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Castronovo LM, Vassallo A, Mengoni A, Miceli E, Bogani P, Firenzuoli F, Fani R, Maggini V. Medicinal Plants and Their Bacterial Microbiota: A Review on Antimicrobial Compounds Production for Plant and Human Health. Pathogens 2021; 10:pathogens10020106. [PMID: 33498987 PMCID: PMC7911374 DOI: 10.3390/pathogens10020106] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 12/15/2022] Open
Abstract
Medicinal plants (MPs) have been used since antiquity in traditional and popular medicine, and they represent a very important source of bioactive molecules, including antibiotic, antiviral, and antifungal molecules. Such compounds are often of plant origin, but in some cases, an origin or a modification from plant microbiota has been shown. Actually, the research continues to report the production of bioactive molecules by plants, but the role of plant–endophytic interaction is emerging. Classic examples are mainly concerned with fungal endophytes; however, it has been recently shown that bacterial endophytes can also play an important role in influencing the plant metabolism related to the synthesis of bioactive compounds. In spite of this, a deep investigation on the power of MP bacterial endophytes is lacking. Here, an overview of the studies on MP bacterial microbiota and its role in the production of plant antimicrobial compounds contributing to prime host defense system and representing a huge resource for biotech and therapeutic applications is provided.
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Affiliation(s)
- Lara Mitia Castronovo
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
| | - Alberto Vassallo
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
| | - Alessio Mengoni
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
| | - Elisangela Miceli
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
| | - Patrizia Bogani
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
| | - Fabio Firenzuoli
- CERFIT, Research and Innovation Center in Phytotherapy and Integrated Medicine, Tuscany Region, Careggi University Hospital, 50141 Florence, Italy;
| | - Renato Fani
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
- Correspondence: (R.F.); (V.M.); Tel.: +39-0554574742 (R.F.); +39-0554574731 (V.M.)
| | - Valentina Maggini
- Department of Biology, University of Florence, 50019 Florence, Italy; (L.M.C.); (A.V.); (A.M.); (E.M.); (P.B.)
- CERFIT, Research and Innovation Center in Phytotherapy and Integrated Medicine, Tuscany Region, Careggi University Hospital, 50141 Florence, Italy;
- Correspondence: (R.F.); (V.M.); Tel.: +39-0554574742 (R.F.); +39-0554574731 (V.M.)
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Kushwaha P, Kashyap PL, Bhardwaj AK, Kuppusamy P, Srivastava AK, Tiwari RK. Bacterial endophyte mediated plant tolerance to salinity: growth responses and mechanisms of action. World J Microbiol Biotechnol 2020; 36:26. [PMID: 31997078 DOI: 10.1007/s11274-020-2804-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 01/22/2020] [Indexed: 12/18/2022]
Abstract
Salinity stress is one of the key constraints for sustainable crop production. It has gained immense importance in the backdrop of climate change induced imbalanced terrestrial water budgets. The traditional agronomic approaches and breeding salt-tolerant genotypes have often proved insufficient to alleviate salinity stress. Newer approaches like the use of bacterial endophytes associated with agricultural crops have occupied center place recently, owing to their advantageous role in improving crop growth, health and yield. Research evidences have revealed that bacterial endophytes can promote plant growth by accelerating availability of mineral nutrients, helping in production of phytohormones, siderophores, and enzymes, and also by activating systemic resistance against insect pest and pathogens in plants. These research developments have opened an innovative boulevard in agriculture for capitalizing bacterial endophytes, single species or consortium, to enhance plant salt tolerance capabilities, and ultimately lead to translational refinement of crop-production business under salty environments. This article reviews the latest research progress on the identification and functional characterization of salt tolerant endophytic bacteria and illustrates various mechanisms triggered by them for plant growth promotion under saline environment.
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Affiliation(s)
- Prity Kushwaha
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Uttar Pradesh, Mau, 275103, India
| | - Prem Lal Kashyap
- ICAR-Indian Institute of Wheat and Barley Research (IIWBR), Karnal, 132001, India.
| | - Ajay Kumar Bhardwaj
- ICAR-Central Soil Salinity Research Institute (CSSRI), Karnal, 132001, India.
| | - Pandiyan Kuppusamy
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Uttar Pradesh, Mau, 275103, India
| | - Alok Kumar Srivastava
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Uttar Pradesh, Mau, 275103, India
| | - Rajesh Kumar Tiwari
- AMITY University, Uttar Pradesh Lucknow Campus, Malhaur, Gomti Nagar Extension, Lucknow, 227105, India
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Kang W, Xu L, Jiang Z, Shi S. Genetic diversity and symbiotic efficiency difference of endophytic rhizobia of Medicago sativa. Can J Microbiol 2018; 65:68-83. [PMID: 30273494 DOI: 10.1139/cjm-2018-0158] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Research on rhizobium diversity has paved the way for diversification of rhizobial germplasm resources. Seventy-three endophytic bacterial isolates were collected from seven tissues of five alfalfa cultivars in three geographic locations in Gansu, China. Restriction fragment length polymorphism (RFLP) fingerprinting of 16S rRNA and analysis of concatenated sequence of three housekeeping genes (atpD, glnII, and recA) and two symbiotic genes (nodC and nifH) were used for strain identification. Results showed that the endophytic strains were genetically diverse at different taxonomic levels, and Ensifer meliloti (31) and Agrobacterium radiobacter (12) are common Medicago sativa endophytic bacteria in Gansu, China. The nifH genes (97%-98% sequence identity) of E. meliloti strains were more diverse than the nodC genes (99%-100% sequence identity), even though the strains evolved from a common ancestor. The degree of dispersion of symbiotic phenotypes of E. meliloti strains on M. sativa 'Gannong No. 3', 'Gannong No. 9', and 'Qingshui' was much less than that on M. sativa 'Longzhong' and 'WL168HQ'. This suggested that the symbiotic efficiency of E. meliloti strains on the former three alfalfa cultivars was similar but on the latter two was discrepant. Their symbiotic efficiency differed primarily according to alfalfa cultivars and, to a lesser extent, to the tested strains, indicating the difference in the sensitivity of different alfalfa cultivars to rhizobial strains.
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Affiliation(s)
- Wenjuan Kang
- a College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, P.R. China
| | - Lin Xu
- b College of Agriculture and Biotechnology, Hexi University, Zhangye 734000, P.R. China
| | - Zhehao Jiang
- a College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, P.R. China
| | - Shangli Shi
- a College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, P.R. China.,c Key Laboratory of Grassland Ecosystem of Ministry of Education, Lanzhou 730070, P.R. China
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Daddiego L, Bianco L, Capodicasa C, Carbone F, Dalmastri C, Daroda L, Del Fiore A, De Rossi P, Di Carli M, Donini M, Lopez L, Mengoni A, Paganin P, Perrotta G, Bevivino A. Omics approaches on fresh-cut lettuce reveal global molecular responses to sodium hypochlorite and peracetic acid treatment. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:737-750. [PMID: 28675480 DOI: 10.1002/jsfa.8521] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 06/26/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Lettuce is a leafy vegetable that is extensively commercialized as a ready-to-eat product because of its widespread use in human nutrition as salad. It is well known that washing treatments can severely affect the quality and shelf-life of ready-to-eat vegetables. The study presented here evaluated the effect of two washing procedures on fresh-cut lettuce during storage. RESULTS An omics approach was applied to reveal global changes at molecular level induced by peracetic acid washing in comparison with sodium hypochlorite treatment. Microbiological analyses were also performed to quantify total bacterial abundance and composition. The study revealed wide metabolic alterations induced by the two sanitizers. In particular, transcriptomic and proteomic analyses pointed out a number of transcripts and proteins differentially accumulated in response to peracetic acid washing, mainly occurring on the first day of storage. In parallel, different microbiota composition and significant reduction in total bacterial load following washing were also observed. CONCLUSION The results provide useful information for the fresh-cut industry to select an appropriate washing procedure preserving fresh-like attributes as much as possible during storage of the end product. Molecular evidence indicated peracetic acid to be a valid alternative to sodium hypochlorite as sanitizer solution. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Loretta Daddiego
- Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Trisaia Research Center, Rotondella, MT, Italy
| | - Linda Bianco
- Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Trisaia Research Center, Rotondella, MT, Italy
| | - Cristina Capodicasa
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Fabrizio Carbone
- Council for Agricultural Research and Economics (CREA), Research Centre for Olive, Citrus and Tree Fruit, Rende, (CS), Italy
| | - Claudia Dalmastri
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Lorenza Daroda
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Antonella Del Fiore
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Patrizia De Rossi
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Mariasole Di Carli
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Marcello Donini
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Loredana Lopez
- Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Trisaia Research Center, Rotondella, MT, Italy
| | - Alessio Mengoni
- Department of Biology, University of Florence, Florence, Italy
| | - Patrizia Paganin
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
| | - Gaetano Perrotta
- Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Trisaia Research Center, Rotondella, MT, Italy
| | - Annamaria Bevivino
- Department of Sustainability and Productivity of Territorial Systems, Biotechnology and Agro-Industry Division, ENEA Casaccia Research Center, Rome, Italy
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Merlot S, Sanchez Garcia de la Torre V, Hanikenne M. Physiology and Molecular Biology of Trace Element Hyperaccumulation. AGROMINING: FARMING FOR METALS 2018. [DOI: 10.1007/978-3-319-61899-9_6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Jiang YF, Ling J, Dong JD, Chen B, Zhang YY, Zhang YZ, Wang YS. Illumina-based analysis the microbial diversity associated with Thalassia hemprichii in Xincun Bay, South China Sea. ECOTOXICOLOGY (LONDON, ENGLAND) 2015; 24:1548-1556. [PMID: 26092035 DOI: 10.1007/s10646-015-1511-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/08/2015] [Indexed: 06/04/2023]
Abstract
In order to increase our understanding of the microbial diversity associated with seagrass Thalassia hemprichii in Xincun Bay, South China Sea, 16S rRNA gene was identified by highthrough sequencing method. Bacteria associated with seagrass T. hemprichii belonged to 37 phyla, 99 classes. The diversity of bacteria associated with seagrass was similar among the geographically linked coastal locations of Xincun Bay. Proteobacteria was the dominant bacteria and the α-proteobacteria had adapted to the seagrass ecological niche. As well, α-proteobacteria and Pseudomonadales were associated microflora in seagrass meadows, but the interaction between the bacteria and plant is needed to further research. Burkholderiales and Verrucomicrobiae indicated the influence of the bay from anthropogenic activities. Further, Cyanobacteria could imply the difference of the nutrient conditions in the sites. γ-proteobacteria, Desulfobacterales and Pirellulales played a role in the cycle of sulfur, organic mineralization and meadow ecosystem, respectively. In addition, the less abundance bacteria species have key functions in the seagrass meadows, but there is lack knowledge of the interaction of the seagrass and less abundance bacteria species. Microbial communities can response to surroundings and play key functions in the biochemical cycle.
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Affiliation(s)
- Yu-Feng Jiang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya, 572000, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Juan Ling
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya, 572000, China
| | - Jun-De Dong
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
- Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya, 572000, China.
| | - Biao Chen
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya, 572000, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yan-Ying Zhang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya, 572000, China
| | - Yuan-Zhou Zhang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya, 572000, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - You-Shao Wang
- State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
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Maida I, Chiellini C, Mengoni A, Bosi E, Firenzuoli F, Fondi M, Fani R. Antagonistic interactions between endophytic cultivable bacterial communities isolated from the medicinal plantEchinacea purpurea. Environ Microbiol 2015; 18:2357-65. [DOI: 10.1111/1462-2920.12911] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 05/15/2015] [Accepted: 05/16/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Isabel Maida
- Department of Biology; University of Florence; Via Madonna del Piano 6 Sesto Fiorentino Florence I-50019 Italy
| | - Carolina Chiellini
- Department of Biology; University of Florence; Via Madonna del Piano 6 Sesto Fiorentino Florence I-50019 Italy
- CRA-ABP Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria; Centro di ricerca per l'Agrobiologia e la Pedologia; Piazza M. D'Azeglio 30 Firenze FI 50121 Italy
| | - Alessio Mengoni
- Department of Biology; University of Florence; Via Madonna del Piano 6 Sesto Fiorentino Florence I-50019 Italy
| | - Emanuele Bosi
- Department of Biology; University of Florence; Via Madonna del Piano 6 Sesto Fiorentino Florence I-50019 Italy
| | - Fabio Firenzuoli
- Center for Integrative Medicine; Careggi University Hospital; University of Florence; Florence Italy
| | - Marco Fondi
- Department of Biology; University of Florence; Via Madonna del Piano 6 Sesto Fiorentino Florence I-50019 Italy
| | - Renato Fani
- Department of Biology; University of Florence; Via Madonna del Piano 6 Sesto Fiorentino Florence I-50019 Italy
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Shen SY, Fulthorpe R. Seasonal variation of bacterial endophytes in urban trees. Front Microbiol 2015; 6:427. [PMID: 26042095 PMCID: PMC4437045 DOI: 10.3389/fmicb.2015.00427] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 04/22/2015] [Indexed: 02/01/2023] Open
Abstract
Bacterial endophytes, non-pathogenic bacteria residing within plants, contribute to the growth and development of plants and their ability to adapt to adverse conditions. In order to fully exploit the capabilities of these bacteria, it is necessary to understand the extent to which endophytic communities vary between species and over time. The endophytes of Acer negundo, Ulmus pumila, and Ulmus parvifolia were sampled over three seasons and analyzed using culture dependent and independent methods (culture on two media, terminal restriction fragment length polymorphism, and tagged pyrosequencing of 16S ribosomal amplicons). The majority of culturable endophytes isolated were Actinobacteria, and all the samples harbored Bacillus, Curtobacterium, Frigoribacterium, Methylobacterium, Paenibacilllus, and Sphingomonas species. Regardless of culture medium used, only the culturable communities obtained in the winter for A. negundo could be distinguished from those of Ulmus spp. In contrast, the nonculturable communities were dominated by Proteobacteria and Actinobacteria, particularly Erwinia, Ralstonia, and Sanguibacter spp. The presence and abundance of various bacterial classes and phyla changed with the changing seasons. Multivariate analysis on the culture independent data revealed significant community differences between the endophytic communities of A. negundo and Ulmus spp., but overall season was the main determinant of endophytic community structure. This study suggests studies on endophytic populations of urban trees should expect to find significant seasonal and species-specific community differences and sampling should proceed accordingly.
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Affiliation(s)
- Shu Yi Shen
- Department of Physical and Environmental Sciences, University of Toronto Scarborough Toronto, ON, Canada
| | - Roberta Fulthorpe
- Department of Physical and Environmental Sciences, University of Toronto Scarborough Toronto, ON, Canada
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Sheoran N, Valiya Nadakkakath A, Munjal V, Kundu A, Subaharan K, Venugopal V, Rajamma S, Eapen SJ, Kumar A. Genetic analysis of plant endophytic Pseudomonas putida BP25 and chemo-profiling of its antimicrobial volatile organic compounds. Microbiol Res 2015; 173:66-78. [PMID: 25801973 DOI: 10.1016/j.micres.2015.02.001] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 01/31/2015] [Accepted: 02/07/2015] [Indexed: 11/19/2022]
Abstract
Black pepper associated bacterium BP25 was isolated from root endosphere of apparently healthy cultivar Panniyur-5 that protected black pepper against Phytophthora capsici and Radopholus similis - the major production constraints. The bacterium was characterized and mechanisms of its antagonistic action against major pathogens are elucidated. The polyphasic phenotypic analysis revealed its identity as Pseudomonas putida. Multi locus sequence typing revealed that the bacterium shared gene sequences with several other isolates representing diverse habitats. Tissue localization assays exploiting green fluorescence protein expression clearly indicated that PpBP25 endophytically colonized not only its host plant - black pepper, but also other distantly related plants such as ginger and arabidopsis. PpBP25 colonies could be enumerated from internal tissues of plants four weeks post inoculation indicated its stable establishment and persistence in the plant system. The bacterium inhibited broad range of pathogens such as Phytophthora capsici, Pythium myriotylum, Giberella moniliformis, Rhizoctonia solani, Athelia rolfsii, Colletotrichum gloeosporioides and plant parasitic nematode, Radopholus similis by its volatile substances. GC/MS based chemical profiling revealed presence of Heneicosane; Tetratetracontane; Pyrrolo [1,2-a] pyrazine-1,4-dione, hexahydro-3-(2-methylpropyl); Tetracosyl heptafluorobutyrate; 1-3-Eicosene, (E)-; 1-Heneicosanol; Octadecyl trifluoroacetate and 1-Pentadecene in PpBP25 metabolite. Dynamic head space GC/MS analysis of airborne volatiles indicated the presence of aromatic compounds such as 1-Undecene;Disulfide dimethyl; Pyrazine, methyl-Pyrazine, 2,5-dimethyl-; Isoamyl alcohol; Pyrazine, methyl-; Dimethyl trisulfide, etc. The work paved way for profiling of broad spectrum antimicrobial VOCs in endophytic PpBP25 for crop protection.
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Affiliation(s)
- Neelam Sheoran
- Division of Plant Pathology, ICAR - Indian Agricultural Research Institute, New Delhi, India
| | | | - Vibhuti Munjal
- Division of Plant Pathology, ICAR - Indian Agricultural Research Institute, New Delhi, India
| | - Aditi Kundu
- Division of Agricultural Chemicals, ICAR - Indian Agricultural Research Institute, New Delhi, India
| | - Kesavan Subaharan
- Division of Crop Protection, ICAR - Central Plantation Crops Research Institute, Kasaragod, India
| | - Vibina Venugopal
- Division of Crop Protection, ICAR - Central Plantation Crops Research Institute, Kasaragod, India
| | - Suseelabhai Rajamma
- Division of Crop Protection, ICAR - Indian Institute of Spices Research, Kozhikode, India
| | - Santhosh J Eapen
- Division of Crop Protection, ICAR - Indian Institute of Spices Research, Kozhikode, India
| | - Aundy Kumar
- Division of Plant Pathology, ICAR - Indian Agricultural Research Institute, New Delhi, India.
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Chen L, Luo S, Chen J, Wan Y, Li X, Liu C, Liu F. A comparative analysis of endophytic bacterial communities associated with hyperaccumulators growing in mine soils. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:7538-7547. [PMID: 24595752 DOI: 10.1007/s11356-014-2670-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
Interactions between endophytic bacterial communities and hyperaccumulators in heavy metal-polluted sites are not fully understood. In this study, the diversity of stem-associated endophytic bacterial communities of two hyperaccumulators (Solanum nigrum L. and Phytolacca acinosa Roxb.) growing in mine soils was investigated using molecular-based methods. The denaturing gradient gel electrophoresis (DGGE) analysis showed that the endophytic bacterial community structures were affected by both the level of heavy metal pollution and the plant species. Heavy metal in contaminated soil determined, to a large extent, the composition of the different endophytic bacterial communities in S. nigrum growing across soil series (five sampling spots, and the concentration of Cd is from 0.2 to 35.5 mg/kg). Detailed analysis of endophytic bacterial populations by cloning of 16S rRNA genes amplified from the stems of the two plants at the same site revealed a different composition. A total of 51 taxa at the genus level that included α-, β-, and γ-Proteobacteria (68.8% of the two libraries clones), Bacteroidetes (9.0% of the two libraries clones), Firmicutes (2.0% of the two libraries clones), Actinobacteria (16.4% of the two libraries clones), and unclassified bacteria (3.8% of the two libraries clones) were found in the two clone libraries. The most abundant genus in S. nigrum was Sphingomonas (23.35%), while Pseudomonas prevailed in P. acinosa (21.40%). These results suggest that both heavy metal pollution and plant species contribute to the shaping of the dynamic endophytic bacterial communities associated with stems of hyperaccumulators.
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Affiliation(s)
- Liang Chen
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, People's Republic of China
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Linking Bacterial Endophytic Communities to Essential Oils: Clues from Lavandula angustifolia Mill. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:650905. [PMID: 24971151 PMCID: PMC4058287 DOI: 10.1155/2014/650905] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 04/29/2014] [Indexed: 12/04/2022]
Abstract
Endophytic bacteria play a crucial role in plant life and are also drawing much attention for their capacity to produce bioactive compounds of relevant biotechnological interest. Here we present the characterisation of the cultivable endophytic bacteria of Lavandula angustifolia Mill.—a species used since antiquity for its therapeutic properties—since the production of bioactive metabolites from medical plants may reside also in the activity of bacterial endophytes through their direct production, PGPR activity on host, and/or elicitation of plant metabolism. Lavender tissues are inhabited by a tissue specific endophytic community dominated by Proteobacteria, highlighting also their difference from the rhizosphere environment where Actinobacteria and Firmicutes are also found. Leaves' endophytic community resulted as the most diverse from the other ecological niches. Overall, the findings reported here suggest: (i) the existence of different entry points for the endophytic community, (ii) its differentiation on the basis of the ecological niche variability, and (iii) a two-step colonization process for roots endophytes. Lastly, many isolates showed a strong inhibition potential against human pathogens and the molecular characterization demonstrated also the presence of not previously described isolates that may constitute a reservoir of bioactive compounds relevant in the field of pathogen control, phytoremediation, and human health.
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Bacci G, Pagoto E, Passaponti M, Vannocci P, Ugolini A, Mengoni A. Composition of supralittoral sediments bacterial communities in a Mediterranean island. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-014-0829-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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13
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Sessitsch A, Kuffner M, Kidd P, Vangronsveld J, Wenzel WW, Fallmann K, Puschenreiter M. The role of plant-associated bacteria in the mobilization and phytoextraction of trace elements in contaminated soils. SOIL BIOLOGY & BIOCHEMISTRY 2013; 60:182-194. [PMID: 23645938 PMCID: PMC3618436 DOI: 10.1016/j.soilbio.2013.01.012] [Citation(s) in RCA: 312] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 01/04/2013] [Accepted: 01/13/2013] [Indexed: 05/04/2023]
Abstract
Phytoextraction makes use of trace element-accumulating plants that concentrate the pollutants in their tissues. Pollutants can be then removed by harvesting plants. The success of phytoextraction depends on trace element availability to the roots and the ability of the plant to intercept, take up, and accumulate trace elements in shoots. Current phytoextraction practises either employ hyperaccumulators or fast-growing high biomass plants; the phytoextraction process may be enhanced by soil amendments that increase trace element availability in the soil. This review will focus on the role of plant-associated bacteria to enhance trace element availability in the rhizosphere. We report on the kind of bacteria typically found in association with trace element - tolerating or - accumulating plants and discuss how they can contribute to improve trace element uptake by plants and thus the efficiency and rate of phytoextraction. This enhanced trace element uptake can be attributed to a microbial modification of the absorptive properties of the roots such as increasing the root length and surface area and numbers of root hairs, or by increasing the plant availability of trace elements in the rhizosphere and the subsequent translocation to shoots via beneficial effects on plant growth, trace element complexation and alleviation of phytotoxicity. An analysis of data from literature shows that effects of bacterial inoculation on phytoextraction efficiency are currently inconsistent. Some key processes in plant-bacteria interactions and colonization by inoculated strains still need to be unravelled more in detail to allow full-scale application of bacteria assisted phytoremediation of trace element contaminated soils.
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Affiliation(s)
- Angela Sessitsch
- AIT Austrian Institute of Technology GmbH, Bioresources Unit, A-3430 Tulln, Austria
| | - Melanie Kuffner
- AIT Austrian Institute of Technology GmbH, Bioresources Unit, A-3430 Tulln, Austria
| | - Petra Kidd
- Instituto de Investigaciones Agrobiológicas de Galicia (IIAG), CSIC, Apdo. 122, 15780 Santiago de Compostela, Spain
| | - Jaco Vangronsveld
- Hasselt University, Centre for Environmental Sciences, B-3590 Diepenbeek, Belgium
| | - Walter W. Wenzel
- University of Natural Resources and Life Sciences Vienna, Department of Forest and Soil Sciences, A-3430 Tulln, Austria
| | - Katharina Fallmann
- AIT Austrian Institute of Technology GmbH, Bioresources Unit, A-3430 Tulln, Austria
- University of Natural Resources and Life Sciences Vienna, Department of Forest and Soil Sciences, A-3430 Tulln, Austria
| | - Markus Puschenreiter
- University of Natural Resources and Life Sciences Vienna, Department of Forest and Soil Sciences, A-3430 Tulln, Austria
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Izhaki I, Fridman S, Gerchman Y, Halpern M. Variability of Bacterial Community Composition on Leaves Between and Within Plant Species. Curr Microbiol 2012; 66:227-35. [DOI: 10.1007/s00284-012-0261-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 10/26/2012] [Indexed: 11/28/2022]
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Pini F, Frascella A, Santopolo L, Bazzicalupo M, Biondi EG, Scotti C, Mengoni A. Exploring the plant-associated bacterial communities in Medicago sativa L. BMC Microbiol 2012; 12:78. [PMID: 22607312 PMCID: PMC3412730 DOI: 10.1186/1471-2180-12-78] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Accepted: 05/20/2012] [Indexed: 11/10/2022] Open
Abstract
Background Plant-associated bacterial communities caught the attention of several investigators which study the relationships between plants and soil and the potential application of selected bacterial species in crop improvement and protection. Medicago sativa L. is a legume crop of high economic importance as forage in temperate areas and one of the most popular model plants for investigations on the symbiosis with nitrogen fixing rhizobia (mainly belonging to the alphaproteobacterial species Sinorhizobium meliloti). However, despite its importance, no studies have been carried out looking at the total bacterial community associated with the plant. In this work we explored for the first time the total bacterial community associated with M. sativa plants grown in mesocosms conditions, looking at a wide taxonomic spectrum, from the class to the single species (S. meliloti) level. Results Results, obtained by using Terminal-Restriction Fragment Length Polymorphism (T-RFLP) analysis, quantitative PCR and sequencing of 16 S rRNA gene libraries, showed a high taxonomic diversity as well as a dominance by members of the class Alphaproteobacteria in plant tissues. Within Alphaproteobacteria the families Sphingomonadaceae and Methylobacteriaceae were abundant inside plant tissues, while soil Alphaproteobacteria were represented by the families of Hyphomicrobiaceae, Methylocystaceae, Bradyirhizobiaceae and Caulobacteraceae. At the single species level, we were able to detect the presence of S. meliloti populations in aerial tissues, nodules and soil. An analysis of population diversity on nodules and soil showed a relatively low sharing of haplotypes (30-40%) between the two environments and between replicate mesocosms, suggesting drift as main force shaping S. meliloti population at least in this system. Conclusions In this work we shed some light on the bacterial communities associated with M. sativa plants, showing that Alphaproteobacteria may constitute an important part of biodiversity in this system, which includes also the well known symbiont S. meliloti. Interestingly, this last species was also found in plant aerial part, by applying cultivation-independent protocols, and a genetic diversity analysis suggested that population structure could be strongly influenced by random drift.
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Affiliation(s)
- Francesco Pini
- Department of Evolutionary Biology, University of Florence, via Romana 17, I-50125, Florence, Italy
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Luo SL, Chen L, Chen JL, Xiao X, Xu TY, Wan Y, Rao C, Liu CB, Liu YT, Lai C, Zeng GM. Analysis and characterization of cultivable heavy metal-resistant bacterial endophytes isolated from Cd-hyperaccumulator Solanum nigrum L. and their potential use for phytoremediation. CHEMOSPHERE 2011; 85:1130-1138. [PMID: 21868057 DOI: 10.1016/j.chemosphere.2011.07.053] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 07/24/2011] [Accepted: 07/25/2011] [Indexed: 05/28/2023]
Abstract
This study investigates the heavy metal-resistant bacterial endophytes of Cd-hyperaccumulator Solanum nigrum L. grown on a mine tailing by using cultivation-dependent technique. Thirty Cd-tolerant bacterial endophytes were isolated from roots, stems, and leaves of S. nigrum L. and classified by amplified ribosomal DNA-restriction analysis into 18 different types. Phylogenetic analysis based on 16S rDNA sequences showed that these isolates belonged to four groups: Actinobacteria (43%), Proteobacteria (23%), Bacteroidetes (27%) and Firmicutes (7%). All the isolates were then characterized for their plant growth promoting traits as well as their resistances to different heavy metals; and the actual plant growth promotion and colonization ability were also assessed. Four isolates were re-introduced into S. nigrum L. under Cd stress and resulted in Cd phytotoxicity decrease, as dry weights of roots increased from 55% to 143% and dry weights of above-ground from 64% to 100% compared to the uninoculated ones. The total Cd accumulation of inoculated plants increased from 66% to 135% (roots) and from 22% to 64% (above-ground) compared to the uninoculated ones. Our research suggests that bacterial endophytes are a most promising resource and may be the excellent candidates of bio-inoculants for enhancing the phytoremediation efficiency.
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Affiliation(s)
- Sheng-lian Luo
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, People's Republic of China.
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Trabelsi D, Mengoni A, Ben Ammar H, Mhamdi R. Effect of on-field inoculation of Phaseolus vulgaris with rhizobia on soil bacterial communities. FEMS Microbiol Ecol 2011; 77:211-22. [PMID: 21453320 DOI: 10.1111/j.1574-6941.2011.01102.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The aim of this study was to assess the impact of inoculation of Phaseolus vulgaris with two indigenous rhizobia strains on plant growth promotion, nitrogen turnover processes, richness and structure of the Rhizobiaceae and total bacterial communities in the bulk soil. Both strains used induced a significant increase in nodulation and grain yield. Analysis of bulk soil fertility showed positive, negative and strain-dependent effects of inoculation on nitrate, phosphorus and ammonium, respectively. Terminal-restriction fragment length polymorphism profiling demonstrated that inoculation significantly increased the phylotype richness of the bacterial communities. No significant difference in richness between the strains used and no additive effect of co-inoculation were observed. However, differences between both inoculants and a clear additive effect of co-inoculation on heterogeneity were found. This work gives original insights into the effect of rhizobial inoculation outside the restricted rhizospheric area. Effects on bacterial structure and diversity are clearly sensed in the neighbourhood of 25 cm and in a limited time course. Both Alpha- and Gammaproteobacteria, together with Firmicutes and Actinobacteria, were enhanced by inoculation, No evidence of terminal-restriction fragment inhibition was found. However, it remains to be answered how the impact on taxonomic groups can be related to effects on functional capabilities of soil microbial communities.
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Affiliation(s)
- Darine Trabelsi
- Laboratory of Legumes, Centre of Biotechnology of Borj-Cedria, Hammam-Lif, Tunisia
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