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Wang F, Jia M, Li K, Cui Y, An L, Sheng H. Sphingomonas sp. Hbc-6 alters Arabidopsis metabolites to improve plant growth and drought resistance by manipulating the microbiome. Microbiol Res 2024; 287:127852. [PMID: 39084119 DOI: 10.1016/j.micres.2024.127852] [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: 05/15/2024] [Revised: 07/08/2024] [Accepted: 07/17/2024] [Indexed: 08/02/2024]
Abstract
Drought significantly affects crop productivity and poses a considerable threat to agricultural ecosystems. Plant growth-promoting bacteria (PGPB) and plant microbiome play important roles in improving drought resistance and plant performance. However, the response of the rhizosphere microbiota to PGPB during the development of plants and the interaction between inoculum, microbiota, and plants under drought stress remain to be explored. In the present study, we used culturomic, microbiomic, and metabonomic analyses to uncover the mechanisms by which Sphingomonas sp. Hbc-6, a PGPB, promotes Arabidopsis growth and enhances drought resistance. We found that the rhizosphere microbiome assembly was interactively influenced by developmental stage, Hbc-6, and drought; the bacterial composition exhibited three patterns of shifts with developmental stage: resilience, increase, and decrease. Drought diminished microbial diversity and richness, whereas Hbc-6 increased microbial diversity and helped plants recruit specific beneficial bacterial taxa at each developmental stage, particularly during the bolting stage. Some microorganisms enriched by Hbc-6 had the potential to promote carbon and nitrogen cycling processes, and 86.79 % of the isolated strains exhibited PGP characteristics (for example Pseudomonas sp. TA9). They jointly regulated plant physiological metabolism (i.e., upregulated drought resistant-facilitating substances and reduced harmful substances), thereby stimulating the growth of Arabidopsis and increasing plant biomass under drought stress conditions. Collectively, these results indicate that Hbc-6 mediates plant growth and drought resistance by affecting the microbiome. The study thus provides novel insights and strain resources for drought-resistant, high-yielding crop cultivation and breeding.
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Affiliation(s)
- Fang Wang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Mingyue Jia
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Kun Li
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Yafang Cui
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Lizhe An
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China; The College of Forestry, Beijing Forestry University, Beijing, China
| | - Hongmei Sheng
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China.
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Pan L, Cai B. Phosphate-Solubilizing Bacteria: Advances in Their Physiology, Molecular Mechanisms and Microbial Community Effects. Microorganisms 2023; 11:2904. [PMID: 38138048 PMCID: PMC10745930 DOI: 10.3390/microorganisms11122904] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 11/29/2023] [Accepted: 11/29/2023] [Indexed: 12/24/2023] Open
Abstract
Phosphorus is an essential nutrient for all life on earth and has a major impact on plant growth and crop yield. The forms of phosphorus that can be directly absorbed and utilized by plants are mainly HPO42- and H2PO4-, which are known as usable phosphorus. At present, the total phosphorus content of soils worldwide is 400-1000 mg/kg, of which only 1.00-2.50% is plant-available, which seriously affects the growth of plants and the development of agriculture, resulting in a high level of total phosphorus in soils and a scarcity of available phosphorus. Traditional methods of applying phosphorus fertilizer cannot address phosphorus deficiency problems; they harm the environment and the ore material is a nonrenewable natural resource. Therefore, it is imperative to find alternative environmentally compatible and economically viable strategies to address phosphorus scarcity. Phosphorus-solubilizing bacteria (PSB) can convert insoluble phosphorus in the soil into usable phosphorus that can be directly absorbed by plants, thus improving the uptake and utilization of phosphorus by plants. However, there is no clear and systematic report on the mechanism of action of PSB. Therefore, this paper summarizes the discovery process, species, and distribution of PSB, focusing on the physiological mechanisms outlining the processes of acidolysis, enzymolysis, chelation and complexation reactions of PSB. The related genes regulating PSB acidolysis and enzymatic action as well as genes related to phosphate transport and the molecular direction mechanism of its pathway are examined. The effects of PSB on the structure and abundance of microbial communities in soil are also described, illustrating the mechanism of how PSB interact with microorganisms in soil and indirectly increase the amount of available phosphorus in soil. And three perspectives are considered in further exploring the PSB mechanism in utilizing a synergistic multi-omics approach, exploring PSB-related regulatory genes in different phosphorus levels and investigating the application of PSB as a microbial fungicide. This paper aims to provide theoretical support for improving the utilization of soil insoluble phosphorus and providing optimal management of elemental phosphorus in the future.
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Affiliation(s)
- Lin Pan
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, China;
| | - Baiyan Cai
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, China;
- Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao 066102, China
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Asghar I, Ahmed M, Farooq MA, Ishtiaq M, Arshad M, Akram M, Umair A, Alrefaei AF, Jat Baloch MY, Naeem A. Characterizing indigenous plant growth promoting bacteria and their synergistic effects with organic and chemical fertilizers on wheat ( Triticum aestivum). FRONTIERS IN PLANT SCIENCE 2023; 14:1232271. [PMID: 37727857 PMCID: PMC10505817 DOI: 10.3389/fpls.2023.1232271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/24/2023] [Indexed: 09/21/2023]
Abstract
The excessive use of chemical fertilizers is deteriorating both the environment and soil, making it a big challenge faced by sustainable agriculture. To assist the efforts for the solution of this burning issue, nine different potential native strains of plant growth-promoting bacteria (PGPB) namely, SA-1(Bacillus subtilis), SA-5 (Stenotrophomonas humi),SA-7(Azospirillum brasilense), BH-1(Azospirillum oryzae), BH-7(Azotobacter armeniacus), BH-8(Rhizobium pusense), BA-3(Azospirillum zeae), BA-6(Rhizobium pusense), and BA-7(Pseudomonas fragi) were isolated that were characterized morphologically, biochemically and molecularly on the basis of 16S rRNA sequencing. Furthermore, the capability of indigenous PGPB in wheat (Triticum aestivum, Chakwal-50) under control, DAP+FYM, SA-1,5,7, BH-1,7,8, BA-3,6,7, DAP+ FYM + SA-1,5,7, DAP+FYM+ BH-1,7,8 and DAP+FYM+ BA-3,6,7 treatments was assessed in a randomized complete block design (RCBD). The results of the study showed that there was a significant increase in plant growth, nutrients, quality parameters, crop yield, and soil nutrients at three depths under SA-1,5,7, BH-1,7,8, and BA-3,6,7 in combination with DAP+FYM. Out of all these treatments, DAP+ FYM + BA-3,6,7 was found to be the most efficient for wheat growth having the highest 1000-grain weight of 55.1 g. The highest values for plant height, no. of grains/spike, spike length, shoot length, root length, shoot dry weight, root dry weight, 1000 grain weight, biological yield, and economic yield were found to be 90.7 cm, 87.7 cm, 7.20 cm, 53.5 cm, 33.5 cm, 4.87 g, 1.32 g, 55.1 g, 8209 kg/h, and 4572 kg/h, respectively, in the DAP+FYM+BA treatment. The DAP+FYM+BA treatment had the highest values of TN (1.68 µg/mL), P (0.38%), and K (1.33%). Likewise, the value of mean protein (10.5%), carbohydrate (75%), lipid (2.5%), and available P (4.68 ppm) was also highest in the DAP+FYM+BA combination. C:P was found to be significantly highest (20.7) in BA alone but was significantly lowest (11.9) in DAP+FYM+BA. Hence, the integration of strains BA-3, BA-5, and BA-7 in fertilizers can be regarded as the most suitable choice for agricultural growth in the sub-mountainous lower region of AJK. This could serve as the best choice for sustainable wheat growth and improved soil fertility with lesser impacts on the environment.
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Affiliation(s)
- Israr Asghar
- Department of Biotechnology, Mirpur University of Science and Technology (MUST), Mirpur, Pakistan
| | - Maqsood Ahmed
- Department of Biotechnology, Mirpur University of Science and Technology (MUST), Mirpur, Pakistan
| | - Muhammad Ansar Farooq
- Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Muhammad Ishtiaq
- Department of Botany, Mirpur University of Science and Technology (MUST), Bhimber, Pakistan
| | - Muhammad Arshad
- Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Muhammad Akram
- Department of Environmental Sciences, COMSATS University Islamabad (CUI), Vehari, Pakistan
| | - Adnan Umair
- Department of Agriculture, Research wing, Soil and Water Testing Laboratory, Sialkot, Pakistan
| | | | | | - Aamna Naeem
- Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan
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Li M, Wang J, Yao T, Wang Z, Zhang H, Li C. Isolation and Characterization of Cold-Adapted PGPB and Their Effect on Plant Growth Promotion. J Microbiol Biotechnol 2021; 31:1218-1230. [PMID: 34261854 PMCID: PMC9705895 DOI: 10.4014/jmb.2105.05012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 07/09/2021] [Accepted: 07/13/2021] [Indexed: 12/15/2022]
Abstract
Cold-adapted plant growth-promoting bacteria (PGPB) with multiple functions are an important resource for microbial fertilizers with low-temperature application. In this study, culturable cold-adapted PGPB strains with nitrogen fixation and phosphorus solubilization abilities were isolated. They were screened from root and rhizosphere of four dominant grass species in nondegraded alpine grasslands of the Qilian Mountains, China. Their other growth-promoting characteristics, including secretion of indole-3-acetic acid (IAA), production of siderophores and ACC deaminase, and antifungal activity, were further studied by qualitative and quantitative methods. In addition, whether the PGPB strains could still exert plant growth-promoting activity at 4°C was verified. The results showed that 67 isolates could maintain one or more growth-promoting traits at 4°C, and these isolates were defined as cold-adapted PGPB. They were divided into 8 genera by 16S rRNA gene sequencing and phylogenetic analysis, of which Pseudomonas (64.2%) and Serratia (13.4%) were the common dominant genera, and a few specific genera varied among the plant species. A test-tube culture showed that inoculation of Elymus nutans seedlings with cold-adapted PGPB possessing different functional characteristics had a significant growth-promoting effect under controlled low-temperature conditions, including the development of the roots and aboveground parts. Pearson correlation analysis revealed that different growth-promoting characteristics made different contributions to the development of the roots and aboveground parts. These cold-adapted PGPB can be used as excellent strain resources suitable for the near-natural restoration of degraded alpine grasslands or agriculture stock production in cold areas.
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Affiliation(s)
- Mingyuan Li
- College of Grassland Science, Gansu Agricultural University, Lanzhou 730000, P.R. China,College of Biologic and Geographic Sciences, Kashi University, Kashi 844000, P.R. China,Key Laboratory of Ecology and Biological Resources in Yarkand Oasis of Education of Xinjiang Uygur Autonomous Region, Kashi 844000, P.R. China
| | - Jilian Wang
- College of Biologic and Geographic Sciences, Kashi University, Kashi 844000, P.R. China,Key Laboratory of Ecology and Biological Resources in Yarkand Oasis of Education of Xinjiang Uygur Autonomous Region, Kashi 844000, P.R. China
| | - Tuo Yao
- College of Grassland Science, Gansu Agricultural University, Lanzhou 730000, P.R. China,Corresponding author Phone: +86-0931-7631227 E-mail:
| | - Zhenlong Wang
- College of Grassland Science, Gansu Agricultural University, Lanzhou 730000, P.R. China
| | - Huirong Zhang
- College of Grassland Science, Gansu Agricultural University, Lanzhou 730000, P.R. China
| | - Changning Li
- College of Grassland Science, Gansu Agricultural University, Lanzhou 730000, P.R. China
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Ercole TG, Savi DC, Adamoski D, Kava VM, Hungria M, Galli-Terasawa LV. Diversity of maize (Zea mays L.) rhizobacteria with potential to promote plant growth. Braz J Microbiol 2021; 52:1807-1823. [PMID: 34458975 DOI: 10.1007/s42770-021-00596-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 08/15/2021] [Indexed: 11/30/2022] Open
Abstract
Plant growth-limiting factors, such as low nutrient availability and weak pathogen resistance, may hinder the production of several crops. Plant growth-promoting bacteria (PGPB) used in agriculture, which stimulate plant growth and development, can serve as a potential tool to mitigate or even circumvent these limitations. The present study evaluated the feasibility of using bacteria isolated from the maize rhizosphere as PGPB for the cultivation of this crop. A total of 282 isolates were collected and clustered into 57 groups based on their genetic similarity using BOX-PCR. A representative isolate from each group was selected and identified at the genus level with 16S rRNA sequencing. The identified genera included Bacillus (61.5% of the isolates), Lysinibacillus (30.52%), Pseudomonas (3.15%), Stenotrophomonas (2.91%), Paenibacillus (1.22%), Enterobacter (0.25%), Rhizobium (0.25%), and Atlantibacter (0.25%). Eleven isolates with the highest performance were selected for analyzing the possible pathways underlying plant growth promotion using biochemical and molecular techniques. Of the selected isolates, 90.9% were positive for indolepyruvate/phenylpyruvate decarboxylase, 54.4% for pyrroloquinoline quinine synthase, 36.4% for nitrogenase reductase, and 27.3% for nitrite reductase. Based on biochemical characterization, 9.1% isolates could fix nitrogen, 36.6% could solubilize phosphate, 54.5% could produce siderophores, and 90.9% could produce indole acetic acid. Enzymatic profiling revealed that the isolates could degrade starch (90.1%), cellulose (72.7%), pectin (81.8%), protein (90.9%), chitin (18.2%), urea (54.5%), and esters (45.4%). Based on the data obtained, we identified three Bacillus spp. (LGMB12, LGMB273, and LGMB426), one Stenotrophomonas sp. (LGMB417), and one Pseudomonas sp. (LGMB456) with the potential to serve as PGPB for maize. Further research is warranted to evaluate the biotechnological potential of these isolates as biofertilizers under field conditions.
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Affiliation(s)
- Tairine G Ercole
- Department of Genetics, Universidade Federal Do Paraná, Av. Coronel Francisco Heráclito Dos Santos, 210. CEP, Curitiba, PR, 81531-970, Brazil
| | - Daiani C Savi
- Department of Biomedicine, Centro Universitário Católica de Santa Catarina, R. Visconde de Taunay, 427. CEP, Joinville, SC, 89203-005, Brazil
| | - Douglas Adamoski
- Department of Genetics, Universidade Federal Do Paraná, Av. Coronel Francisco Heráclito Dos Santos, 210. CEP, Curitiba, PR, 81531-970, Brazil
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), 13083-970, Campinas, Sao Paulo, Brazil
| | - Vanessa M Kava
- Department of Genetics, Universidade Federal Do Paraná, Av. Coronel Francisco Heráclito Dos Santos, 210. CEP, Curitiba, PR, 81531-970, Brazil
| | | | - Lygia V Galli-Terasawa
- Department of Genetics, Universidade Federal Do Paraná, Av. Coronel Francisco Heráclito Dos Santos, 210. CEP, Curitiba, PR, 81531-970, Brazil.
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Wei Y, Wang F, Gao J, Huang Y, Ren W, Sheng H. Culture-dependent and culture-independent characterization of bacterial community diversity in different types of sandy lands: the case of Minqin County, China. BMC Microbiol 2021; 21:87. [PMID: 33752616 PMCID: PMC7986352 DOI: 10.1186/s12866-021-02150-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 03/08/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Minqin is suffering from a serious desertification, whereas the knowledge about its bacterial community is limited. Herein, based on Nitraria tangutorum and Haloxylon ammodendron from Minqin, the bacterial community diversities in fixed sandy land, semi-fixed sandy land and shifting sandy land were investigated by combining with culture-dependent and culture-independent methods. RESULTS Minqin stressed with high salinity and poor nutrition is an oligotrophic environment. Bacterial community in Minqin was shaped primarily by the presence of host plants, whereas the type of plant and sandy land had no marked effect on those, which displayed a better survival in the rhizospheres of N. tangutorum and H. ammodendron. The dominant groups at phyla level were Actinobacteria, Firmicutes, Proteobacteria, Bacteroidetes, Planctomycetes, Chloroflexi, Acidobacteria and Candidate_division_TM7. The abundance of Firmicutes with ability of desiccation-tolerance was significantly higher in harsh environment, whereas Bacteroidetes were mainly distributed in areas with high nutrient content. The abundances of Proteobacteria and Bacteroidetes were relatively high in the rhizospheres of N. tangutorum and H. ammodendron, which had more plant-growth promoting rhizobacteria. A large number of Actinobacteria were detected, of which the most abundant genus was Streptomyces. The physicochemical factors related to the diversity and distribution of the bacterial community were comprehensively analyzed, such as pH, electrical conductivity, soil organic matter, C/N and sand, and the results indicated that Minqin was more suitable for the growth of N. tangutorum, which should be one of most important sand-fixing plants in Minqin. CONCLUSIONS The bacterial community diversities in different types of sandy lands of Minqin were comprehensively and systematically investigated by culture-dependent and culture-independent approaches, which has a great significance in maintaining/restoring biological diversity.
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Affiliation(s)
- Yali Wei
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Fang Wang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Jiangli Gao
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China.,School of medicine, northwest minzu university, Lanzhou, China
| | - Yaolong Huang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Wei Ren
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, China
| | - Hongmei Sheng
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China.
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Bonatelli ML, Lacerda-Júnior GV, dos Reis Junior FB, Fernandes-Júnior PI, Melo IS, Quecine MC. Beneficial Plant-Associated Microorganisms From Semiarid Regions and Seasonally Dry Environments: A Review. Front Microbiol 2021; 11:553223. [PMID: 33519722 PMCID: PMC7845453 DOI: 10.3389/fmicb.2020.553223] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 12/03/2020] [Indexed: 11/13/2022] Open
Abstract
Semiarid regions are apparently low biodiversity environments; however, these environments may host a phylogenetically diverse microbial community associated with plants. Their microbial inhabitants are often recruited to withstand stressful settings and improve plant growth under harsh conditions. Thus, plant-associated microorganisms isolated from semiarid and seasonally dry environments will be detailed in the present review, focusing on plant growth promotion potential and the microbial ability to alleviate plant abiotic stress. Initially, we explored the role of microbes from dry environments around the world, and then, we focused on seasonally dry Brazilian biomes, the Caatinga and the Cerrado. Cultivable bacteria from semiarid and seasonally dry environments have demonstrated great plant growth promotion traits such as plant hormone production, mobilization of insoluble nutrients, and mechanisms related to plant abiotic stress alleviation. Several of these isolates were able to improve plant growth under stressful conditions commonly present in typical semiarid regions, such as high salinity and drought. Additionally, we highlight the potential of plants highly adapted to seasonal climates from the Caatinga and Cerrado biomes as a suitable pool of microbial inoculants to maintain plant growth under abiotic stress conditions. In general, we point out the potential for the exploitation of new microbial inoculants from plants growing in dry environments to ensure a sustainable increase in agricultural productivity in a future climate change scenario.
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Affiliation(s)
- Maria Leticia Bonatelli
- Department of Genetics, Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, Brazil
| | | | | | | | - Itamar Soares Melo
- Brazilian Agricultural Research Corporation, Embrapa Meio Ambiente, Jaguariúna, Brazil
| | - Maria Carolina Quecine
- Department of Genetics, Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, Brazil
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Gaete A, Mandakovic D, González M. Isolation and Identification of Soil Bacteria from Extreme Environments of Chile and Their Plant Beneficial Characteristics. Microorganisms 2020; 8:microorganisms8081213. [PMID: 32785053 PMCID: PMC7466141 DOI: 10.3390/microorganisms8081213] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/31/2020] [Accepted: 08/02/2020] [Indexed: 12/15/2022] Open
Abstract
The isolation of soil bacteria from extreme environments represents a major challenge, but also an opportunity to characterize the metabolic potential of soil bacteria that could promote the growth of plants inhabiting these harsh conditions. The aim of this study was to isolate and identify bacteria from two Chilean desert environments and characterize the beneficial traits for plants through a biochemical approach. By means of different culture strategies, we obtained 39 bacterial soil isolates from the Coppermine Peninsula (Antarctica) and 32 from Lejía Lake shore soil (Atacama Desert). The results obtained from the taxonomic classification and phylogenetic analysis based on 16S rDNA sequences indicated that the isolates belonged to four phyla (Proteobacteria, Actinobacteria, Firmicutes, and Bacteroidetes), and that the most represented genus at both sites was Pseudomonas. Regarding biochemical characterization, all strains displayed in vitro PGP capabilities, but these were in different proportions that grouped them according to their site of origin. This study contributes with microbial isolates from natural extreme environments with biotechnological potentials in improving plant growth under cold stress.
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Affiliation(s)
- Alexis Gaete
- Laboratorio de Bioinformática y Expresión Génica, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, El Libano 5524, 7810000 Santiago, Chile;
- Center for Genome Regulation, El Libano 5524, Santiago 7810000, Chile
- Programa de Doctorado en Ciencias Silvoagropecuarias y Veterinarias, Campus Sur Universidad de Chile. Santa Rosa 11315, 8820808 Santiago, Chile
| | - Dinka Mandakovic
- GEMA Center for Genomics, Ecology and Environment, Universidad Mayor, Camino La Pirámide 5750, 8320000 Santiago, Chile;
- Laboratorio de Genómica y Genética de Interacciones Biológicas (LGIB). Instituto de Nutrición y Tecnología de los Alimento, Universidad de Chile. El Líbano 5524, 7810000 Santiago, Chile
| | - Mauricio González
- Laboratorio de Bioinformática y Expresión Génica, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, El Libano 5524, 7810000 Santiago, Chile;
- Center for Genome Regulation, El Libano 5524, Santiago 7810000, Chile
- Correspondence:
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Aiysha D, Latif Z. Insights of organic fertilizer micro flora of bovine manure and their useful potentials in sustainable agriculture. PLoS One 2019; 14:e0226155. [PMID: 31860658 PMCID: PMC6924646 DOI: 10.1371/journal.pone.0226155] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 11/20/2019] [Indexed: 01/19/2023] Open
Abstract
Exploration of diverse environmental samples for plant growth-promoting microbes to fulfill the increasing demand for sustainable agriculture resulted in increased use of bacterial biofertilizer. We aimed for the isolation of plant growth-promoting as well as antibiotic sensitive bacteria from bovine manure samples. The basic theme of our study is to highlight potentials of bacteria in manure and the unchecked risk associated with the application of manure i.e. introducing antibiotic-resistant microbial flora, as fertilizer. Fifty-two, morphologically distinct isolates; from eight different manure samples, were subjected to plant growth-promoting parametric tests along with antibiotic resistance. Thirteen antibiotic sensitive bacterial strains with potentials of plant growth promotion further characterized by 16S rRNA ribotyping and the identified genera were Stenotrophomonas, Achromobacter, Pseudomonas, and Brevibacillus. Successful radish seeds germination under sterile in-vitro conditions showed the potential of selected bacterial isolates as plant growth-promoting bacteria. The results of this study confirmed plant growth-promoting characteristics of bovine manures' bacterial strains along with an alarming antibiotic resistance load which comprises 75% of bacterial isolated population. Our study showed distinct results of un-explored manure bacterial isolates for plant growth promotion and flagged ways associated with unchecked manure application in agriculture soil through high load of antibiotic resistant bacteria.
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Affiliation(s)
- Dalaq Aiysha
- Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan
| | - Zakia Latif
- Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan
- * E-mail:
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