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Krishnappa C, Balamurugan A, Velmurugan S, Kumar S, Sampathrajan V, Kundu A, Javed M, Chouhan V, Ganesan P, Kumar A. Rice foliar-adapted Pantoea species: Promising microbial biostimulants enhancing rice resilience against foliar pathogens, Magnaporthe oryzae and Xanthomonas oryzae pv. oryzae. Microb Pathog 2024; 186:106445. [PMID: 37956936 DOI: 10.1016/j.micpath.2023.106445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/04/2023] [Accepted: 11/06/2023] [Indexed: 11/21/2023]
Abstract
Foliar fungal blast and bacterial leaf blight have significant impacts on rice production, and their management through host resistance and agrochemicals has proven inadequate. To achieve their sustainable management, innovative approaches like leveraging the foliar microbiome, which collaborates with plants and competes against pathogens, are essential. In our study, we isolated three Pantoea strains (P. agglomerans Os-Ep-PPA-1b, P. vagans Os-Ep-PPA-3b, and P. deleyi Os-Ep-VPA-9a) from the rice phylloplane. These isolates exhibited antimicrobial action through their metabolome and volatilome, while also promoting rice growth. Our analysis, using Gas Chromatography-Mass Spectrometry (GC-MS), revealed the presence of various antimicrobial compounds such as esters and fatty acids produced by these Pantoea isolates. Inoculating rice seedlings with P. agglomerans and P. vagans led to increased root and shoot growth. Additionally, bacterized seedlings displayed enhanced immunocompetence, as evidenced by upregulated expressions of defense genes (OsEDS1, OsFLS2, OsPDF2.2, OsACO4, OsICS OsPR1a, OsNPR1.3, OsPAD4, OsCERK1.1), along with heightened activities of defense enzymes like Polyphenol Oxidase and Peroxidase. These plants also exhibited elevated levels of total phenols. In field trials, the Pantoea isolates contributed to improved plant growth, exemplified by increased flag-leaf length, panicle number, and grains per panicle, while simultaneously reducing the incidence of chaffy grains. Hypersensitivity assays performed on a model plant, tobacco, confirmed the non-pathogenic nature of these Pantoea isolates. In summary, our study underscores the potential of Pantoea bacteria in combatting rice foliar diseases. Coupled with their remarkable growth-promoting and biostimulant capabilities, these findings position Pantoea as promising agents for enhancing rice cultivation.
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Affiliation(s)
- Charishma Krishnappa
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Alexander Balamurugan
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Shanmugam Velmurugan
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Shanu Kumar
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Vellaikumar Sampathrajan
- Agricultural College & Research Institute, Tamil Nadu Agricultural University, Madurai, 625104, India
| | - Aditi Kundu
- Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Mohammed Javed
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Vinod Chouhan
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Prakash Ganesan
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India
| | - Aundy Kumar
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110012, India.
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Tlais AZA, Rantsiou K, Filannino P, Cocolin LS, Cavoski I, Gobbetti M, Di Cagno R. Ecological linkages between biotechnologically relevant autochthonous microorganisms and phenolic compounds in sugar apple fruit (Annona squamosa L.). Int J Food Microbiol 2023; 387:110057. [PMID: 36563533 DOI: 10.1016/j.ijfoodmicro.2022.110057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 11/18/2022] [Accepted: 12/07/2022] [Indexed: 12/15/2022]
Abstract
Our study investigated the potential of Annona squamosa (L.) fruit as a reservoir of yeasts and lactic acid bacteria having biotechnological implications, and phenolics capable of modifying the ecology of microbial consortia. Only a single species of lactic acid bacteria (Enterococcus faecalis) was identified, while Annona fruit seemed to be a preferred niche for yeasts (Saccharomyces cerevisiae, Hanseniaspora uvarum), which were differentially distributed in the fruit. In order to identify ecological implications for inherent phenolics, the antimicrobial potential of water- and methanol/water-soluble extracts from peel and pulp was studied. Pulp extracts did not show any antimicrobial activity against the microbial indicators, while some Gram-positive bacteria (Staphylococcus aureus, Staphylococcus saprophyticus, Listeria monocytogenes, Bacillus megaterium) were susceptible to peel extracts. Among lactic acid bacteria used as indicators, only Lactococcus lactis and Weissella cibaria were inhibited. The chemical profiling of methanol/water-soluble phenolics from Annona peel reported a full panel of 41 phenolics, mainly procyanidins and catechin derivatives. The antimicrobial activity was associated to specific compounds (procyanidin dimer type B [isomer 1], rutin [isomer 2], catechin diglucopyranoside), in addition to unidentified catechin derivatives. E. faecalis, which was detected in the epiphytic microbiota, was well adapted to the phenolics from the peel. Peel phenolics had a growth-promoting effect toward the autochthonous yeasts S. cerevisiae and H. uvarum.
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Affiliation(s)
| | - Kalliopi Rantsiou
- Department of Agricultural, Forest, and Food Science, University of Turin, Grugliasco, Torino, Italy
| | - Pasquale Filannino
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, 70126 Bari, Italy.
| | - Luca Simone Cocolin
- Department of Agricultural, Forest, and Food Science, University of Turin, Grugliasco, Torino, Italy
| | - Ivana Cavoski
- CIHEAM-MAIB, Mediterranean Agronomic Institute of Bari, 70010 Valenzano, Bari, Italy
| | - Marco Gobbetti
- Faculty of Sciences and Technology, Libera Università di Bolzano, 39100 Bolzano, Italy
| | - Raffaella Di Cagno
- Faculty of Sciences and Technology, Libera Università di Bolzano, 39100 Bolzano, Italy
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Patel A, Sahu KP, Mehta S, Javed M, Balamurugan A, Ashajyothi M, Sheoran N, Ganesan P, Kundu A, Gopalakrishnan S, Gogoi R, Kumar A. New Insights on Endophytic Microbacterium-Assisted Blast Disease Suppression and Growth Promotion in Rice: Revelation by Polyphasic Functional Characterization and Transcriptomics. Microorganisms 2023; 11:microorganisms11020362. [PMID: 36838327 PMCID: PMC9963279 DOI: 10.3390/microorganisms11020362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/24/2022] [Accepted: 01/01/2023] [Indexed: 02/05/2023] Open
Abstract
Plant growth-promoting endophytic microbes have drawn the attention of researchers owing to their ability to confer fitness benefits in many plant species. Here, we report agriculturally beneficial traits of rice-leaf-adapted endophytic Microbacterium testaceum. Our polyphasic taxonomic investigations revealed its identity as M. testaceum. The bacterium displayed typical endophytism in rice leaves, indicated by the green fluorescence of GFP-tagged M. testaceum in confocal laser scanning microscopy. Furthermore, the bacterium showed mineral solubilization and production of IAA, ammonia, and hydrolytic enzymes. Tobacco leaf infiltration assay confirmed its non-pathogenic nature on plants. The bacterium showed antifungal activity on Magnaporthe oryzae, as exemplified by secreted and volatile organic metabolome-mediated mycelial growth inhibition. GC-MS analysis of the volatilome of M. testaceum indicated the abundance of antimicrobial compounds. Bacterization of rice seedlings showed phenotypic traits of MAMP-triggered immunity (MTI), over-expression of OsNPR1 and OsCERK, and the consequent blast suppressive activity. Strikingly, M. testaceum induced the transcriptional tradeoff between physiological growth and host defense pathways as indicated by up- and downregulated DEGs. Coupled with its plant probiotic features and the defense elicitation activity, the present study paves the way for developing Microbacterium testaceum-mediated bioformulation for sustainably managing rice blast disease.
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Verma S, Azevedo LCB, Pandey J, Khusharia S, Kumari M, Kumar D, Kaushalendra, Bhardwaj N, Teotia P, Kumar A. Microbial Intervention: An Approach to Combat the Postharvest Pathogens of Fruits. PLANTS (BASEL, SWITZERLAND) 2022; 11:3452. [PMID: 36559563 PMCID: PMC9787458 DOI: 10.3390/plants11243452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 09/29/2023]
Abstract
Plants host diverse microbial communities, which undergo a complex interaction with each other. Plant-associated microbial communities provide various benefits to the host directly or indirectly, viz. nutrient acquisition, protection from pathogen invaders, mitigation from different biotic and abiotic stress. Presently, plant-associated microbial strains are frequently utilized as biofertilizers, biostimulants and biocontrol agents in greenhouse and field conditions and have shown satisfactory results. Nowadays, the plant/fruit microbiome has been employed to control postharvest pathogens and postharvest decay, and to maintain the quality or shelf life of fruits. In this context, the intervention of the natural fruit microbiome or the creation of synthetic microbial communities to modulate the functional attributes of the natural microbiome is an emerging aspect. In this regard, we discuss the community behavior of microbes in natural conditions and how the microbiome intervention plays a crucial role in the postharvest management of fruits.
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Affiliation(s)
- Sargam Verma
- Department of Biotechnology, Noida International University, Noida 203201, India
| | - Lucas Carvalho Basilio Azevedo
- Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Campus Glória—Bloco CCG, Santa Mônica 38408-100, Brazil
| | - Jyoti Pandey
- Department of Biochemistry, Singhania University, Jhunjhunu 333515, India
| | - Saksham Khusharia
- Kuwar SatyaVira College of Engineering and Management, Bijnor 246701, India
| | | | - Dharmendra Kumar
- Department of Zoology, C.M.B.College, Deorh, Ghoghardiha 847402, India
| | - Kaushalendra
- Department of Zoology, Pachhunga University College Campus, Mizoram University (A Central University), Aizawl 796001, India
| | - Nikunj Bhardwaj
- Department of Zoology, Maharaj Singh College, Maa Shakumbhari University, Saharanpur 247001, India
| | - Pratibha Teotia
- Department of Biotechnology, Noida International University, Noida 203201, India
| | - Ajay Kumar
- Department of Postharvest Science, Agricultural Research Organization (ARO)—Volcani Center, Rishon Lezion 7505101, Israel
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5
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Debaryomyces nepalensis reduces fungal decay by affecting the postharvest microbiome during jujube storage. Int J Food Microbiol 2022; 379:109866. [PMID: 35944358 DOI: 10.1016/j.ijfoodmicro.2022.109866] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 07/18/2022] [Accepted: 07/28/2022] [Indexed: 11/22/2022]
Abstract
Microbial antagonists are effective and environmentally friendly in controlling postharvest diseases of fruit. The present study investigated the influence of D. nepalensis on epiphytic microbiome and postharvest decay of jujube. Results showed that D. nepalensis notably reduced fungal decay, maintained the fruit firmness and delayed discoloration. The epiphytic microbiome revealed that D. nepalensis changed the fungal communities, but few influence on bacterial communities were observed. D. nepalensis, as the dominant population in the treatment group, decreased the abundance of pathogenic fungi of Alternaria, Penicillium, Fusarium and Botrytis, while increased the beneficial bacteria of Pantoea. The canonical correspondence analysis revealed that Debaryomyces was negatively correlated with the decay rate, whereas Penicillium, Acremonium, Rhodosporidiobolus and Hansfordia were positively correlated. In conclusion, D. nepalensis altered the successional process of fungal and bacterial communities to reduce the decay rate of jujube during storage.
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Vermote L, Verce M, Mozzi F, De Vuyst L, Weckx S. Microbiomes Associated With the Surfaces of Northern Argentinian Fruits Show a Wide Species Diversity. Front Microbiol 2022; 13:872281. [PMID: 35898900 PMCID: PMC9309516 DOI: 10.3389/fmicb.2022.872281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 06/23/2022] [Indexed: 11/13/2022] Open
Abstract
The fiber, vitamin, and antioxidant contents of fruits contribute to a balanced human diet. In countries such as Argentina, several tropical fruits are witnessing a high yield in the harvest season, with a resulting surplus. Fruit fermentation using autochthonous starter cultures can provide a solution for food waste. However, limited knowledge exists about the microbiota present on the surfaces of fruits and the preceding flowers. In the present exploratory study, the microbiomes associated with the surfaces of tropical fruits from Northern Argentina, such as white guava, passion fruit and papaya were investigated using a shotgun metagenomic sequencing approach. Hereto, one sample composed of 14 white guava fruits, two samples of passion fruits with each two to three fruits representing the almost ripe and ripe stage of maturity, four samples of papaya with each two to three fruits representing the unripe, almost ripe, and ripe stage of maturity were processed, as well as a sample of closed and a sample of open Japanese medlar flowers. A considerable heterogeneity was found in the composition of the fruits’ surface microbiota at the genus and species level. While bacteria dominated the microbiota of the fruits and flowers, a small number of the metagenomic sequence reads corresponded with yeasts and filamentous fungi. A minimal abundance of bacterial species critical in lactic acid and acetic acid fermentations was found. A considerable fraction of the metagenomic sequence reads from the fruits’ surface microbiomes remained unidentified, which suggested that intrinsic species are to be sequenced or discovered.
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Affiliation(s)
- Louise Vermote
- Faculty of Sciences and Bioengineering Sciences, Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Vrije Universiteit Brussel, Brussels, Belgium
| | - Marko Verce
- Faculty of Sciences and Bioengineering Sciences, Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Vrije Universiteit Brussel, Brussels, Belgium
| | - Fernanda Mozzi
- Technology and Development Laboratory, Centro de Referencia para Lactobacilos (CERELA)-CONICET, San Miguel de Tucumán, Argentina
| | - Luc De Vuyst
- Faculty of Sciences and Bioengineering Sciences, Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Vrije Universiteit Brussel, Brussels, Belgium
| | - Stefan Weckx
- Faculty of Sciences and Bioengineering Sciences, Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Vrije Universiteit Brussel, Brussels, Belgium
- *Correspondence: Stefan Weckx,
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7
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Production and Functionalities of Specialized Metabolites from Different Organic Sources. Metabolites 2022; 12:metabo12060534. [PMID: 35736468 PMCID: PMC9228302 DOI: 10.3390/metabo12060534] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/02/2022] [Accepted: 06/08/2022] [Indexed: 02/05/2023] Open
Abstract
Medicinal plants are rich sources of specialized metabolites that are of great importance to plants, animals, and humans. The usefulness of active biological compounds cuts across different fields, such as agriculture, forestry, food processing and packaging, biofuels, biocatalysts, and environmental remediation. In recent years, research has shifted toward the use of microbes, especially endophytes (bacteria, fungi, and viruses), and the combination of these organisms with other alternatives to optimize the production and regulation of these compounds. This review reinforces the production of specialized metabolites, especially by plants and microorganisms, and the effectiveness of microorganisms in increasing the production/concentration of these compounds in plants. The study also highlights the functions of these compounds in plants and their applications in various fields. New research areas that should be explored to produce and regulate these compounds, especially in plants and microbes, have been identified. Methods involving molecular studies are yet to be fully explored, and next-generation sequencing possesses an interesting and reliable approach.
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8
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Nguyen MP, Lehosmaa K, Martz F, Koskimäki JJ, Pirttilä AM, Häggman H. Host species shape the community structure of culturable endophytes in fruits of wild berry species (Vaccinium myrtillus L., Empetrum nigrum L. and Vaccinium vitis-idaea L.). FEMS Microbiol Ecol 2021; 97:6319499. [PMID: 34251452 PMCID: PMC8292141 DOI: 10.1093/femsec/fiab097] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 07/08/2021] [Indexed: 11/12/2022] Open
Abstract
Wild berries are interesting research subjects due to their rich sources of health-beneficial phenolic compounds. However, the internal microbial communities, endophytes, associated with the wild berry fruits are currently unknown. Endophytes are bacteria or fungi inhabiting inside plant tissues, and their functions vary depending on the host species and environmental parameters. The present study aimed to examine community composition of fungal and bacterial endophytes in fruits of three wild berry species (bilberry Vaccinium myrtillus L., lingonberry Vaccinium vitis-idaea L. and crowberry Empetrum nigrum L.) and the effects of host plant species and their growth sites on shaping the endophytic communities. We found that the endophytic community structures differed between the berry species, and fungi were predominant over bacteria in the total endophytic taxa. We identified previously unknown endophytic fungal taxa including Angustimassarina, Dothidea, Fellozyma, Pseudohyphozyma, Hannaella coprosmae and Oberwinklerozyma straminea. A role of soluble phenolic compounds, the intracellular components in wild berry fruits, in shaping the endophytic communities is proposed. Overall, our study demonstrates that each berry species harbors a unique endophytic community of microbes.
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Affiliation(s)
- Minh-Phuong Nguyen
- Ecology and Genetics Research Unit, University of Oulu, FI-90014, P.O. Box 3000, Oulu, Finland
| | - Kaisa Lehosmaa
- Ecology and Genetics Research Unit, University of Oulu, FI-90014, P.O. Box 3000, Oulu, Finland
| | - Françoise Martz
- Natural Resources Institute Finland, Production Systems, Ounasjoentie 6, FI-96200, Rovaniemi, Finland
| | - Janne J Koskimäki
- Ecology and Genetics Research Unit, University of Oulu, FI-90014, P.O. Box 3000, Oulu, Finland
| | - Anna Maria Pirttilä
- Ecology and Genetics Research Unit, University of Oulu, FI-90014, P.O. Box 3000, Oulu, Finland
| | - Hely Häggman
- Ecology and Genetics Research Unit, University of Oulu, FI-90014, P.O. Box 3000, Oulu, Finland
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Zhang H, Serwah Boateng NA, Ngolong Ngea GL, Shi Y, Lin H, Yang Q, Wang K, Zhang X, Zhao L, Droby S. Unravelling the fruit microbiome: The key for developing effective biological control strategies for postharvest diseases. Compr Rev Food Sci Food Saf 2021; 20:4906-4930. [PMID: 34190408 DOI: 10.1111/1541-4337.12783] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 12/15/2022]
Abstract
Fruit-based diets are recognized for their benefits to human health. The safety of fruit is a global concern for scientists. Fruit microbiome represents the whole microorganisms that are associated with a fruit. These microbes are either found on the surfaces (epiphytes) or in the tissues of the fruit (endophytes). The recent knowledge gained from these microbial communities is considered relevant to the field of biological control in prevention of postharvest fruit pathology. In this study, the importance of the microbiome of certain fruits and how it holds promise for solving the problems inherent in biocontrol and postharvest crop protection are summarized. Research needs on the fruit microbiome are highlighted. Data from DNA sequencing and "meta-omics" technologies very recently applied to the study of microbial communities of fruits in the postharvest context are also discussed. Various fruit parameters, management practices, and environmental conditions are the main determinants of the microbiome. Microbial communities can be classified according to their structure and function in fruit tissues. A critical mechanism of microbial biological control agents is to reshape and interact with the microbiome of the fruit. The ability to control the microbiome of any fruit is a great potential in postharvest management of fruits. Research on the fruit microbiome offers important opportunities to develop postharvest biocontrol strategies and products, as well as the health profile of the fruit.
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Affiliation(s)
- Hongyin Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | | | - Guillaume Legrand Ngolong Ngea
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China.,Institute of Fisheries Sciences, University of Douala, Douala, Cameroon
| | - Yu Shi
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Hetong Lin
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Qiya Yang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Kaili Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Xiaoyun Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Lina Zhao
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Samir Droby
- Department of Postharvest Science, ARO, the Volcani Center, Rishon LeZion, Israel
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Wang F, Zhang R, Yuan Z, Chen P. Biological prevention and control of pitaya fruit canker disease using endophytic fungi isolated from papaya. Arch Microbiol 2021; 203:4033-4040. [PMID: 34041559 DOI: 10.1007/s00203-021-02378-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 05/10/2021] [Accepted: 05/11/2021] [Indexed: 11/28/2022]
Abstract
Pitaya fruit canker is an important disease in pitaya production. Facilitating resistance through the application of biological control principles is a promising alternative to traditional control strategies. This study evaluated the induced resistance of Penicillium rolfsii, numbered Y17 isolated from papaya leaves in pitaya fruit, and evaluated the activity of the defense enzymes, total antioxidant capacity (T-AOC), and malondialdehyde (MDA) content of the treated fruit. The results demonstrate that treatment with Y17 effectively induced resistance of pitaya fruit to canker disease caused by Neoscytalidium dimidiatum, with an inhibition rate of 70.87%. In addition, Y17 notably improved the activities of peroxidase, catalase, and polyphenol oxidase as well as the T-AOC of the treated samples. Y17 treatment reduced the MDA content in these fruits. Taken together, our results suggest that Y17 treatment could trigger pitaya fruit defense responses and effectively induce resistance to fruit canker disease.
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Affiliation(s)
- Furun Wang
- College of Horticulture, Hainan University, Haikou, 570228, People's Republic of China
| | - Ruining Zhang
- College of Horticulture, Hainan University, Haikou, 570228, People's Republic of China
| | - Zhouyu Yuan
- College of Horticulture, Hainan University, Haikou, 570228, People's Republic of China
| | - Ping Chen
- College of Horticulture, Hainan University, Haikou, 570228, People's Republic of China.
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11
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Fresno DH, Munné-Bosch S. Differential Tissue-Specific Jasmonic Acid, Salicylic Acid, and Abscisic Acid Dynamics in Sweet Cherry Development and Their Implications in Fruit-Microbe Interactions. FRONTIERS IN PLANT SCIENCE 2021; 12:640601. [PMID: 33603766 PMCID: PMC7884454 DOI: 10.3389/fpls.2021.640601] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 01/12/2021] [Indexed: 05/31/2023]
Abstract
Sweet cherry is an important non-climacteric fruit with a high commercial interest, but exploitation of sweet cherry trees (Prunus avium L.) in orchards is usually subject to important economic losses due to fruit decay by pathogenic fungi and other microorganisms. Sweet cherries development and ripening are characterized by profound physiological changes in the fruit, among which the phytohormone abscisic acid (ABA) plays a pivotal role. In addition, sweet cherries are usually affected by fruit decay pathogens, and the role of other stress-related hormones such as jasmonic acid (JA) and salicylic acid (SA) may also be of paramount importance, not only from a developmental point of view, but also from a fruit-microbe interaction perspective. Here, a tissue-specific hormone quantification by LC-MS/MS, including the contents of JA, SA, and ABA, in the fruit exocarp and mesocarp of sweet cherries during fruit development from trees growing in a commercial orchard was carried out. Additionally, this study was complemented with the characterization of the culturable epiphytic and endophytic microbial communities of sweet cherries at various stages of fruit development and during cracking lesion formation. Our results revealed a completely differential behavior of phytohormones between both tissues (the exocarp and mesocarp), with a more dynamic exocarp in front of a more stable mesocarp, and with marked variations during fruit development. Microbial epiphytic community was mainly composed by yeasts, although rot-causing fungi like Alternaria spp. were always also present throughout fruit development. Endophytic colonization was poor, but it increased throughout fruit development. Furthermore, when the exocarp was naturally disrupted in sweet cherries suffering from cracking, the colonization by Alternaria spp. markedly increased. Altogether, results suggest that the fruit exocarp and mesocarp are very dynamic tissues in which endogenous phytohormones not only modulate fruit development and ripening but also fruit-microbe interactions.
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Affiliation(s)
- David H. Fresno
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
- Institute of Nutrition and Food Safety (INSA), University of Barcelona, Barcelona, Spain
| | - Sergi Munné-Bosch
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
- Institute of Nutrition and Food Safety (INSA), University of Barcelona, Barcelona, Spain
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12
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Kumar A, Zhimo Y, Biasi A, Salim S, Feygenberg O, Wisniewski M, Droby S. Endophytic Microbiome in the Carposphere and Its Importance in Fruit Physiology and Pathology. POSTHARVEST PATHOLOGY 2021. [DOI: 10.1007/978-3-030-56530-5_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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13
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Carvalheira A, Silva J, Teixeira P. Acinetobacter spp. in food and drinking water - A review. Food Microbiol 2020; 95:103675. [PMID: 33397609 DOI: 10.1016/j.fm.2020.103675] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 11/02/2020] [Accepted: 11/03/2020] [Indexed: 01/01/2023]
Abstract
Acinetobacter spp. has emerged as a pathogen of major public health concern due to their increased resistance to antibiotics and their association with a wide range of nosocomial infections, community-acquired infections and war and natural disaster-related infections. It is recognized as a ubiquitous organism however, information about the prevalence of different pathogenic species of this genus in food sources and drinking water is scarce. Since the implementation of molecular techniques, the role of foods as a source of several species, including the Acinetobacter baumannii group, has been elucidated. Multidrug resistance was also detected among Acinetobacter spp. isolated from food products. This highlights the importance of foods as potential sources of dissemination of Acinetobacter spp. between the community and clinical environments and reinforces the need for further investigations on the potential health risks of Acinetobacter spp. as foodborne pathogens. The aim of this review was to summarize the published data on the occurrence of Acinetobacter spp. in different food sources and drinking water. This information should be taken into consideration by those responsible for infection control in hospitals and other healthcare facilities.
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Affiliation(s)
- Ana Carvalheira
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005, Porto, Portugal
| | - Joana Silva
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005, Porto, Portugal
| | - Paula Teixeira
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005, Porto, Portugal.
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Diversity and characterization of culturable haloalkaliphilic bacteria from two distinct hypersaline lakes in northern Egypt. Biologia (Bratisl) 2020. [DOI: 10.2478/s11756-020-00609-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Sriram KP, Mangrolia U, Osborne WJ. Isolation and characterization of culturable indigenous endophytic bacteria in the tender coconut. FOOD BIOTECHNOL 2020. [DOI: 10.1080/08905436.2020.1789872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Karthik P. Sriram
- Department of Bio Sciences, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Upasana Mangrolia
- Department of Bio Sciences, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - W. Jabez Osborne
- Department of Bio Sciences, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
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Salo EN, Novero A. Identification and Characterisation of Endophytic Bacteria from Coconut ( Cocos nucifera) Tissue Culture. Trop Life Sci Res 2020; 31:57-68. [PMID: 32963711 PMCID: PMC7485530 DOI: 10.21315/tlsr2020.31.1.4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The coconut is an important economic crop in the Philippines which currently ranks as the world's second largest producer. This study characterised and identified endophytes from coconut tissue culture in order to gain an initial understanding of their potential uses as sources of bioproducts. The isolates were evaluated using morphological, biochemical and molecular methods. Gram staining results revealed that four out of five bacteria isolated were Gram positive. Isolate CEB 1 fermented all three sugars in the Triple Sugar Iron Test while the other four did not. 16S rDNA gene fragments were amplified from genomic DNA using the universal primers 16F27 and 16R1542. The 16S rDNA sequence were found to be homologous to Bacillus subtilis and Pantoea dispersa. Phylogenetic analyses showed significant clustering of bacterial isolates together with archived DNA of B. subtilis and P. dispersa. All isolated bacteria matched the characteristics of their molecular homologies. Isolate CEB 5, identified as B. subtilis, produced red pigments which are possibly pulcherrimin. Literature reports that pulcherrimin possesses antimicrobial activity against yeast species, microscopic fungi, and postharvest pathogens. P. dispera, on the other hand, has been reported to convert insoluble phosphorus into soluble form to enable plants to take up more phosphorus. Determination of the bioactivities of endophytes reported in this study may enable the discovery of novel bioproducts.
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Affiliation(s)
- Elv Nhiel Salo
- Department of Biological Sciences and Environmental Studies, College of Science and Mathematics, University of the Philippines Mindanao, Tugbok District, Davao City 8022, Philippines
| | - Annabelle Novero
- Department of Biological Sciences and Environmental Studies, College of Science and Mathematics, University of the Philippines Mindanao, Tugbok District, Davao City 8022, Philippines
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Qiu Z, Zheng Z, Zhang B, Sun-Waterhouse D, Qiao X. Formation, nutritional value, and enhancement of characteristic components in black garlic: A review for maximizing the goodness to humans. Compr Rev Food Sci Food Saf 2020; 19:801-834. [PMID: 33325167 DOI: 10.1111/1541-4337.12529] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/28/2019] [Accepted: 12/11/2019] [Indexed: 12/30/2022]
Abstract
Black garlic (BG) is essentially a processed food and obtained through the transformation of fresh garlic (FG) (Allium sativum L.) via a range of chemical reactions (including the Maillard reaction) and microbial fermentation. This review provides the up-to-date knowledge of the dynamic and complicated changes in major components during the conversion of FG to BG, including moisture, lipids, carbohydrates (such as sugars), proteins, organic acids, organic sulfur compounds, alkaloids, polyphenols, melanoidins, 5-hydroxymethylfurfural, vitamins, minerals, enzymes, and garlic endophytes. The obtained evidence confirms that BG has several advantages over FG in certain product attributes and biological properties (especially antioxidant activity), and the factors affecting the quality of BG include the type and characteristics of FG and processing technologies and methods (especially pretreatments, and processing temperature and humidity). The interactions among garlic components, and between garlic nutrients and microbes, as well as the interplay between pretreatment and main manufacturing process, all determine the sensory and nutritional qualities of BG. Before BG is marketed as a novel snack or functional food, more research is required to fill the knowledge gaps related to quantitative monitoring of the changes in metabolites (especially those taste-active and/or biological-active substances) during BG manufacturing to maximize BG's antioxidant, anticancer, antiobesity, anti-inflammatory, immunostimulatory, anti-allergic, hepatoprotective, cardioprotective and oxidative stress-/hangover syndrome-reducing functions, and beneficial effects on memory/nervous systems. Assessments of the quality, efficacy, and safety of BG should be performed considering the impacts of BG production conditions, postproduction handling, and intake methods.
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Affiliation(s)
- Zhichang Qiu
- Key Laboratory of Food Processing Technology and Quality Control of Shandong Higher Education Institutes, The College of Food Science and Engineering, Shandong Agricultural University, Shandong, P. R. China
| | - Zhenjia Zheng
- Key Laboratory of Food Processing Technology and Quality Control of Shandong Higher Education Institutes, The College of Food Science and Engineering, Shandong Agricultural University, Shandong, P. R. China
| | - Bin Zhang
- Key Laboratory of Food Processing Technology and Quality Control of Shandong Higher Education Institutes, The College of Food Science and Engineering, Shandong Agricultural University, Shandong, P. R. China
| | - Dongxiao Sun-Waterhouse
- Key Laboratory of Food Processing Technology and Quality Control of Shandong Higher Education Institutes, The College of Food Science and Engineering, Shandong Agricultural University, Shandong, P. R. China.,The School of Chemical Sciences, The University of Auckland, Auckland, New Zealand
| | - Xuguang Qiao
- Key Laboratory of Food Processing Technology and Quality Control of Shandong Higher Education Institutes, The College of Food Science and Engineering, Shandong Agricultural University, Shandong, P. R. China
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Mohd Taha MD, Mohd Jaini MF, Saidi NB, Abdul Rahim R, Md Shah UK, Mohd Hashim A. Biological control of Erwinia mallotivora, the causal agent of papaya dieback disease by indigenous seed-borne endophytic lactic acid bacteria consortium. PLoS One 2019; 14:e0224431. [PMID: 31841519 PMCID: PMC6913974 DOI: 10.1371/journal.pone.0224431] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 10/15/2019] [Indexed: 11/18/2022] Open
Abstract
Dieback disease caused by Erwinia mallotivora is a major threat to papaya plantation in Malaysia. The current study was conducted to evaluate the potential of endophytic lactic acid bacteria (LAB) isolated from papaya seeds for disease suppression of papaya dieback. Two hundred and thirty isolates were screened against E. mallotivora BT-MARDI, and the inhibitory activity of the isolates against the pathogen was ranging from 11.7–23.7 mm inhibition zones. The synergistic experiments revealed that combination of W. cibaria PPKSD19 and Lactococcus lactis subsp. lactis PPSSD39 increased antibacterial activity against the pathogen. The antibacterial activity was partially due to the production of bacteriocin-like inhibitory substances (BLIS). The nursery experiment confirmed that the application of bacterial consortium W. cibaria PPKSD19 and L. lactis subsp. lactis PPSSD39 significantly reduced disease severity to 19% and increased biocontrol efficacy to 69% of infected papaya plants after 18 days of treatment. This study showed that W. cibaria PPKSD19 and L. lactis subsp. lactis PPSSD39 are potential candidate as biocontrol agents against papaya dieback disease.
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Affiliation(s)
- Mariam Dayana Mohd Taha
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Mohammad Fahrulazri Mohd Jaini
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Noor Baity Saidi
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Raha Abdul Rahim
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Umi Kalsom Md Shah
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Amalia Mohd Hashim
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
- * E-mail:
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Kouipou Toghueo RM, Boyom FF. Endophytes from ethno-pharmacological plants: Sources of novel antioxidants- A systematic review. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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20
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Saleh D, Jarry J, Rani M, Aliferis K, Seguin P, Jabaji S. Diversity, distribution and multi‐functional attributes of bacterial communities associated with the rhizosphere and endosphere of timothy (Phleum pratenseL.). J Appl Microbiol 2019; 127:794-811. [DOI: 10.1111/jam.14334] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 05/09/2019] [Accepted: 05/15/2019] [Indexed: 11/29/2022]
Affiliation(s)
- D. Saleh
- Department of Plant Science Department, Faculty of Agricultural and Environmental Sciences Macdonald Campus of McGill University Ste‐Anne‐De Bellevue QC Canada
| | - J. Jarry
- Department of Plant Science Department, Faculty of Agricultural and Environmental Sciences Macdonald Campus of McGill University Ste‐Anne‐De Bellevue QC Canada
| | - M. Rani
- Department of Plant Science Department, Faculty of Agricultural and Environmental Sciences Macdonald Campus of McGill University Ste‐Anne‐De Bellevue QC Canada
| | - K.A. Aliferis
- Laboratory of Pesticide Science Agricultural University of Athens Athens Greece
| | - P. Seguin
- Department of Plant Science Department, Faculty of Agricultural and Environmental Sciences Macdonald Campus of McGill University Ste‐Anne‐De Bellevue QC Canada
| | - S.H. Jabaji
- Department of Plant Science Department, Faculty of Agricultural and Environmental Sciences Macdonald Campus of McGill University Ste‐Anne‐De Bellevue QC Canada
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Abstract
Abstract
Fungi remain a promising source of novel biologically active compounds with potentials in drug discovery and development. This study was aimed at investigating the secondary metabolites from endophytic Fusarium equiseti and Epicoccum sorghinum associated with leaves of Carica papaya collected from Agulu, Anambra State, Nigeria. Isolation of the endophytic fungi, taxonomic identification, fermentation, extraction and isolation of fungal secondary metabolites were carried out using standard procedures. Chromatographic separation and spectroscopic analyses of the fungal secondary metabolites yielded three toxigenic compounds - equisetin and its epimer 5’- epiequisetin from F. equiseti and tenuazonic acid from E. sorghinum These compounds are known to possess several beneficial biological properties that can be explored for pharmaceutical, agricultural or industrial purposes.
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Saminathan T, García M, Ghimire B, Lopez C, Bodunrin A, Nimmakayala P, Abburi VL, Levi A, Balagurusamy N, Reddy UK. Metagenomic and Metatranscriptomic Analyses of Diverse Watermelon Cultivars Reveal the Role of Fruit Associated Microbiome in Carbohydrate Metabolism and Ripening of Mature Fruits. FRONTIERS IN PLANT SCIENCE 2018; 9:4. [PMID: 29403516 PMCID: PMC5780703 DOI: 10.3389/fpls.2018.00004] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 01/03/2018] [Indexed: 05/06/2023]
Abstract
The plant microbiome is a key determinant of plant health and productivity, and changes in the plant microbiome can alter the tolerance to biotic and abiotic stresses and the quality of end produce. Little is known about the microbial diversity and its effect on carbohydrate metabolism in ripe fruits. In this study, we aimed to understand the diversity and function of microorganisms in relation to carbohydrate metabolism of ripe watermelon fruits. We used 16S metagenomics and RNAseq metatranscriptomics for analysis of red (PI459074, Congo, and SDRose) and yellow fruit-flesh cultivars (PI227202, PI435990, and JBush) of geographically and metabolically diverse watermelon cultivars. Metagenomics data showed that Proteobacteria were abundant in SDRose and PI227202, whereas Cyanobacteria were most abundant in Congo and PI4559074. In the case of metatranscriptome data, Proteobacteria was the most abundant in all cultivars. High expression of genes linked to infectious diseases and the expression of peptidoglycan hydrolases associated to pathogenicity of eukaryotic hosts was observed in SDRose, which could have resulted in low microbial diversity in this cultivar. The presence of GH28, associated with polygalacturonase activity in JBush and SDRose could be related to cell wall modifications including de-esterification and depolymerization, and consequent loss of galacturonic acid and neutral sugars. Moreover, based on the KEGG annotation of the expressed genes, nine α-galactosidase genes involved in key processes of galactosyl oligosaccharide metabolism, such as raffinose family were identified and galactose metabolism pathway was reconstructed. Results of this study underline the links between the host and fruit-associated microbiome in carbohydrate metabolism of the ripe fruits. The cultivar difference in watermelon reflects the quantum and diversity of the microbiome, which would benefit watermelon and other plant breeders aiming at the holobiont concept to incorporate associated microbiomes in breeding programs.
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Affiliation(s)
- Thangasamy Saminathan
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
| | - Marleny García
- Laboratorio de Biorremediación, Facultad de Ciencias Biológicas, Universidad Autónoma de Coahuila, Torreón, Mexico
| | - Bandana Ghimire
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
| | - Carlos Lopez
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
- Laboratorio de Biorremediación, Facultad de Ciencias Biológicas, Universidad Autónoma de Coahuila, Torreón, Mexico
| | - Abiodun Bodunrin
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
| | - Padma Nimmakayala
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
| | - Venkata L. Abburi
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
| | - Amnon Levi
- U.S. Vegetable Laboratory, Agricultural Research Service, United States Department of Agriculture, Charleston, SC, United States
| | - Nagamani Balagurusamy
- Laboratorio de Biorremediación, Facultad de Ciencias Biológicas, Universidad Autónoma de Coahuila, Torreón, Mexico
| | - Umesh K. Reddy
- Gus R. Douglass Institute and Department of Biology, West Virginia State University, Institute, WV, United States
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Lewin A, Zhou J, Pham VTT, Haugen T, Zeiny ME, Aarstad O, Liebl W, Wentzel A, Liles MR. Novel archaeal thermostable cellulases from an oil reservoir metagenome. AMB Express 2017; 7:183. [PMID: 28963711 PMCID: PMC5622026 DOI: 10.1186/s13568-017-0485-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 09/20/2017] [Indexed: 01/24/2023] Open
Abstract
Microbial assemblages were sampled from an offshore deep sub-surface petroleum reservoir 2.5 km below the ocean floor off the coast of Norway, providing conditions of high temperature and pressure, to identify new thermostable enzymes. In this study, we used DNA sequences obtained directly from the sample metagenome and from a derived fosmid library to survey the functional diversity of this extreme habitat. The metagenomic fosmid library containing 11,520 clones was screened using function- and sequence-based methods to identify recombinant clones expressing carbohydrate-degrading enzymes. Open reading frames (ORFs) encoding carbohydrate-degrading enzymes were predicted by BLAST against the CAZy database, and many fosmid clones expressing carbohydrate-degrading activities were discovered by functional screening using Escherichia coli as a heterologous host. Each complete ORF predicted to encode a cellulase identified from sequence- or function-based screening was subcloned in an expression vector. Five subclones was found to have significant activity using a fluorescent cellulose model substrate, and three of these were observed to be highly thermostable. Based on phylogenetic analyses, the thermostable cellulases were derived from thermophilic Archaea and are distinct from known cellulases. Cellulase F1, obtained from function-based screening, contains two distinct cellulase modules, perhaps resulting from fusion of two archaeal cellulases and with a novel protein structure that may result in enhanced activity and thermostability. This enzyme was found to exhibit exocellulase function and to have a remarkably high activity compared to commercially available enzymes. Results from this study highlight the complementarity of hybrid approaches for enzyme discovery, combining sequence- and function-based screening.
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Mukherjee A, Bhattacharjee P, Das R, Pal A, Paul AK, K. Paul A. Endophytic bacteria with plant growth promoting abilities from Ophioglossum reticulatum L. AIMS Microbiol 2017; 3:596-612. [PMID: 31294178 PMCID: PMC6604999 DOI: 10.3934/microbiol.2017.3.596] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/05/2017] [Indexed: 11/18/2022] Open
Abstract
Endophytic bacteria colonizing the internal tissues of plants are known to improve plant growth by a wide variety of mechanisms. This study envisages the isolation and evaluation of plant growth promoting attributes of bacterial endophytes in perennial fern Ophioglossum reticulatum L. A total of 20 phenotypically distinguishable bacterial endophytes were isolated from surface sterilized leaf lamina, petiole, rhizome and spike of O. reticulatum L. The Shannon-Weaver diversity index showed that the rhizome (1.54) harbor more diverse types of endophytic bacteria than in its petiole, leaf lamina and spike. The isolated endophytes were characterized on the basis of micromorphological and physio-biochemical characters and tentatively assigned to the genus Bacillus, Pseudomonas and Staphylococcus. The isolates showed distinct variations in their enzymatic activities, sugar fermentation and antibiotic sensitivity profile. A number of endophytic isolates showed plant growth promoting activities like production of indole-3-acetic acid (IAA) and siderophore, growth in nitrogen-free medium and solubilization of phosphate. Time course of growth and IAA production by the potent isolate Bacillus OPR 7 have been determined. Exploitation of such plant growth promoting endophytes appears to be one of the best options in increasing biomass yield and improving plant fitness and productivity.
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Affiliation(s)
- Ananya Mukherjee
- Microbiology Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Puja Bhattacharjee
- Microbiology Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Rituparna Das
- Microbiology Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Arundhati Pal
- Department of Botany, Serampore College, Serampore, Hooghly, India
| | - Amal K Paul
- Microbiology Laboratory, Department of Botany, University of Calcutta, Kolkata, India
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Xia QH, Zheng LP, Zhao PF, Wang JW. Biosynthesis of silver nanoparticles using Artemisia annua callus for inhibiting stem-end bacteria in cut carnation flowers. IET Nanobiotechnol 2017; 11:185-192. [PMID: 28477002 DOI: 10.1049/iet-nbt.2015.0125] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A biological method for synthesising silver nanoparticles (AgNPs) was developed using the callus extracts from Artemisia annua L. under sunlight at 25,000 lx. The AgNPs were characterised using transmission electron microscopy, atomic force microscope, X-ray diffraction and Fourier transform infrared spectroscopy. The AgNPs were mostly spherical with the size of 2.1 to 45.2 nm (average 10.9 nm). Pulse treatments of AgNPs at 125, 250 and 500 mg/l for 1 h extended vase life of cut carnation (Dianthus caryophyllus cv. Green Land) flowers. Four dominant bacteria strains Arthrobacter arilaitensis, Kocuria sp., Staphylococcus equorum and Microbacterium oxydans were isolated from the stem-ends of cut D. caryophyllus flowers. AgNP pulse inhibited significantly bacterial growth in vase solution and cut stem ends during all of the vase period. The bacteria related blockage in the stem-ends was significantly alleviated by AgNP pulse because of its higher antibacterial efficacy against the dominant bacteria. In addition, ethylene release of cut carnation flowers was inhibited in response to AgNP pulse. This is the first time that the biologically synthesised AgNPs could be applied as a promising preservative agent for cut carnation flowers.
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Affiliation(s)
- Qian Hua Xia
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, People's Republic of China
| | - Li Ping Zheng
- School of Architecture and Urban Environment, Soochow University, Suzhou 215123, People's Republic of China
| | - Pei Fei Zhao
- Flower Research Institute, Yunnan Academy of Agricultural Sciences, Kunming 650205, People's Republic of China
| | - Jian Wen Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, People's Republic of China.
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Chaudhry V, Patil PB. Genomic investigation reveals evolution and lifestyle adaptation of endophytic Staphylococcus epidermidis. Sci Rep 2016; 6:19263. [PMID: 26758912 PMCID: PMC4713051 DOI: 10.1038/srep19263] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 12/10/2015] [Indexed: 12/12/2022] Open
Abstract
Staphylococcus epidermidis is a major human associated bacterium and also an emerging nosocomial pathogen. There are reports of its association to rodents, sheep and plants. However, comparative and evolutionary studies of ecologically diverse strains of S. epidermidis are lacking. Here, we report the whole genome sequences of four S. epidermidis strains isolated from surface sterilized rice seeds along with genome sequence of type strain. Phylogenomic analysis of rice endophytic S. epidermidis (RESE) with “type strain” unequivocally established their species identity. Whole genome based tree of 93 strains of S. epidermidis revealed RESE as distinct sub-lineage which is more related to rodent sub-lineage than to majority of human lineage strains. Furthermore, comparative genomics revealed 20% variable gene-pool in S. epidermidis, suggesting that genomes of ecologically diverse strains are under flux. Interestingly, we were also able to map several genomic regions that are under flux and gave rise to RESE strains. The largest of these genomic regions encodes a cluster of genes unique to RESE that are known to be required for survival and stress tolerance, apart from those required for adaptation to plant habitat. The genomes and genes of RESE represent distinct ecological resource/sequences and provided first evolutionary insights into adaptation of S. epidermidis to plants.
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Affiliation(s)
- Vasvi Chaudhry
- CSIR- Institute of Microbial Technology, Sector 39A, Chandigarh-160036 (India)
| | - Prabhu B Patil
- CSIR- Institute of Microbial Technology, Sector 39A, Chandigarh-160036 (India)
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Analysis on evolutionary relationship of amylases from archaea, bacteria and eukaryota. World J Microbiol Biotechnol 2016; 32:24. [PMID: 26745984 PMCID: PMC4706583 DOI: 10.1007/s11274-015-1979-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 11/16/2015] [Indexed: 12/16/2022]
Abstract
Amylase is one of the earliest characterized enzymes and has many applications in clinical and industrial settings. In biotechnological industries, the amylase activity is enhanced through modifying amylase structure and through cloning and expressing targeted amylases in different species. It is important to understand how engineered amylases can survive from generation to generation. This study used phylogenetic and statistical approaches to explore general patterns of amylases evolution, including 3118 α-amylases and 280 β-amylases from archaea, eukaryota and bacteria with fully documented taxonomic lineage. First, the phylogenetic tree was created to analyze the evolution of amylases with focus on individual amylases used in biofuel industry. Second, the average pairwise p-distance was computed for each kingdom, phylum, class, order, family and genus, and its diversity implies multi-time and multi-clan evolution. Finally, the variance was further partitioned into inter-clan variance and intra-clan variance for each taxonomic group, and they represent horizontal and vertical gene transfer. Theoretically, the results show a full picture on the evolution of amylases in manners of vertical and horizontal gene transfer, and multi-time and multi-clan evolution as well. Practically, this study provides the information on the surviving chance of desired amylase in a given taxonomic group, which may potentially enhance the successful rate of cloning and expression of amylase gene in different species.
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Isolation and Molecular Identification of Endophytic Bacteria From Rambutan Fruits (Nephelium lappaceum L.) Cultivar Binjai. HAYATI JOURNAL OF BIOSCIENCES 2016. [DOI: 10.1016/j.hjb.2016.01.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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29
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Glassner H, Zchori-Fein E, Compant S, Sessitsch A, Katzir N, Portnoy V, Yaron S. Characterization of endophytic bacteria from cucurbit fruits with potential benefits to agriculture in melons (Cucumis melo L.). FEMS Microbiol Ecol 2015; 91:fiv074. [PMID: 26183916 DOI: 10.1093/femsec/fiv074] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2015] [Indexed: 11/14/2022] Open
Abstract
Endophytes are microorganisms that mainly colonize vegetative parts, but are also found in reproductive and disseminating organs, and may have beneficial characteristics. To identify microorganisms associated with the agriculturally important family, Cucurbitaceae, endophytes were initially determined in fruits of Cucumis melo Reticulatus Group 'Dulce' by a cultivation-independent approach based on fluorescence in situ hybridization using double labeling of oligonucleotide probes. Alpha-, Beta-, Gammaproteobacteria, Firmicutes and Actinobacteria were localized inside the fruits. Culturable bacteria were further isolated and identified from fruit tissues of 'Dulce', from fruits of other cultivated and wild-field-grown Cucurbitaceae, and from wild fruits growing under natural conditions. Low densities of culturable bacteria were detected in the investigated fruits, especially in four out of the five wild species, regardless of their growing environment. Substantial differences were observed between the wild and cultivated cucurbit taxa in regard to the number of colonized fruits as well as the type of endophytes. Bacillus was the most dominant genus of endophytes colonizing fruits of Cucurbitaceae. The antagonistic effects of isolated endophytes were assessed against cucurbit disease agents in dual-culture assays. Several bacterial isolates exhibited antagonistic properties against the tested plant pathogens. The identified bacteria may be useful for protecting plants not only in the field, but also for post-harvest.
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Affiliation(s)
- Hanoch Glassner
- Faculty of Biotechnology and Food Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel ARO, Dept. of Entomology, Newe Ya'ar Research Center 30095, Israel
| | | | - Stéphane Compant
- AIT Austrian Institute of Technology GmbH, Department of Health & Environment, Bioresources Unit, Konrad-Lorenz-Strasse 24, A-3430, Tulln, Austria
| | - Angela Sessitsch
- AIT Austrian Institute of Technology GmbH, Department of Health & Environment, Bioresources Unit, Konrad-Lorenz-Strasse 24, A-3430, Tulln, Austria
| | - Nurit Katzir
- ARO, Agricultural Research Organization, Dept. of Vegetable Crops, Newe Ya'ar Research Center 30095, Israel
| | - Vitaly Portnoy
- ARO, Agricultural Research Organization, Dept. of Vegetable Crops, Newe Ya'ar Research Center 30095, Israel
| | - Sima Yaron
- Faculty of Biotechnology and Food Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
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30
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Neera, Ramana KV, Batra HV. Occurrence of Cellulose-Producing Gluconacetobacter spp. in Fruit Samples and Kombucha Tea, and Production of the Biopolymer. Appl Biochem Biotechnol 2015; 176:1162-73. [DOI: 10.1007/s12010-015-1637-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Accepted: 04/21/2015] [Indexed: 10/23/2022]
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31
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A diverse community of jute (Corchorus spp.) endophytes reveals mutualistic host–microbe interactions. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-014-1001-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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32
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Nasopoulou C, Pohjanen J, Koskimäki JJ, Zabetakis I, Pirttilä AM. Localization of strawberry (Fragaria x ananassa) and Methylobacterium extorquens genes of strawberry flavor biosynthesis in strawberry tissue by in situ hybridization. JOURNAL OF PLANT PHYSIOLOGY 2014; 171:1099-1105. [PMID: 24973582 DOI: 10.1016/j.jplph.2014.03.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Revised: 03/20/2014] [Accepted: 03/23/2014] [Indexed: 06/03/2023]
Abstract
Strawberry flavor is one of the most popular fruit flavors worldwide, with numerous applications in the food industry. In addition, the biosynthetic origin of the most important strawberry flavor components, such as 2,5-dimethyl-4-hydroxy-2H-furan-3-one (DMHF), is a challenging research area. DMHF's precursor, 2-hydroxy-propanal (or lactaldehyde), is biosynthesized by the endophytic bacterium Methylobacterium extorquens (M. extorquens). In particular, the alcohol dehydrogenase (ADH) enzymes of M. extorquens are involved in the biogenesis of DMHF precursors since they have the capacity to oxidize the strawberry-derived 1,2-propanediol to lactaldehyde. In this study, the expression of the endophytic ADH and the plant DMHF biosynthesis genes was examined in the tissues of raw and ripe strawberry receptacles by in situ hybridization. The presence of endophytic bacteria was studied in the same tissues by probes targeting bacterial 16S ribosomal ribonucleic acid. Hybridization signals of probes specific for endophytic ADH and plant DMHF biosynthesis genes, as well as bacteria-specific probes, were detected in the same locations. The probes were localized near the plasma membranes or intercellular spaces of cortical and vascular tissues of the receptacle, and intracellularly in the tissues of achenes. By localizing the expression of the endophytic methanol ADH and plant DMHF biosynthesis genes to the same tissues, we have reinforced our original hypothesis that an intimate symbiotic relationship between strawberry and endophytic cells exists and leads to the biosynthesis of DMHF.
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Affiliation(s)
- Constantina Nasopoulou
- Department of Biology, University of Oulu, PO Box 3000, 90014, Oulu, Finland; Department of Chemistry, National and Kapodistrian University of Athens, Panepistimioupoli Zografou, 157 84, Athens, Greece.
| | - Johanna Pohjanen
- Department of Biology, University of Oulu, PO Box 3000, 90014, Oulu, Finland
| | - Janne J Koskimäki
- Department of Biology, University of Oulu, PO Box 3000, 90014, Oulu, Finland
| | - Ioannis Zabetakis
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimioupoli Zografou, 157 84, Athens, Greece
| | - Anna Maria Pirttilä
- Department of Biology, University of Oulu, PO Box 3000, 90014, Oulu, Finland
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Zhou J, Zhao X, Dai C. Antagonistic mechanisms of endophytic Pseudomonas fluorescens
against Athelia rolfsii. J Appl Microbiol 2014; 117:1144-58. [DOI: 10.1111/jam.12586] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 06/20/2014] [Accepted: 06/20/2014] [Indexed: 10/25/2022]
Affiliation(s)
- J.Y. Zhou
- Jiangsu Key Laboratory for Microbes and Functional Genomics; Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources; College of Life Sciences; Nanjing Normal University; Jiangsu Province Nanjing China
| | - X.Y. Zhao
- Jiangsu Key Laboratory for Microbes and Functional Genomics; Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources; College of Life Sciences; Nanjing Normal University; Jiangsu Province Nanjing China
| | - C.C. Dai
- Jiangsu Key Laboratory for Microbes and Functional Genomics; Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources; College of Life Sciences; Nanjing Normal University; Jiangsu Province Nanjing China
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Chen YT, Yuan Q, Shan LET, Lin MA, Cheng DQ, Li CY. Antitumor activity of bacterial exopolysaccharides from the endophyte Bacillus amyloliquefaciens sp. isolated from Ophiopogon japonicus.. Oncol Lett 2013; 5:1787-1792. [PMID: 23833642 PMCID: PMC3700801 DOI: 10.3892/ol.2013.1284] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 02/20/2013] [Indexed: 12/05/2022] Open
Abstract
The endophytic bacterium, MD-b1, was isolated from the medicinal plant Ophiopogon japonicas and identified as the Bacillus amyloliquefaciens sp. with 99% similarity based on the partial sequence analysis of 16S rDNA. Exopolysaccharides were extracted from the endophyte for the evaluation of its antitumor activity against gastric carcinoma cell lines (MC-4 and SGC-7901). 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays and microscopy were performed to estimate the cell viability and morphological changes of the MC-4 and SGC-7901 cells following treatment with the exopolysaccharides at 14, 22 and 30 μg/μl. The results revealed that the exopolysaccharides displayed concentration-dependent inhibitory effects against the MC-4 and SGC-7901 cells, with an IC50 of 19.7 and 26.8 μg/μl, respectively. The exopolysaccharides also induced morphological abnormalities in the cells. These effects indicated the the exopolysaccharides had an antitumoral mechanism of action associated with the mitochondrial dysfunction of the treated cells. This is the first study to investigate the endophytic microorganism isolated from O. japonicas and also the first discovery of such antitumoral exopolysaccharides derived from the genus Bacillus. This provides a promising and reproducible natural product source with high therapeutic value for anticancer treatment, thereby facilitating the development of new anticancer agents.
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Affiliation(s)
- Yi-Tao Chen
- Colleges of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, P.R. China ; Life Science, Zhejiang Chinese Medical University, Hangzhou 310053, P.R. China
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