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van Schaik J, Li Z, Cheadle J, Crook N. Engineering the Maize Root Microbiome: A Rapid MoClo Toolkit and Identification of Potential Bacterial Chassis for Studying Plant-Microbe Interactions. ACS Synth Biol 2023; 12:3030-3040. [PMID: 37712562 DOI: 10.1021/acssynbio.3c00371] [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] [Indexed: 09/16/2023]
Abstract
Sustainably enhancing crop production is a global necessity to meet the escalating demand for staple crops while sustainably managing their associated carbon/nitrogen inputs. Leveraging plant-associated microbiomes is a promising avenue for addressing this demand. However, studying these communities and engineering them for sustainable enhancement of crop production have remained a challenge due to limited genetic tools and methods. In this work, we detail the development of the Maize Root Microbiome ToolKit (MRMTK), a rapid Modular Cloning (MoClo) toolkit that only takes 2.5 h to generate desired constructs (5400 potential plasmids) that replicate and express heterologous genes in Enterobacter ludwigii strain AA4 (Elu), Pseudomonas putida strain AA7 (Ppu), Herbaspirillum robiniae strain AA6 (Hro), Stenotrophomonas maltophilia strain AA1 (Sma), and Brucella pituitosa strain AA2 (Bpi), which comprise a model maize root synthetic community (SynCom). In addition to these genetic tools, we describe a highly efficient transformation protocol (107-109 transformants/μg of DNA) 1 for each of these strains. Utilizing this highly efficient transformation protocol, we identified endogenous Expression Sequences (ES; promoter and ribosomal binding sites) for each strain via genomic promoter trapping. Overall, MRMTK is a scalable and adaptable platform that expands the genetic engineering toolbox while providing a standardized, high-efficiency transformation method across a diverse group of root commensals. These results unlock the ability to elucidate and engineer plant-microbe interactions promoting plant growth for each of the 5 bacterial strains in this study.
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Affiliation(s)
- John van Schaik
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Room 2109, Partners II, 840 Main Campus Drive, Raleigh, North Carolina 27606, United States
| | - Zidan Li
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Room 2109, Partners II, 840 Main Campus Drive, Raleigh, North Carolina 27606, United States
| | - John Cheadle
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Room 2109, Partners II, 840 Main Campus Drive, Raleigh, North Carolina 27606, United States
| | - Nathan Crook
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Room 2109, Partners II, 840 Main Campus Drive, Raleigh, North Carolina 27606, United States
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2
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Chaudhary P, Agri U, Chaudhary A, Kumar A, Kumar G. Endophytes and their potential in biotic stress management and crop production. Front Microbiol 2022; 13:933017. [PMID: 36325026 PMCID: PMC9618965 DOI: 10.3389/fmicb.2022.933017] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 09/12/2022] [Indexed: 11/21/2022] Open
Abstract
Biotic stress is caused by harmful microbes that prevent plants from growing normally and also having numerous negative effects on agriculture crops globally. Many biotic factors such as bacteria, fungi, virus, weeds, insects, and nematodes are the major constrains of stress that tends to increase the reactive oxygen species that affect the physiological and molecular functioning of plants and also led to the decrease in crop productivity. Bacterial and fungal endophytes are the solution to overcome the tasks faced with conventional farming, and these are environment friendly microbial commodities that colonize in plant tissues without causing any damage. Endophytes play an important role in host fitness, uptake of nutrients, synthesis of phytohormone and diminish the injury triggered by pathogens via antibiosis, production of lytic enzymes, secondary metabolites, and hormone activation. They are also reported to help plants in coping with biotic stress, improving crops and soil health, respectively. Therefore, usage of endophytes as biofertilizers and biocontrol agent have developed an eco-friendly substitute to destructive chemicals for plant development and also in mitigation of biotic stress. Thus, this review highlighted the potential role of endophytes as biofertilizers, biocontrol agent, and in mitigation of biotic stress for maintenance of plant development and soil health for sustainable agriculture.
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Affiliation(s)
- Parul Chaudhary
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Upasana Agri
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | | | - Ashish Kumar
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - Govind Kumar
- Indian Council of Agricultural Research (ICAR)-Central Institute for Subtropical Horticulture, Lucknow, India
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3
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Lacava PT, Bogas AC, Cruz FDPN. Plant Growth Promotion and Biocontrol by Endophytic and Rhizospheric Microorganisms From the Tropics: A Review and Perspectives. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2022. [DOI: 10.3389/fsufs.2022.796113] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Currently, the tropics harbor a wide variety of crops to feed the global population. Rapid population expansion and the consequent major demand for food and agriculture-based products generate initiatives for tropical forest deforestation, which contributes to land degradation and the loss of macro and micronative biodiversity of ecosystems. Likewise, the entire dependence on fertilizers and pesticides also contributes to negative impacts on environmental and human health. To guarantee current and future food safety, as well as natural resource preservation, systems for sustainable crops in the tropics have attracted substantial attention worldwide. Therefore, the use of beneficial plant-associated microorganisms is a promising sustainable way to solve issues concerning modern agriculture and the environment. Efficient strains of bacteria and fungi are a rich source of natural products that might improve crop yield in numerous biological ways, such as nitrogen fixation, hormone production, mobilization of insoluble nutrients, and mechanisms related to plant biotic and abiotic stress alleviation. Additionally, these microorganisms also exhibit great potential for the biocontrol of phytopathogens and pest insects. This review addresses research regarding endophytic and rhizospheric microorganisms associated with tropical plants as a sustainable alternative to control diseases and enhance food production to minimize ecological damage in tropical ecosystems.
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4
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Madhaiyan M, Selvakumar G, Alex TH, Cai L, Ji L. Plant Growth Promoting Abilities of Novel Burkholderia-Related Genera and Their Interactions With Some Economically Important Tree Species. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2021. [DOI: 10.3389/fsufs.2021.618305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A survey of bacterial endophytes associated with the leaves of oil palm and acacias resulted in the isolation of 19 bacterial strains belonging to the genera Paraburkholderia, Caballeronia, and Chitinasiproducens, which are now regarded as distinctively different from the parent genus Burkholderia. Most strains possessed one or more plant growth promotion (PGP) traits although nitrogenase activity was present in only a subset of the isolates. The diazotrophic Paraburkholderia tropica strain S39-2 with multiple PGP traits and the non-diazotrophic Chitinasiproducens palmae strain JS23T with a significant level of 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity were selected to investigate the influence of bacterial inoculation on some economically important tree species. Microscopic examination revealed that P. tropica S39-2 was rhizospheric as well as endophytic while C. palmae JS23T was endophytic. P. tropica strain S39-2 significantly promoted the growth of oil palm, eucalyptus, and Jatropha curcas. Interestingly, the non-diazotrophic, non-auxin producing C. palmae JS23T strain also significantly promoted the growth of oil palm and eucalyptus although it showed negligible effect on J. curcas. Our results suggest that strains belonging to the novel Burkholderia-related genera widely promote plant growth via both N-independent and N-dependent mechanisms. Our results also suggest that the induction of defense response may prevent the colonization of an endophyte in plants.
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5
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AbdElgawad H, Abuelsoud W, Madany MMY, Selim S, Zinta G, Mousa ASM, Hozzein WN. Actinomycetes Enrich Soil Rhizosphere and Improve Seed Quality as well as Productivity of Legumes by Boosting Nitrogen Availability and Metabolism. Biomolecules 2020; 10:E1675. [PMID: 33333896 PMCID: PMC7765327 DOI: 10.3390/biom10121675] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/23/2020] [Accepted: 11/23/2020] [Indexed: 12/18/2022] Open
Abstract
The use of actinomycetes for improving soil fertility and plant production is an attractive strategy for developing sustainable agricultural systems due to their effectiveness, eco-friendliness, and low production cost. Out of 17 species isolated from the soil rhizosphere of legume crops, 4 bioactive isolates were selected and their impact on 5 legumes: soybean, kidney bean, chickpea, lentil, and pea were evaluated. According to the morphological and molecular identification, these isolates belong to the genus Streptomyces. Here, we showed that these isolates increased soil nutrients and organic matter content and improved soil microbial populations. At the plant level, soil enrichment with actinomycetes increased photosynthetic reactions and eventually increased legume yield. Actinomycetes also increased nitrogen availability in soil and legume tissue and seeds, which induced the activity of key nitrogen metabolizing enzymes, e.g., glutamine synthetase, glutamate synthase, and nitrate reductase. In addition to increased nitrogen-containing amino acids levels, we also report high sugar, organic acids, and fatty acids as well as antioxidant phenolics, mineral, and vitamins levels in actinomycete treated legume seeds, which in turn improved their seed quality. Overall, this study shed the light on the impact of actinomycetes on enhancing the quality and productivity of legume crops by boosting the bioactive primary and secondary metabolites. Moreover, our findings emphasize the positive role of actinomycetes in improving the soil by enriching its microbial population. Therefore, our data reinforce the usage of actinomycetes as biofertilizers to provide sustainable food production and achieve biosafety.
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Affiliation(s)
- Hamada AbdElgawad
- Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62511, Egypt; (H.A.); (A.S.M.M.)
| | - Walid Abuelsoud
- Department of Botany and Microbiology, Faculty of Science, Cairo University, Giza 12613, Egypt; (W.A.); (M.M.Y.M.)
| | - Mahmoud M. Y. Madany
- Department of Botany and Microbiology, Faculty of Science, Cairo University, Giza 12613, Egypt; (W.A.); (M.M.Y.M.)
- Biology Department, College of Science, Taibah University, Al-Madinah Al-Munawarah 41411, Saudi Arabia
| | - Samy Selim
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Jouf University, Sakaka P.O. 2014, Saudi Arabia;
| | - Gaurav Zinta
- Shanghai Center for Plant Stress Biology, Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China;
| | - Ahmed S. M. Mousa
- Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62511, Egypt; (H.A.); (A.S.M.M.)
| | - Wael N. Hozzein
- Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62511, Egypt; (H.A.); (A.S.M.M.)
- Bioproducts Research Chair, Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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6
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Wiriya J, Rangjaroen C, Teaumroong N, Sungthong R, Lumyong S. Rhizobacteria and Arbuscular Mycorrhizal Fungi of Oil Crops (Physic Nut and Sacha Inchi): A Cultivable-Based Assessment for Abundance, Diversity, and Plant Growth-Promoting Potentials. PLANTS 2020; 9:plants9121773. [PMID: 33327574 PMCID: PMC7765041 DOI: 10.3390/plants9121773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 12/04/2020] [Accepted: 12/10/2020] [Indexed: 01/29/2023]
Abstract
Nowadays, oil crops are very attractive both for human consumption and biodiesel production; however, little is known about their commensal rhizosphere microbes. In this study, rhizosphere samples were collected from physic nut and sacha inchi plants grown in several areas of Thailand. Rhizobacteria, cultivable in nitrogen-free media, and arbuscular mycorrhizal (AM) fungi were isolated and examined for abundance, diversity, and plant growth-promoting activities (indole-3-acetic acid (IAA) and siderophore production, nitrogen fixation, and phosphate solubilization). Results showed that only the AM spore amount was affected by plant species and soil features. Considering rhizobacterial diversity, two classes—Alphaproteobacteria (Ensifer sp. and Agrobacterium sp.) and Gammaproteobacteria (Raoultella sp. and Pseudomonas spp.)—were identified in physic nut rhizosphere, and three classes; Actinobacteria (Microbacterium sp.), Betaproteobacteria (Burkholderia sp.) and Gammaproteobacteria (Pantoea sp.) were identified in the sacha inchi rhizosphere. Considering AM fungal diversity, four genera were identified (Acaulospora, Claroideoglomus, Glomus, and Funneliformis) in sacha inchi rhizospheres and two genera (Acaulospora and Glomus) in physic nut rhizospheres. The rhizobacteria with the highest IAA production and AM spores with the highest root-colonizing ability were identified, and the best ones (Ensifer sp. CM1-RB003 and Acaulospora sp. CM2-AMA3 for physic nut, and Pantoea sp. CR1-RB056 and Funneliformis sp. CR2-AMF1 for sacha inchi) were evaluated in pot experiments alone and in a consortium in comparison with a non-inoculated control. The microbial treatments increased the length and the diameter of stems and the chlorophyll content in both the crops. CM1-RB003 and CR1-RB056 also increased the number of leaves in sacha inchi. Interestingly, in physic nut, the consortium increased AM fungal root colonization and the numbers of offspring AM spores in comparison with those observed in sacha inchi. Our findings proved that AM fungal abundance and diversity likely rely on plant species and soil features. In addition, pot experiments showed that rhizosphere microorganisms were the key players in the development and growth of physic nut and sacha inchi.
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Affiliation(s)
- Janjira Wiriya
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Graduate School, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Chakrapong Rangjaroen
- Department of Agricultural Management Technology, Faculty of Science and Technology, Phranakhon Rajabhat University, Bangkok 10220, Thailand;
| | - Neung Teaumroong
- School of Biotechnology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;
| | - Rungroch Sungthong
- Laboratory of Hydrology and Geochemistry of Strasbourg, University of Strasbourg, UMR 7517 CNRS/EOST, Strasbourg CEDEX 67084, France
- Correspondence: (R.S.); (S.L.)
| | - Saisamorn Lumyong
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
- Academy of Science, The Royal Society of Thailand, Bangkok 10300, Thailand
- Correspondence: (R.S.); (S.L.)
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7
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Madhaiyan M, Saravanan VS, Wirth JS, Alex THH, Kim SJ, Weon HY, Kwon SW, Whitman WB, Ji L. Sphingomonas palmae sp. nov. and Sphingomonas gellani sp. nov., endophytically associated phyllosphere bacteria isolated from economically important crop plants. Antonie van Leeuwenhoek 2020; 113:1617-1632. [PMID: 32949307 DOI: 10.1007/s10482-020-01468-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 08/31/2020] [Indexed: 02/08/2023]
Abstract
In this study, two endophytic bacterial strains designated JS21-1T and S6-262T isolated from leaves of Elaeis guineensis and stem tissues of Jatropha curcas respectively, were subjected for polyphasic taxonomic approach. On R2A medium, colonies of strains JS21-1T and S6-262T are orange and yellow, respectively. Phylogenetic analyses using 16S rRNA gene sequencing and whole-genome sequences placed the strains in distinct clades but within the genus Sphingomonas. The DNA G + C content of JS21-1T and S6-262T were 67.31 and 66.95%, respectively. Furthermore, the average nucleotide identity and digital DNA-DNA hybridization values of strains JS21-1T and S6-262T with phylogenetically related Sphingomonas species were lower than 95% and 70% respectively. The chemotaxonomic studies indicated that the major cellular fatty acids of the strain JS21-1T were summed feature 8 (C18:1 ω7c and/or C18:1 ω6c), C16:0, and C14:0 2OH; strain S6-262T possessed summed feature 3 (C16:1 ω7c and/or iso-C15:0 2-OH) and summed feature 8 (C18:1 ω6c and/or C18:1 ω7c). The major quinone was Q10, and the unique polyamine observed was homospermidine. The polar lipid profile comprised of mixture of sphingoglycolipid, phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and certain uncharacterised phospholipids and lipids. Based on this polyphasic evidence, strains JS21-1T and S6-262T represent two novel species of the genus Sphingomonas, for which the names Sphingomonas palmae sp. nov. and Sphingomonas gellani sp. nov. are proposed, respectively. The type strain of Sphingomonas palmae sp. nov. is JS21-1T (= DSM 27348T = KACC 17591T) and the type strain of Sphingomonas gellani sp. nov. is S6-262T (= DSM 27346T = KACC 17594T).
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Affiliation(s)
- Munusamy Madhaiyan
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604, Singapore.
| | | | - Joseph S Wirth
- Department of Biology, Harvey Mudd College, Claremont, CA, 91711, USA
| | - Tan Hian Hwee Alex
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604, Singapore
| | - Soo-Jin Kim
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Hang-Yeon Weon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Soon-Wo Kwon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - William B Whitman
- Department of Microbiology, University of Georgia, 527 Biological Sciences Building, Athens, GA, 30602-2605, USA
| | - Lianghui Ji
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604, Singapore.
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8
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Madhaiyan M, See-Too WS, Ee R, Saravanan VS, Wirth JS, Alex THH, Lin C, Kim SJ, Weon HY, Kwon SW, Whitman WB, Ji L. Chitinasiproducens palmae gen. nov., sp. nov., a new member of the family Burkholderiaceae isolated from leaf tissues of oil palm (Elaeis guineensis Jacq.). Int J Syst Evol Microbiol 2020; 70:2640-2647. [DOI: 10.1099/ijsem.0.004084] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
A Gram-stain-negative, aerobic, rod-shaped, leaf-associated bacterium, designated JS23T, was isolated from surface-sterilized leaf tissue of an oil palm grown in Singapore and was investigated by polyphasic taxonomy. Phylogenetic analyses based on 16S rRNA gene sequences and 180 conserved genes in the genome of several members of
Burkholderiaceae
revealed that strain JS23T formed a distinct evolutionary lineage independent of other taxa within the family
Burkholderiaceae
. The predominant ubiquinone was Q-8. The primary polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, and an unidentified aminophospholipid. The major fatty acids were C16 : 0, summed feature 3 (C16 : 1
ω7c /C16 : 1
ω6c) and summed feature 8 (C18 : 1
ω7c /C18 : 1
ω6c). The size of the genome is 5.36 Mbp with a DNA G+C content of 66.2 mol%. Genomic relatedness measurements such as average nucleotide identity, genome-to-genome distance and digital DNA–DNA hybridization clearly distinguished strain JS23T from the closely related genera
Burkholderia
,
Caballeronia
,
Mycetohabitans
,
Mycoavidus
,
Pandoraea
,
Paraburkholderia
,
Robbsia
and
Trinickia
. Furthermore, average amino acid identity values and the percentages of conserved proteins, 56.0–68.4 and 28.2–45.5, respectively, were well below threshold values for genus delineation and supported the assignment of JS23T to a novel genus. On the basis of the phylogenetic, biochemical, chemotaxonomic and phylogenomic evidence, strain JS23T is proposed to represent a novel species of a new genus within the family
Burkholderiaceae
, for which the name Chitinasiproducens palmae gen. nov., sp. nov., is proposed with the type strain of JS23T (= DSM 27307T=KACC 17592T).
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Affiliation(s)
- Munusamy Madhaiyan
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore
| | - Wah-Seng See-Too
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Robson Ee
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Joseph S. Wirth
- Department of Microbiology, 527 Biological Sciences Building, University of Georgia, Athens, GA 30602-2605, USA
| | - Tan Hian Hwee Alex
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore
| | - Cai Lin
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore
| | - Soo-Jin Kim
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Hang-Yeon Weon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Soon-Wo Kwon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - William B. Whitman
- Department of Microbiology, 527 Biological Sciences Building, University of Georgia, Athens, GA 30602-2605, USA
| | - Lianghui Ji
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore
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9
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Madhaiyan M, Saravanan VS, Blom J, Smits THM, Rezzonico F, Kim SJ, Weon HY, Kwon SW, Whitman WB, Ji L. Phytobacter palmae sp. nov., a novel endophytic, N2 fixing, plant growth promoting Gammaproteobacterium isolated from oil palm (Elaeis guineensis Jacq.). Int J Syst Evol Microbiol 2020; 70:841-848. [DOI: 10.1099/ijsem.0.003834] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Munusamy Madhaiyan
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore
| | | | - Jochen Blom
- Bioinformatics and Systems Biology, Justus Liebig University, Giessen, Germany
| | - Theo H. M. Smits
- Environmental Genomics and Systems Biology Research Group, Institute of Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wadenswil, Switzerland
| | - Fabio Rezzonico
- Environmental Genomics and Systems Biology Research Group, Institute of Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wadenswil, Switzerland
| | - Soo-Jin Kim
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Hang-Yeon Weon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Soon-Wo Kwon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - William B. Whitman
- Department of Microbiology, 527 Biological Sciences Building, University of Georgia, Athens, GA 30602-2605, USA
| | - Lianghui Ji
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore
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10
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Llacsa LX, Solis-Castro RL, Mialhe E, García-Seminario R. Metagenomic Analysis of the Bacterial and Fungal Community Associated to the Rhizosphere of Tabebuia chrysantha and T. billbergii. Curr Microbiol 2019; 76:1073-1080. [PMID: 31250091 DOI: 10.1007/s00284-019-01725-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 06/20/2019] [Indexed: 10/26/2022]
Abstract
The rhizosphere of plants contains a diversity of microorganisms, some of which play an important role in the growth and development of the host plant. In this work, the diversity of fungi and bacteria associated to the rhizosphere of Tabebuia chrysantha and T. billbergii plants was analyzed. The molecular identification was performed by sequencing the ITS and 16S rDNA for fungi and bacteria, respectively. The analysis of the rDNA sequences of the rhizosphere of T. billergii showed that for domain Eukaria, the most abundant phyla were Glomeromycota (56%) and Ascomycota (39%), and for domain Bacteria, the phylum Firmicutes (19.17%) was the most abundant followed by Actinobacteria (14.90%) and Proteobacteria (8.94%). In the rhizosphere of T. chrysantha the most abundant phylum of Eukaria was Ascomycota (98%), and for Bacteria the most representative phyla were Proteobacteria (18.61%) and Actinobacteria (11.93%). A diversity of genera and species of fungi and bacteria was observed, to be more significant in T. chrysantha than T. billbergii. The taxonomic assignment of metagenomic sequences revealed a homology associated with genomic sequences of 546 bacteria and 147 fungi in T. chrysantha and 154 bacteria and 122 fungi in T. billbergii.
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Affiliation(s)
| | - Rosa L Solis-Castro
- Departamento de Biología y Bioquímica, Universidad Nacional de Tumbes, Av. Universitaria s/n, Pampa Grande, Tumbes, Peru. .,Universidade de São Paulo, Av. Linneu Prestes 1374, Butantã, São Paulo, SP, Brazil.
| | - Eric Mialhe
- Inca Biotec, Jr. Filipinas 212, Tumbes, Peru
| | - Ramón García-Seminario
- Departamento de Agronomía, Facultad de Ciencias Agrarias, Universidad Nacional de Tumbes, Av. Universitaria s/n, Pampa Grande, Tumbes, Peru
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11
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Taulé C, Luizzi H, Beracochea M, Mareque C, Platero R, Battistoni F. The Mo- and Fe-nitrogenases of the endophyte Kosakonia sp. UYSO10 are necessary for growth promotion of sugarcane. ANN MICROBIOL 2019. [DOI: 10.1007/s13213-019-01466-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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12
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Rho H, Hsieh M, Kandel SL, Cantillo J, Doty SL, Kim SH. Do Endophytes Promote Growth of Host Plants Under Stress? A Meta-Analysis on Plant Stress Mitigation by Endophytes. MICROBIAL ECOLOGY 2018; 75:407-418. [PMID: 28840330 DOI: 10.1007/s00248-017-1054-3] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 08/07/2017] [Indexed: 05/18/2023]
Abstract
Endophytes are microbial symbionts living inside plants and have been extensively researched in recent decades for their functions associated with plant responses to environmental stress. We conducted a meta-analysis of endophyte effects on host plants' growth and fitness in response to three abiotic stress factors: drought, nitrogen deficiency, and excessive salinity. Ninety-four endophyte strains and 42 host plant species from the literature were evaluated in the analysis. Endophytes increased biomass accumulation of host plants under all three stress conditions. The stress mitigation effects by endophytes were similar among different plant taxa or functional groups with few exceptions; eudicots and C4 species gained more biomass than monocots and C3 species with endophytes, respectively, under drought conditions. Our analysis supports the effectiveness of endophytes in mitigating drought, nitrogen deficiency, and salinity stress in a wide range of host species with little evidence of plant-endophyte specificity.
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Affiliation(s)
- Hyungmin Rho
- School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA, 98195-2100, USA.
| | - Marian Hsieh
- School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA, 98195-2100, USA
| | - Shyam L Kandel
- School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA, 98195-2100, USA
| | - Johanna Cantillo
- Department of Biology, University of Washington, Seattle, WA, 98195-1800, USA
| | - Sharon L Doty
- School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA, 98195-2100, USA
| | - Soo-Hyung Kim
- School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA, 98195-2100, USA
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Madhaiyan M, Alex THH, Cho H, Kim SJ, Weon HY, Kwon SW, Whitman WB, Ji L. Sphingomonas jatrophae sp. nov. and Sphingomonas carotinifaciens sp. nov., two yellow-pigmented endophytes isolated from stem tissues of Jatropha curcas L. Int J Syst Evol Microbiol 2017; 67:5150-5158. [PMID: 29087271 DOI: 10.1099/ijsem.0.002434] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Two yellow-pigmented isolates, S5-249T and L9-754T, originating from surface-sterilized plant tissues of Jatropha curcas L. (Jatropha) cultivars were characterized using a polyphasic taxonomic approach. Strains S5-249T and L9-754T had 16S rRNA genes sharing 94.2 % sequence similarity with each other and 91.6-97.2 % sequence similarity with those of other species in the genus Sphingomonas, suggesting that they represent two potentially novel species. The 16S rRNA gene sequences of strains S5-249T and L9-754T shared the highest similarity to that of Sphingomonas sanguinis NBRC 13937T (96.1 and 97.2 %, respectively). The genomic DNA G+C contents of strains S5-249T and L9-754T were 66.9 and 68.5 mol%, respectively. The respiratory quinone was determined to be Q-10, and the major polyamine was homospermidine. Strains S5-249T and L9-754T contained summed feature 7 (comprising C18 : 1ω7c, C18 : 1ω9t and/or C18 : 1ω12t), C16 : 1, C14 : 0 2-OH and summed feature 4 (C16 : 1ω7t, iso-C15 : 0 2-OH and C16 : 1ω7c) as the major cellular fatty acids. The predominant polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and sphingoglycolipid. The average nucleotide identity (ANI) values between S. sanguinis NBRC 13937T and the two type strains (S5-249T and L9-754T) were 72.31 and 77.73 %, respectively. Digital DNA-DNA hybridization (dDDH) studies between the novel strains (S5-249T and L9-754T) and other species of the genus Sphingomonas were well below the thresholds used to discriminate between bacterial species. The results of dDDH and physiological tests allowed genotypic and phenotypic differentiation of the strains from each other as well as from the species of the genus Sphingomonas with validly published names. These data strongly support the classification of the strains as representatives of novel species, for which we propose the names Sphingomonas jatrophae sp. nov. (type strain S5-249T=DSM 27345T=KACC 17593T) and Sphingomonas carotinifaciens sp. nov. (type strain L9-754T=DSM 27347T=KACC 17595T).
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Affiliation(s)
- Munusamy Madhaiyan
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, National University of Singapore, 1 Research Link, Singapore 117604, Singapore
| | - Tan Hian Hwee Alex
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, National University of Singapore, 1 Research Link, Singapore 117604, Singapore
| | - Hayoung Cho
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Soo-Jin Kim
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Hang-Yeon Weon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - Soon-Wo Kwon
- Agricultural Microbiology Division, National Institute of Agricultural Science, Rural Development Administration, Wanju-gun, Jeollabuk-do 55365, Republic of Korea
| | - William B Whitman
- Department of Microbiology, University of Georgia, 527 Biological Sciences Building, Athens, GA 30602-2605, USA
| | - Lianghui Ji
- Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, National University of Singapore, 1 Research Link, Singapore 117604, Singapore
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Manipulation of Auxin Response Factor 19 affects seed size in the woody perennial Jatropha curcas. Sci Rep 2017; 7:40844. [PMID: 28102350 PMCID: PMC5244365 DOI: 10.1038/srep40844] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 12/09/2016] [Indexed: 12/05/2022] Open
Abstract
Seed size is a major determinant of seed yield but few is known about the genetics controlling of seed size in plants. Phytohormones cytokinin and brassinosteroid were known to be involved in the regulation of herbaceous plant seed development. Here we identified a homolog of Auxin Response Factor 19 (JcARF19) from a woody plant Jatropha curcas and genetically demonstrated its functions in controlling seed size and seed yield. Through Virus Induced Gene Silencing (VIGS), we found that JcARF19 was a positive upstream modulator in auxin signaling and may control plant organ size in J. curcas. Importantly, transgenic overexpression of JcARF19 significantly increased seed size and seed yield in plants Arabidopsis thaliana and J. curcas, indicating the importance of auxin pathway in seed yield controlling in dicot plants. Transcripts analysis indicated that ectopic expression of JcARF19 in J. curcas upregulated auxin responsive genes encoding essential regulators in cell differentiation and cytoskeletal dynamics of seed development. Our data suggested the potential of improving seed traits by precisely engineering auxin signaling in woody perennial plants.
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15
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Swamy CT, Gayathri D, Devaraja TN, Bandekar M, D'Souza SE, Meena RM, Ramaiah N. Plant growth promoting potential and phylogenetic characteristics of a lichenized nitrogen fixing bacterium, Enterobacter cloacae. J Basic Microbiol 2016; 56:1369-1379. [PMID: 27273065 DOI: 10.1002/jobm.201600197] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 05/16/2016] [Indexed: 11/11/2022]
Abstract
Lichens are complex symbiotic association of mycobionts, photobionts, and bacteriobionts, including chemolithotropic bacteria. In the present study, 46 lichenized bacteria were isolated by conventional and enrichment culture methods on nitrogen-free bromothymol blue (NFb) medium. Only 11 of the 46 isolates fixed nitrogen on NFb and had reduced acetylene. All these 11 isolates had also produced siderophore and 10 of them the IAA. Further, ammonia production was recorded from nine of these nitrogen fixers (NF). On molecular characterization, 16 S rRNA sequencing recorded that, nine NF belonged to Proteobacteria, within Gammaproteobacteria, and were closely related to Enterobacter sp. with a maximum similarity to Enterobacter cloacae. Each one of our NF isolates was aligned closely to Enterobacter pulveris strain E443, Cronobacter sakazakii strain PNP8 and Providencia rettgeri strain ALK058. Notably, a few strains we examined found to possess plant growth promoting properties. This is the first report of Enterobacter sp. from lichens which may be inhabit lichen thalli extrinsically or intrinsically.
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Affiliation(s)
| | - Devaraja Gayathri
- Department of Studies in Microbiology, Davangere University, Shivagangothri, Davangere, Karnataka, India
| | | | - Mandar Bandekar
- CSIR-National Institute of Oceanography, Dona Paula, Goa, India
| | | | - Ram Murti Meena
- CSIR-National Institute of Oceanography, Dona Paula, Goa, India
| | - Nagappa Ramaiah
- CSIR-National Institute of Oceanography, Dona Paula, Goa, India
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16
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Madhaiyan M, Alex THH, Ngoh ST, Prithiviraj B, Ji L. Leaf-residing Methylobacterium species fix nitrogen and promote biomass and seed production in Jatropha curcas. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:222. [PMID: 26697111 PMCID: PMC4687150 DOI: 10.1186/s13068-015-0404-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 11/30/2015] [Indexed: 05/06/2023]
Abstract
BACKGROUND Jatropha curcas L. (Jatropha) is a potential biodiesel crop that can be cultivated on marginal land because of its strong tolerance to drought and low soil nutrient content. However, seed yield remains low. To enhance the commercial viability and green index of Jatropha biofuel, a systemic and coordinated approach must be adopted to improve seed oil and biomass productivity. Here, we present our investigations on the Jatropha-associated nitrogen-fixing bacteria with an aim to understand and exploit the unique biology of this plant from the perspective of plant-microbe interactions. RESULTS An analysis of 1017 endophytic bacterial isolates derived from different parts of Jatropha revealed that diazotrophs were abundant and diversely distributed into five classes belonging to α, β, γ-Proteobacteria, Actinobacteria and Firmicutes. Methylobacterium species accounted for 69.1 % of endophytic bacterial isolates in leaves and surprisingly, 30.2 % which were able to fix nitrogen that inhabit in leaves. Among the Methylobacterium isolates, strain L2-4 was characterized in detail. Phylogenetically, strain L2-4 is closely related to M. radiotolerans and showed strong molybdenum-iron dependent acetylene reduction (AR) activity in vitro and in planta. Foliar spray of L2-4 led to successful colonization on both leaf surface and in internal tissues of systemic leaves and significantly improved plant height, leaf number, chlorophyll content and stem volume. Importantly, seed production was improved by 222.2 and 96.3 % in plants potted in sterilized and non-sterilized soil, respectively. Seed yield increase was associated with an increase in female-male flower ratio. CONCLUSION The ability of Methylobacterium to fix nitrogen and colonize leaf tissues serves as an important trait for Jatropha. This bacteria-plant interaction may significantly contribute to Jatropha's tolerance to low soil nutrient content. Strain L2-4 opens a new possibility to improve plant's nitrogen supply from the leaves and may be exploited to significantly improve the productivity and Green Index of Jatropha biofuel.
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Affiliation(s)
- Munusamy Madhaiyan
- />Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604 Singapore
| | - Tan Hian Hwee Alex
- />Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604 Singapore
| | - Si Te Ngoh
- />Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604 Singapore
| | - Bharath Prithiviraj
- />Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, OK 73401 USA
| | - Lianghui Ji
- />Biomaterials and Biocatalysts Group, Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore, 117604 Singapore
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17
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Gunawardana M, Hyde ER, Lahmeyer S, Dorsey BL, La Val TP, Mullen M, Yoo J, Knight R, Baum MM. Euphorbia plant latex is inhabited by diverse microbial communities. AMERICAN JOURNAL OF BOTANY 2015; 102:1966-1977. [PMID: 26656131 DOI: 10.3732/ajb.1500223] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 10/12/2015] [Indexed: 06/05/2023]
Abstract
PREMISE OF THE STUDY The antimicrobial properties and toxicity of Euphorbia plant latex should make it a hostile environment to microbes. However, when specimens from Euphorbia spp. were propagated in tissue culture, microbial growth was observed routinely, raising the question whether the latex of this diverse plant genus can be a niche for polymicrobial communities. METHODS Latex from a phylogenetically diverse set of Euphorbia species was collected and genomic microbial DNA extracted. Deep sequencing of bar-coded amplicons from taxonomically informative gene fragments was used to measure bacterial and fungal species richness, evenness, and composition. KEY RESULTS Euphorbia latex was found to contain unexpectedly complex bacterial (mean: 44.0 species per sample; 9 plants analyzed) and fungal (mean: 20.9 species per sample; 22 plants analyzed) communities using culture-independent methods. Many of the identified taxa are known plant endophytes, but have not been previously found in latex. CONCLUSIONS Our results suggest that Euphorbia plant latex, a putatively hostile antimicrobial environment, unexpectedly supports diverse bacterial and fungal communities. The ecological roles of these microorganisms and potential interactions with their host plants are unknown and warrant further research.
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Affiliation(s)
- Manjula Gunawardana
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, California 91016 USA
| | - Embriette R Hyde
- BioFrontiers Institute, the University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, Colorado 80303 USA; present address: Department of Pediatrics, the University of California at San Diego, 9600 Gilman Drive, La Jolla, California 92093 USA
| | - Sean Lahmeyer
- The Huntington Library, Art Collections, and Botanical Gardens, 1151 Oxford Road, San Marino, California 91108 USA
| | - Brian L Dorsey
- The Huntington Library, Art Collections, and Botanical Gardens, 1151 Oxford Road, San Marino, California 91108 USA
| | - Taylor P La Val
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, California 91016 USA
| | - Madeline Mullen
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, California 91016 USA
| | - Jennifer Yoo
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, California 91016 USA
| | - Rob Knight
- BioFrontiers Institute, the University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, Colorado 80303 USA; present address: Department of Pediatrics, the University of California at San Diego, 9600 Gilman Drive, La Jolla, California 92093 USA Departments of Chemistry and Biochemistry and Computer Science, the University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, Colorado 80303 USA; present address: Departments of Pediatrics and Computer Science and Engineering, the University of California at San Diego, 9600 Gilman Drive, La Jolla, California 92093 USA
| | - Marc M Baum
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, California 91016 USA
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18
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Draft Genome Sequence of Methylobacterium sp. Strain L2-4, a Leaf-Associated Endophytic N-Fixing Bacterium Isolated from Jatropha curcas L. GENOME ANNOUNCEMENTS 2014; 2:2/6/e01306-14. [PMID: 25502683 PMCID: PMC4263845 DOI: 10.1128/genomea.01306-14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Methylobacterium sp. strain L2-4 is an efficient nitrogen-fixing leaf colonizer of biofuel crop Jatropha curcas. This strain is able to greatly improve the growth and seed yield of Jatropha curcas and is the second reported genome sequence of plant growth-promoting bacteria isolated from Jatropha curcas.
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19
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Sivakumar K, Mukherjee M, Cheng HI, Zhang Y, Ji L, Cao B. Surface display of roGFP for monitoring redox status of extracellular microenvironments inShewanella oneidensisbiofilms. Biotechnol Bioeng 2014; 112:512-20. [DOI: 10.1002/bit.25471] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 09/04/2014] [Accepted: 09/15/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Krishnakumar Sivakumar
- Singapore Centre on Environmental Life Science Engineering; Nanyang Technological University; Singapore 637551 Singapore
- Interdisciplinary Graduate School; Nanyang Technological University; Singapore
| | - Manisha Mukherjee
- Singapore Centre on Environmental Life Science Engineering; Nanyang Technological University; Singapore 637551 Singapore
- School of Civil and Environmental Engineering; Nanyang Technological University; Singapore 637551 Singapore
| | | | - Yingdan Zhang
- Singapore Centre on Environmental Life Science Engineering; Nanyang Technological University; Singapore 637551 Singapore
- Interdisciplinary Graduate School; Nanyang Technological University; Singapore
| | | | - Bin Cao
- Singapore Centre on Environmental Life Science Engineering; Nanyang Technological University; Singapore 637551 Singapore
- School of Civil and Environmental Engineering; Nanyang Technological University; Singapore 637551 Singapore
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Complete Genome Sequence of Enterobacter sp. Strain R4-368, an Endophytic N-Fixing Gammaproteobacterium Isolated from Surface-Sterilized Roots of Jatropha curcas L. GENOME ANNOUNCEMENTS 2013; 1:1/4/e00544-13. [PMID: 23908287 PMCID: PMC3731841 DOI: 10.1128/genomea.00544-13] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Enterobacter sp. strain R4-368 is one of the few characterized Jatropha endophytic diazotrophic bacteria and was isolated from surface-sterilized roots. This bacterium shows strong growth-promoting effects, being able to increase plant biomass and seed yields. Enterobacter sp. R4-368 is the second fully sequenced diazotrophic Enterobacter species. The sequence information shall facilitate the elucidation of the molecular mechanisms of plant growth promotion, nitrogen fixation in nonlegume plant species, and evolution of biological nitrogen fixation systems.
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