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Chhetri G, Kim MJ, Kim I, Tran DVH, Kim YW, Kim HW, Seo T. Streptomyces tagetis sp. nov., a chromomycin producing bacteria isolated from the roots of Tagetes patula. Front Microbiol 2024; 15:1361583. [PMID: 38495511 PMCID: PMC10940327 DOI: 10.3389/fmicb.2024.1361583] [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: 12/26/2023] [Accepted: 02/08/2024] [Indexed: 03/19/2024] Open
Abstract
A novel halotolerant actinobacterium, designated as RG38T, capable of producing black extracellular melanin pigment on SP2 agar, was isolated from the roots of Tagetes patula. Comparative analysis of the 16S rRNA gene sequence revealed the highest similarity to Streptomyces collinus NBRC 12759T (99.3%). Phylogenetic analysis showed that strain RG38T clustered within the genus Streptomyces forming a monophyletic cluster with its close relatives. The average nucleotide identity (ANI), digital DNA-DNA hybridization (dDDH), and amino-acid identity (AAI) values between strain RG38T and related species within the genus Streptomyces were below the standard threshold for prokaryotic species delineation. The DNA G + C content of the strain RG38T was determined to be 73.3%. The genome size measured 7,150,598 bp comprising 17 contigs and encompassed 6,053 protein coding genes. AntiSMASH analysis of the whole genome revealed 35 putative biosynthetic gene clusters (BGCs) responsible for various secondary metabolites. Among these clusters, two gene clusters exhibited 100% similarity to the chromomycin A3, albaflavenone, and anthracimycin, respectively. These compounds were reported to possess significant anticancer and antibacterial activities. LC-MS-based analysis, coupled with further isolation studies, confirmed the production of chromomycins A2 (1), A3 (2), and their derivatives, along with their antibiotic activities. These findings underscore the potential of this novel strain as a novel resource for the discovery of diverse antimicrobial compounds. This study is the first to report an antimicrobial compound producing Streptomyces species isolated from medicinal plant T. patula. Based on a polyphasic study, the strain RG38T isolated from an unexplored habitat with a high potential for new natural products represents a novel species within the genus Streptomyces. Accordingly, we propose the name Streptomyces tagetis sp. nov. for this novel species, with the type strain is RG38T (=KCTC 49624T = TBRC 15113T).
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Affiliation(s)
- Geeta Chhetri
- Department of Life Science, Dongguk University-Seoul, Goyang, Republic of Korea
| | - Myeong Ji Kim
- College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang, Republic of Korea
| | - Inhyup Kim
- Department of Life Science, Dongguk University-Seoul, Goyang, Republic of Korea
| | - Duc V. H. Tran
- College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang, Republic of Korea
| | - Young-Woo Kim
- College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang, Republic of Korea
| | - Hyun Woo Kim
- College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang, Republic of Korea
| | - Taegun Seo
- Department of Life Science, Dongguk University-Seoul, Goyang, Republic of Korea
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Mahlangu SG, Zulu N, Serepa-Dlamini MH, Tai SL. Isolation, identification, and biological characterization of bacterial endophytes isolated from Gunnera perpensa L. FEMS Microbiol Lett 2024; 371:fnae056. [PMID: 39039013 PMCID: PMC11321073 DOI: 10.1093/femsle/fnae056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 05/23/2024] [Accepted: 07/18/2024] [Indexed: 07/24/2024] Open
Abstract
In the present study, eleven endophytic bacterial strains, Herbaspirillum sp. (GP-SGM1, GP-SGM2, GP-SGM3, and GP-SGM11), Pseudomonas sp. (GP-SGM4, GP-SGM5), Novosphingobium sp. GP-SGM6, Chryseobacterium sp. GP-SGM7, Labedella sp. GP-SGM8, Brevibacterium sp. GP-SGM9, and Pseudomonas sp. GP-SGM10, were isolated from the rhizomes of Gunnera perpensa L. The growth kinetics, assessed through maximum growth rates (μmax) and optical density (OD) values, revealed that GP-SGM7 exhibited highest μmax values of 0.33 ± 0.01 hours (h)-1 with an OD of 4.20 ± 0.04. In contrast, GP-SGM11 exhibited the lowest μmax of 0.12 ± 0.05 h-1 and the smallest OD of 1.50 ± 0.00. In addition, the endophyte crude extracts were tested for antibacterial activity against five pathogenic strains using the disk diffusion method, with GP-SGM7 crude extracts exhibiting promising antibacterial activity against Klebsiella pneumoniae and Staphylococcus aureus. Antioxidant activity was determined by DPPH (2, 2-diphenyl-1-picrylhydrazyl) and FRAP (ferric reducing antioxidant power) assays. The crude extracts of GP-SGM1, GP-SGM7, GP-SGM9, and GP-SGM10 were the most effective at scavenging DPPH radicals, with GP-SGM7 also exhibiting a high FRAP value of 0.54 ± 0.01. These findings emphasize the therapeutic potential of endophytic bacteria from G. perpensa L. in addressing skin-related issues, including bacterial infections and free radicals.
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Affiliation(s)
- Siphiwe Godfrey Mahlangu
- Department of Chemical Engineering, Centre for Bioprocess Engineering Research, University of Cape Town, Private Bag X3, Rondebosch, Cape Town 7701, South Africa
| | - Nodumo Zulu
- Department of Chemical Engineering, Centre for Bioprocess Engineering Research, University of Cape Town, Private Bag X3, Rondebosch, Cape Town 7701, South Africa
| | - Mahloro Hope Serepa-Dlamini
- Department of Biotechnology and Food Technology, University of Johannesburg, Doornfontein Campus, PO Box 17011, Johannesburg 2028, South Africa
| | - Siew Leng Tai
- Department of Chemical Engineering, Centre for Bioprocess Engineering Research, University of Cape Town, Private Bag X3, Rondebosch, Cape Town 7701, South Africa
- Department of Chemical Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
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Shahdadi F, Khorasani S, Salehi-Sardoei A, Fallahnajmabadi F, Fazeli-Nasab B, Sayyed RZ. GC-MS profiling of Pistachio vera L., and effect of antioxidant and antimicrobial compounds of it's essential oil compared to chemical counterparts. Sci Rep 2023; 13:21694. [PMID: 38066078 PMCID: PMC10709598 DOI: 10.1038/s41598-023-48844-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 11/30/2023] [Indexed: 12/18/2023] Open
Abstract
All elements of the pistachio tree are considered raw pistachio by-products. The soft hull makes up the majority of these by-products. It contains proteins, fats, minerals, vitamins, phenolics contents (TPC), and antioxidants. Early smiling pistachios are one of the most important sources of pistachio contamination with aflatoxin in the garden and processing stages. The present study aimed to evaluate pistachio hull essential oil (EO) composition, and antioxidant and antimicrobial properties under in vitro conditions. TPC, antioxidant, and antimicrobial activity were measured using the Folin-Ciocalteu reagent, 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging method, and serial dilution titration method, respectively. A gas chromatography system with a mass spectrometer (GC-MS) was utilized to determine the chemical components of the EO. The findings revealed that the quantity of TPC and anti-radical activity in IC50 were 245.43 mg gallic acid/mL and 206.32 µL/L, respectively. The free radical absorption activity of DPPH (%) increased with EO content. The inhibitory activity of EO on Staphylococcus aureus and Bacillus subtilis was much lower than that of streptomycin and penicillin. Aspergillus flavus was effectively inhibited by pistachio hull EO, comparable to fluconazole. The results obtained from GC-MS showed that the major compounds in pistachio hull essential oil include α-pinene (47.36%), terpinolene (10.57%), limonene (9.13%), and L-bornyl acetate (8.57%). The findings indicated that pistachio hull EO has potent antibacterial and antioxidant components and can be employed as a natural antimicrobial and antioxidant in food systems.
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Affiliation(s)
- Fatemeh Shahdadi
- Food Science and Technology Department, Faculty of Agriculture, University of Jiroft, Jiroft, 7867155311, Iran
| | - Sepideh Khorasani
- Food Science and Technology Department, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, 7616913439, Iran
| | - Ali Salehi-Sardoei
- Department of Horticulture, Faculty of Plant Production, Gorgan University of Agriculture and Natural Resources, Gorgan, Iran
| | | | - Bahman Fazeli-Nasab
- Department of Agronomy and Plant Breeding, Agriculture Institute, Research Institute of Zabol, Zabol, 9861335884, Iran.
| | - R Z Sayyed
- Department of Microbiology, PSGVP Mandal's S I Patil Arts, G B Patel Science and STKVS Commerce College, Shahada, 425409, India.
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Jung H, Lee D, Lee S, Kong HJ, Park J, Seo YS. Comparative genomic analysis of Chryseobacterium species: deep insights into plant-growth-promoting and halotolerant capacities. Microb Genom 2023; 9:001108. [PMID: 37796250 PMCID: PMC10634447 DOI: 10.1099/mgen.0.001108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 09/17/2023] [Indexed: 10/06/2023] Open
Abstract
Members of the genus Chryseobacterium have attracted great interest as beneficial bacteria that can promote plant growth and biocontrol. Given the recent risks of climate change, it is important to develop tolerance strategies for efficient applications of plant-beneficial bacteria in saline environments. However, the genetic determinants of plant-growth-promoting and halotolerance effects in Chryseobacterium have not yet been investigated at the genomic level. Here, a comparative genomic analysis was conducted with seven Chryseobacterium species. Phylogenetic and phylogenomic analyses revealed niche-specific evolutionary distances between soil and freshwater Chryseobacterium species, consistent with differences in genomic statistics, indicating that the freshwater bacteria have smaller genome sizes and fewer genes than the soil bacteria. Phosphorus- and zinc-cycling genes (required for nutrient acquisition in plants) were universally present in all species, whereas nitrification and sulphite reduction genes (required for nitrogen- and sulphur-cycling, respectively) were distributed only in soil bacteria. A pan-genome containing 6842 gene clusters was constructed, which reflected the general features of the core, accessory and unique genomes. Halotolerant species with an accessory genome shared a Kdp potassium transporter and biosynthetic pathways for branched-chain amino acids and the carotenoid lycopene, which are associated with countermeasures against salt stress. Protein-protein interaction network analysis was used to define the genetic determinants of Chryseobacterium salivictor NBC122 that reduce salt damage in bacteria and plants. Sixteen hub genes comprised the aromatic compound degradation and Por secretion systems, which are required to cope with complex stresses associated with saline environments. Horizontal gene transfer and CRISPR-Cas analyses indicated that C. salivictor NBC122 underwent more evolutionary events when interacting with different environments. These findings provide deep insights into genomic adaptation to dynamic interactions between plant-growth-promoting Chryseobacterium and salt stress.
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Affiliation(s)
- Hyejung Jung
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
- Biotechnology Research Division, National Institute of Fisheries Science, Busan 46083, South Korea
| | - Duyoung Lee
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
| | - Seungchul Lee
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
| | - Hee Jeong Kong
- Biotechnology Research Division, National Institute of Fisheries Science, Busan 46083, South Korea
| | - Jungwook Park
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
- Biotechnology Research Division, National Institute of Fisheries Science, Busan 46083, South Korea
| | - Young-Su Seo
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
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Lin T, Tang J, Li S, Li S, Han S, Liu Y, Yang C, Chen G, Chen L, Zhu T. Drought stress-mediated differences in phyllosphere microbiome and associated pathogen resistance between male and female poplars. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 115:1100-1113. [PMID: 37177875 DOI: 10.1111/tpj.16283] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 05/04/2023] [Accepted: 05/10/2023] [Indexed: 05/15/2023]
Abstract
Phyllosphere-associated microbes play a crucial role in plant-pathogen interactions while their composition and diversity are strongly influenced by drought stress. As dioecious plant species exhibited secondary dimorphism between the two sexes in response to drought stress, whether such difference will lead to sex-specific differences in phyllosphere microbiome and associated pathogen resistance between male and female conspecifics is still unknown. In this study, we subjected female and male full siblings of a dioecious poplar species to a short period of drought treatment followed by artificial infection of a leaf pathogenic fungus. Our results showed that male plants grew better than females with or without drought stress. Female control plants had more leaf lesion area than males after pathogen infection, whereas drought stress reversed such a difference. Further correlation and in vitro toxicity tests suggested that drought-mediated sexual differences in pathogen resistance between the two plant sexes could be attributed to the shifts in structure and function of phyllosphere-associated microbiome rather than the amount of leaf main defensive chemicals contained in plant leaves. Supportively, the microbiome analysis through high-throughput sequencing indicated that female phyllosphere enriched a higher abundance of ecologically beneficial microbes that serve as biological plant protectants, while males harbored abundant phytopathogens under drought-stressed conditions. The results could provide potential implications for the selection of suitable poplar sex to plants in drought or semi-drought habitats.
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Affiliation(s)
- Tiantian Lin
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
- Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China and Centre of Invasion Biology, Institute of Biodiversity, Yunnan University, 650504, Kunming, China
| | - Jiayao Tang
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Shuying Li
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Shujiang Li
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Shan Han
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Yinggao Liu
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Chunlin Yang
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Gang Chen
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Lianghua Chen
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
| | - Tianhui Zhu
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, Key Laboratory of Forest Protection of Sichuan Education Department, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China
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Jung Y, Chhetri G, Kim I, So Y, Park S, Woo H, Lee KH, Seo T. Chryseobacterium edaphi sp. nov. and Chryseobacterium gilvum sp. nov., isolated from soil. Int J Syst Evol Microbiol 2023; 73. [PMID: 37490399 DOI: 10.1099/ijsem.0.005989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023] Open
Abstract
Two Gram-stain-negative, aerobic, yellow and rod-shaped bacteria, designated as strains PBS4-4T and GMJ5T, were isolated from soil samples collected in Goyang-si and Paju-si, Gyeonggi-do, Republic of Korea. Strains PBS4-4T and GMJ5T were both positive for catalase and oxidase. Strain PBS4-4T grew at 15-37 °C and pH 5.0-12.0. Strain GMJ5T grew at 15-37 °C and pH 5.0-11.0. Neither strain required NaCl for growth. 16S rRNA sequence analysis revealed that strains PBS4-4T and GMJ5T form a closely related cluster with the genus Chryseobacterium. The average nucleotide identity and digital DNA-DNA hybridization values between strain PBS4-4T and its closely related strains were 79.4-84.5% and 23.2-28.7 %, respectively. For GMJ5T, the values were 78.3-79.3% and 22.0-22.6 %, respectively. The major fatty acids shared by both novel strains were iso-C15 : 0 and summed feature 3 (C16 : 1 ω7c/C16 : 1 ω6c). Strain GMJ5T had one other major fatty acid: iso-C17 : 0 3OH. Based on phenotypic, genomic and phylogenetic results, strains PBS4-4T and GMJ5T represent novel species within the genus Chryseobacterium, and the names Chryseobacterium edaphi sp. nov. and Chryseobacterium gilvum sp. nov. are proposed, respectively. The type strain of C. edaphi is PBS4-4T (=KACC 22882T=TBRC 17052T) and the type strain of C. gilvum is GMJ5T (=KACC 22883T=TBRC 17053T).
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Affiliation(s)
- Yonghee Jung
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
| | - Geeta Chhetri
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
| | - Inhyup Kim
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
| | - Yoonseop So
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
| | - Sunho Park
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
| | - Haejin Woo
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
| | - Ki-Ho Lee
- Department of Biochemistry and Molecular Biology, College of Medicine, Eulji University, Daejeon 34824, Republic of Korea
| | - Taegun Seo
- Department of Life Science, Dongguk University-Seoul, Goyang, 10326, Republic of Korea
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Gomes A, Narciso R, Regalado L, Pinheiro MC, Barros F, Sario S, Santos C, Mendes RJ. Disclosing the native blueberry rhizosphere community in Portugal-an integrated metagenomic and isolation approach. PeerJ 2023; 11:e15525. [PMID: 37397024 PMCID: PMC10312161 DOI: 10.7717/peerj.15525] [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: 03/03/2023] [Accepted: 05/18/2023] [Indexed: 07/04/2023] Open
Abstract
Backgorund The production of red fruits, such as blueberry, has been threatened by several stressors from severe periods of drought, nutrient scarcity, phytopathogens, and costs with fertilization programs with adverse consequences. Thus, there is an urgent need to increase this crop's resilience whilst promoting sustainable agriculture. Plant growth-promoting microorganisms (PGPMs) constitute not only a solution to tackle water and nutrient deficits in soils, but also as a control against phytopathogens and as green compounds for agricultural practices. Methods In this study, a metagenomic approach of the local fungal and bacterial community of the rhizosphere of Vaccinium corymbosum plants was performed. At the same time, both epiphytic and endophytic microorganisms were isolated in order to disclose putative beneficial native organisms. Results Results showed a high relative abundance of Archaeorhizomyces and Serendipita genera in the ITS sequencing, and Bradyrhizobium genus in the 16S sequencing. Diversity analysis disclosed that the fungal community presented a higher inter-sample variability than the bacterial community, and beta-diversity analysis further corroborated this result. Trichoderma spp., Bacillus spp., and Mucor moelleri were isolated from the V. corymbosum plants. Discussion This work revealed a native microbial community capable of establishing mycorrhizal relationships, and with beneficial physiological traits for blueberry production. It was also possible to isolate several naturally-occurring microorganisms that are known to have plant growth-promoting activity and confer tolerance to hydric stress, a serious climate change threat. Future studies should be performed with these isolates to disclose their efficiency in conferring the needed resilience for this and several crops.
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Affiliation(s)
- Anicia Gomes
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Rodrigo Narciso
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Laura Regalado
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Margarida Cardeano Pinheiro
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Filipa Barros
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Sara Sario
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Conceição Santos
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Rafael J. Mendes
- Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
- LAQV-REQUIMTE, Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
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Xiang X, Yi X, Zheng W, Li Y, Zhang C, Wang X, Chen Z, Huang M, Ying GG. Enhanced biodegradation of thiamethoxam with a novel polyvinyl alcohol (PVA)/sodium alginate (SA)/biochar immobilized Chryseobacterium sp H5. JOURNAL OF HAZARDOUS MATERIALS 2023; 443:130247. [PMID: 36345060 DOI: 10.1016/j.jhazmat.2022.130247] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 10/18/2022] [Accepted: 10/21/2022] [Indexed: 06/16/2023]
Abstract
Long-term and extensive usage of thiamethoxam, the second-generation neonicotinoid insecticide, has caused a serious threat to non-target organisms and ecological security. Efficient immobilized microorganism techniques are a sustainable solution for bioremediation of thiamethoxam contamination. A Gram-negative aerobic bacterium Chryseobacterium sp H5 with high thiamethoxam-degrading efficiencies was isolated from activated sludge. Then we developed a novel polyvinyl alcohol (PVA)/sodium alginate (SA)/biochar bead with this functional microbe immobilization to enhance the biodegradation and removal of thiamethoxam. Results indicated that the total removal and biodegradation rate of thiamethoxam with PVA/SA/biochar (0.7 %) beads with Chryseobacterium sp H5 immobilization at 30 °C and pH of 7.0 within 7 d reached about 90.47 % and 68.03 %, respectively, much higher than that using PVA/SA immobilized microbes (75.06 %, 56.05 %) and free microbes (61.72 %). Moreover, the PVA/SA/biochar (0.7 %) immobilized microbes showed increased tolerance to extreme conditions. Biodegradation metabolites of thiamethoxam were identified and two intermediates were first reported. Based on the identified biodegradation intermediates, cleavage of C-N between the 2-chlorothiazole ring and oxadiazine, dichlorination, nitrate reduction and condensation reaction would be the major biodegradation routes of thiamethoxam. Results of this work suggested the novel PVA/SA/biochar beads with Chryseobacterium sp H5 immobilization would be helpful for the effective bioremediation of thiamethoxam contamination.
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Affiliation(s)
- Xuezhu Xiang
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China
| | - Xiaohui Yi
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, PR China.
| | - Wanbing Zheng
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China
| | - Yingqiang Li
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China
| | - Chao Zhang
- School of Civil Engineering & Transportation, South China University of Technology, Guangzhou 510640, PR China
| | - Xinzhi Wang
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China
| | - Zhenguo Chen
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China
| | - Mingzhi Huang
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, PR China; School of Resources and Environmental Sciences, Quanzhou Normal University, Quanzhou, Fujian 362000, PR China.
| | - Guang-Guo Ying
- SCNU Environmental Research Institute, School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, PR China
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Chhetri G, Kim I, Kim J, So Y, Park S, Jung Y, Seo T. Paraburkholderia tagetis sp. nov., a novel species isolated from roots of Tagetes patula enhances the growth and yield of Solanum lycopersicum L. (tomato). Front Microbiol 2023; 14:1140484. [PMID: 37082173 PMCID: PMC10110911 DOI: 10.3389/fmicb.2023.1140484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 03/21/2023] [Indexed: 04/22/2023] Open
Abstract
A multifunctional, Gram-stain-negative, aerobic, motile by flagella, short-rod shaped bacteria, designated strain RG36T was isolated from roots of marigold plant (Tagetes patula) sampled at Dongguk University, Republic of Korea. A 16S rRNA sequences indicated that the closest phylogenetic neighbors were Paraburkholderia acidiphila 7Q-K02T (99.0%) and Paraburkholderia sacchari IPT101T (98.9%) of the family Burkholderiaceae. The draft genome size was 8.52 Mb (63.7% GC). The genome contained 7,381 coding sequences. Digital DNA-DNA hybridization (dDDH) and average nucleotide identity (ANI) values of strain RG36T with its most closely related species were only 83.1-88.7 and 27.6-36.7%, respectively. Strain RG36T contained Q-8 as the major respiratory quinone and its main fatty acids (>10%) were C16:0, C17:0 cyclo, C19:0 cyclo ω8c, and summed feature 8 (comprising C18:1 ω7c and/or C18:1 ω6c). Strain RG36T accumulates polyhydroxybutyrates (PHB) and exhibits multiple plant growth-promoting properties including production of indole-3-acetic acid (IAA), siderophores, protease, phosphate solubilization, and harboring gene clusters for its multifunctional properties. A pot experiment was conducted to evaluate the effect of PGPR on the growth of Solanum lycopersicum L. (Tomato). Result also confirmed the ability of strain RG36T to promote tomato plant growth, especially it increases the yield of tomatoes. Structural assessment of the bioplastic by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and GC-MS spectroscopy, which confirmed the structure of the polymer as PHB. Our study revealed the potential of strain RG36T to promote the growth of tomato plant and fruit yield by stimulating the various phytohormones, which could be use as bio-fertilizers to reduce the use of chemical fertilizers and promotes sustainable agricultural production. The phenotypic, chemotaxonomic and phylogenetic data, and genome analysis showed that strain RG36T represents a novel species of the genus Paraburkholderia, for which the name Paraburkholderia tagetis sp. nov. is proposed. The type strain is RG36T (=KACC 22685T = TBRC 15696T).
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Lazuardi M, Suharjono S, Chien CH, He JL, Lee CW, Peng CK, Sukmanadi M, Sugihartuti R, Maslachah L. Toxicity test of flavonoid compounds from the leaves of Dendrophthoe pentandra (L.) Miq. using in vitro culture cell models. Vet World 2022; 15:2896-2902. [PMID: 36718322 PMCID: PMC9880835 DOI: 10.14202/vetworld.2022.2896-2902] [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: 06/17/2022] [Accepted: 11/09/2022] [Indexed: 12/24/2022] Open
Abstract
Background and Aim The flavonoids from mistletoe are thought to have antimicrobial action. This encouraging finding supports the benefits of medicinal plants as a substitute for synthetic antimicrobials, thus promoting healthy lifestyles. In contrast, it is known that the use of topical drug formulations made from flavonoids of mistletoe (Dendrophthoe pentandra (L.) Miq. Loranthaceae) with Indonesian name, Benalu duku (BD) is required in skin cell irritation. This study aimed to assess the toxic effects of the flavonoid substances of BD, as an initial screening. Materials and Methods A myeloma cell line was cultured in Roswell Park Memorial Institute medium, and the Baby Hamster Kidney clone 12 (BHK21) cell line was cultured in Dulbecco's Modified Eagle's Medium from stock (±9 × 107 cells/mL), and 1.2 mL of culture were distributed into each well of a microtiter plate. Subsequently, 0.2 mL of serially diluted flavonoid compounds (0.5-3 μg/mL) were added to 12 wells for each concentration, as trial groups (including control groups), followed by a 2-day incubation. Observations were performed based on the cytopathic effect (CPE) using an inverted microscope at a magnification of 100×. Results Cytopathic effect was detected on the microtiter plate wells for the groups of myeloma and BHK21 cells at a flavonoid concentration of 0.5 μg/mL-3 μg/mL. Conclusion Flavonoid compounds from BD were safely used for topical treatment of cancer cells at a concentration <2.491 μg/mL, whereas for non-cancerous cells, a concentration <2.582 μg/mL was sufficient (p < 0.05).
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Affiliation(s)
- Mochamad Lazuardi
- Sub-division Veterinary-Pharmacy, Faculty of Veterinary Medicine, Universitas Airlangga, Mulyorejo Road, 60115, Surabaya, Indonesia,Corresponding author: Mochamad Lazuardi, e-mail: Co-authors: SS: , CC: , JH: , CL: , CP: , MS: , RS: , LM:
| | - Suharjono Suharjono
- Department of Pharmaceutics, Faculty of Pharmacy, Universitas Airlangga, Mulyorejo Road, 60115, Surabaya, Indonesia
| | - Chi-Hsien Chien
- Department of Veterinary Medicine, Asia University, No. 500, Lioufeng Road, Wufeng District, Taichung 41354, Taiwan
| | - Jie-Long He
- Department of Veterinary Medicine, Asia University, No. 500, Lioufeng Road, Wufeng District, Taichung 41354, Taiwan
| | - Chi-Wen Lee
- Department of Veterinary Medicine, Asia University, No. 500, Lioufeng Road, Wufeng District, Taichung 41354, Taiwan
| | - Chia-Kang Peng
- Department of Veterinary Medicine, Asia University, No. 500, Lioufeng Road, Wufeng District, Taichung 41354, Taiwan
| | - Mohammad Sukmanadi
- Sub-division Veterinary-Pharmacy, Faculty of Veterinary Medicine, Universitas Airlangga, Mulyorejo Road, 60115, Surabaya, Indonesia
| | - Rahmi Sugihartuti
- Sub-division Veterinary-Pharmacy, Faculty of Veterinary Medicine, Universitas Airlangga, Mulyorejo Road, 60115, Surabaya, Indonesia
| | - Lilik Maslachah
- Sub-division Veterinary-Pharmacy, Faculty of Veterinary Medicine, Universitas Airlangga, Mulyorejo Road, 60115, Surabaya, Indonesia
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Dadzie FA, Moles AT, Erickson TE, Slavich E, Muñoz‐Rojas M. Native bacteria and cyanobacteria can influence seedling emergence and growth of native plants used in dryland restoration. J Appl Ecol 2022. [DOI: 10.1111/1365-2664.14293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frederick A. Dadzie
- Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences UNSW Sydney Sydney New South Wales Australia
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences UNSW Sydney Sydney New South Wales Australia
| | - Angela T. Moles
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences UNSW Sydney Sydney New South Wales Australia
| | - Todd E. Erickson
- School of Biological Sciences University of Western Australia Crawley Western Australia Australia
- Kings Park Science, Department of Biodiversity, Conservation and Attractions Kings Park Western Australia Australia
| | - Eve Slavich
- School of Mathematics and Statistics UNSW Sydney Sydney New South Wales Australia
| | - Miriam Muñoz‐Rojas
- Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences UNSW Sydney Sydney New South Wales Australia
- Department of Plant Biology and Ecology University of Seville Seville Spain
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An Isolated Arthrobacter sp. Enhances Rice ( Oryza sativa L.) Plant Growth. Microorganisms 2022; 10:microorganisms10061187. [PMID: 35744704 PMCID: PMC9228311 DOI: 10.3390/microorganisms10061187] [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: 05/23/2022] [Revised: 06/07/2022] [Accepted: 06/07/2022] [Indexed: 12/28/2022] Open
Abstract
Rice is a symbol of life and a representation of prosperity in South Korea. However, studies on the diversity of the bacterial communities in the rhizosphere of rice plants are limited. In this study, four bundles of root samples were collected from the same rice field located in Goyang, South Korea. These were systematically analyzed to discover the diversity of culturable bacterial communities through culture-dependent methods. A total of 504 culturable bacteria were isolated and evaluated for their plant growth-promoting abilities in vitro. Among them, Arthrobacter sp. GN70 was selected for inoculation into the rice plants under laboratory and greenhouse conditions. The results showed a significantly positive effect on shoot length, root length, fresh plant weight, and dry plant weight. Moreover, scanning electron microscopic (SEM) images demonstrated the accumulation of bacterial biofilm networks at the junction of the primary roots, confirming the root-colonizing ability of the bacterium. The strain also exhibited a broad spectrum of in vitro antimicrobial activities against bacteria and fungi. Here, we first report the rice plant growth-promoting ability of the Arthrobacter species with the biofilm-producing and antimicrobial activities against plant and human pathogens. Genome analyses revealed features attributable to enhance rice plant growth, including the genes involved in the synthesis of plant hormones, biofilm production, and secondary metabolites. This study revealed that the rhizobacteria isolated from the roots of rice plants have dual potential to be utilized as a plant growth promoter and antimicrobial agent.
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