] [Indexed: 01/27/2023]
Abstract
In agricultural soils the productivity is determined by several factors and among them are the metabolic activities of the microorganisms that reside in it. The inoculation of plants with these bacteria is an alternative to the use of agrochemicals in crops. In particular, in those soils in which P levels are low, phosphate-solubilizing bacteria became an important group of soil microorganisms. In order to propose a potential P-biofertilizer to replace chemical fertilizers, the objective of this study was to evaluate the response of peanut and maize plants to the inoculation with the phosphate solubilizer Enterobacter sp. J49 individually or in combination with chemical fertilizers on growth, yield, and nutrient contents on peanut and maize plants in field trials. Two field assays in the peanut growing region of Córdoba Province (Argentina) were carried out. The inoculation of peanut with Enterobacter sp. J49 showed an increase in the yield with respect to the other treatments. Maize plants inoculated with this strain, alone or combined with half dose of chemical fertilizer, presented the highest yields. The results indicated that Enterobacter sp. J49 has a growth-promoting effect on the yield of peanut and maize mainly under drought stress. In conclusion, the inoculation with this strain would be a more sustainable agricultural practice for improving yield of peanut and maize crops in Argentinian agricultural area.
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Affiliation(s)
- María Soledad Anzuay
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina.,Instituto de Investigaciones Agrobiotecnológicas (CONICET, Río Cuarto), Río Cuarto, Argentina
| | - Ariel Prenollio
- Departamento de Producción Vegetal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
| | - Liliana Mercedes Ludueña
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina.,Instituto de Investigaciones Agrobiotecnológicas (CONICET, Río Cuarto), Río Cuarto, Argentina
| | - Federico Daniel Morla
- Departamento de Producción Vegetal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,Instituto de Investigaciones Agrobiotecnológicas (CONICET, Río Cuarto), Río Cuarto, Argentina
| | - Cecilia Cerliani
- Departamento de Producción Vegetal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
| | - Cinthia Lucero
- Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Ruta Nacional 35 km 330, 6300, Santa Rosa, La Pampa, Argentina
| | - Jorge Guillermo Angelini
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina.,Instituto de Investigaciones Agrobiotecnológicas (CONICET, Río Cuarto), Río Cuarto, Argentina
| | - Tania Taurian
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina. .,Instituto de Investigaciones Agrobiotecnológicas (CONICET, Río Cuarto), Río Cuarto, Argentina.
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13
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Sanchez-Gonzalez ME, Mora-Herrera ME, Wong-Villarreal A, De La Portilla-López N, Sanchez-Paz L, Lugo J, Vaca-Paulín R, Del Aguila P, Yañez-Ocampo G. Effect of pH and Carbon Source on Phosphate Solubilization by Bacterial Strains in Pikovskaya Medium. Microorganisms 2022; 11:microorganisms11010049. [PMID: 36677341 PMCID: PMC9866999 DOI: 10.3390/microorganisms11010049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 12/13/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
Phosphate-solubilizing bacteria (PSB) transform precipitated inorganic phosphorus into soluble orthophosphates. This study evaluated the efficiency of tricalcium and iron phosphate solubilization in Pikovskaya medium using five bacterial strains (A1, A2, A3, A5, and A6) cultured in acidic and alkaline pH levels. The bacterial strain that proved to be more efficient for P solubilization and was tolerant to pH variations was selected for assessing bacterial growth and P solubilization with glucose and sucrose in the culture medium. The bacterial strains were identified through 16S rRNA gene sequencing as Pseudomonas libanensis A1, Pseudomonas libanensis (A2), Bacillus pumilus (A3), Pseudomonas libanensis (A5), and Bacillus siamensis (A6). These five bacterial strains grew, tolerated pH changes, and solubilized inorganic phosphorus. The bacterial strain A3 solubilized FePO4 (4 mg L-1) and Ca3(PO4)2 (50 mg L-1). P solubilization was assayed with glucose and sucrose as carbon sources for A3 (Bacillus pumilus MN100586). After four culture days, Ca3(PO4)2 was solubilized, reaching 246 mg L-1 with sucrose in culture media. Using glucose as a carbon source, FePO4 was solubilized and reached 282 mg L-1 in six culture days. Our findings were: Pseudomonas libanensis, and Bacillus siamensis, as new bacteria, can be reported as P solubilizers with tolerance to acidic or alkaline pH levels. The bacterial strain B. pumilus grew using two sources of inorganic phosphorus and carbon, and it tolerated pH changes. For that reason, it is an ideal candidate for inorganic phosphorus solubilization and future production as a biofertilizer.
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Affiliation(s)
- Ma. Esther Sanchez-Gonzalez
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | - Martha E. Mora-Herrera
- Tenancingo Universitary Center, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | | | - Nadia De La Portilla-López
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | - Laura Sanchez-Paz
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | - Jorge Lugo
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | - Rocio Vaca-Paulín
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | - Pedro Del Aguila
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
| | - Gustavo Yañez-Ocampo
- Laboratory of Edaphology and Environment, Faculty of Sciences, Autonomous University of the State of Mexico, Toluca 50000, Mexico
- Correspondence: ; Tel.: +52-722-2262-300
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14
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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] [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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15
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Obelenwa UC, Ugwuanyi JO. Development of Bacteria biofertilizers using locally isolated rhizosphere populations and agricultural refuse and their impacts on growth of local test crops. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2022; 25:1248-1258. [PMID: 36382650 DOI: 10.1080/15226514.2022.2145265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Biofertilizers are the preparations of live microorganisms added to the root, seed or soil to promote plant growth. In this study, Plant Growth Promoting Bacteria able to solubilize insoluble phosphate (P) and potassium (K) forms were isolated, characterized and identified. Two isolates that demonstrated excellent solubilization of potassium or phosphate from abundant and bio-available waste biomass (rice husk and cattle bone) were used to produce biofertilizers by solid-state fermentation. The biofertilizers were applied to grow three food security crops, Zea mays, Solanum lycopersicum, and Arachis hypogea, in a screenhouse, and monitored for growth impacts. Treatments A, B, and A + B biofertilizers caused a significant (p < 0.05) increase in plant dry weights. The highest microbial colonization was obtained from treatment A + B (for S. lycopersicum) with a microbial count (log 2.89 (108) cfu/g), whereas treatment with B (for A. hypogea) had the least microbial count (log 2.73 (108) cfu/g). Maximum values of experimental parameters: shoot height, leaf number, plant dry weight and leaf width were obtained with the combined application of both biofertilizers. P and K solubilizing PGPB have shown potential for use as biofertilizers in growing these key crops under the soil conditions and in the environment studied.
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Affiliation(s)
- Ursula Chidimma Obelenwa
- Department of Microbiology, Alex Ekwueme Federal University Ndufu-Alike, Ikwo, Ebonyi State, Nigeria
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16
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Sachman-Ruíz B, Wong-Villarreal A, Aguilar-Marcelino L, Lozano-Aguirre LF, Espinosa-Zaragoza S, Reyes-Reyes AL, Sanzón-Gómez D, Mireles-Arriaga AI, Romero-Tirado R, Rocha-Martínez MK, Pérez-de la Rosa JD, Sánchez-Cruz R, Gómez-Gutiérrez JA. Nematicidal, Acaricidal and Plant Growth-Promoting Activity of Enterobacter Endophytic Strains and Identification of Genes Associated with These Biological Activities in the Genomes. PLANTS (BASEL, SWITZERLAND) 2022; 11:3136. [PMID: 36432865 PMCID: PMC9695364 DOI: 10.3390/plants11223136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 10/26/2022] [Accepted: 11/05/2022] [Indexed: 06/16/2023]
Abstract
In the present study, the nematicidal and acaricidal activity of three Enterobacter endophytic strains isolated from Mimosa pudica nodules was evaluated. The percentages of mortality of Enterobacter NOD4 against Panagrellus redivivus was 81.2%, and against Nacobbus aberrans 70.1%, Enterobacter NOD8 72.4% and 62.5%, and Enterobacter NOD10 64.8% and 58.7%, respectively. While against the Tyrophagus putrescentiae mite, the mortality percentages were 68.2% due to Enterobacter NOD4, 64.3% due to Enterobacter NOD8 and 77.8% due to Enterobacter NOD10. On the other hand, the ability of the three Enterobacter strains to produce indole acetic acid and phosphate solubilization, characteristics related to plant growth-promoting bacteria, was detected. Bioinformatic analysis of the genomes showed the presence of genes related to IAA production, phosphate solubilization, and nitrogen fixation. Phylogenetic analyzes of the recA gene, phylogenomics, and average nucleotide identity (ANI) allowed us to identify the strain Enterobacter NOD8 related to E. mori and Enterobacter NOD10 as E. asburiae, while Enterobacter NOD4 was identified as a possible new species of this species. The plant growth-promoting, acaricidal and nematicidal activity of the three Enterobacter strains makes them a potential agent to include in biocontrol alternatives and as growth-promoting bacteria in crops of agricultural interest.
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Affiliation(s)
- Bernardo Sachman-Ruíz
- CENID-Salud Animal e Inocuidad, Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias, Jiutepec 62550, Mexico
| | - Arnoldo Wong-Villarreal
- División Agroalimentaria, Universidad Tecnológica de la Selva, Carretera Ocosingo-Altamirano, km 0.5, Ocosingo 29950, Mexico
| | - Liliana Aguilar-Marcelino
- National Center for Disciplinary Research in Animal Health and Safety (INIFAP), Km 11 Federal Road Cuernavaca-Cuautla, Jiutepec 62550, Mexico
| | | | - Saúl Espinosa-Zaragoza
- Facultad de Ciencias Agrícolas, Universidad Autónoma de Chiapas, Huehuetán 30660, Mexico
| | - Ana Laura Reyes-Reyes
- National Institute of Forestry Agricultural and Livestock Research (INIFAP), Campo Experimental Rosario Izapa, Tuxtla Chico 30870, Mexico
| | - Diana Sanzón-Gómez
- Departamento de Agronomía, División Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato, Irapuato 36500, Mexico
| | - Ana Isabel Mireles-Arriaga
- Departamento de Agronomía, División Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato, Irapuato 36500, Mexico
| | - Rodrigo Romero-Tirado
- Facultad de Ciencias Agrícolas, Universidad Autónoma de Chiapas, Huehuetán 30660, Mexico
| | - Marisol Karina Rocha-Martínez
- Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA), Carretera Federal Cuernavaca-Cuautla No. 8534, Colonia Progreso, Jiutepec 62550, Mexico
| | - Juan Diego Pérez-de la Rosa
- Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA), Carretera Federal Cuernavaca-Cuautla No. 8534, Colonia Progreso, Jiutepec 62550, Mexico
| | - Ricardo Sánchez-Cruz
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Cuernavaca 62209, Mexico
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17
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Chen X, Yang C, Palta JA, Li Y, Fan X. An Enterobacter cloacae strain NG-33 that can solubilize phosphate and promote maize growth. Front Microbiol 2022; 13:1047313. [PMID: 36439855 PMCID: PMC9685795 DOI: 10.3389/fmicb.2022.1047313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Accepted: 10/25/2022] [Indexed: 09/06/2023] Open
Abstract
It is critical to identify and evaluate efficient phosphate-solubilizing bacteria (PSB) that enable P uptake from unavailable forms, and therefore improve the phosphorus (P) uptake efficiency of crops. The Enterobacter cloacae strain NG-33, belonging to PSB, was isolated and identified from calcareous rhizosphere soils in Nonggang National Reserve, Guangxi, China. The stain NG-33 could reduce the pH of the medium to below 5.6, and had the ability to release soluble phosphorus (P; 180.7 μg ml-1) during the culture in the National Botanical Research Institute's Phosphate medium (NBRIP), and produced such organic acids as gluconic acid (4,881 mg L-1), acetic acid (346 mg L-1), and indole-3-acetic acid (20.4 μg ml-1). It could also convert inorganic P in AlPO4 (Al-P) and FePO4 (Fe-P) into soluble P, with conversion efficiencies of 19.2 μg ml-1 and 16.3 μg ml-1, respectively. Under pot experiments and when compared controls without inoculating NG-33, the shoot and root biomass of maize seedlings showed increases by 140% for shoot biomass and by 97% for root biomass in loamy soil (P sufficient) inoculated with NG-33. In sandy soil (P deficit) supplemented with tricalcium phosphate and inoculated with NG-33, the soluble P content was significantly higher, 58.6% in soil and 33.6% in roots, meanwhile, the biomass of shoots and roots increased by 14.9 and 24.9%, respectively. The growth-promoting effects coupled to the significant increase in leaf net photosynthetic rate and stomatal conductance of plants grown in NG-33-inoculated soil. Inoculating NG-33 could significantly improve the diversity and richness of bacterial population and altered the dominant bacterial population in soil.
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Affiliation(s)
- Xinxin Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, Guangxi, Nanning, China
| | - Caihe Yang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, Guangxi, Nanning, China
| | - Jairo A. Palta
- UWA School of Agriculture and Environment, The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
- CSIRO Agriculture and Food, Wembley, WA, Australia
| | - Youzhi Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, Guangxi, Nanning, China
| | - Xianwei Fan
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, Guangxi, Nanning, China
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18
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Pot S, Tender CD, Ommeslag S, Delcour I, Ceusters J, Vandecasteele B, Debode J, Vancampenhout K. Elucidating the microbiome of the sustainable peat replacers composts and nature management residues. Front Microbiol 2022; 13:983855. [PMID: 36246232 PMCID: PMC9555241 DOI: 10.3389/fmicb.2022.983855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 09/01/2022] [Indexed: 11/13/2022] Open
Abstract
Sustainable peat alternatives, such as composts and management residues, are considered to have beneficial microbiological characteristics compared to peat-based substrates. Studies comparing microbiological characteristics of these three types of biomass are, however, lacking. This study examined if and how microbiological characteristics of subtypes of composts and management residues differ from peat-based substrates, and how feedstock and (bio)chemical characteristics drive these characteristics. In addition, microbiome characteristics were evaluated that may contribute to plant growth and health. These characteristics include: genera associated with known beneficial or harmful microorganisms, microbial diversity, functional diversity/activity, microbial biomass, fungal to bacterial ratio and inoculation efficiency with the biocontrol fungus Trichoderma harzianum. Bacterial and fungal communities were studied using 16S rRNA and ITS2 gene metabarcoding, community-level physiological profiling (Biolog EcoPlates) and PLFA analysis. Inoculation with T. harzianum was assessed using qPCR. Samples of feedstock-based subtypes of composts and peat-based substrates showed similar microbial community compositions, while subtypes based on management residues were more variable in their microbial community composition. For management residues, a classification based on pH and hemicellulose content may be relevant for bacterial and fungal communities, respectively. Green composts, vegetable, fruit and garden composts and woody composts show the most potential to enhance plant growth or to suppress pathogens for non-acidophilic plants, while grass clippings, chopped heath and woody fractions of compost show the most potential for blends for calcifuge plants. Fungal biomass was a suitable predictor for inoculation efficiency of composts and management residues.
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Affiliation(s)
- Steffi Pot
- Division Forest, Nature and Landscape, Department of Earth and Environmental Sciences, KU Leuven, Geel, Belgium
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
- *Correspondence: Steffi Pot,
| | - Caroline De Tender
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Zwijnaarde, Belgium
| | - Sarah Ommeslag
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
| | - Ilse Delcour
- PCS Ornamental Plant Research, Destelbergen, Belgium
| | - Johan Ceusters
- Division of Crop Biotechnics, Department of Biosystems, Research Group for Sustainable Crop Production & Protection, KU Leuven, Geel, Belgium
- Centre for Environmental Sciences, Environmental Biology, UHasselt, Diepenbeek, Belgium
| | - Bart Vandecasteele
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
| | - Jane Debode
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
| | - Karen Vancampenhout
- Division Forest, Nature and Landscape, Department of Earth and Environmental Sciences, KU Leuven, Geel, Belgium
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Yue Z, Chen Y, Wang Y, Zheng L, Zhang Q, Liu Y, Hu C, Chen C, Ma K, Sun Z. Halotolerant Bacillus altitudinis WR10 improves salt tolerance in wheat via a multi-level mechanism. FRONTIERS IN PLANT SCIENCE 2022; 13:941388. [PMID: 35909740 PMCID: PMC9330482 DOI: 10.3389/fpls.2022.941388] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/27/2022] [Indexed: 06/12/2023]
Abstract
Soil salinity is an important abiotic stress factor that seriously affects the crop growth and yield. Use of plant-derived microorganisms is a promising strategy to alleviate salt stress. In a previous study, the endophytic strain Bacillus altitudinis WR10 isolated from wheat roots showed high salt resistance. In this study, we investigated the efficacy of WR10 in improving the salt tolerance of wheat and its potential mechanisms using a hydroponic test. Under salt stress, WR10 inoculation significantly increased the lengths and dry weights of the roots and shoots, indicating that WR10 improves wheat salt tolerance at the seedling stage. WR10 inoculation significantly reduced Na+ accumulation and enhanced K+, P, and Ca2+ uptake in salt-stressed plants, which can be attributed to the upregulated gene expression of H+-ATPase as well as the P-solubilizing and biofilm-producing characteristics of WR10. At the transcriptional level, L-ascorbate peroxidase (APX), glutathione (GSH) synthetase related to GSH biosynthesis, and phenylpropanoid biosynthesis genes (CYP73A, 4CL, and CAD) were significantly upregulated, whereas those of GSH metabolism genes (glutathione S-transferase and gamma-glutamyltranspeptidase) were significantly downregulated in WR10-applied wheat roots under salt stress. These changes increased the APX activity and GSH levels and resulted in a decrease in hydrogen peroxide levels. Additionally, a decrease in proline content was observed in WR10-inoculated plants under salt stress because of WR10-induced upregulation of proline dehydrogenase gene expression. These results provide supporting evidence that WR10 improves wheat salt tolerance via more than one mechanism and open a window of opportunity for WR10 application in salinized soil.
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Affiliation(s)
- Zonghao Yue
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Yanjuan Chen
- School of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou, China
| | - Yifan Wang
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Limin Zheng
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Qiaoyang Zhang
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Yongchuang Liu
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Chunhong Hu
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Can Chen
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Keshi Ma
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Zhongke Sun
- College of Biological Engineering, Henan University of Technology, Zhengzhou, China
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20
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de Oliveira EP, Marchi KE, Emiliano J, Salazar SMCH, Ferri AH, Etto RM, Reche PM, Pileggi SAV, Kalks KHM, Tótola MR, Schemczssen-Graeff Z, Pileggi M. Changes in fatty acid composition as a response to glyphosate toxicity in Pseudomonas fluorescens. Heliyon 2022; 8:e09938. [PMID: 35965982 PMCID: PMC9364109 DOI: 10.1016/j.heliyon.2022.e09938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/30/2021] [Accepted: 07/07/2022] [Indexed: 11/24/2022] Open
Abstract
Excessive use of herbicides decreases soil biodiversity and fertility. The literature on the xenobiotic response by microorganisms is focused on herbicide biodegradation as a selective event. Non-degradation systems independent of selection could allow the survival of tolerant bacteria in contaminated environments, impacting xenobiotic turnover and, consequently, bioremediation strategies. However, it is uncertain whether the response based on these systems requires selective pressure to be effective. The objective here was to analyze non-degradation phenotypes, enzymatic and structural response systems, of Pseudomonas fluorescens CMA-55 strain, already investigated the production pattern of quorum sensing molecules in response to glyphosate, not present at the isolation site. One mode of response was associated with decrease in membrane permeability and effective antioxidative response for 0–2.30 mM glyphosate, at the mid-log growing phase, with higher activities of Mn-SOD, KatA, and KatB, and presence of fatty acids as nonadecylic acid, margaric and lauric acid. The second response system was characterized by lower antioxidative enzymes activity, presence of KatC isoform, and pelargonic, capric, myristic, stearic, palmitoleic and palmitic acid as principal fatty acids, allowing the strain to face stressful conditions in 9.20–11.50 mM glyphosate at the stationary phase. Therefore, the bacterial strain could modify the fatty acid composition and the permeability of membranes in two response modes according to the herbicide concentration, even glyphosate was not previously selective for P. fluorescens, featuring a generalist system based on physiological plasticity.
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Affiliation(s)
- Elizangela Paz de Oliveira
- Department of Biotechnology, Genetics and Cell Biology, Maringá State University, Maringá, Paraná, Brazil
| | - Kathleen Evelyn Marchi
- Department of Structural and Molecular Biology and Genetics, Ponta Grossa State University, Ponta Grossa, Paraná, Brazil
| | - Janaina Emiliano
- Department of Microbiology, Londrina State University, Londrina, Paraná, Brazil
| | | | - Alisson Henrique Ferri
- Department of Structural and Molecular Biology and Genetics, Ponta Grossa State University, Ponta Grossa, Paraná, Brazil
| | - Rafael Mazer Etto
- Department of Chemistry, Ponta Grossa State University, Ponta Grossa, Paraná, Brazil
| | - Péricles Martim Reche
- Department of Nursing and Public Health, Ponta Grossa State University, Ponta Grossa, Paraná, Brazil
| | - Sônia Alvim Veiga Pileggi
- Department of Structural and Molecular Biology and Genetics, Ponta Grossa State University, Ponta Grossa, Paraná, Brazil
| | | | - Marcos Rogério Tótola
- Department of Microbiology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil
| | | | - Marcos Pileggi
- Department of Structural and Molecular Biology and Genetics, Ponta Grossa State University, Ponta Grossa, Paraná, Brazil
- Corresponding author.
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21
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Bi W, Weng B, Yan D, Wang H, Wang M, Yan S, Jing L, Liu T, Chang W. Responses of Phosphate-Solubilizing Microorganisms Mediated Phosphorus Cycling to Drought-Flood Abrupt Alternation in Summer Maize Field Soil. Front Microbiol 2022; 12:768921. [PMID: 35111138 PMCID: PMC8802831 DOI: 10.3389/fmicb.2021.768921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 12/02/2021] [Indexed: 11/13/2022] Open
Abstract
Soil microbial communities are essential to phosphorus (P) cycling, especially in the process of insoluble phosphorus solubilization for plant P uptake. Phosphate-solubilizing microorganisms (PSM) are the dominant driving forces. The PSM mediated soil P cycling is easily affected by water condition changes due to extreme hydrological events. Previous studies basically focused on the effects of droughts, floods, or drying-rewetting on P cycling, while few focused on drought-flood abrupt alternation (DFAA), especially through microbial activities. This study explored the DFAA effects on P cycling mediated by PSM and P metabolism-related genes in summer maize field soil. Field control experiments were conducted to simulate two levels of DFAA (light drought-moderate flood, moderate drought-moderate flood) during two summer maize growing periods (seeding-jointing stage, tasseling-grain filling stage). Results showed that the relative abundance of phosphate-solubilizing bacteria (PSB) and phosphate-solubilizing fungi (PSF) increased after DFAA compared to the control system (CS), and PSF has lower resistance but higher resilience to DFAA than PSB. Significant differences can be found on the genera Pseudomonas, Arthrobacter, and Penicillium, and the P metabolism-related gene K21195 under DFAA. The DFAA also led to unstable and dispersed structure of the farmland ecosystem network related to P cycling, with persistent influences until the mature stage of summer maize. This study provides references for understanding the micro process on P cycling under DFAA in topsoil, which could further guide the DFAA regulations.
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Affiliation(s)
- Wuxia Bi
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - Baisha Weng
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- Yinshanbeilu Grassland Eco-Hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Beijing, China
- *Correspondence: Baisha Weng, ,
| | - Denghua Yan
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- Yinshanbeilu Grassland Eco-Hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - Hao Wang
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - Mengke Wang
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - Siying Yan
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- College of Resource Environment and Tourism, Capital Normal University, Beijing, China
| | - Lanshu Jing
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- College of Hydrology and Water Resources, Hohai University, Nanjing, China
| | - Tiejun Liu
- Yinshanbeilu Grassland Eco-Hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Beijing, China
- Collaborative Innovation Center for Grassland Ecological Security (Jointly Supported by the Ministry of Education of China and Inner Mongolia Autonomous Region), Hohhot, China
| | - Wenjuan Chang
- College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, China
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22
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Mansotra P, Sharma P, Sirari A, Aggarwal N. Ecological performance of multifunctional pesticide tolerant strains of Mesorhizobium sp. in chickpea with recommended pendimethalin, ready-mix of pendimethalin and imazethpyr, carbendazim and chlorpyrifos application. Arch Microbiol 2022; 204:117. [PMID: 34985559 DOI: 10.1007/s00203-021-02628-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/16/2021] [Accepted: 09/30/2021] [Indexed: 11/02/2022]
Abstract
The present study was designed to screen the Mesorhizobium strains (50) for tolerance with four recommended pesticides in chickpea. In-vitro, robust pesticide tolerant strains were developed in pesticides amended media over several generations. Further, verification of the multifunctional traits of pesticide tolerant mesorhizobia under pesticide stress was conducted in-vitro. Among different pesticides, significantly high tolerance in Mesorhizobium strains was observed with recommended doses of pendimethalin (37%) and ready-mix (36%) followed by chlorpyrifos (31%) and carbendazim (30%), on an overall basis. Based on multifunctional traits, Mesorhizobium strains viz. MR2, MR17 and recommended MR33 were the most promising. Ecological performance of the potential Mesorhizobium strains alone and in dual-inoculation with recommended PGP rhizobacterium strain RB-1 (Pseudomonas argenttinensis JX239745.1) was subsequently analyzed in field following standard pesticide application in PBG-7 and GPF-2 chickpea varieties for two consecutive rabi seasons (2015 and 2016). Dual-inoculant treatments; recommended RB-1 + MR33 (4.1%) and RB-1 + MR2 (3.8%) significantly increased the grain yield over Mesorhizobium alone treatments viz MR33 and MR2, respectively. Grain yield in PBG7 variety was significantly affected (7.3%) by the microbial inoculant treatments over GPF2 variety. Therefore, the potential pesticide tolerant strains MR2 and MR33 can be further explored as compatible dual-inoculants with recommended RB-1 for chickpea under environmentally stressed conditions (pesticide application) at multiple locations. Our approach using robust multifunctional pesticide tolerant Mesorhizobium for bio-augmentation of chickpea might be helpful in the formulation of effective bio-inoculants consortia in establishing successful chickpea-Mesorhizobium symbiosis.
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Affiliation(s)
- Pallavi Mansotra
- Department of Microbiology, Punjab Agricultural University, Ludhiana, 141004, India.
| | - Poonam Sharma
- Pulses Section, Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, 141004, India
| | - Asmita Sirari
- Pulses Section, Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, 141004, India
| | - Navneet Aggarwal
- South Australia Research and Development Institute, Claire Research Centre, Clare, South Australia
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23
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Halotolerant Rhizobacteria for Salinity-Stress Mitigation: Diversity, Mechanisms and Molecular Approaches. SUSTAINABILITY 2022. [DOI: 10.3390/su14010490] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Agriculture is the best foundation for human livelihoods, and, in this respect, crop production has been forced to adopt sustainable farming practices. However, soil salinity severely affects crop growth, the degradation of soil quality, and fertility in many countries of the world. This results in the loss of profitability, the growth of agricultural yields, and the step-by-step decline of the soil nutrient content. Thus, researchers have focused on searching for halotolerant and plant growth-promoting bacteria (PGPB) to increase soil fertility and productivity. The beneficial bacteria are frequently connected with the plant rhizosphere and can alleviate plant growth under salinity stress through direct or indirect mechanisms. In this context, PGPB have attained a unique position. The responses include an increased rate of photosynthesis, high production of antioxidants, osmolyte accumulation, decreased Na+ ions, maintenance of the water balance, a high germination rate, and well-developed root and shoot elongation under salt-stress conditions. Therefore, the use of PGPB as bioformulations under salinity stress has been an emerging research avenue for the last few years, and applications of biopesticides and biofertilizers are being considered as alternative tools for sustainable agriculture, as they are ecofriendly and minimize all kinds of stresses. Halotolerant PGPB possess greater potential for use in salinity-affected soil as sustainable bioinoculants and for the bioremediation of salt-affected soil.
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24
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Mishra P, Mishra J, Arora NK. Plant growth promoting bacteria for combating salinity stress in plants - Recent developments and prospects: A review. Microbiol Res 2021; 252:126861. [PMID: 34521049 DOI: 10.1016/j.micres.2021.126861] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 09/01/2021] [Accepted: 09/02/2021] [Indexed: 01/16/2023]
Abstract
Soil salinity has emerged as a great threat to the agricultural ecosystems throughout the globe. Many continents of the globe are affected by salinity and crop productivity is severely affected. Anthropogenic activities leading to the degradation of agricultural land have also accelerated the rate of salinization in arid and semi-arid regions. Several approaches are being evaluated for remediating saline soil and restoring their productivity. Amongst these, utilization of plant growth promoting bacteria (PGPB) has been marked as a promising tool. This greener approach is suitable for simultaneous reclamation of saline soil and improving the productivity. Salt-tolerant PGPB utilize numerous mechanisms that affect physiological, biochemical, and molecular responses in plants to cope with salt stress. These mechanisms include osmotic adjustment by ion homeostasis and osmolyte accumulation, protection from free radicals by the formation of free radicals scavenging enzymes, oxidative stress responses and maintenance of growth parameters by the synthesis of phytohormones and other metabolites. As salt-tolerant PGPB elicit better plant survival under salinity, they are the potential candidates for enhancing agricultural productivity. The present review focuses on the various mechanisms used by PGPB to improve plant health under salinity. Recent developments and prospects to facilitate better understanding on the functioning of PGPB for ameliorating salt stress in plants are emphasized.
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Affiliation(s)
- Priya Mishra
- Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, 226025, India.
| | - Jitendra Mishra
- Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, 226025, India.
| | - Naveen Kumar Arora
- Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, 226025, India.
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25
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Deng Q, Zhang T, Xie D, Yang Y. Rhizosphere Microbial Communities Are Significantly Affected by Optimized Phosphorus Management in a Slope Farming System. Front Microbiol 2021; 12:739844. [PMID: 34589078 PMCID: PMC8473901 DOI: 10.3389/fmicb.2021.739844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/17/2021] [Indexed: 11/24/2022] Open
Abstract
Soil rhizosphere microorganisms play crucial roles in promoting plant nutrient absorption and maintaining soil health. However, the effects of different phosphorus (P) managements on soil microbial communities in a slope farming system are poorly understood. Here, rhizosphere microbial communities under two P fertilization levels-conventional (125 kg P2O5 ha-1, P125) and optimal (90 kg P2O5 ha-1, P90)-were compared at four growth stages of maize in a typical sloped farming system. The richness and diversity of rhizosphere bacterial communities showed significant dynamic changes throughout the growth period of maize, while different results were observed in fungal communities. However, both the P fertilization levels and the growth stages influenced the structure and composition of the maize rhizosphere microbiota. Notably, compared to P125, Pseudomonas, Conexibacter, Mycobacterium, Acidothermus, Glomeromycota, and Talaromyces were significantly enriched in the different growth stages of maize under P90, while the relative abundance of Fusarium was significantly decreased during maize harvest. Soil total nitrogen (TN) and pH are the first environmental drivers of change in bacterial and fungal community structures, respectively. The abundance of Gemmatimonadota, Proteobacteria, and Cyanobacteria showed significant correlations with soil TN, while that of Basidiomycota and Mortierellomycota was significantly related to pH. Additionally, P90 strengthened the connection between bacteria, but reduced the links between fungi at the genus level. Our work helps in understanding the role of P fertilization levels in shaping the rhizosphere microbiota and may manipulate beneficial microorganisms for better P use efficiency.
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Affiliation(s)
- Qianxin Deng
- College of Resources and Environment, Southwest University, Chongqing, China
| | - Tong Zhang
- College of Resources and Environment, Southwest University, Chongqing, China
| | - Deti Xie
- College of Resources and Environment, Southwest University, Chongqing, China
| | - Yuheng Yang
- College of Plant Protection, Southwest University, Chongqing, China
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26
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Bargaz A, Elhaissoufi W, Khourchi S, Benmrid B, Borden KA, Rchiad Z. Benefits of phosphate solubilizing bacteria on belowground crop performance for improved crop acquisition of phosphorus. Microbiol Res 2021; 252:126842. [PMID: 34438221 DOI: 10.1016/j.micres.2021.126842] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 07/31/2021] [Accepted: 08/04/2021] [Indexed: 10/20/2022]
Abstract
Although research on plant growth promoting bacteria began in the 1950s, basic and applied research on bacteria improving use of phosphorus (P) continues to be a priority among many agricultural research institutions. Ultimately, identifying agriculturally beneficial microbes, notably P solubilizing bacteria (PSB), that enhance the efficient use of P supports more sustainable cropping systems and the judicious use of mineral nutrients. In parallel, there is more attention on improving crop root P acquisition of existing soil P pools as well as by increasing the proportion of fertilizer P that is taken up by crops. Today, new lines of research are emerging to investigate the co-optimization of PSB-fertilizer-crop root processes for improved P efficiency and agricultural performance. In this review, we compile and summarize available findings on the beneficial effects of PSB on crop production with a focus on crop P acquisition via root system responses at the structural, functional and transcriptional levels. We discuss the current state of knowledge on the mechanisms of PSB-mediated P availability, both soil- and root-associated, as well as crop uptake via P solubilization, mineralization and mobilization, mainly through the production of organic acids and P-hydrolyzing enzymes, and effects on phytohormone signaling for crop root developement. The systematic changes caused by PSB on crop roots are discussed and contextualized within promising functional trait-based frameworks. We also detail agronomic profitability of P (mineral and organic) and PSB co-application, in amended soils and inoculated crops, establishing the connection between the influence of PSB on agroecosystem production and the impact of P fertilization on microbial diversity and crop functional traits for P acquisition.
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Affiliation(s)
- Adnane Bargaz
- Mohammed VI Polytechnic University, Agrobiosciences Program, Plant & Soil Microbiome Subprogram, Bengurir, 43150, Morocco.
| | - Wissal Elhaissoufi
- Mohammed VI Polytechnic University, Agrobiosciences Program, Plant & Soil Microbiome Subprogram, Bengurir, 43150, Morocco; Cadi Ayyad University, Faculty of Sciences and Techniques, Biology Dep., Marrakech, Morocco
| | - Said Khourchi
- Mohammed VI Polytechnic University, Agrobiosciences Program, Plant & Soil Microbiome Subprogram, Bengurir, 43150, Morocco; University of Liège, Gembloux Agro-Bio Tech, Liège, Belgium
| | - Bouchra Benmrid
- Mohammed VI Polytechnic University, Agrobiosciences Program, Plant & Soil Microbiome Subprogram, Bengurir, 43150, Morocco
| | - Kira A Borden
- University of British Columbia, Faculty of Land and Food Systems, Vancouver, V6T 1Z4, Canada
| | - Zineb Rchiad
- Mohammed VI Polytechnic University, Agrobiosciences Program, Plant & Soil Microbiome Subprogram, Bengurir, 43150, Morocco
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27
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Fasusi OA, Amoo AE, Babalola OO. Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa. Antonie van Leeuwenhoek 2021; 114:1683-1708. [PMID: 34387781 PMCID: PMC8448681 DOI: 10.1007/s10482-021-01633-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 07/25/2021] [Indexed: 11/30/2022]
Abstract
The region around the plant root referred to as the rhizosphere, is the zone where various microbial activity occurs. It performs crucial functions such as increasing the uptake of nutrients for plant development and preventing plant against plant pathogens. Keeping in mind the beneficial role performed by rhizospheric microorganisms, rhizobacterial species were isolated from the maize and soybean plant's rhizosphere. The isolated microorganisms were evaluated for their biochemical characteristics, plant growth-promoting potentials, tolerance to different environmental conditions, and their antifungal activity against Fusarium graminearum, a fungal pathogen that infects maize. The rhizobacterial isolates with multiple plant growth-promoting potentials were identified as Bacillus spp (80.77%), Rhodocyclaceae bacterium (3.85%), Enterococcus spp (3.85%). Massilia spp (3.85%. and Pseudomonas (7.69%) species based on their 16S rRNA molecular characterization. The bacterial isolates possessed antifungal activities against Fusarium graminearum, promote maize and soybeans seed under laboratory conditions, and exhibited different levels of tolerance to pH, temperature, salt, and heavy metal. Based on this, the whole genome sequencing of Bacillus sp. OA1, Pseudomonas rhizosphaerea OA2, and Pseudomonas sp. OA3 was performed using Miseq Illumina system to determine the functional genes and secondary metabolites responsible for their plant growth-promoting potential Thus, the result of this research revealed that the selected bacterial isolates possess plant growth-promoting potentials that can make them a potential candidate to be employed as microbial inoculants for protecting plants against phytopathogens, environmental stress and increasing plant growth and productivity.
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Affiliation(s)
- Oluwaseun Adeyinka Fasusi
- Food Security and Safety Niche, Faculty of Natural and Agricultural Science, North-West University, Private Mail Bag X2046, Mmabatho, 2735, South Africa
| | - Adenike Eunice Amoo
- Food Security and Safety Niche, Faculty of Natural and Agricultural Science, North-West University, Private Mail Bag X2046, Mmabatho, 2735, South Africa
| | - Olubukola Oluranti Babalola
- Food Security and Safety Niche, Faculty of Natural and Agricultural Science, North-West University, Private Mail Bag X2046, Mmabatho, 2735, South Africa.
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Blanco Carrero EL, Castro Molina Y. Antagonismo de rizobacterias sobre hongos fitopatógenos, y su actividad microbiana con potencial biofertilizante, bioestimulante y biocontrolador. REVISTA COLOMBIANA DE BIOTECNOLOGÍA 2021. [DOI: 10.15446/rev.colomb.biote.v23n1.84808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Las rizobacterias forman parte de la gran cantidad de microorganismos que actúan como agentes de biocontrol, produciendo metabolitos que inducen resistencia sistémica en las plantas que inhiben el crecimiento de patógenos. El objetivo de esta investigación fue evaluar la capacidad de diez rizobacterias de los géneros Rhizobium, Bradyrhizobium, Sinorhizobium, Ochrobactrum y Pseudomonas para producir ácido cianhídrico (HCN), sideróforos y ácido indol-acético (AIA), disolver fosfato, fijar nitrógeno e inhibir el crecimiento de fitopatógenos. Se realizaron todas las pruebas fisiológicas y bioquímicas correspondientes, así como la prueba de antagonismo in vitro contra los fitopatógenos Fusarium oxysporum, Colletotrichum gloeosporioides y Rhizoctonia solani. Cinco cepas produjeron una mayor cantidad de AIA en relación a las otras en presencia de triptófano, la cepa ES1 (Ochrobactrum sp.) produjo HCN, el 50 % de las cepas evaluadas liberaron sideróforos, el 60 % disolvió fósforo, y todas resultaron positivas para la fijación de nitrógeno. Nueve cepas inhibieron el crecimiento de F. oxysporum entre 40 % y 65 %, la cepa Alf (Pseudomonas fluorescens) inhibió además el crecimiento de C. gloeosporioides en un 22 %, y ninguna inhibió el crecimiento de R. solani. Los rizobios evaluados y la cepa de Pseudomonas fluorescens podrían ejercer efectos beneficiosos sobre las plantas a través de mecanismos directos e indirectos, o una combinación de ambos, lo que las convierte en una opción sostenible para la producción de cultivos.
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Plant Growth Promoting Rhizobacteria, Arbuscular Mycorrhizal Fungi and Their Synergistic Interactions to Counteract the Negative Effects of Saline Soil on Agriculture: Key Macromolecules and Mechanisms. Microorganisms 2021; 9:microorganisms9071491. [PMID: 34361927 PMCID: PMC8307984 DOI: 10.3390/microorganisms9071491] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 07/05/2021] [Accepted: 07/09/2021] [Indexed: 11/16/2022] Open
Abstract
Soil saltiness is a noteworthy issue as it results in loss of profitability and development of agrarian harvests and decline in soil health. Microorganisms associated with plants contribute to their growth promotion and salinity tolerance by employing a multitude of macromolecules and pathways. Plant growth promoting rhizobacteria (PGPR) have an immediate impact on improving profitability based on higher crop yield. Some PGPR produce 1-aminocyclopropane-1-carboxylic (ACC) deaminase (EC 4.1.99.4), which controls ethylene production by diverting ACC into α-ketobutyrate and ammonia. ACC deaminase enhances germination rate and growth parameters of root and shoot in different harvests with and without salt stress. Arbuscular mycorrhizal fungi (AMF) show a symbiotic relationship with plants, which helps in efficient uptake of mineral nutrients and water by the plants and also provide protection to the plants against pathogens and various abiotic stresses. The dual inoculation of PGPR and AMF enhances nutrient uptake and productivity of several crops compared to a single inoculation in both normal and stressed environments. Positively interacting PGPR + AMF combination is an efficient and cost-effective recipe for improving plant tolerance against salinity stress, which can be an extremely useful approach for sustainable agriculture.
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Profiling of Plant Growth-Promoting Metabolites by Phosphate-Solubilizing Bacteria in Maize Rhizosphere. PLANTS 2021; 10:plants10061071. [PMID: 34071755 PMCID: PMC8229199 DOI: 10.3390/plants10061071] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/12/2021] [Accepted: 05/19/2021] [Indexed: 11/24/2022]
Abstract
Microbial treatment has recently been attracting attention as a sustainable agricultural strategy addressing the current problems caused by unreasonable agricultural practices. However, the mechanism through which microbial inoculants promote plant growth is not well understood. In this study, two phosphate-solubilizing bacteria (PSB) were screened, and their growth-promoting abilities were explored. At day 7 (D7), the lengths of the root and sprout with three microbial treatments, M16, M44, and the combination of M16 and M44 (Com), were significantly greater than those with the non-microbial control, with mean values of 9.08 and 4.73, 7.15 and 4.83, and 13.98 and 5.68 cm, respectively. At day 14 (D14), M16, M44, and Com significantly increased not only the length of the root and sprout but also the underground and aboveground biomass. Differential metabolites were identified, and various amino acids, amino acid derivatives, and other plant growth-regulating molecules were significantly enhanced by the three microbial treatments. The profiling of key metabolites associated with plant growth in different microbial treatments showed consistent results with their performances in the germination experiment, which revealed the metabolic mechanism of plant growth-promoting processes mediated by screened PSB. This study provides a theoretical basis for the application of PSB in sustainable agriculture.
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Effects of Mineral-Solubilizing Microorganisms on Root Growth, Soil Nutrient Content, and Enzyme Activities in the Rhizosphere Soil of Robinia pseudoacacia. FORESTS 2021. [DOI: 10.3390/f12010060] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: Abandoned mining sites are becoming increasingly common due to anthropogenic activities. Consequently, external-soil spray seeding technology has attracted increasing attention as a strategy to remediate them. However, significant challenges remain that greatly inhibit the efficacy of such technologies, such as insufficient nutrients available for plants. Methods: For this study, we designed an experiment, which involved the addition of mineral-solubilizing microorganisms and R. pseudoacacia seedlings to the external-soil spray seeding (ESSS) substrate, and measured the soil nutrients, enzyme activities, and root growth of R. pseudoacacia. Results: First, the combination of certain mineral-solubilizing microorganisms with ESSS advanced its efficiency by increasing the availability of soil nutrients and soil enzymatic activities in association with R. pseudoacacia. Furthermore, the improvement of root growth of R. pseudoacacia was intimately related to soil nutrients, particularly for soil total nitrogen (TN) and total sulfur (TS). In general, the effects of the J2 (combined Bacillus thuringiensis and Gongronella butleri) treatment for soil nutrients, enzyme activities, and plant growth were the strongest. Conclusion: In summary, the results of our experiment revealed that these mineral-solubilizing microorganisms conveyed a promotional effect on R. pseudoacacia seedlings by increasing the soil nutrient content. These results provide basic data and microbial resources for the development and applications of mineral-solubilizing microorganisms for abandoned mine remediation.
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Staphylococcus hominis YJILJH and Staphylococcus epidermidis YJ101 promote the growth of white clover (Trifolium repens L.) by increasing available phosphorus. Symbiosis 2020. [DOI: 10.1007/s13199-020-00739-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abdel Latef AAH, Zaid A, Abo-Baker ABAE, Salem W, Abu Alhmad MF. Mitigation of Copper Stress in Maize by Inoculation with Paenibacillus polymyxa and Bacillus circulans. PLANTS 2020; 9:plants9111513. [PMID: 33171623 PMCID: PMC7695152 DOI: 10.3390/plants9111513] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 10/31/2020] [Accepted: 11/06/2020] [Indexed: 01/24/2023]
Abstract
Copper (Cu) is a micronutrient that assumes a principal role in plant growth and development. However, its excess concentration in soil is imperiling crop productivity. Inoculation with different bacterial strains in cereals could modify growth traits, photosynthetic effectiveness, and generation of strong antioxidant defense systems to make them more tolerant of Cu stress. Therefore, a pot study was designed to test plant growth-promoting rhizobacteria (PGPR) including Paenibacillus polymyxa and Bacillus circulans to Cu exposed maize (Zea mays L.) plants. Increasing Cu (100 to 500 µM of CuSO4) concentration decreased growth traits, photosynthetic pigments, soluble sugars, phosphorous (P) and potassium (K) contents, and the activity of catalase (CAT) but increased proline and malondialdehyde (MDA) content, the activity of peroxidase (POD) and Cu ions at root and shoot level. Moreover, the bacterial treatment also modulated the antioxidant capability in stress-free plants. Nevertheless, inoculation with P. polymyxa and B. circulans alleviated Cu-induced growth, photosynthetic pigments and mineral nutrient (P and K) on one hand and regulating the pools of osmolytes and antioxidant enzymes, whilst simultaneously reducing MDA and Cu root and shoot contents. These improved activities of antioxidant enzymes and the regulation of osmolytes content elicited by the blend of bacterial inoculation would have retained the ability of maize plants to confer resilience to Cu stress. This study further affirms that the application of two specific bacterial strains to maize plants proved very effective to ameliorate the Cu toxicity.
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Affiliation(s)
- Arafat Abdel Hamed Abdel Latef
- Biology Department, Turabah University College, Turabah Branch, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- Botany and Microbiology Department, Faculty of Science, South Valley University, Qena 83523, Egypt; (W.S.); (M.F.A.A.)
- Correspondence: or or
| | - Abbu Zaid
- Plant Physiology and Biochemistry Section, Department of Botany, Aligarh Muslim University, Aligarh 202002, India;
| | | | - Wesam Salem
- Botany and Microbiology Department, Faculty of Science, South Valley University, Qena 83523, Egypt; (W.S.); (M.F.A.A.)
| | - Mona Fawzy Abu Alhmad
- Botany and Microbiology Department, Faculty of Science, South Valley University, Qena 83523, Egypt; (W.S.); (M.F.A.A.)
- Biology Department, Faculty of Science, Taif University, Al-Hawiyah, Taif 21944, Saudi Arabia
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Pérez-Rodriguez MM, Piccoli P, Anzuay MS, Baraldi R, Neri L, Taurian T, Lobato Ureche MA, Segura DM, Cohen AC. Native bacteria isolated from roots and rhizosphere of Solanum lycopersicum L. increase tomato seedling growth under a reduced fertilization regime. Sci Rep 2020; 10:15642. [PMID: 32973225 PMCID: PMC7515909 DOI: 10.1038/s41598-020-72507-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 08/27/2020] [Indexed: 11/09/2022] Open
Abstract
In semiarid regions is important to use native strains best adapted to these environments to optimize plant-PGPR interaction. We aimed to isolate and characterize PGPR from roots and rhizosphere of a tomato crop, as well as studying the effect of its inoculation on tomato seedlings growth. We selected four strains considering their effectiveness of fixing nitrogen, solubilizing phosphate, producing siderophores and indole acetic acid. They belong to the genera Enterobacter, Pseudomonas, Cellulosimicrobium, and Ochrobactrum. In addition, we also analyzed the ability to solubilize Ca3(PO4)2, FePO4 and AlPO4 and the presence of one of the genes encoding the cofactor PQQ in their genome. Enterobacter 64S1 and Pseudomonas 42P4 showed the highest phosphorus solubilizing activity and presence of pqqE gene. Furthermore, in a tomato-based bioassay in speed-bed demonstrated that a sole inoculation at seedling stage with the strains increased dry weight of roots (49-88%) and shoots (39-55%), stem height (8-13%) and diameter (5-8%) and leaf area (22-31%) and were equal or even higher than fertilization treatment. Leaf nitrogen and chlorophyll levels were also increased (50-80% and 26-33%) compared to control. These results suggest that Enterobacter 64S1 and Pseudomonas 42P4 can be used as bio-inoculant in order to realize a nutrient integrated management.
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Affiliation(s)
- María Micaela Pérez-Rodriguez
- Instituto de Biología Agrícola de Mendoza (IBAM-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, 5507, Chacras de Coria, Mendoza, Argentina
| | - Patricia Piccoli
- Instituto de Biología Agrícola de Mendoza (IBAM-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, 5507, Chacras de Coria, Mendoza, Argentina
| | - María Soledad Anzuay
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina
| | - Rita Baraldi
- National Research Council of Italy, Institute of BioEconomy (CNR-IBE), via P. Gobetti 101, 40129, Bologna, Italy
| | - Luisa Neri
- National Research Council of Italy, Institute of BioEconomy (CNR-IBE), via P. Gobetti 101, 40129, Bologna, Italy
| | - Tania Taurian
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina
| | - Miguel Andrés Lobato Ureche
- Instituto de Biología Agrícola de Mendoza (IBAM-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, 5507, Chacras de Coria, Mendoza, Argentina
| | - Diana María Segura
- Instituto de Biología Agrícola de Mendoza (IBAM-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, 5507, Chacras de Coria, Mendoza, Argentina
| | - Ana Carmen Cohen
- Instituto de Biología Agrícola de Mendoza (IBAM-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, 5507, Chacras de Coria, Mendoza, Argentina.
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Hii YS, Yen San C, Lau SW, Danquah MK. Isolation and characterisation of phosphate solubilizing microorganisms from peat. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101643] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Ha DD, Nguyen TO. Application of Methylopila sp. DKT for Bensulfuron-methyl Degradation and Peanut Growth Promotion. Curr Microbiol 2020; 77:1466-1475. [PMID: 32219473 DOI: 10.1007/s00284-020-01953-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 03/13/2020] [Indexed: 11/24/2022]
Abstract
Bensulfuron-methyl is an herbicide widely used for weed control although its residues cause damage to other crops during crop rotations. In this study, the biodegrading activity of bensulfuron-methyl by a plant growth-promoting bacterial strain was carried out. Methylopila sp. DKT isolated from soil was determined for bensulfuron-methyl degradation and phosphate solubilization in the liquid media and soil. Moreover, the effects of the herbicide on peanut development and the role of Methylopila sp. DKT on the growth promotion of peanut were investigated. The results showed that the isolate effectively utilized the compound as a sole carbon source and solubilized low soluble inorganic phosphates. Methylopila sp. DKT also utilized 2-amino-4,6-dimethoxypyrimidine, a metabolite of bensulfuron-methyl degradation, as a sole carbon and energy source, and released ammonium and nitrate. The supplementation with Methylopila sp. DKT in soil increased the peanut biomass and the phosphorus content in the plant. In addition, the inoculation with Methylopila sp. DKT in soil and peanut cultivation increased the bensulfuron-methyl degradation by 57.7% for 1 month, which suggests that both plants and the bacterial isolate play a key role in herbicide degradation. These results indicate that the studied strain has a high potential for soil remediation and peanut growth promotion.
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Affiliation(s)
- Danh Duc Ha
- Dong Thap University, Pham Huu Lau Str., Cao Lanh City, 870000, Dong Thap Province, Viet Nam.
| | - Thị Oanh Nguyen
- Dong Thap University, Pham Huu Lau Str., Cao Lanh City, 870000, Dong Thap Province, Viet Nam
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Li H, Wang Y, Fu J, Hu S, Qu J. Degradation of acetochlor and beneficial effect of phosphate-solubilizing Bacillus sp. ACD-9 on maize seedlings. 3 Biotech 2020; 10:67. [PMID: 32030336 PMCID: PMC6981330 DOI: 10.1007/s13205-020-2056-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 01/04/2020] [Indexed: 12/30/2022] Open
Abstract
The biodegradation of acetochlor in solution and soil and improvements in the growth of maize seedlings by a phosphate-solubilizing bacterial strain were investigated in this research. The strain Bacillus sp. ACD-9 optimally degraded acetochlor at pH 6.0 and 42 °C in solution. And acetochlor with an initial concentration of 30 mg/L was efficiently (> 60%) degraded by the strain after 2 days in solution. Acetochlor biodegradation and the resulting beneficial products were also identified by LC-MS, and the probable degradation products of acetochlor and two kinds of plant growth hormones, namely, 2-chloro-N-(2-methyl-6-ethylphenyl) acetamide (CMEPA), indoleacetic acid (IAA), and zeatin, were detected from the fermentation broth of strain ACD-9. The effects of the strain on the growth and acetochlor accumulation of maize seedlings were also analyzed in laboratory-scale pot experiments. Inoculation of the strain in soil could significantly improve growth (> 9.4%) and phosphorus uptake (> 14.8%) and decrease the accumulation (> 70%) and toxic effects of acetochlor on seedlings. Taking the results together, strain ACD-9 may be useful in the degradation of acetochlor in soil and promotion of the growth and phosphorus uptake of maize.
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Affiliation(s)
- Haifeng Li
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001 Henan China
| | - Yuanli Wang
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001 Henan China
| | - Jiake Fu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001 Henan China
| | - Shuang Hu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001 Henan China
| | - Jianhang Qu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, 450001 Henan China
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Ludueña LM, Anzuay MS, Angelini JG, McIntosh M, Becker A, Rupp O, Goesmann A, Blom J, Fabra A, Taurian T. Genome sequence of the endophytic strain Enterobacter sp. J49, a potential biofertilizer for peanut and maize. Genomics 2019; 111:913-920. [DOI: 10.1016/j.ygeno.2018.05.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/21/2018] [Accepted: 05/25/2018] [Indexed: 10/16/2022]
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Jiang Z, Zhang X, Wang Z, Cao B, Deng S, Bi M, Zhang Y. Enhanced biodegradation of atrazine by Arthrobacter sp. DNS10 during co-culture with a phosphorus solubilizing bacteria: Enterobacter sp. P1. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 172:159-166. [PMID: 30708227 DOI: 10.1016/j.ecoenv.2019.01.070] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/19/2019] [Accepted: 01/23/2019] [Indexed: 06/09/2023]
Abstract
The interaction between pure culture microorganisms has been evaluated allowing for the enhanced biodegradation of various kinds of pollutants. Arthrobacter sp. DNS10 previously enriched in an atrazine-containing soil was capable of utilizing atrazine as the sole nitrogen source for growth, and Enterobacter sp. P1 is a phosphorus-solubilizing bacterium that releases various kinds of organic acids but lacks the ability to degrade atrazine. Whether strain P1 could enhance atrazine biodegradation by the degrader strain DNS10 was investigated in this experiment. Gas chromatography and high-performance liquid chromatography results showed that co-culture of both strains degraded 99.18 ± 1.00% of the atrazine (initial concentration was 100 mg L-1), while the single strain DNS10 only degraded 38.57 ± 7.39% after a 48 h culture, and the resulting concentration of the atrazine final metabolite cyanuric acid were 63.91 ± 3.34 mg L-1 and 26.60 ± 3.87 mg L-1, respectively. In addition, the expression of the atrazine degradation-related genes trzN, atzB and atzC in co-culture treatments was 6.61, 1.81 and 3.09 times that of the single strain DNS10 culture treatment. A substrates utilization test showed that the atrazine-degrading metabolites ethylamine and isopropylamine could serve as the nitrogen source to support strain P1 growth, although strain P1 cannot degrade atrazine or utilize atrazine for growth. Furthermore, the pH of the medium was significantly decreased when strain P1 utilized ethylamine and isopropylamine as the nitrogen source for growth. The results suggest that nondegrader strain P1 could promote the atrazine biodegradation when co-cultured with strain DNS10. This phenomenon is due to metabolite exchange between the two strains. Culturing these two strains together is a new biostimulation strategy to enhance the biodegradation of atrazine by culturing these two strains together.
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Affiliation(s)
- Zhao Jiang
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Xiuyuan Zhang
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Ziyi Wang
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Bo Cao
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Shijie Deng
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Mingchun Bi
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Ying Zhang
- School of Resources & Environment, Northeast Agricultural University, Harbin 150030, PR China.
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Jayakumar A, Perinchery A, Jaffer FM, Radhakrishnan EK. Differential modulation of phytoelemental composition by selected Pseudomonas spp. 3 Biotech 2018; 8:377. [PMID: 30148027 DOI: 10.1007/s13205-018-1400-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 08/07/2018] [Indexed: 11/28/2022] Open
Abstract
Plant growth promoting rhizobacteria (PGPR) are bioresources with potential application in ecofriendly agricultural practices. The beneficial effects of PGPR have been attributed to their ability to produce phytohormone, organic acid, siderophore, and also due to nitrogen fixation among others. In the present study, previously isolated plant growth promoting rhizospheric Pseudomonas spp. were evaluated for growth enhancement effect in Vigna unguiculata seedlings. Elemental profiling of treated plant was further carried out by inductively coupled plasma-mass spectroscopy. Results of the study showed significant increase in growth parameters such as shoot length, root length and root numbers for treated plants when compared to control. Most of the macro and micro elements were also found to get modulated by interaction with applied Pseudomonas spp. However, a differential modulation was observed for plants when treated with each of the Pseudomonas spp., which could be due to their variable interaction with the selected plant. The results of the study indicate the role of each of the associated microbial partner to specifically influence the plant nutrient mobilization along the soil plant axis. The cumulative effect of the plant microbiome hence may decide the global nutritional status of plants as per the available environmental conditions.
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Affiliation(s)
- Aswathy Jayakumar
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala 686560 India
| | - Athira Perinchery
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala 686560 India
| | - Farha M Jaffer
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala 686560 India
| | - E K Radhakrishnan
- School of Biosciences, Mahatma Gandhi University, PD Hills (PO), Kottayam, Kerala 686560 India
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Ribeiro VP, Marriel IE, Sousa SMD, Lana UGDP, Mattos BB, Oliveira CAD, Gomes EA. Endophytic Bacillus strains enhance pearl millet growth and nutrient uptake under low-P. Braz J Microbiol 2018; 49 Suppl 1:40-46. [PMID: 30150087 PMCID: PMC6328806 DOI: 10.1016/j.bjm.2018.06.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 06/19/2018] [Accepted: 06/22/2018] [Indexed: 02/02/2023] Open
Abstract
Bacterial endophytes are considered to have a beneficial effect on host plants, improving their growth by different mechanisms. The objective of this study was to investigate the capacity of four endophytic Bacillus strains to solubilize iron phosphate (Fe-P), produce siderophores and indole-acetic acid (IAA) in vitro, and to evaluate their plant growth promotion ability in greenhouse conditions by inoculation into pearl millet cultivated in a P-deficient soils without P fertilization, with Araxá rock phosphate or soluble triple superphosphate. All strains solubilized Fe-P and three of them produced carboxylate-type siderophores and high levels of IAA in the presence of tryptophan. Positive effect of inoculation of some of these strains on shoot and root dry weight and the N P K content of plants cultivated in soil with no P fertilization might result from the synergistic combination of multiple plant growth promoting (PGP) traits. Specifically, while B1923 enhanced shoot and root dry weight and root N P content of plants cultivated with no P added, B2084 and B2088 strains showed positive performance on biomass production and accumulation of N P K in the shoot, indicating that they have higher potential to be microbial biofertilizer candidates for commercial applications in the absence of fertilization.
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42
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Comparative phosphate solubilizing efficiency of psychrotolerant Pseudomonas jesenii MP1 and Acinetobacter sp. ST02 against chickpea for sustainable hill agriculture. Biologia (Bratisl) 2018. [DOI: 10.2478/s11756-018-0089-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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