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Cao Y, Li Z, Du P, Ji J, Sun W, Xu J, Liang B. Effects of different dwarfing interstocks on the rhizosphere, endophytic bacteria, and drought resistance of apple trees. Microbiol Res 2024; 283:127690. [PMID: 38461571 DOI: 10.1016/j.micres.2024.127690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/06/2024] [Accepted: 03/08/2024] [Indexed: 03/12/2024]
Abstract
Rootstock is commonly used to enhance plant resistance to drought stress. However, it is necessary to investigate the effects of different rootstock, interstock, and scion combinations on rhizosphere and root endophytic bacteria under drought stress. We conducted a pot experiment to investigate how interstock [SH40, Jizhen 1 (J1), and Jizhen 2 (J2)] affects the drought tolerance and nitrogen (N) uptake and utilization of apple trees under drought stress. The results showed that the total dry weight, total chlorophyll content, carotenoid content, photosynthesis rate, and N absorption and utilization efficiency of apple trees decreased significantly, whereas relative electrolyte leakage increased significantly under drought stress. Membership function analysis showed that the apple plants with the J1 interstock had the greatest drought resistance. In addition, drought treatment significantly affected the diversity and composition of rhizosphere and root endophytic communities in all three rootstock/interstock/scion combinations. Further analysis revealed that the relative abundance of the plant pathogen Ralstonia was significantly increased in J2 drought-treated roots, compared to the other groups, whereas those of some potentially beneficial bacteria (0134_terrestrial_group, Phenylobacterium, Ellin6067, Kribbella, Chloronema, and Streptomyces) increased significantly in the J1 drought-treated sample. Co-occurrence network analysis showed that some potentially beneficial bacteria (Ellin6067, S0134_terrestrial_group, Pedomicrobium, and Subgroup_10) were significantly positively correlated with N content. These modifications of the rhizosphere and endophytic bacterial communities may influence the drought resilience and N uptake efficiency of different combinations of interstocks and scions. This study is a much-needed step towards understanding the stress response mechanism of scion-rootstock combinations.
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Affiliation(s)
- Yang Cao
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Zhongyong Li
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Peihua Du
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Jiahao Ji
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Wei Sun
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Jizhong Xu
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Bowen Liang
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China.
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Botlagunta N, Babu S. Growth enhancement and changes in bacterial microbiome of cucumber plants exhibited by biopriming with some native bacteria. Saudi J Biol Sci 2024; 31:103997. [PMID: 38646566 PMCID: PMC11031772 DOI: 10.1016/j.sjbs.2024.103997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 04/01/2024] [Accepted: 04/14/2024] [Indexed: 04/23/2024] Open
Abstract
This study investigated the impact of a mixture of six endophytic bacterial strains isolated from cucumber plants on the growth and microbiome diversity of six cucumber traditional varieties and hybrids. Six bacterial species were isolated and identified by 16 s rRNA sequencing. All the bacteria showed plant growth promoting traits. Bacillus tequilensis showed 80 % inhibition of the mycelia growth of Fusarium oxysporum f.sp. cucumarinum (Foc). Mixed culture of all the bacteria was prepared and applied back to the varieties and hybrids of cucumber plants through seed soaking. Plant growth characteristics indicated that the treated plants showed increased plant growth in terms of plant height, number of leaves, vine length, male:female flower ratio, number of fruits and fruit length. Bacteria treated plants of hybrid HiVeg Chitra recorded 19 cm increase in vine length compared to control plants. The matataxonomic analysis of leaf samples by Illumina sequencing highlighted a diverse bacterial community shift in treated plants, with significant increases in genera like Bacillus and Staphylococcus. The core microbiome analysis identified key genera such as Bacillus, Staphylococcus, Sphingomonas, Methylobacterium, etc that could be pivotal in plant growth promotion. Bacillus and Staphylococcus showed increased abundance in treated varieties, correlating with the observed in plant growth parameters thus indicating their role in growth promotion of cucumber plants. Endophytic bacterial species identified from cucumber plants when re-applied by seed soaking, they promote the plant growth by modulating the microbiome. The bacterial species identified in the study could be potential candidates as microbial bioinputs for cucumber cultivation.
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Affiliation(s)
- Navya Botlagunta
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, India
| | - Subramanian Babu
- VIT School of Agricultural Innovations and Advanced Learning (VAIAL), Vellore Institute of Technology, Vellore 632014, India
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Zhang JZ, Li XZ, Yin YB, Luo SC, Wang DX, Zheng H, Liu YX. High-throughput sequencing-based analysis of the composition and diversity of the endophyte community in roots of Stellera chamaejasme. Sci Rep 2024; 14:8607. [PMID: 38615120 PMCID: PMC11016073 DOI: 10.1038/s41598-024-59055-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 04/06/2024] [Indexed: 04/15/2024] Open
Abstract
Stellera chamaejasme (S. chamaejasme) is an important medicinal plant with heat-clearing, detoxifying, swelling and anti-inflammatory effects. At the same time, it is also one of the iconic plants of natural grassland degradation in northwest China, playing a key role in the invasion process. Plant endophytes live in healthy plant tissues and can synthesize substances needed for plant growth, induce disease resistance in host plants, and enhance plant resistance to environmental stress. Therefore, studying the root endophytes of S. chamaejasme is of great significance for mining beneficial microbial resources and biological prevention and control of S. chamaejasme. This study used Illumina MiSeq high-throughput sequencing technology to analyze the composition and diversity of endophytes in the roots of S. chamaejasme in different alpine grasslands (BGC, NMC and XGYZ) in Tibet. Research results show that the main phylum of endophytic fungi in the roots of S. chamaejasme in different regions is Ascomycota, and the main phyla of endophytic bacteria are Actinobacteria, Proteobacteria and Firmicutes (Bacteroidota). Overall, the endophyte diversity of the NMC samples was significantly higher than that of the other two sample sites. Principal coordinate analysis (PCoA) and permutational multivariate analysis of variance (PERMANOVA) results showed significant differences in the composition of endophytic bacterial and fungal communities among BGC, NMC and XGYZ samples. Co-occurrence network analysis of endophytes showed that there were positive correlations between fungi and some negative correlations between bacteria, and the co-occurrence network of bacteria was more complex than that of fungi. In short, this study provides a vital reference for further exploring and utilizing the endophyte resources of S. chamaejasme and an in-depth understanding of the ecological functions of S. chamaejasme endophytes.
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Affiliation(s)
- Jun-Ze Zhang
- Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa, China
| | - Xin-Zhong Li
- Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa, China
| | - Ye-Bing Yin
- Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa, China
| | - Si-Cen Luo
- Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa, China
| | - Dong-Xu Wang
- Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa, China
| | - Heng Zheng
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, China.
| | - Yi-Xuan Liu
- Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa, China.
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Li Y, Wang J, Sun T, Yu X, Yang Z, Zhao Y, Tang X, Xiao H. Community structure of endophytic bacteria of Sargassum thubergii in the intertidal zone of Qingdao in China. AMB Express 2024; 14:35. [PMID: 38615116 PMCID: PMC11016019 DOI: 10.1186/s13568-024-01688-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 03/12/2024] [Indexed: 04/15/2024] Open
Abstract
Endophytic bacteria are one of the symbiotic microbial groups closely related to host algae. However, less research on the endophytic bacteria of marine algae. In this study, the endophytic bacterial community of Sargassum thunbergii was investigated using the culture method and high-throughput sequencing. Thirty-nine endophytic bacterial strains, belonging to two phyla, five genera and sixteen species, were isolated, and Firmicutes, Bacillus and Metabacillus indicus were the dominant taxa at the phylum, genus and species level, respectively. High-throughput sequencing revealed 39 phyla and 574 genera of endophytic bacteria, and the dominant phylum was Proteobacteria, while the dominant genus was Ralstonia. The results also indicated that the endophytic bacteria of S. thunbergii included various groups with nitrogen fixation, salt tolerance, pollutant degradation, and antibacterial properties but also contained some pathogenic bacteria. Additionally, the endophytic bacterial community shared a large number of groups with the epiphytic bacteria and bacteria in the surrounding seawater, but the three groups of samples could be clustered separately. In conclusion, there are a variety of functional endophytic bacteria living in S. thunbergii, and the internal condition of algae is a selective factor for the formation of endophytic bacterial communities. This study enriched the database of endophytic bacteria in marine macroalgae, paving the way for further understanding of the interrelationships between endophytic bacteria, macroalgae, and the environment.
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Affiliation(s)
- Yang Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Jing Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Tao Sun
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Xinlong Yu
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Zhibo Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Yayun Zhao
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China
| | - Xuexi Tang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China.
- Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, 266000, China.
| | - Hui Xiao
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, China.
- Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, 266000, China.
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Zhou XY, Ban YL, Wang CB, Chen XT, Yang HW, Feng YJ. Characterization of three novel stem rot pathogens and their antagonistic endophytic bacteria associated with Cistanche deserticola. Arch Microbiol 2024; 206:208. [PMID: 38587620 DOI: 10.1007/s00203-024-03946-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/24/2024] [Accepted: 03/27/2024] [Indexed: 04/09/2024]
Abstract
Cistanche deserticola is a precious Chinese medicinal material with extremely high health care and medicinal value. In recent years, the frequent occurrence of stem rot has led to reduced or even no harvests of C. deserticola. The unstandardized use of farm chemicals in the prevention and control processes has resulted in excessive chemical residues, threatening the fragile desert ecological environment. Therefore, it is urgent to explore safe and efficient prevention and control technologies. Biocontrol agents, with the advantages of safety and environment-friendliness, would be an important idea. The isolation, screening and identification of pathogens and antagonistic endophytic bacteria are always the primary basis. In this study, three novel pathogens causing C. deserticola stem rot were isolated, identified and pathogenicity tested, namely Fusarium solani CPF1, F. proliferatum CPF2, and F. oxysporum CPF3. For the first time, the endophytic bacteria in C. deserticola were isolated and identified, of which 37 strains were obtained. Through dual culture assay, evaluation experiment and tissue culture verification, a biocontrol candidate strain Bacillus atrophaeus CE6 with outstanding control effect on the stem rot was screened out. In the tissue culture system, CE6 showed excellent control effect against F. solani and F. oxysporum, with the control efficacies reaching 97.2% and 95.8%, respectively, indicating its great potential for application in the production. This study is of great significance for the biocontrol of plant stem rot and improvement of the yield and quality of C. deserticola.
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Affiliation(s)
- Xin-Yi Zhou
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Ya-Li Ban
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Cheng-Bin Wang
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Xin-Tao Chen
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Hong-Wang Yang
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Yong-Jun Feng
- School of Life Science, Beijing Institute of Technology, Beijing, China.
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, Guangdong, China.
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Santos LRC, Barros PSDR, Monteiro DA, Tabosa JN, de Melo AF, de Lyra MDCCP, Oliveira JRDS, Fernandes Júnior PI, de Freitas ADS, Rachid CTCDC. Influences of plant organ, genotype, and cultivation site on the endophytic bacteriome of maize (Zea mays L.) in the semi-arid region of Pernambuco, Brazil. Braz J Microbiol 2024; 55:789-797. [PMID: 38146049 PMCID: PMC10920498 DOI: 10.1007/s42770-023-01221-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 12/16/2023] [Indexed: 12/27/2023] Open
Abstract
Endophytic bacteria play a crucial role in plant development and adaptation, and the knowledge of how endophytic bacteria assemblage is influenced by cultivation site and plant genotype is an important step to achieve microbiome manipulation. This work aimed to study the roots and stems of endophytic bacteriome of four maize genotypes cultivated in two regions of the semi-arid region of Pernambuco - Brazil. Our hypothesis is that the endophytic community assemblage will be influenced by plant genotypes and cultivation region. Metabarcoding sequencing data revealed significant differences in alfa diversity in function of both factors, genotypes, and maize organs. Beta diversity analysis showed that the bacterial communities differ mainly in function of the plant organ. The most abundant genera found in the samples were Leifsonia, Bacillus, Klebsiella, Streptomyces, and Bradyrhizobium. To understand ecological interactions within each compartment, we constructed co-occurrence network for each organ. This analysis revealed important differences in network structure and complexity and suggested that Leifsonia (the main genera found) had distinct ecological roles depending on the plant organ. Our data showed that root endophytic maize bacteria would be influenced by cultivation site, but not by genotype. We believe that, collectively, our data not only characterize the bacteriome associated with this plant and how different factors shape it, but also increase the knowledge to select potential bacteria for bioinoculant production.
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Affiliation(s)
- Leandro Reis Costa Santos
- Departamento de Agronomia, UFRPE - Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52061060, Brazil
| | - Pedro Sodré do Rêgo Barros
- Laboratory of Biotechnology and Microbial Ecology (LABEM), Universidade Federal do Rio de Janeiro, Instituto de Microbiologia Paulo de Góes, Av. Carlos Chagas Filho, Rio de Janeiro, 373, Brazil
| | - Douglas Alfradique Monteiro
- Laboratory of Biotechnology and Microbial Ecology (LABEM), Universidade Federal do Rio de Janeiro, Instituto de Microbiologia Paulo de Góes, Av. Carlos Chagas Filho, Rio de Janeiro, 373, Brazil
| | - José Nildo Tabosa
- Laboratory of Genomic, Instituto Agronômico de Pernambuco (IPA), Av. Gen. San Martin 1371, bl D, Pernambuco Agronomic Institute, Recife, Pernambuco, Brazil
| | - Aline Fernandes de Melo
- Departamento de Agronomia, UFRPE - Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52061060, Brazil
| | - Maria do Carmo Catanho Pereira de Lyra
- Laboratory of Genomic, Instituto Agronômico de Pernambuco (IPA), Av. Gen. San Martin 1371, bl D, Pernambuco Agronomic Institute, Recife, Pernambuco, Brazil
| | - Jéssica Rafaella de Sousa Oliveira
- Departamento de Agronomia, UFRPE - Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52061060, Brazil
| | | | - Ana Dolores Santiago de Freitas
- Departamento de Agronomia, UFRPE - Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52061060, Brazil
| | - Caio Tavora Coelho da Costa Rachid
- Laboratory of Biotechnology and Microbial Ecology (LABEM), Universidade Federal do Rio de Janeiro, Instituto de Microbiologia Paulo de Góes, Av. Carlos Chagas Filho, Rio de Janeiro, 373, Brazil.
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Liang X, Wan D, Tan L, Liu H. Dynamic changes of endophytic bacteria in the bark and leaves of medicinal plant Eucommia ulmoides in different seasons. Microbiol Res 2024; 280:127567. [PMID: 38103467 DOI: 10.1016/j.micres.2023.127567] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 11/28/2023] [Accepted: 12/04/2023] [Indexed: 12/19/2023]
Abstract
The bark and leaves of the Eucommia ulmoides Oliv. (E. ulmoides) have good medicinal value. Studies show endophytes play important roles in host medicinal plant secondary metabolite synthesis, with season being a key influencing factor. Therefore, we used 16 S rRNA to detect endophytic bacteria (EB) in E. ulmoides bark and leaves collected in winter, spring, summer, and autumn, and analyzed the contents of major active components respectively. The results showed that the species diversity and richness of EB of the E. ulmoides bark were higher than those of leaves in all seasons except fall. Among them, the higher species diversity and richness were found in the E. ulmoides bark in winter and spring. EB community structure differed significantly between medicinal tissues and seasons. Concurrently, the bark and leaves of E. ulmoides showed abundant characteristic EB across seasons. For active components, geniposidic acid showed a significant positive correlation with EB diversity and richness, while the opposite was true for aucubin. Additionally, some dominant EB exhibited close correlations with the accumulation of active components. Delftia, enriched in autumn, correlated significantly positively with aucubin. Notably, the impact of the same EB genera on active components differed across medicinal tissues. For example, Sphingomonas, enriched in summer, correlated significantly positively with pinoresinol diglucoside (PDG) in the bark, but with aucubin in the leaves. In summary, EB of E. ulmoides was demonstrated high seasonal dynamics and tissue specificity, with seasonal characteristic EB like Delftia and Sphingomonas correlating with the accumulation of active components in medicinal tissues.
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Affiliation(s)
- Xuejuan Liang
- Institute of Innovative Traditional Chinese Medications, Hunan Academy of Chinese Medicine, Changsha 410013, China
| | - Dan Wan
- Institute of Innovative Traditional Chinese Medications, Hunan Academy of Chinese Medicine, Changsha 410013, China
| | - Lei Tan
- Cili Meteorological Bureau, Zhangjiajie 410013, China
| | - Hao Liu
- Institute of Traditional Chinese Medicine Resources, Hunan Academy of Chinese Medicine, Changsha 410013, China.
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Serrão CP, Ortega JCG, Rodrigues PC, de Souza CRB. Bacillus species as tools for biocontrol of plant diseases: A meta-analysis of twenty-two years of research, 2000-2021. World J Microbiol Biotechnol 2024; 40:110. [PMID: 38411743 DOI: 10.1007/s11274-024-03935-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 02/21/2024] [Indexed: 02/28/2024]
Abstract
The traditional way of dealing with plant diseases has been the use of chemical products, but these harm the environment and are incompatible with the global effort for sustainable development. The use of Bacillus and related species in the biological control of plant diseases is a trend in green agriculture. Many studies report the positive effect of these bacteria, but a synthesis is still necessary. So, the objective of this work is to perform a meta-analysis of Bacillus biocontrol potential and identify factors that drive its efficacy. Data were compiled from articles published in journals listed in two of the main scientific databases between 2000 and 2021. Among 6159 articles retrieved, 399 research papers met the inclusion criteria for a systematic review. Overall, Bacilli biocontrol agents reduced disease by 60% compared to control groups. Furthermore, experimental tests with higher concentrations show a strong protective effect, unlike low and single concentration essays. Biocontrol efficacy also increased when used as a protective inoculation rather than therapeutic inoculation. Inoculation directly in the fruit has a greater effect than soil drenching. The size of the effect of Bacillus-based commercial products is lower than the newly tested strains. The findings presented in this study confirm the power of Bacillus-based bioinoculants and provide valuable guidance for practitioners, researchers, and policymakers seeking effective and sustainable solutions in plant disease management.
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Affiliation(s)
- Cleyson Pantoja Serrão
- Instituto de Ciências Biológicas, Universidade Federal do Pará (UFPA), Belém, CEP 66075-110, PA, Brazil
- Programa de Pós-Graduação em Genética e Biologia Molecular, UFPA, Belém, CEP 66075-110, PA, Brazil
| | | | - Paulo Canas Rodrigues
- Departamento de Estatística, Universidade Federal da Bahia (UFBA), Salvador, CEP 40170-110, BA, Brazil
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Wang Y, Xue D, Chen X, Qiu Q, Chen H. Structure and Functions of Endophytic Bacterial Communities Associated with Sphagnum Mosses and Their Drivers in Two Different Nutrient Types of Peatlands. Microb Ecol 2024; 87:47. [PMID: 38407642 PMCID: PMC10896819 DOI: 10.1007/s00248-024-02355-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 01/29/2024] [Indexed: 02/27/2024]
Abstract
Sphagnum mosses are keystone plant species in the peatland ecosystems that play a crucial role in the formation of peat, which shelters a broad diversity of endophytic bacteria with important ecological functions. In particular, methanotrophic and nitrogen-fixing endophytic bacteria benefit Sphagnum moss hosts by providing both carbon and nitrogen. However, the composition and abundance of endophytic bacteria from different species of Sphagnum moss in peatlands of different nutrient statuses and their drivers remain unclear. This study used 16S rRNA gene amplicon sequencing to examine endophytic bacterial communities in Sphagnum mosses and measured the activity of methanotrophic microbial by the 13C-CH4 oxidation rate. According to the results, the endophytic bacterial community structure varied among Sphagnum moss species and Sphagnum capillifolium had the highest endophytic bacterial alpha diversity. Moreover, chlorophyll, phenol oxidase, carbon contents, and water retention capacity strongly shaped the communities of endophytic bacteria. Finally, Sphagnum palustre in Hani (SP) had a higher methane oxidation rate than S. palustre in Taishanmiao. This result is associated with the higher average relative abundance of Methyloferula an obligate methanotroph in SP. In summary, this work highlights the effects of Sphagnum moss characteristics on the endophytic bacteriome. The endophytic bacteriome is important for Sphagnum moss productivity, as well as for carbon and nitrogen cycles in Sphagnum moss peatlands.
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Affiliation(s)
- Yue Wang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, Chengdu, 610041, China
- Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, 624400, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Dan Xue
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, Chengdu, 610041, China.
- Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, 624400, China.
| | - Xuhui Chen
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, Chengdu, 610041, China
- Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, 624400, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qing Qiu
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, Chengdu, 610041, China
| | - Huai Chen
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, South Renmin Road, Chengdu, 610041, China.
- Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, 624400, China.
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Hao B, Wu H, Zhang S, He B. Response strategies of stem/leaves endophyte communities to nano-plastics regulate growth performance of submerged macrophytes. J Hazard Mater 2024; 464:132883. [PMID: 37952333 DOI: 10.1016/j.jhazmat.2023.132883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 11/14/2023]
Abstract
Research on the toxicity effects of nano-plastics on submerged macrophytes has been increasing over the past several years. However, how the endophytic bacteria of submerged macrophytes respond to nano-plastics remains unknown, although they have been widely shown to help terrestrial plants cope with various environmental stressors. Here, a microcosm experiment was performed to unravel the effects of high concentration of nano-plastics (20 mg/L) on three submerged macrophyte (Vallisneria natans, Potamogeton maackianus, Myriophyllum spicatum) and their endophytic bacterial communities. Results indicated that nano-plastics induced antioxidative stress in plants, but significantly reduction in relative growth rate (RGR) only occurred in V. natans (from 0.0034 to -0.0029 day-1), accompanied by change in the stem/leaves endophyte community composition. Further analysis suggested nano-plastics caused a reduction in environmental nutrient availability and the proportion of positive interactions between endophyte communities (43%), resulting in the lowest RGR of V. natans. In contrast, endophytes may help P. maackianus and M. spicatum cope with nano-plastic stress by increasing the proportion of positive correlations among communities (70% and 75%), leaving their RGR unaffected. Collectively, our study elucidates the species-specific response strategies of submerged macrophyte-endophyte to nano-plastics, which helps to reveal the different phytoremediation potential of submerged macrophytes against nano-plastic pollution.
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Affiliation(s)
- Beibei Hao
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
| | - Haoping Wu
- Guangdong Key Laboratory of Ornamental Plant Germplasm Innovation and Utilization, Environmental Horticulture Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.
| | - Siyi Zhang
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
| | - Bin He
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China.
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11
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Etminani F, Harighi B, Bahramnejad B, Mozafari AA. Antivirulence effects of cell-free culture supernatant of endophytic bacteria against grapevine crown gall agent, Agrobacterium tumefaciens, and induction of defense responses in plantlets via intact bacterial cells. BMC Plant Biol 2024; 24:104. [PMID: 38336608 DOI: 10.1186/s12870-024-04779-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Accepted: 01/29/2024] [Indexed: 02/12/2024]
Abstract
BACKGROUND Crown gall disease caused by Agrobacterium tumefaciens is a very destructive affliction that affects grapevines. Endophytic bacteria have been discovered to control plant diseases via the use of several mechanisms. This research examined the potential for controlling crown gall by three endophytic bacteria that were previously isolated from healthy cultivated and wild grapevines including Pseudomonas kilonensis Ba35, Pseudomonas chlororaphis Ba47, and Serratia liquefaciens Ou55. RESULT At various degrees, three endophytic bacteria suppressed the populations of A. tumefaciens Gh1 and greatly decreased the symptoms of crown gall. Furthermore, biofilm production and motility behaviors of A. tumefaciens Gh1were greatly inhibited by the Cell-free Culture Supernatant (CFCS) of endophytic bacteria. According to our findings, CFCS may reduce the adhesion of A. tumefaciens Gh1 cells to grapevine cv. Rashe root tissues as well as their chemotaxis motility toward the extract of the roots. When compared to the untreated control, statistical analysis showed that CFCS significantly reduced the swimming, twitching, and swarming motility of A. tumefaciens Gh1. The findings demonstrated that the endophytic bacteria effectively stimulated the production of plant defensive enzymes including superoxide dismutase (SOD), polyphenol oxidase (PPO), peroxidase (POD), phenylalanine ammonia lyase (PAL), and total soluble phenols at different time intervals in grapevine inoculated with A. tumefaciens Gh1. The Ba47 strain markedly increased the expression levels of defense genes associated with plant resistance. The up-regulation of PR1, PR2, VvACO1, and GAD1 genes in grapevine leaves indicates the activation of SA and JA pathways, which play a role in enhancing resistance to pathogen invasion. The results showed that treating grapevine with Ba47 increased antioxidant defense activities and defense-related gene expression, which reduced oxidative damage caused by A. tumefaciens and decreased the incidence of crown gall disease. CONCLUSION This is the first study on how A. tumefaciens, the grapevine crown gall agent, is affected by CFCS generated by endophytic bacteria in terms of growth and virulence features. To create safer plant disease management techniques, knowledge of the biocontrol processes mediated by CFCS during microbial interactions is crucial.
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Affiliation(s)
- Faegheh Etminani
- Department of Plant Protection, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran
| | - Behrouz Harighi
- Department of Plant Protection, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran.
| | - Bahman Bahramnejad
- Department of Plant Production and Genetics, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran
| | - Ali Akbar Mozafari
- Department of Horticultural Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran
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12
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Tran DM, Nguyen TH. Endophytic bacterial dataset of the Cavendish banana grown in Dak Lak Province of Vietnam using 16S rRNA gene metabarcoding. Data Brief 2024; 52:109863. [PMID: 38111857 PMCID: PMC10726212 DOI: 10.1016/j.dib.2023.109863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 11/15/2023] [Accepted: 11/22/2023] [Indexed: 12/20/2023] Open
Abstract
The Cavendish banana (Musa cavendishii L.) is one of the main perennial crops grown in Dak Lak Province of Vietnam. However, data on the endophytic bacterial community of this plant are unknown. In this work, a representative sample, mixing from 5 root samples collected from five banana gardens (the Dwarf Cavendish cultivar) in Dak Lak, was used for analyzing the endophytic microbiome using 16S rRNA gene metabarcoding. Results showed that 5 phyla, 7 classes, 20 orders, 31 families, and 47 genera of endophytic bacteria were identified from the sample. Bacteria belonging to phylum Proteobacteria were the most predominant, with 72.64%, and functions involved in biosynthesis were the most abundant, with 75.35%, of the endophytic bacterial community. Data help to understand the endophytic bacterial community of the Cavendish banana cultivated in Dak Lak, Vietnam. These data can be useful for further experiments concerning relationships between the growth of the Cavendish banana and endophytic bacteria. This is the first report on the endophytic bacteria of the Cavendish banana cultivated in Dak Lak, Vietnam.
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Affiliation(s)
- Dinh Minh Tran
- Institute of Biotechnology and Environment, Tay Nguyen University, Buon Ma Thuot, Dak Lak 630000, Vietnam
| | - Thi Huyen Nguyen
- Institute of Biotechnology and Environment, Tay Nguyen University, Buon Ma Thuot, Dak Lak 630000, Vietnam
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13
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Liu J, Wang Z, Zhao C, Lu B, Zhao Y. Phytohormone gibberellins treatment enhances multiple antibiotics removal efficiency of different bacteria-microalgae-fungi symbionts. Bioresour Technol 2024; 394:130182. [PMID: 38081467 DOI: 10.1016/j.biortech.2023.130182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/06/2023] [Accepted: 12/06/2023] [Indexed: 02/04/2024]
Abstract
To develop and characterize novel antibiotics removal biomaterial technology, we constructed three different bacteria-microalgae-fungi consortiums containing Chlorella vulgaris (C. vulgaris), endophytic bacterium, Clonostachys rosea (C. rosea), Ganoderma lucidum, and Pleurotus pulmonarius. The results showed that under treatment with 50 mg/L of gibberellins (GAs), the three bacteria-microalgae-fungi symbionts had maximal growth rates (0.317 ± 0.030 d-1) and the highest removal efficiency for seven different antibiotics. Among them, C. vulgaris-endophytic bacterium-C. rosea symbiont had the best performance, with antibiotics removal efficiencies of 96.0 ± 1.4 %, 91.1 ± 7.9 %, 48.7 ± 5.1 %, 34.6 ± 2.9 %, 61.0 ± 5.5 %, 63.7 ± 5.6 %, and 54.3 ± 4.9 % for tetracycline hydrochloride, oxytetracycline hydrochloride, ciprofloxacin, norfloxacin, sulfadiazine, sulfamethazine, and sulfamethoxazole, respectively. Overall, the present study demonstrates that 50 mg/L GAs enhances biomass production and antibiotics removal efficiency of bacteria-microalgae-fungi symbionts, providing a framework for future antibiotics-containing wastewater treatment using three-phase symbionts.
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Affiliation(s)
- Jun Liu
- School of Basic Medical Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Zhengfang Wang
- Suzhou Institute of Trade & Commerce, Suzhou 215009, China
| | - Chunzhi Zhao
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201400, China
| | - Bei Lu
- School of Ecological Technology & Engineering, Shanghai Institute of Technology, Shanghai 201400, China
| | - Yongjun Zhao
- School of Engineering, Hangzhou Normal University, Hangzhou 311121, China.
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14
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Kandasamy GD, Kathirvel P. Production, characterization and in vitro biological activities of crude pigment from endophytic Micrococcus luteus associated with Avicennia marina. Arch Microbiol 2023; 206:26. [PMID: 38108901 DOI: 10.1007/s00203-023-03751-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/15/2023] [Accepted: 11/16/2023] [Indexed: 12/19/2023]
Abstract
Due to their non-toxic and non-carcinogenic nature, biopigments have a phenomenal benefit over synthetic pigments, making them a desirable source for human utilization and a potential alternative to traditional synthetic pigments that are hazardous to the environment and public health. Endosymbiotic interactions between mangrove plants and bacteria could provide an alternate source for the synthesis of unique compounds with potent biomedical applications. Pigmented endophytic bacteria were screened from the explants of Avicennia marina, a mangrove plant, and identified as Micrococcus luteus by molecular characterization. The intracellular pigment was successfully extracted using the sonication-assisted solvent extraction method, and screening factors impacting the pigmentation bioprocess were determined using a one-factor-at-a-time approach. The endophyte produced yellow pigment in the liquid medium, with the maximum growth and pigment production recorded in nutrient broth at 37 ℃ and pH 7 after 96 h of incubation, while the maximum accumulation of pigment was observed in the media supplemented with glucose and tryptone as carbon and nitrogen sources, respectively. The extracted crude pigment was further characterized by ultraviolet, followed by Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. The obtained crude pigment has been evaluated for its antioxidant and anticancer activity by various assays, such as DPPH radical scavenging activity, FRAP assay, superoxide anion and nitric oxide radical scavenging, metal chelating activity, phosphomolybdenum assay, and MTT assay, respectively, at varying concentrations. The results of our study revealed that the yellow pigment produced by the endophyte showed significant dose-dependent antioxidant and anticancer activity.
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Affiliation(s)
| | - Preethi Kathirvel
- Department of Microbial Biotechnology, Bharathiar University, Coimbatore, Tamil Nadu, India.
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15
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Mangun VV, Sugumaran R, Lym Yong WT, Yusof NA. Dataset of 16S ribosomal DNA sequence-based identification of endophytic bacteria isolated from healthy and diseased Sabah red algae, Kappaphycus alvarezii. Data Brief 2023; 51:109785. [PMID: 38053588 PMCID: PMC10694040 DOI: 10.1016/j.dib.2023.109785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 08/25/2023] [Accepted: 11/02/2023] [Indexed: 12/07/2023] Open
Abstract
Bacterial endophytes play a vital role in the growth and fitness of host plants from infection by phytopathogens. To our knowledge, however, little information is available on the endophytic bacterial composition in healthy and diseased Kappahycus alvarezii, one of the most important major sources of carrageenan industries, especially in Sabah. The main idea was to analyze and compare the composition of endophytic bacterial communities in healthy and diseased K. alvarezii isolated from Sabah, Malaysia. The data reveals the composition of endophytic bacterial microbiomes in healthy and diseased K. alvarezii isolated from Sabah. The isolated endophytes were identified using 16S rDNA sequencing. Taxonomic identification and phylogenetic tree analysis were done using the online BLAST (blastn) and MEGA11 software, respectively. The data presents the diversity of bacterial endosphere microbiomes found in healthy K. alvarezii which are composed of Bacillus, Cytobacillus and Priestia whereas Vibrio and Micrococcus occurred exclusively in the diseased K. alvarezii. Microbial comparative analysis between the healthy and diseased seaweed points to the potential of several Bacillus strains that may have biocontrol potential against Vibrio infection in seaweed such as the ice-ice disease. Raw data files are available at the GenBank, NCBI database under the accession number MZ570560 to MZ570580.
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Affiliation(s)
- Vernon Vest Mangun
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah 88400, Malaysia
| | - Rajeena Sugumaran
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah 88400, Malaysia
| | - Wilson Thau Lym Yong
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah 88400, Malaysia
| | - Nur Athirah Yusof
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah 88400, Malaysia
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16
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Wang X, Wang L, You Y, Yang D, Cao Y, Wang Y, Ma F. Differential interference of copper with endophytic bacterial inoculation: Atrazine decontamination in Acorus tatarinowii and culture solution. Environ Pollut 2023; 337:122523. [PMID: 37683758 DOI: 10.1016/j.envpol.2023.122523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 08/04/2023] [Accepted: 09/05/2023] [Indexed: 09/10/2023]
Abstract
To clarify the interference effects of inorganic ions, Acorus tatarinowii and endophytic bacterium Herbaspirillum huttiense (Hh) were combined to decontaminate atrazine pollution under different copper levels. This study verified inoculation effects and revealed the complicated processes of atrazine transformation in solutions. 35.9% leaf biomass was promoted by Hh inoculation, and the value was lowered to 7.87% by high doses of copper. The changing trend of leaf N, K, and S contents, and tiller numbers were consistent with that of leaf biomass. Hh injection improved atrazine accumulation by 43.5% in roots, and under copper interference, this value lowered to 10.6%. Hh promoted atrazine deethylation in plants, which was copper-dose dependent in different plant organs. In solutions, atrazine was conjugated with small-molecule secretions at m/z 118, detoxicated into 2-hxydroatrazine and 2-hydroxy-4-acetamido-atrazine, then the triazine ring opened. Copper interference had a more significant impact on residual atrazine conversion products than Hh inoculation treatments. Hh treatment promoted the ring-opening degradation of atrazine in water. The addition of high doses of copper ions promoted the oxidative process of atrazine while inhibiting its ring-opening transformation process in water.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Li Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China.
| | - Yongqiang You
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Dongguang Yang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Yuqing Cao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Yujiao Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, China
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17
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Taniguchi T, Isobe K, Imada S, Eltayeb MM, Akaji Y, Nakayama M, Allen MF, Aronson EL. Root endophytic bacterial and fungal communities in a natural hot desert are differentially regulated in dry and wet seasons by stochastic processes and functional traits. Sci Total Environ 2023; 899:165524. [PMID: 37467971 DOI: 10.1016/j.scitotenv.2023.165524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 07/10/2023] [Accepted: 07/11/2023] [Indexed: 07/21/2023]
Abstract
Dryland ecosystems experience seasonal cycles of severe drought and moderate precipitation. Desert plants may develop symbiotic relationships with root endophytic microbes to survive under the repeated wet and extremely dry conditions. Although community coalescence has been found in many systems, the colonization by functional microbes and its relationship to seasonal transitions in arid regions are not well understood. Here we examined root endophytic microbial taxa, and their traits in relation to their root colonization, during the dry and wet seasons in a hot desert of the southwestern United States. We used high-throughput DNA sequencing of 16S rRNA and internal transcribed spacer gene profiling of five desert shrubs, and analyzed the seasonal change in endophytic microbial lineages. Goodness of fit to the neutral community model in relationship to microbial traits was evaluated. In summer, Actinobacteria and Bacteroidia increased, although this was not genus-specific. For fungi, Glomeraceae selectively increased in summer. In winter, Gram-negative bacterial genera, including those capable of nitrogen fixation and plant growth promotion, increased. Neutral model analysis revealed a strong stochastic influence on endophytic bacteria but a weak effect for fungi, especially in summer. The taxa with higher frequency than that predicted by neutral model shared environmental adaptability and symbiotic traits, whereas the frequency of pathogenic fungi was at or under the predicted value. These results suggest that community assembly of bacteria and fungi is regulated differently. The bacterial community was affected by stochastic and deterministic processes via bacterial response to drought (response trait), beneficial effect on plants (effect trait), and likely stable mutualistic interactions with plants suggested by the frequency of nodule bacteria. For fungi, mycorrhizal fungi were selected by plants in summer. The regulation of beneficial microbes by plants in both dry and wet seasons suggests the presence of plant-soil positive feedback in this natural desert ecosystem.
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Affiliation(s)
- Takeshi Taniguchi
- Arid Land Research Center, Tottori University, Tottori 680-0001, Japan.
| | - Kazuo Isobe
- Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Shogo Imada
- Department of Radioecology, Institute for Environmental Sciences, Aomori 039-3212, Japan
| | - Mohamed M Eltayeb
- Arid Land Research Center, Tottori University, Tottori 680-0001, Japan; Department of Food Science and Technology, Faculty of Agriculture, University of Khartoum, Shambat 13314, Sudan
| | - Yasuaki Akaji
- Biodiversity Division, National Institute for Environmental Studies, Ibaraki 305-8506, Japan
| | - Masataka Nakayama
- Research Group for Environmental Science, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
| | - Michael F Allen
- Department of Microbiology and Plant Pathology, University of California, Riverside, CA 92521, USA
| | - Emma L Aronson
- Department of Microbiology and Plant Pathology, University of California, Riverside, CA 92521, USA
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18
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Wang Z, Li N, Wang W, Zhu Y, Liu Y. Endophytic bacterial community diversity in genetically related hybrid rice seeds. Appl Microbiol Biotechnol 2023; 107:6911-6922. [PMID: 37704771 DOI: 10.1007/s00253-023-12782-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 09/04/2023] [Accepted: 09/07/2023] [Indexed: 09/15/2023]
Abstract
The Food and Agriculture Organization of the United Nations (FAO) has identified hybrid rice as ideal for addressing food scarcity in poor nations. A comprehensive investigation of the endophytic bacteria in hybrid rice seeds is essential from a microecological perspective to illuminate the mechanisms underlying its high yield, high quality, and multi-resistance. The endophytic bacterial diversity and community structures of 11 genetically correlated hybrid rice seeds with different rice blast resistance levels were studied using high-throughput sequencing (HTS) on the Illumina MiSeq platform to reveal their "core microbiota" and explore the effect of genotypes, genetic relationships, and resistance. Proteobacteria (78.15-99.15%) represented the most abundant group in the 11 hybrid rice cultivars, while Pantoea, Pseudomonas, and Microbacterium comprised the "core microbiota." Hybrid rice seeds with different genotypes, genetic correlations, and rice blast resistance displayed endophytic bacterial community structure and diversity variation. In addition, the network relationships between the rice seed endophytic bacteria of "the same female parent but different male parents" were more complex than those from "the same male parent but different female parents." Matrilineal inheritance may be the primary method of passing on endophytic bacteria in rice from generation to generation. The endophytic bacterial interaction network in rice blast-resistant hybrid rice seed varieties was more complicated than in susceptible varieties. In summary, this study demonstrated that the genotype, genetic relationship, and rice blast resistance were important factors affecting the community structures and diversity of endophytic bacteria in hybrid rice seeds, which was vital for revealing the interaction between endophytic bacteria and the host. KEY POINTS: • Pantoea, Pseudomonas, and Microbacterium represent the main endophytic bacteria in hybrid rice seeds. • Genotype is the primary factor affecting endophytic bacterial diversity in hybrid rice seeds. • The diversity of the endophytic bacterial community in hybrid rice seeds is related to their genotypes, genetic relationships, and rice blast resistance.
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Affiliation(s)
- Zhishan Wang
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Ni Li
- State Key Laboratory of Hybrid Rice (Hunan Hybrid Rice Research Center), Changsha, 410125, China
| | - Weiping Wang
- State Key Laboratory of Hybrid Rice (Hunan Hybrid Rice Research Center), Changsha, 410125, China.
| | - Yongqiang Zhu
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai (CHGC) and Shanghai Institute for Biomedical and Pharmaceutical Technologies, Shanghai, 201203, China.
| | - Yang Liu
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
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19
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Wang Z, Zhao C, Lu B, Zhang H, Zhao Y. Attenuation of antibiotics from simulated swine wastewater using different microalgae-based systems. Bioresour Technol 2023; 388:129796. [PMID: 37742816 DOI: 10.1016/j.biortech.2023.129796] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 09/19/2023] [Accepted: 09/19/2023] [Indexed: 09/26/2023]
Abstract
Antibiotic misuse are potentially harmful to the environment and human health. Four algal symbionts were constructed using Chlorella vulgaris, endophytic bacterium and Clonostachys rosea (C. rosea) as the biomaterials. The growth, photosynthetic activity, and antibiotic removal efficiency of symbiont under different initial antibiotic concentrations was analyzed. The results showed that the microalgae-bacteria-fungi symbiont had a maximum growth rate of 0.307 ± 0.030 d-1 and achieved 99.35 ± 0.47%, 81.06 ± 7.83%, and 79.15 ± 7.26% removal of oxytetracycline (OTC), sulfadimethazine (SM2), and ciprofloxacin hydrochloride (CPFX), respectively, at an initial antibiotic concentration of 0.25 mg/L. C. rosea has always existed as a biocontrol fungus. In this study, it was innovatively used to construct algal symbionts and used for antibiotic wastewater treatment with a high efficiency. The results contribute to the development of appropriate bioaugmentation strategies and the design of an algal symbiont process for the treatment of antibiotic-containing wastewater.
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Affiliation(s)
- Zhengfang Wang
- Suzhou Institute of Trade & Commerce, Suzhou 215009, China
| | - Chunzhi Zhao
- School of engineering, Hangzhou Normal University, Hangzhou 311121, China; School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201400, China
| | - Bei Lu
- School of Ecological Technology & Engineering, Shanghai Institute of Technology, Shanghai 201400, China
| | - Hui Zhang
- College of data Science, Jiaxing University, Jiaxing 314001, China
| | - Yongjun Zhao
- School of engineering, Hangzhou Normal University, Hangzhou 311121, China.
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Woźniak M, Tyśkiewicz R, Siebielec S, Gałązka A, Jaroszuk-Ściseł J. Metabolic Profiling of Endophytic Bacteria in Relation to Their Potential Application as Components of Multi-Task Biopreparations. Microb Ecol 2023; 86:2527-2540. [PMID: 37392205 PMCID: PMC10640448 DOI: 10.1007/s00248-023-02260-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 06/21/2023] [Indexed: 07/03/2023]
Abstract
Agricultural crops are exposed to various abiotic and biotic stresses that can constrain crop productivity. Focusing on a limited subset of key groups of organisms has the potential to facilitate the monitoring of the functions of human-managed ecosystems. Endophytic bacteria can enhance plant stress resistance and can help plants to cope with the negative impacts of stress factors through the induction of different mechanisms, influencing plant biochemistry and physiology. In this study, we characterise endophytic bacteria isolated from different plants based on their metabolic activity and ability to synthesise 1-aminocyclopropane-1-carboxylic acid deaminase (ACCD), the activity of hydrolytic exoenzymes, the total phenolic compounds (TPC) and iron-complexing compounds (ICC). Test GEN III MicroPlate indicated that the evaluated endophytes are highly metabolically active, and the best used substrates were amino acids, which may be important in selecting potential carrier components for bacteria in biopreparations. The ACCD activity of strain ES2 (Stenotrophomonas maltophilia) was the highest, whereas that of strain ZR5 (Delftia acidovorans) was the lowest. Overall, the obtained results indicated that ∼91.3% of the isolates were capable of producing at least one of the four hydrolytic enzymes. In addition, most of the tested strains produced ICC and TPC, which play a significant role in reducing stress in plants. The results of this study suggest that the tested endophytic bacterial strains can potentially be used to mitigate climate change-associated stresses in plants and to inhibit plant pathogens.
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Affiliation(s)
- Małgorzata Woźniak
- Department of Agricultural Microbiology, Institute of Soil Science and Plant Cultivation-State Research Institute, Czartoryskich 8, 24-100, Pulawy, Poland.
| | - Renata Tyśkiewicz
- Analytical Laboratory, Łukasiewicz Research Network-New Chemical Syntheses Institute, Al. Tysiąclecia Państwa Polskiego 13a, 24-110, Pulawy, Poland
| | - Sylwia Siebielec
- Department of Agricultural Microbiology, Institute of Soil Science and Plant Cultivation-State Research Institute, Czartoryskich 8, 24-100, Pulawy, Poland
| | - Anna Gałązka
- Department of Agricultural Microbiology, Institute of Soil Science and Plant Cultivation-State Research Institute, Czartoryskich 8, 24-100, Pulawy, Poland
| | - Jolanta Jaroszuk-Ściseł
- Department of Industrial and Environmental Microbiology, Faculty of Biology and Biotechnology, Maria Curie-Skłodowska University, Akademicka 19, 20-033, Lublin, Poland
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Kiros T, Ebu SM, Melaku Y, Tesfa T, Dekebo A. Isolation and identification of endophytic bacteria and associated compound from Gloriosa superba and their antibacterial activities. Heliyon 2023; 9:e22104. [PMID: 38045151 PMCID: PMC10692777 DOI: 10.1016/j.heliyon.2023.e22104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 09/05/2023] [Accepted: 11/04/2023] [Indexed: 12/05/2023] Open
Abstract
Gloriosa superba L., which belongs to the genus Gloriosa and family Colchicaceae, is a climbing annual herb and tuberous poisonous tropical medicinal plant. This study was aimed to isolate possible endophytic bacteria from leaves, stems and tubers of Gloriosa superba. Thirty pure endophytic bacteria were isolated and subjected to biochemical characterization. Bacterial identification was conducted by Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The structure of the isolated compound was characterized. The antibacterial activity was also evaluated. Majority (21, 70 %) of the isolates were Gram-positive. Certain of them are spore formers. Based on MALDI-TOF MS, 26 of the isolates were identified as Bacillus spp. (65.4 %), Escherichia spp. (30.8 %) and Providencia spp. (3.9 %). A 1-undecene was isolated from culture filtrate of E. coli (GST-5). The ethyl acetate extracts (1000 μg/mL) of GSL-5 and GST-2 culture filtrates recorded maximum inhibition zone against E. coli (9.4 ± 0.6 mm) and S. aurous ATCC 25923T (8.4 ± 0.8 mm), respectively. The Pseudomonas aeruginosa ATCC 27853T was prone to all ethyl acetate extracts. A 1-undecene showed a moderate activity against E. coli ATCC 25922Tand P. aeruginosa ATCC 27853T at 50 μg/mL. The present finding would be a breakthrough to studies of similar works in Ethiopia since it may be for the first time.
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Affiliation(s)
- Tsegu Kiros
- Central Laboratory, Haramaya University, Dire Dawa, P.O.BOX 138, Ethiopia
- Department of Applied Chemistry, Adama Science and Technology University, Adama, P.O.BOX 1888, Ethiopia
| | - Seid Mohammed Ebu
- Department of Applied Biology, Adama Science and Technology University, Adama, P.O.BOX 1888, Ethiopia
| | - Yadessa Melaku
- Department of Applied Chemistry, Adama Science and Technology University, Adama, P.O.BOX 1888, Ethiopia
| | - Tewodros Tesfa
- School of Medical Laboratory Sciences, College of Health and Medical Sciences, Haramaya University, Dire Dawa, P.O.BOX 235, Ethiopia
| | - Aman Dekebo
- Department of Applied Chemistry, Adama Science and Technology University, Adama, P.O.BOX 1888, Ethiopia
- Institute of Pharmaceutical Sciences, Adama Science and Technology University, Adama, Ethiopia
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Qian X, Tang X, Tian W, Xiao X, Wang Y, Lv Q, Li H, Feng S. Climate factors and host chemical profiles jointly drives the bacterial community assembly in Mussaenda pubescens stems. Environ Res 2023; 235:116687. [PMID: 37467942 DOI: 10.1016/j.envres.2023.116687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/08/2023] [Accepted: 07/15/2023] [Indexed: 07/21/2023]
Abstract
Endophytic bacteria residing within host plants can significantly impact on the host's growth, health, and overall relationship with its surrounding environment. However, the process that shape the community assembly of stem bacterial endophytes (SBEs) remains poorly understood. This study explored the community structure, co-occurrence patterns, and ecological processes of the SBEs inhabiting the shrub host, Mussaenda pubescens, across seven locations in southeastern China. We found that the absolute abundances, alpha diversity, and community composition of SBE communities exhibited notable differences among various host populations. Stem chemical characteristics were the most important factors influencing SBE community distribution, followed by geographic distance and climatic factors. The beta diversity decomposition analyses indicated that SBE community dissimilarities between sites were nearly equally driven by similarity, replacement diversity, and richness difference. The co-occurrence network analysis revealed that the keystone taxa were mostly observed in rare species, which may be essential for preserving the ecosystem's functions. Conditionally abundant taxa (CAT) showcased the highest closeness centrality, while exhibiting the lowest degree centrality and betweenness centrality as opposed to rare taxa. In addition, stochastic processes also played an important role in structuring SBE communities, with ecological drift being the dominant factor for both abundant and rare taxa. This study would deepen our understanding of the ecological dynamics and microbial interactions within plant endophytic microbiomes.
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Affiliation(s)
- Xin Qian
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
| | - Xinghao Tang
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China; Fujian Academy of Forestry Sciences, Fuzhou, 350012, China
| | - Weiwei Tian
- Sichuan Academy of Chinese Medical Sciences, Chengdu, 610041, China
| | - Xiangxi Xiao
- Fujian Academy of Forestry Sciences, Fuzhou, 350012, China
| | - Yonglong Wang
- Faculty of Biological Science and Technology, Baotou Teacher's College, Baotou, 014030, China
| | - Qixin Lv
- Nanjing Agricultural University, Nanjing, 210095, China
| | - Hanzhou Li
- Wuhan Benagen Technology Company, Wuhan, 430000, China
| | - Song Feng
- College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China.
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Wang Y, Li P, Tian Y, Xiong Z, Zheng Z, Yi Z, Ao H, Wang Q, Li J. Bacterial seed endophyte and abiotic factors influence cadmium accumulation in rice (Oryza sativa) along the Yangtze River area. Ecotoxicol Environ Saf 2023; 263:115352. [PMID: 37579590 DOI: 10.1016/j.ecoenv.2023.115352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Revised: 08/03/2023] [Accepted: 08/08/2023] [Indexed: 08/16/2023]
Abstract
Cadmium (Cd) contamination in rice (Oryza sativa) is particularly problematic due to its high risk to human health. Investigating the hidden roles of seed endophytes of rice in influencing Cd accumulation is essential to comprehensively understand the effects of biotic and abiotic factors to food security. Here, the content of Cd in soils and rice (Huanghuazhan) seeds from 19 sites along the Yangtze River exhibited considerable differences. From a biotic perspective, we observed the dominant endophytic bacteria, Stenotrophomonas (7.25 %), contribute to Cd control of rice (below 0.2 mg kg-1). Partial Least Squares (PLS) analysis further suggested that Enterobacteriaceae (15.48 %), altitude and pH were found to be the strong variables that might reduce the Cd uptake of rice. In contrast, Cytophagaceae (0.58 %), latitude and mean annual air pressure had the opposite effect. In pot experiments, after respectively inoculating the isolated endophytic bacteria Stenotrophomonas T4 and Enterobacter R1, N1 (f_Enterobacteriaceae), the Cd contents in shoot decreased by 47.6 %, 21.9 % and 33.0 % compared to controls. The distribution of Cd resistant genes (e.g., czcABC, nccAB, cznA) of Stenotrophomonas, Enterobacteriaceaea and Cytophagaceae further suggested their distinct manners in influencing the Cd uptake of rice. Overall, this study provides new insights into the food security threatened by globally widespread Cd pollution.
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Affiliation(s)
- Yujie Wang
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Peng Li
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Yunhe Tian
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Ziqin Xiong
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Zhongyi Zheng
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Zhenxie Yi
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Hejun Ao
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Qiming Wang
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Juan Li
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China.
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Saucedo-Bazalar M, Masias P, Nouchi-Moromizato E, Santos C, Mialhe E, Cedeño V. MALDI mass spectrometry-based identification of antifungal molecules from endophytic Bacillus strains with biocontrol potential of Lasiodiplodia theobromae, a grapevine trunk pathogen in Peru. Curr Res Microb Sci 2023; 5:100201. [PMID: 37752899 PMCID: PMC10518354 DOI: 10.1016/j.crmicr.2023.100201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023] Open
Abstract
Lasiodiplodia theobromae, a grapevine trunk pathogen, is becoming a significant threat to vineyards worldwide. In Peru, it is responsible for Botryosphaeria dieback in many grapevine-growing areas and it has spread rapidly due to its high transmissibility; hence, control measures are urgent. It is known that some endophytic bacteria are strong inhibitors of phytopathogens because they produce a wide range of antimicrobial molecules. However, studies of antimicrobial features from endophytic bacteria are limited to traditional confrontation methods. In this study, a MALDI mass spectrometry-based approach was performed to identify and characterize the antifungal molecules from Bacillus velezensis M1 and Bacillus amyloliquefaciens M2 grapevine endophytic strains. Solid medium antagonism assays were performed confronting B. velezensis M1 - L. theobromae and B. amyloliquefaciens M2 - L. theobromae for antifungal lipopeptides identification. By a MALDI TOF MS it was possible identify mass spectra for fengycin, iturin and surfactin protoned isoforms. Masses spectrums for mycobacillin and mycosubtilin were also identified. Using MALDI Imaging MS we were able to visualize and relate lipopeptides mass spectra of fengycin (1463.9 m/z) and mycobacillin (1529.6 m/z) in the interaction zone during confrontations. The presence of lipopeptides-synthesis genes was confirmed by PCR. Liquid medium antagonism assays were performed for a proteomic analysis during the confrontation of B. velezensis M1 - L. theobromae. Different peptide sequences corresponding to many antifungal proteins and enzymes were identified by MALDI TOF MS/MS. Oxalate decarboxylase bacisubin and flagellin, reported as antifungal proteins, were identified at 99 % identity through peptide mapping. MALDI mass spectrometry-based identification of antifungal molecules would allow the early selection of endophytic bacteria with antifungal features. This omics tool could lead to measures for prevention of grapevine diseases and other economically important crops in Peru.
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Affiliation(s)
- Manuel Saucedo-Bazalar
- Departamento de Biología y Bioquímica, Universidad Nacional de Tumbes, Av. Universitaria s/n, Pampa Grande, Tumbes, Peru
- Programa de Maestría en Biotecnología Molecular, Escuela de Posgrado, Universidad Nacional de Tumbes, Av. Universitaria s/n, Pampa Grande, Tumbes, Peru
| | | | - Estefanía Nouchi-Moromizato
- Programa de Maestría en Biotecnología Molecular, Escuela de Posgrado, Universidad Nacional de Tumbes, Av. Universitaria s/n, Pampa Grande, Tumbes, Peru
| | | | - Eric Mialhe
- INCABIOTEC SAC, Jr. Filipinas 212, Tumbes, Peru
| | - Virna Cedeño
- INCABIOTEC SAC, Jr. Filipinas 212, Tumbes, Peru
- CONCEPTO AZUL, Circunvalación Norte, 528 B, Urdesa, Guayaquil, Ecuador
- CEBIOMICS S.A. Calle 28 #2624 y Avenida Flavio Reyes, Manta, Ecuador
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Cheng G, Cheng Y, Rahman E. Diversity analysis of Populus euphratica endophytic bacteria in Tarim River Basin, China. PeerJ 2023; 11:e15934. [PMID: 37663304 PMCID: PMC10470447 DOI: 10.7717/peerj.15934] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 07/31/2023] [Indexed: 09/05/2023] Open
Abstract
The bacterial diversity in Populus euphratica stem storage liquid samples grown in Shaya County and Yuli County of the Tarim River Basin was investigated. A culture-dependent (dilution spread plate method) and culture-independent method (PCR-RFLP technique) were used to identify the endophytic bacteria community structure and composition in P. euphratica in Tarim River Basin. Sixty-six bacterial strains were isolated from P. euphratica stem storage liquid samples on three agar media. The 16S rDNA gene was amplified and sequenced using bacterial universal primers. Phylogenetic analysis showed that the 66 strains belonged to three phyla (Firmicutes, Actinomycetes, and Gamma-Proteobacteria) and included 16 genera and 29 species. Among them, Pseudomonas (27.27%) and Bacillus (19.69%) were the dominant isolates. CGM-17 was a potentially new species of Pantoea. Restriction fragment length polymorphism of 16S rDNA gene amplified by polymerase chain reaction (PCR-RFLP) revealed 48 operational taxonomic units (OTUs). Phylogenetic analysis indicated that the 48 OTUs belonged to Firmicutes, Actinobacteria, Proteobacteria (α-, β-, γ-subgroup), Bacteroidetes, and Verrucomicrobia. Gamma-Proteobacteria was the dominant group, similarly to the culture-dependent method, accounting for 53% of the entire bacterial clone library. Our results indicate that P. euphratica endophytic bacteria diversity in the Tarim River Basin was rich, and the resources of endophytic bacteria were high. They provide valuable reference data and species resources for screening indigenous and functional strains of endophytic bacteria in P. euphratica.
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Affiliation(s)
- Gang Cheng
- Shangrao Normal University, College of Life Science, Shangrao, Jiangxi, China
- Xinjiang Academy of Environmental Protection Science, Xinjiang Key Laboratory for Environmental Pollution Monitoring and Risk Warning, Urumqi, Xinjiang, China
- Xinjiang University, College of Life Science and Technology, Urumqi, Xinjiang, China
| | - Yan Cheng
- Xinjiang Academy of Environmental Protection Science, Xinjiang Key Laboratory for Environmental Pollution Monitoring and Risk Warning, Urumqi, Xinjiang, China
| | - Erkin Rahman
- Xinjiang University, College of Life Science and Technology, Urumqi, Xinjiang, China
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Zhang K, Yin M, Lei S, Zhang H, Yin X, Niu Q. Bacillus sp. YC7 from intestines of Lasioderma serricorne degrades nicotine due to nicotine dehydrogenase. AMB Express 2023; 13:87. [PMID: 37603100 PMCID: PMC10441963 DOI: 10.1186/s13568-023-01593-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 08/04/2023] [Indexed: 08/22/2023] Open
Abstract
A large number of nicotine-containing wastes produced during the tobacco manufacturing process are seriously harmful to the environment and human health. The degradation and transformation of nicotine-containing environmental contaminants to harmless substances has become an urgent requirement. Lasioderma serricorne can grow and reproduce in nicotine-rich sources, and their intestinal microbiota show promising potential to degrade and utilize nicotine. The purpose of this study is to screen and identify nicotine-degrading bacteria from the intestines of L. serricorne and explore their degradation characteristics. A dominant strain, YC7, with significant nicotine degradation capabilities was isolated from the intestines of L. serricorne. The strain was identified as Bacillus using a polyphasic approach. The test results showed it can produce multiple enzymes that include β-glucosidase, cellulase, proteases, and amylases. The nicotine-degrading bacteria were functionally annotated using databases. Nicotine dehydrogenase (NDH) was found by combining an activity tracking test and protein mass spectrometry analysis. The YC-7 NDH in the pathway was molecularly docked and functionally verified via the gene knockdown method. The binding ability of nicotine to nicotine-degrading enzymes was investigated using molecular docking. A high-efficiency nicotine-degrading bacteria, YC-7, was isolated and screened from tobacco, and the gene functions related to degradation were verified. This investigation provides a new hypothesis for screening nicotine-degrading bacteria and increases our knowledge of potential nicotine-degrading microbial sources.
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Affiliation(s)
- Ke Zhang
- College of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, 90 Wangcheng Road, Luoyang, 471023, Henan, China
| | - Mingshen Yin
- College of Life Science and Agricultural Engineering, Nanyang Normal University, 1638 Wolong Road, Nanyang, 473061, Henan, China
| | - Shengwei Lei
- College of Life Science and Agricultural Engineering, Nanyang Normal University, 1638 Wolong Road, Nanyang, 473061, Henan, China
| | - Hongxin Zhang
- College of Life Science and Agricultural Engineering, Nanyang Normal University, 1638 Wolong Road, Nanyang, 473061, Henan, China
| | - Xiaoyan Yin
- College of Life Science and Agricultural Engineering, Nanyang Normal University, 1638 Wolong Road, Nanyang, 473061, Henan, China
| | - Qiuhong Niu
- College of Life Science and Agricultural Engineering, Nanyang Normal University, 1638 Wolong Road, Nanyang, 473061, Henan, China.
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Xiao W, Zhang Z, Wang H, Han G, Yan ZY, He D. Recombination of endophytic bacteria in asexual plant Ligusticum chuanxiong Hort. caused by transplanting. PeerJ 2023; 11:e15579. [PMID: 37520247 PMCID: PMC10386827 DOI: 10.7717/peerj.15579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/25/2023] [Indexed: 08/01/2023] Open
Abstract
Background Long-term asexual reproduction can easily lead to the degradation of plant germplasm, serious diseases and insect pests, reduction of production and even catastrophic crop failure. "Mountain Breeding and Dam Cultivation" is the main cultivation mode of Ligusticum chuanxiong Hort., which successfully avoided the germplasm degradation caused by long-term asexual reproduction. The recombination of endophytic fungi of L. chuanxiong caused by off-site transplantation was considered to be an important reason for its germplasm rejuvenation. However, whether bacteria have the same regularity is not yet known. Methods In this study, we carried out the experiment of cultivating propagation materials of L. chuanxiong in different regions and transplanting them to the same region. High-throughput sequencing was performed to analyze the bacterial communities in L. chuanxiong and its soil. Results The results showed that after transplanting, the plant height, tiller number, fresh weight, etc. of L. chuanxiong in mountainous areas were significantly higher than those in dam areas. At the same time, significant changes had taken place in the endophytic bacteria in reproductive material stem nodes (Lingzi, abbreviated as LZ). The diversity and abundance of bacteria in dam area LZ (YL) are significantly higher than those in mountainous area LZ (ML). The relative abundance of bacteria such as Xanthobacteraceae, Micromonosporaceae, Beijerinkiaceae, Rhodanobacteria, in ML is significantly higher than YL, mainly classified in Proteobateria and Actinobacteriota. In addition, the abundance advantage of Actinobacteriota still exists in MY (underground mature rhizomes obtained by ML). Meanwhile, the bacterial community was different in different area of transplanting. The diversity of bacterial communities in dam soil (YLS) is significantly higher than that in mountain soil (MLS). MLS had more Acidobacteriota than YLS. Comparative analysis showed that 74.38% of bacteria in ML are found in MLS, and 87.91% of bacteria in YL are found in YLS. Conclusions We can conclude that the community structure of endophytic bacteria recombined after the transplantation of L. chuanxiong, which was related to the bacterial community in soils. Moreover, after transplanting in mountainous areas, LZ accumulated more potentially beneficial Actinobacteriota, which may be an important reason for promoting the rejuvenation of germplasm in L. chuanxiong. However, this hypothesis requires more specific experiments to verify. This study provided a new idea that off-site transplanting may be a new strategy to restore vegetative plant germplasm resources.
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Affiliation(s)
- Wanting Xiao
- Key Laboratory of Characteristic Chinese Medicinal Resources in Southwest, Chengdu, Sichuan, China
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
| | - Zhanling Zhang
- Key Laboratory of Characteristic Chinese Medicinal Resources in Southwest, Chengdu, Sichuan, China
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
| | - Hai Wang
- Key Laboratory of Characteristic Chinese Medicinal Resources in Southwest, Chengdu, Sichuan, China
- College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
| | - Guiqi Han
- Key Laboratory of Characteristic Chinese Medicinal Resources in Southwest, Chengdu, Sichuan, China
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
- College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
| | - Zhu-Yun Yan
- Key Laboratory of Characteristic Chinese Medicinal Resources in Southwest, Chengdu, Sichuan, China
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
| | - Dongmei He
- Key Laboratory of Characteristic Chinese Medicinal Resources in Southwest, Chengdu, Sichuan, China
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, China
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Shu L, Li J, Xu J, Zheng Z. Nutrient removal and biogas upgrade using co-cultivation of Chlorella vulgaris and three different bacteria under various GR24 concentrations by induction with 5-deoxystrigol. World J Microbiol Biotechnol 2023; 39:245. [PMID: 37420159 DOI: 10.1007/s11274-023-03647-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 05/14/2023] [Indexed: 07/09/2023]
Abstract
Algae symbiosis technology shows great potential in the synchronous treatment of biogas slurry and biogas, which has promising applications. For improving nutrients and CO2 removal rates, the present work constructed four microalgal systems: Chlorella vulgaris (C. vulgaris) monoculture, C. vulgaris-Bacillus licheniformis (B. licheniformis), C. vulgaris-activated sludge, and C. vulgaris-endophytic bacteria (S395-2) to simultaneously treat biogas as well as biogas slurry under GR24 and 5DS induction. Our results showed that the C. vulgaris-endophytic bacteria (S395-2) showed optimal growth performance along with photosynthetic activity under the introduction of GR24 (10-9 M). Under optimal conditions, CO2 removal efficiency form biogas, together with chemical oxygen demand, total phosphorus and total nitrogen removal efficiencies from biogas slurry reached 67.25 ± 6.71%, 81.75 ± 7.93%, 83.19 ± 8.32%, and 85.17 ± 8.26%, respectively. The addition of symbiotic bacteria isolated from microalgae can promote the growth of C. vulgaris, and the exogenous addition of GR24 and 5DS can strengthen the purification performance of the algae symbiosis to achieve the maximum removal of conventional pollutants and CO2.
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Affiliation(s)
- Lixing Shu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, People's Republic of China
| | - Junfeng Li
- School of Advanced Materials and Engineering, Jiaxing Nanhu University, Jiaxing, 314001, People's Republic of China
- Jiaxing Key Laboratory of Preparation and Application of Advanced Materials for Energy Conservation and Emission Reduction, Jiaxing, 314001, People's Republic of China
| | - Jun Xu
- School of Advanced Materials and Engineering, Jiaxing Nanhu University, Jiaxing, 314001, People's Republic of China
- Jiaxing Key Laboratory of Preparation and Application of Advanced Materials for Energy Conservation and Emission Reduction, Jiaxing, 314001, People's Republic of China
| | - Zheng Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, People's Republic of China.
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Ramakrishnan P, Ariyan M, Rangasamy A, Rajasekaran R, Ramasamy K, Murugaiyan S, Janahiraman V. Draft Genome Sequence of Enterobacter cloacae S23 a Plant Growth-promoting Passenger Endophytic Bacterium Isolated from Groundnut Nodule Possesses Stress Tolerance Traits. Curr Genomics 2023; 24:36-47. [PMID: 37920731 PMCID: PMC10334703 DOI: 10.2174/1389202924666230403123208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 01/25/2023] [Accepted: 03/03/2023] [Indexed: 04/07/2023] Open
Abstract
Aim This study aims to reveal the passenger endophytic bacterium Enterobacter cloacae S23 isolated from groundnut nodules and to underpin the molecular mechanism and genes responsible for abiotic stress tolerance. Background A variety of microorganisms that contribute to nodulation and encourage plant development activity in addition to the nodulating Rhizobium. Passenger endophytes (PE) are endophytes that accidentally penetrate the plant without any selective pressure keeping them in the interior tissue of the plant. PE possesses characteristics that encourage plant development and boost output while reducing pathogen infection and improving biotic and abiotic stress tolerance. However, there is a lack of molecular evidence on the passenger endophyte-mediated alleviation of abiotic stresses. Objective This study was formulated to reveal the draft genome sequence of Enterobacter cloacae S23, as well as genes and characteristics involved in plant growth promotion and stress tolerance. Method The data were submitted to PATRIC and the TORMES-1.0 Unicyclker tools were used to conduct a complete genome study of Enterobacter cloacae S23. The TORMES-1.0 platform was used to process the reads. RAST tool kit (RASTtk) was used to annotate the S23 sequence. The plant growth-promoting traits such as indole acetic acid production, siderophore secretion, production of extracellular polysaccharides, biofilm formation, phosphate solubilization, and accumulation of osmolytes were examined under normal, 7% NaCl and 30% polyethylene glycol amended conditions to determine their ability to withstand salt and moisture stressed conditions, respectively. Result We report the size of Enterobacter cloacae S23 is 4.82Mb which contains 4511 protein-coding sequences, 71 transfer RNA genes, and 3 ribosomal RNA with a G+C content of DNA is 55.10%. Functional analysis revealed that most of the genes are involved in the metabolism of amino acids, cofactors, vitamins, stress response, nutrient solubilization (kdp, pho, pst), biofilm formation (pga) IAA production (trp), siderophore production (luc, fhu, fep, ent, ybd), defense, and virulence. The result revealed that E. cloacae S23 exhibited multiple plant growth-promoting traits under abiotic stress conditions. Conclusion Our research suggested that the discovery of anticipated genes and metabolic pathways might characterise this bacterium as an environmentally friendly bioresource to support groundnut growth through several mechanisms of action under multi-stresses.
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Affiliation(s)
- Pavithra Ramakrishnan
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Manikandan Ariyan
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
- Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Anandham Rangasamy
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Raghu Rajasekaran
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Krishnamoorthy Ramasamy
- Department of Crop Management, Vanavarayar Institute of Agriculture, Pollachi, Tamil Nadu, India
| | - SenthilKumar Murugaiyan
- Agricultural College and Research Institute, Tamil Nadu Agricultural University, Eachangkottai, India
| | - Veeranan Janahiraman
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
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Wu Q, Lin X, Li S, Liang Z, Wang H, Tang T. Endophytic Bacillus sp. AP10 harboured in Arabis paniculata mediates plant growth promotion and manganese detoxification. Ecotoxicol Environ Saf 2023; 262:115170. [PMID: 37354566 DOI: 10.1016/j.ecoenv.2023.115170] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 05/27/2023] [Accepted: 06/18/2023] [Indexed: 06/26/2023]
Abstract
Phytoremediation of heavy metal-polluted soils assisted by plant-associated endophytes, is a suitable method for plant growth and manganese (Mn) removal in contaminated soils. This investigation was conducted to evaluate the Mn-resistant endophytic resources of the Mn hyperaccumulator Arabis paniculata and their functions in the phytoremediation of Mn2+ toxicity. This study isolated an endophytic bacterium with high Mn resistance and indole-3-acetic acid (IAA) production form A. paniculata and identified it as Bacillus sp. AP10 using 16 S rRNA gene sequencing analysis. The effects of Bacillus sp. AP10 on the alleviation of Mn2+ toxicity in Arabidopsis thaliana seedlings and the molecular mechanisms were further investigated using biochemical tests and RNA-seq analysis. Under Mn2+ stress, Bacillus sp. AP10 increased the biomass, chlorophyll content and the translocation factor (TF) values of Mn in the aerial parts, while decreased the malondialdehyde (MDA) content of A. thaliana seedlings compared with that of control plants. The differentially expressed genes (DEGs) and enrichment analysis showed that Bacillus sp. AP10 could significantly increase the expression of key genes involved in cell-wall loosening, which may improve plant growth under Mn stress. Superoxide dismutase (SOD)-encoding genes were detected as DEGs after AP10 treatment. Moreover, AP10 regulated the expression of genes responsible for phenylpropanoid pathway, which may promote antioxidant flavonoids accumulation for reactive oxygen species (ROS) scavenging to improve Mn tolerance. The activation of ATP-binding cassette (ABC) transporter gene expression especially ABCB1 after AP10 stimulation, explained the elevation of metal ion binding or transport related to enhanced Mn accumulation in plants. Futhermore, AP10 might alleviate Mn toxicity through enhancing abscisic acid (ABA) responsive gene expression and ABA biosynthesis. These findings provide new insights into the functions and regulatory mechanism of Bacillus sp. AP10 in promoting plant growth, and tolerance, improving Mn accumulation and alleviating Mn2+ toxicity in plants. The application of Bacillus sp. AP10 as potential phytoremediators may be a promising strategy in Mn2+ contaminated fields. AVAILABILITY OF DATA AND MATERIALS: The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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Affiliation(s)
- Qingtao Wu
- School of Life and Health Sciences, Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Xianjing Lin
- School of Life and Health Sciences, Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Shaoqing Li
- School of Life and Health Sciences, Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Zhenting Liang
- School of Life and Health Sciences, Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Haihua Wang
- School of Life and Health Sciences, Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China.
| | - Ting Tang
- School of Life and Health Sciences, Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China.
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Zhao J, Yang L, Yang X, Zhao X, Li M, Zhao S, Zhu L, Zhan J. Degradation of 8:2 fluorotelomer carboxylic acid (8:2 FTCA) by plants and their co-existing microorganisms. J Hazard Mater 2023; 451:131129. [PMID: 36871467 DOI: 10.1016/j.jhazmat.2023.131129] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
8:2 fluorotelomer carboxylic acid (8:2 FTCA), an important precursor of perfluorocarboxylic acids (PFCAs), is widely detected in environment and biotas. Hydroponic exposures were conducted to investigate the accumulation and metabolism of 8:2 FTCA in wheat (Triticum aestivum L.) and pumpkin (Cucurbita maxima L.). Endophytic and rhizospheric microorganisms co-existing with the plants were isolated to investigate their contributions to degrade 8:2 FTCA. Wheat and pumpkin roots could take up 8:2 FTCA efficiently with the root concentration factor (RCF) as 5.78 and 8.93, respectively. 8:2 FTCA could be biotransformed to 8:2 fluorotelomer unsaturated carboxylic acid (8:2 FTUCA), 7:3 fluorotelomer carboxylic acid (7:3 FTCA), and seven PFCAs with 2-8 carbon chain length in plant roots and shoots. Cytochromes P450 (CYP450) and glutathione-S-transferase (GST) activities in plants were significantly increased, while flavin-dependent monooxygenases (FMOs) activities were not changed, suggesting that CYP 450 and GST were involved in the transformation of 8:2 FTCA in plant tissues. Twelve 8:2 FTCA-degrading endophytic (8 strains) and rhizospheric (4 strains) bacterial strains were isolated from root interior, shoot interior and rhizosphere of plants, respectively. These bacteria were identified as Klebsiella sp. based on the morphology and 16S rDNA sequence, and they could biodegrade 8:2 FTCA to intermediates and stable PFCAs.
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Affiliation(s)
- Jingyan Zhao
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Ocean Science and Technology, Dalian University of Technology, Panjin, Liaoning 124221, PR China
| | - Liping Yang
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China
| | - Xiaojing Yang
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Ocean Science and Technology, Dalian University of Technology, Panjin, Liaoning 124221, PR China
| | - Xv Zhao
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Ocean Science and Technology, Dalian University of Technology, Panjin, Liaoning 124221, PR China
| | - Minghui Li
- PetroChina Liaohe Oilfield Company, Panjin 124010, PR China
| | - Shuyan Zhao
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Ocean Science and Technology, Dalian University of Technology, Panjin, Liaoning 124221, PR China.
| | - Lingyan Zhu
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China
| | - Jingjing Zhan
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Ocean Science and Technology, Dalian University of Technology, Panjin, Liaoning 124221, PR China
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Singh S, Aghdam SA, Lahowetz RM, Brown AMV. Metapangenomics of wild and cultivated banana microbiome reveals a plethora of host-associated protective functions. Environ Microbiome 2023; 18:36. [PMID: 37085932 PMCID: PMC10120106 DOI: 10.1186/s40793-023-00493-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 04/05/2023] [Indexed: 05/03/2023]
Abstract
BACKGROUND Microbiomes are critical to plants, promoting growth, elevating stress tolerance, and expanding the plant's metabolic repertoire with novel defense pathways. However, generally microbiomes within plant tissues, which intimately interact with their hosts, remain poorly characterized. These endospheres have become a focus in banana (Musa spp.)-an important plant for study of microbiome-based disease protection. Banana is important to global food security, while also being critically threatened by pandemic diseases. Domestication and clonal propagation are thought to have depleted protective microbiomes, whereas wild relatives may hold promise for new microbiome-based biological controls. The goal was to compare metapangenomes enriched from 7 Musa genotypes, including wild and cultivated varieties grown in sympatry, to assess the host associations with root and leaf endosphere functional profiles. RESULTS Density gradients successfully generated culture-free microbial enrichment, dominated by bacteria, with all together 24,325 species or strains distinguished, and 1.7 million metagenomic scaffolds harboring 559,108 predicted gene clusters. About 20% of sequence reads did not match any taxon databases and ~ 62% of gene clusters could not be annotated to function. Most taxa and gene clusters were unshared between Musa genotypes. Root and corm tissues had significantly richer endosphere communities that were significantly different from leaf communities. Agrobacterium and Rhizobium were the most abundant in all samples while Chitinophagia and Actinomycetia were more abundant in roots and Flavobacteria in leaves. At the bacterial strain level, there were > 2000 taxa unique to each of M. acuminata (AAA genotype) and M. balbisiana (B-genotype), with the latter 'wild' relatives having richer taxa and functions. Gene ontology functional enrichment showed core beneficial functions aligned with those of other plants but also many specialized prospective beneficial functions not reported previously. Some gene clusters with plant-protective functions showed signatures of phylosymbiosis, suggesting long-standing associations or heritable microbiomes in Musa. CONCLUSIONS Metapangenomics revealed key taxa and protective functions that appeared to be driven by genotype, perhaps contributing to host resistance differences. The recovery of rich novel taxa and gene clusters provides a baseline dataset for future experiments in planta or in vivo bacterization or engineering of wild host endophytes.
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Affiliation(s)
- Simrandeep Singh
- Department of Microbiology, University of Illinois, Urbana, IL USA
| | - Shiva A. Aghdam
- Department of Biological Sciences, Texas Tech University, Lubbock, TX USA
| | - Rachel M. Lahowetz
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX USA
| | - Amanda M. V. Brown
- Department of Biological Sciences, Texas Tech University, Lubbock, TX USA
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Yuan T, Qazi IH, Yang P, Zhang X, Li J, Liu J. Analysis of endophytic bacterial flora of mulberry cultivars susceptible and resistant to bacterial wilt using metagenomic sequencing and culture-dependent approach. World J Microbiol Biotechnol 2023; 39:163. [PMID: 37067654 DOI: 10.1007/s11274-023-03599-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 03/30/2023] [Indexed: 04/18/2023]
Abstract
Endophytes have a wide range of potential in maintaining plant health and sustainable agricultural environmental conditions. In this study, we analysed the diversity of endophytic bacteria in four mulberry cultivars with different resistance capacity against bacterial wilt using metagenomic sequencing and culture-dependent approaches. We further assessed the role of 11 shared genera in the control of bacterial wilt of mulberry. The results of the present study showed that Actinobacteria, Firmicutes, and Proteobacteria were the three dominant phyla in all communities, with the representative genera Acinetobacter and Pseudomonas. The diversity analysis showed that the communities of the highly and moderately resistant varieties were more diverse compared to those of the weakly resistant and susceptible varieties. The control tests of mulberry bacterial wilt showed that Pantoea, Atlantibacter, Stenotrophomonas, and Acinetobacter were effective, with a control rate of over 80%. Microbacterium and Kosakonia were moderately effective, with a control rate between 50 and 80%. At the same time, Escherichia, Lysinibacillus, Pseudomonas, and Rhizobium were found to be less effective, with a control rate of less than 40%. In conclusion, this study provides a reasonable experimental reference data for the control of bacterial wilt of mulberry.
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Affiliation(s)
- Ting Yuan
- College of Animal Science, Regional Sericulture Training Center For Asia-Pacific, South China Agriculture University, Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Izhar Hyder Qazi
- College of Animal Science, Regional Sericulture Training Center For Asia-Pacific, South China Agriculture University, Wushan Road, Guangzhou, 510642, Guangdong, China
- Shaheed Benazir Bhutto University of Veterinary and Animal Sciences, Sakrand, 67210, Pakistan
| | - Peijia Yang
- College of Animal Science, Regional Sericulture Training Center For Asia-Pacific, South China Agriculture University, Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Xueyin Zhang
- College of Animal Science, Regional Sericulture Training Center For Asia-Pacific, South China Agriculture University, Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Jinhao Li
- College of Animal Science, Regional Sericulture Training Center For Asia-Pacific, South China Agriculture University, Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Jiping Liu
- College of Animal Science, Regional Sericulture Training Center For Asia-Pacific, South China Agriculture University, Wushan Road, Guangzhou, 510642, Guangdong, China.
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Ling L, Wang Y, Cheng W, Jiang K, Luo H, Pang M, Yue R. Research progress of volatile organic compounds produced by plant endophytic bacteria in control of postharvest diseases of fruits and vegetables. World J Microbiol Biotechnol 2023; 39:149. [PMID: 37022503 DOI: 10.1007/s11274-023-03598-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Accepted: 03/28/2023] [Indexed: 04/07/2023]
Abstract
Pathogen infestation results in significant losses of fruits and vegetables during handling, transportation, and storage. The use of synthetic fungicides has been a common measure for controlling plant pathogens. However, their excessive use of chemicals has led to increased environmental pollution, leaving large amounts of chemicals in agricultural products, posing a threat to human and animal health. There is now an increasing amount of research activities to explore safer and more innovative ways to control plant pathogens. In this regard, endophytic bacteria contribute significantly. Endophytic bacteria are ubiquitous in the internal tissues of plants without causing damage or disease to the host. Due to their high volatility and difficulties in residue in fruits and vegetables, volatile organic chemicals (VOCs) produced by endophytic bacteria have received a lot of attention in recent years. VOCs are a potential biofumigant for the effective control of postharvest fruits and vegetables diseases. This review focuses mainly on the recent progress in using endophytic bacteria VOCs to control post-harvest fruits and vegetables disease. This review provides a brief overview of the concept, characteristics, and summarises the types, application effect, and control mechanisms of endophytic bacterial VOCs. The research area that is being developed has great application value in agriculture and living practice.
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Affiliation(s)
- Lijun Ling
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China.
- Bioactive Products Engineering Research Center for Gansu Distinctive Plants, Northwest Normal University, Lanzhou, 730070, People's Republic of China.
| | - Yuanyuan Wang
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China
| | - Wenting Cheng
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China
| | - Kunling Jiang
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China
| | - Hong Luo
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China
| | - Mingmei Pang
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China
| | - Rui Yue
- College of Life Science, Northwest Normal University, 967 Anning East Road, Anning District, Lanzhou, 730070, People's Republic of China
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Li J, Wu H, Pu Q, Zhang C, Chen Y, Lin Z, Hu X, Li O. Complete genome of Sphingomonas paucimobilis ZJSH1, an endophytic bacterium from Dendrobium officinale with stress resistance and growth promotion potential. Arch Microbiol 2023; 205:132. [PMID: 36959350 DOI: 10.1007/s00203-023-03459-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 03/25/2023]
Abstract
Sphingomonas paucimobilis ZJSH1 is an endophytic bacterium isolated from the roots of Dendrobium officinale with the ability to promote plant growth. It was found that the genome of strain ZJSH1 had gene fragment rearrangement compared with the genomes of the other four strains of S. paucimobilis, and the genome was integrated with phage genes. Functional analysis showed that the strain contained colonization-related genes, chemotaxis and invasion. A variety of genes encoding active materials, such as hormones (IAA, SA, ABA and zeaxanthin), phosphate cycle, antioxidant enzymes, and polysaccharides were identified which provide the strain with growth promotion and stress-resistant characteristics. Experiments proved that S. paucimobilis ZJSH1 grew well in media containing 80 g/L sodium chloride, 240 g/L polyethylene glycol and 800 μmol/L Cd2+, indicating its potential for resistance to stresses of salt, drought and cadmium, respectively. S. paucimobilis ZJSH1 is the only endophytic bacterium of this species that has been reported to promote plant growth. The analysis of its genome is conducive to understanding its growth-promoting mechanism and laying a foundation for the development and utilization of this species in the field of agriculture.
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Affiliation(s)
- Jin Li
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China
| | - Hangtao Wu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China
| | - Qian Pu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China
| | - Chu Zhang
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China
| | - Ying Chen
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China
| | - Zhengxin Lin
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China
| | - Xiufang Hu
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China.
| | - Ou Li
- Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928th Second Avenue, Hangzhou, 310018, People's Republic of China.
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Wei J, Wang Z, Zhao C, Sun S, Xu J, Zhao Y. Effect of GR24 concentrations on tetracycline and nutrient removal from biogas slurry by different microalgae-based technologies. Bioresour Technol 2023; 369:128400. [PMID: 36442601 DOI: 10.1016/j.biortech.2022.128400] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/20/2022] [Accepted: 11/23/2022] [Indexed: 06/16/2023]
Abstract
A biogas slurry composed of carbon, nitrogen, phosphorus, and antibiotics was generated. Investigations into the nutrient and tetracycline removal performance of four microalgae-based contaminant removal technologies, including Chlorella vulgaris, C. vulgaris co-cultured with endophytic bacteria, C. vulgaris co-cultured with Ganoderma lucidum, and C. vulgaris co-cultured with G. lucidum and endophytic bacteria, were conducted. The algal-bacterial-fungal consortium with 10-9 M strigolactone (GR24) yielded the maximum growth rate and average daily yield for algae at 0.325 ± 0.03 d-1 and 0.192 ± 0.02 g L-1 d-1, respectively. The highest nutrient/ tetracycline removal efficiencies were 83.28 ± 7.95 % for chemical oxygen demand (COD), 82.62 ± 7.97 % for total nitrogen (TN), 85.15 ± 8.26 % for total phosphorus (TP) and 83.92 ± 7.65 % for tetracycline. Adding an algal-bacterial-fungal consortium with an optimal synthetic analog GR24 concentration is seemingly an encouraging strategy for enhancing pollutant removal by algae, possibly overcoming the challenges of eutrophication and antibiotic pollution.
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Affiliation(s)
- Jing Wei
- College of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing 314001, PR China
| | - Zhengfang Wang
- Suzhou Institute of Trade & Commerce, Suzhou 215000, PR China
| | - Chunzhi Zhao
- School of Ecological Technology & Engineering, Shanghai Institute of Technology, Shanghai 201400, PR China
| | - Shiqing Sun
- College of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing 314001, PR China
| | - Jie Xu
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, PR China
| | - Yongjun Zhao
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, PR China.
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Wang H, Wu B, Jiang N, Liu J, Zhao Y, Xu J, Wang H. The effects of influent chemical oxygen demand and strigolactone analog concentration on integral biogas upgrading and pollutants removal from piggery wastewater by different microalgae-based technologies. Bioresour Technol 2023; 370:128483. [PMID: 36513303 DOI: 10.1016/j.biortech.2022.128483] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 12/05/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Microalgae-based technologies are promising strategies for efficient wastewater treatment and biogas upgrading. In this study, three types of microalga-fungi/bacteria symbiotic systems stimulated with the strigolactone analog (GR24) were used to simultaneously remove nutrients from treated piggery wastewater and CO2 from biogas. The effects of initial concentrations of chemical oxygen demand (COD) and GR24 on nutrient removal and biogas upgrading were investigated. When the initial COD concentration was 1200 mg/L, the Chlorella vulgaris-Ganoderma lucidum-endophytic bacteria co-cultivation systems achieved the best photosynthetic performance and microalgae growth. Moreover, under the appropriate COD concentration (1200 mg/L), the highest nutrient/CO2 removal efficiencies were obtained. In addition, 10-9 M GR24 significantly accelerated nutrient/CO2 removal efficiencies. These findings provide a theoretical basis for scale-up experiments using microalgae-based technologies.
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Affiliation(s)
- Heyuan Wang
- Department of Endocrinology and Metabolism, The First Hospital of Jilin University, Changchun, Jilin 130021, China
| | - Bing Wu
- Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province 130000, China
| | - Nan Jiang
- Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province 130000, China
| | - Jinhua Liu
- Changchun Customs Technology Center, Changchun 130062, China
| | - Yongjun Zhao
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China
| | - Jie Xu
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China
| | - Haotian Wang
- School of Pharmaceutical Sciences, Jilin University, Changchun 130021, China.
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Wang X, Luo S, Chen Y, Zhang R, Lei L, Lin K, Qiu C, Xu H. Potential of Miscanthus floridulus associated with endophytic bacterium Bacillus cereus BL4 to remediate cadmium contaminated soil. Sci Total Environ 2023; 857:159384. [PMID: 36240921 DOI: 10.1016/j.scitotenv.2022.159384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 10/07/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
Phytoremediation assisted by endophytic bacteria is promising to efficiently remediate cadmium (Cd) contaminated soil. Bacillus cereus BL4, isolated from Miscanthus floridulus growing around a pyrite mine, exhibited high Cd tolerance and plant growth-promoting traits and could improve Cd bioavailability in soil. As a result of the pot experiment, after inoculation with strain BL4, the fresh weight, height, and Cd accumulation of Miscanthus floridulus shoots increased by 19.08-32.26 %, 6.02-16.60 %, and 23.67 %-24.88 %, respectively, and roots increased by 49.38-56.41 %, 22.87-33.93 %, and 28.51 %-42.37 %, respectively. Under Cd stress, the chlorophyll content, photosynthetic rate, and root activity of Miscanthus floridulus increased, while the membrane permeability and malonaldehyde (MDA) content significantly decreased after the inoculation of BL4, which indicated the alleviation of the cytotoxicity of Cd. Accordingly, the glutathione (GSH) content increased, and the activities of antioxidant enzymes presented downward trends after BL4 inoculation. Cd bioavailability in soil increased after BL4 inoculation, accompanied by increases in the activities of soil enzymes (invertase, urease, alkaline phosphatase, dehydrogenase, FDA hydrolase, and catalase) as well as the richness and diversity of soil bacteria. Our findings revealed that strain BL4 might strengthen the phytoremediation of Cd by Miscanthus floridulus through its effects on plant physio-biochemistry and soil microecology, which provided a basis for the relative application to Cd-contaminated soil.
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Affiliation(s)
- Xitong Wang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China
| | - Shihua Luo
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China
| | - Yahui Chen
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China
| | - Renfeng Zhang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China
| | - Ling Lei
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China
| | - Kangkai Lin
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China
| | - Chengshu Qiu
- College of Chemistry and Life Sciences, Chengdu Normal University, Chengdu 611130, Sichuan, PR China.
| | - Heng Xu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China; Key Laboratory of Environment Protection, Soil Ecological Protection and Pollution Control, Sichuan University, Department of Ecology and Environmental of Sichuan, Chengdu 610065, Sichuan, PR China.
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Li L, Sun Y, Chen F, Hao D, Tan J. An alkaline protease from Bacillus cereus NJSZ-13 can act as a pathogenicity factor in infection of pinewood nematode. BMC Microbiol 2023; 23:10. [PMID: 36627592 PMCID: PMC9830832 DOI: 10.1186/s12866-022-02752-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 12/29/2022] [Indexed: 01/12/2023] Open
Abstract
Endophytic bacteria are an important biological control for nematodes. We isolated the nematicidal Bacillus cereus NJSZ-13 from healthy Pinus elliottii trunks. Bioassay experiments showed killing of all tested nematodes by proteins from the NJSZ-13 culture filtrate within 72 h. Degradation of the nematode cuticles was observed, suggesting the action of extracellular bacterial enzymes. The responsible protease was purified by ammonium sulfate precipitation, hydrophobic interaction chromatography, ion-exchange chromatography, and SDS-PAGE. The protease had a molecular weight of 28 kDa and optimal activity at 55 °C and pH 9, indicating an alkaline protease. The study suggests the potential for using this B. cereus NJSZ-13 strain protease to prevent pinewood nematode infection.
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Affiliation(s)
- Liangliang Li
- grid.410625.40000 0001 2293 4910College of Forestry, Nanjing Forestry University, Nanjing, People’s Republic of China ,grid.418515.cInstitute of Biology Co., Ltd., Henan Academy of Sciences, Zhengzhou, People’s Republic of China
| | - Yufeng Sun
- grid.410625.40000 0001 2293 4910College of Forestry, Nanjing Forestry University, Nanjing, People’s Republic of China
| | - Fengmao Chen
- grid.410625.40000 0001 2293 4910College of Forestry, Nanjing Forestry University, Nanjing, People’s Republic of China
| | - Dejun Hao
- grid.410625.40000 0001 2293 4910College of Forestry, Nanjing Forestry University, Nanjing, People’s Republic of China
| | - Jiajin Tan
- grid.410625.40000 0001 2293 4910College of Forestry, Nanjing Forestry University, Nanjing, People’s Republic of China
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Younas H, Nazir A, Bareen FE, Thies JE. Metabolic profile and molecular characterization of endophytic bacteria isolated from Pinus sylvestris L. with growth-promoting effect on sunflower. Environ Sci Pollut Res Int 2023; 30:40147-40161. [PMID: 36607575 DOI: 10.1007/s11356-022-25118-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 12/29/2022] [Indexed: 01/07/2023]
Abstract
Endophytic bacteria inhabit plant tissues such as roots, stems, leaves, fruits, and seeds and can multiply inside plant tissue without damaging them. This study involves the isolation, characterization, metabolic profiling, and effect of endophytic bacteria isolated from the roots of Scots pine (Pinus sylvestris), on the growth of sunflower. In the current study, fifteen isolates of endophytic bacteria were obtained from the roots of Scots pine, and their molecular characterization was performed using 16 s rRNA ribotyping. The molecular characterization revealed that the strains belonged to Bacillus spp., Pseudomonas spp., Micrococcus sp., Serratia sp., Enterobacter sp., Pantoea sp., Staphylococcus sp., and Microbacterium sp. Among the isolated strains, 9 strains showed positive results for ammonium production, 12 strains for calcium solubilization, 11 strains for magnesium solubilization, 5 strains for zinc solubilization, 12 strains for phosphate solubilization, 8 strains for potassium solubilization, 10 strains for indole acetic acid (IAA) production, 9 strains for siderophore, and 6 strains for hydrogen cyanide (HCN) production. The greenhouse experiment results demonstrated that all isolated endophytic bacteria improved the shoot length, dry weight, and chlorophyll content of sunflower, whereas a significant increase was observed by PS-3 (Bacillus cereus), PS-6 (Serratia marcescens), and PS-8 (Pseudomonas putida). Besides, the concentration of nitrogen, phosphorus, and potassium were also measured in sunflower shoots, and results asserted that bacterial inoculation increased the bioavailability of these essential nutrients to plants compared to uninoculated control. Thus, these endophytic bacteria could be used as an encouraging option to improve plant growth and performance.
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Affiliation(s)
- Hajira Younas
- Institute of Botany, University of the Punjab, Lahore, 54590, Pakistan.
| | - Aisha Nazir
- Institute of Botany, University of the Punjab, Lahore, 54590, Pakistan
| | - Firdaus-E Bareen
- Institute of Botany, University of the Punjab, Lahore, 54590, Pakistan.,Institute of Molecular Biology and Biotechnology, University of Lahore, Lahore, 54000, Pakistan
| | - Janice E Thies
- Department of Crop and Soil Science, Cornell University, Ithaca, NY, 14853, USA
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Dao VHT, Do KP, Nguyen HV, Nguyen CM, Thi Tran DT, Thanh Dang TT, Nguyen TX, Dinh ST. Identification and Evaluation of the Growth Promotion of Endophytic Bacteria on in vitro Potato Plants. Pak J Biol Sci 2023; 26:371-379. [PMID: 37902078 DOI: 10.3923/pjbs.2023.371.379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
<b>Background and Objective:</b> Isolation and investigation of plant growth promoting bacteria on potato plants can provide significant information for the application of beneficial bacteria in potato production. This study aims to isolate and characterize endophytic bacteria isolated from potato roots. In addition, the potential application of endophytes in promoting potato growth under <i>in vitro</i> conditions was also investigated. <b>Materials and Methods:</b> The roots from 15 healthy potato plants were excised and surface sterilized by NaOCl and finally rinsed by sterilized water. The confirmed surface-sterilized roots were then aseptically cut into small fragments and spread onto the isolation media, followed by incubation at 27°C for up to 3 days. Six isolates that showed differences in colony morphology were selected for further investigation. All isolates were screened for IAA production, nitrogen fixation, and phosphate solubilization. <b>Results:</b> Five of the isolates were identified as <i>Bacillus</i> and isolate 30 was identified as <i>Paenibacillus alvei</i>. All isolates exhibited good IAA production. While Iso-27 had no nitrogen fixation activity, Iso-28 showed the highest level of nitrogen fixation activity (3.59 mg L<sup>1</sup>), four isolates (Iso-9, Iso-10, Iso-11, Iso-28) could solubilize phosphate, ranging from 49.64 g L<sup>1</sup> to 67.98 mg L<sup>1</sup>. After being inoculated with <i>in vitro</i> potato plants, isolates 9, 10, 28, 30, improved the stalk length, root number, fresh mass and dried mass of the potato plants. <b>Conclusion:</b> The four isolates can potentially be applied in <i>in vitro</i> potato culture.
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Mahlangu SG, Tai SL. Morphological and molecular characterization of bacterial endophytes from Centella asiatica leaves. J Genet Eng Biotechnol 2022; 20:171. [PMID: 36576696 PMCID: PMC9797633 DOI: 10.1186/s43141-022-00456-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 12/17/2022] [Indexed: 12/29/2022]
Abstract
BACKGROUND Endophytes are a rich source of novel, distinct, and applicable compounds of interest in agricultural, medical, cosmetic, and pharmaceutical industries. In this respect, they have been attracting growing interest in the past few years. Endophytes are defined as microorganisms such as bacteria and fungi which have a mutualistic relationship with their host plants without causing any harm to their host. In this study, we isolated and identified bacterial endophytes from Centella asiatica collected in Western Cape, South Africa. RESULTS Twenty bacterial endophytes were isolated from Centella asiatica and characterized by using morphological and molecular techniques. Based on molecular traits, the isolates were identified as Pseudomonas sp. strain SGM1, Pseudomonas sp. strain SGM2, Pseudomonas sp. strain SGM3, Pseudomonas sp. strain SGM4, Pseudomonas sp. strain SGM5, Pseudomonas sp. strain SGM6, Pseudomonas sp. strain SGM7, Novosphingobium sp. strain SGM8, Pseudomonas sp. strain SGM9, Pseudomonas sp. strain SGM10, Chryseobacterium sp. strain SGM11, Enterobacter sp. strain SGM12, Enterobacter sp. strain SGM13, Pseudomonas sp. strain SGM14, Enterobacter sp. strain SGM15, Enterobacter sp. strain SGM16, Agrobacterium sp. strain SGM17, Pantoea sp. strain SGM18, Paraburkholderia sp. strain SGM19, and Pseudomonas sp. strain SGM20. Pseudomonas genus was dominant with eleven isolates. Morphological trait results showed that all isolates were gram-negative rod-shaped bacteria. CONCLUSION According to our understanding, this study revealed the first twenty endophytic bacteria isolated from Centella asiatica growing in the Western Cape Province, South Africa. Data obtained in the current study will increase the knowledge of the already existing microbial diversity associated with Centella asiatica. Further work is needed to evaluate the antioxidant and antibacterial activities in vitro and assess the growth and medicinal compounds of the identified endophytic bacteria in a laboratory scale bioreactors.
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Affiliation(s)
- Siphiwe G. Mahlangu
- grid.7836.a0000 0004 1937 1151Department of Chemical Engineering, Centre for Bioprocess Engineering Research, University of Cape Town, Private Bag X3, Rondebosch, Cape Town, 7701 South Africa
| | - Siew L. Tai
- grid.7836.a0000 0004 1937 1151Department of Chemical Engineering, Centre for Bioprocess Engineering Research, University of Cape Town, Private Bag X3, Rondebosch, Cape Town, 7701 South Africa ,grid.11956.3a0000 0001 2214 904XDepartment of Chemical Engineering, Stellenbosch University, Private Bag X1, Matieland, 7602 South Africa
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Cheng X, Cao X, Tan C, Liu L, Bai J, Liang Y, Cai R. Effects of four endophytic bacteria on cadmium speciation and remediation efficiency of Sedum plumbizincicola in farmland soil. Environ Sci Pollut Res Int 2022; 29:89557-89569. [PMID: 35852747 DOI: 10.1007/s11356-022-21711-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 06/24/2022] [Indexed: 06/15/2023]
Abstract
Cadmium (Cd) pollution in farmland soils severely affects agricultural production safety, thereby threatening human health. Sedum plumbizincicola is a Cd and Zn hyperaccumulator commonly used for the phytoremediation of Cd-contaminated soil. This study was aimed to improve the remediation effect of S. plumbizincicola on Cd-contaminated farmland soil and provide a theoretical basis for the enhancement of endophytic bacteria in the repair of Cd-contaminated soil with S. plumbizincicola. Four kinds of endophytic bacteria, namely Buttiauxella, Pedobacter, Aeromonas eucrenophila, and Ralstonia pickettii, were used, and soil culture experiments and pot experiments were conducted to explore the effects of endophytic bacteria on soil Cd speciation and phytoremediation efficiency of Cd-contaminated farmland soils. Under the experimental conditions, after inoculation with endophytic bacteria, the soil pH was effectively reduced, content of weak acid-extracted Cd and oxidizable Cd increased, and content of reducible Cd and residual Cd decreased. Soil Cd activity was increased, and the availability coefficient of soil Cd increased by 1.15 to 6.41 units compared with that of the control (CK2). Compared with CK2, the biomass of S. plumbizincicola significantly increased by 23.23-55.12%; Cd content in shoots and roots of S. plumbizincicola increased by 29.63-46.01% and 11.42-84.47%, respectively; and bioconcentration factor was 2.13 to 2.72 times that of CK2. The Cd removal rate of S. plumbizincicola monocropping was 48.25%. When S. plumbizincicola was planted with inoculating endophytic bacteria, the Cd removal rate in the soil reached 61.18-71.49%, which was significantly higher than that of CK2 (p < 0.05). The treatment with endophytic bacteria activated soil Cd, promoted the growth of S. plumbizincicola, increased its Cd content, and enhanced the phytoremediation of Cd-contaminated farmland soil. Therefore, endophytic bacteria can be used to improve the remediation efficiency of S. plumbizincicola in Cd-contaminated farmland soils.
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Affiliation(s)
- Xueyu Cheng
- School of Geographic Sciences, Hunan Normal University, Changsha, 410081, People's Republic of China
| | - Xueying Cao
- Rural Vitalization Research Institute, Changsha University, Changsha, 410022, People's Republic of China
| | - Changyin Tan
- School of Geographic Sciences, Hunan Normal University, Changsha, 410081, People's Republic of China.
| | - Lulu Liu
- School of Geographic Sciences, Hunan Normal University, Changsha, 410081, People's Republic of China
| | - Jia Bai
- School of Geographic Sciences, Hunan Normal University, Changsha, 410081, People's Republic of China
| | - Yufeng Liang
- School of Geographic Sciences, Hunan Normal University, Changsha, 410081, People's Republic of China
| | - Runzhong Cai
- School of Geographic Sciences, Hunan Normal University, Changsha, 410081, People's Republic of China
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Xu B, Zhao Y, Zhao C, Wei J. Effect of different CO 2 concentrations on biogas upgrading and nutrient removal by microalgae-fungi co-culture. Environ Sci Pollut Res Int 2022; 29:91345-91355. [PMID: 35896875 DOI: 10.1007/s11356-022-22165-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 07/19/2022] [Indexed: 06/15/2023]
Abstract
Owing to the high carbon dioxide (CO2)-fixation efficiency, microalgae-based technology has been widely used for biogas purification. The present study explored the effect of CO2 concentration on biogas purification by an algal-fungal-bacterial symbiotic system. Two algal-fungal-bacterial symbiotic systems were cultivated to purify four simulated biogas samples with different CO2 concentrations. The results showed that GR24, a synthetic analog of strigolactone, stimulated the growth of the algal-fungal-bacterial symbiotic system. The optimal CO2 concentration for the purification of the simulated biogas was 45% (V/V), and the optimal symbiotic system was Chlorella vulgaris-Ganoderma lucidum-endophytic bacteria-GR24. The maximum chemical oxygen demand (COD; 82.61 ± 7.73%), total nitrogen (TN; 81.36 ± 7.97%), total phosphorus (TP; 85.69 ± 8.19), and CO2 (69.23 ± 6.56%) removal efficiencies were detected with the addition of 10-9 M GR24 to the C. vulgaris-G. lucidum-endophytic bacterial symbiotic system. These findings confirmed the effect of CO2 concentration on the purification of biogas by the algal-bacterial symbiotic system. The study provides a theoretical basis for further research on the treatment of wastewater and biogas.
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Affiliation(s)
- Bing Xu
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, 250101, China
| | - Yongjun Zhao
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, People's Republic of China
| | - Chunzhi Zhao
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 200235, People's Republic of China
| | - Jing Wei
- College of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing, 314001, People's Republic of China.
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Yang YQ, Deng SF, Yang YQ, Ying ZY. Comparative analysis of the endophytic bacteria inhabiting the phyllosphere of aquatic fern Azolla species by high-throughput sequencing. BMC Microbiol 2022; 22:246. [PMID: 36221067 PMCID: PMC9552495 DOI: 10.1186/s12866-022-02639-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Accepted: 09/13/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Azolla is a small floating fern living in symbiosis with nitrogen-fixing cyanobacteria and provides a variety of important ecosystem benefits. Previous studies have presented that Azolla harbors diverse bacteria that may play a key role in host fitness and productivity. However, the characteristics of endophytic bacteria inhabiting the phyllosphere of different species of Azolla have not yet been fully understood. RESULTS In this study, the 16S ribosomal DNA (rDNA) V5-V7 region of bacteria was determined by Illumina high-throughput sequencing platform to study the diversity and richness of endophytic bacterial communities in the phyllosphere of five Azolla species collected from different countries. A total of 1150 operational taxonomic units (OTUs) were detected for the endophytic bacteria community. According to the α diversity indices, the diversity of bacteria was ordered as Azolla imbricata > A. pinnata > A. filiculoides > A. mexicana > A. caroliniana. The PCoA results displayed that the bacterial communities of A. mexicana and A. caroliniana shared the highest similarity, followed by the similarity between A. pinnata and A. imbricata, and they were significantly distinct from the community of A. filiculoides. The dominant bacteria of Azolla mainly belonged to the phylum of Proteobacteria, followed by Actinobacteria, Chlorobillobacteria, and Firmicutes. In detail, the relative abundance of Proteobacteria in A. imbricata was 52.23%, whereas it was more than 80.00% in the other four species of Azolla. Notably, Herbaspirillum (45.91%, 44.08%) and Methylophilus (29.97%, 37.96%) were the main genera inhabiting A. mexicana and A. caroliniana respectively. Ferrovibrio (18.54%) and Rhizobium (16.68%) were the dominant genera inhabiting A. filiculoides. The group of unidentified genera (41.63%, 44.92%) consisted most of the bacteria in A. imbricata and A. pinnata respectively. Further analysis suggested that the significant different bacteria identified in LDA Effect Size analysis existed Azolla species-specific patterns. CONCLUSIONS In summary, all results suggested that the diversity and composition of the endophytic bacterial communities were different in Azolla species.
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Affiliation(s)
- Yan-Qiu Yang
- Agricultural Ecology Institute, Fujian Academy of Agricultural Sciences, Fuzhou, China. .,National Azolla Germplasm Resource Center, Fuzhou, China.
| | - Su-Fang Deng
- Agricultural Ecology Institute, Fujian Academy of Agricultural Sciences, Fuzhou, China.,National Azolla Germplasm Resource Center, Fuzhou, China
| | - You-Quan Yang
- Agricultural Ecology Institute, Fujian Academy of Agricultural Sciences, Fuzhou, China.,National Azolla Germplasm Resource Center, Fuzhou, China
| | - Zhao-Yang Ying
- Agricultural Ecology Institute, Fujian Academy of Agricultural Sciences, Fuzhou, China. .,National Azolla Germplasm Resource Center, Fuzhou, China.
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Murthy MK, Khandayataray P, Samal D. Chromium toxicity and its remediation by using endophytic bacteria and nanomaterials: A review. J Environ Manage 2022; 318:115620. [PMID: 35772275 DOI: 10.1016/j.jenvman.2022.115620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 05/13/2022] [Accepted: 06/23/2022] [Indexed: 06/15/2023]
Abstract
Chromium (Cr) is a crucial element for all life forms. Various anthropogenic activities have been responsible for environmental contamination with Cr (VI) in recent years. For this review, articles were collected using electronic databases such as Web of Science, Pubmed, ProQuest, and Google Scholar as per the guidelines of PRISMA-2015, applying the Boolean search methods. Chromium can cause severe health complications in humans and animals and threatens the surrounding environment, with negative impacts on crop yield, development, and quality. Hence, monitoring Cr contamination is essential, and various remediation technologies have emerged in the past 50 years to reduce the amount of Cr in the environment. This review focuses on chromium exposure and the associated environmental health risks. We also reviewed sustainable remediation processes, with emphasis on nanoparticle and endophytic remediation processes.
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Affiliation(s)
| | | | - Dibyaranjan Samal
- Department of Biotechnology, Academy of Management and Information Technology, VidyaVihar, IID Center, Khordha, Odisha, India
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Shuang M, Wang Y, Teng W, Jin G. Isolation and identification of an endophytic bacteria Bacillus sp. K-9 exhibiting biocontrol activity against potato common scab. Arch Microbiol 2022; 204:483. [PMID: 35833995 DOI: 10.1007/s00203-022-02989-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 11/02/2022]
Abstract
Potato scab is an important soil-borne disease that can significantly reduce the quality and economic value of potatoes. The purpose of this study was to isolate, screen and identify endophytic bacteria that have antagonistic and control effects on potato scab disease, and to determine the control effect and yield traits of the selected strains on potato scab disease in field conditions. A bacterial strain K-9 was isolated from the junction between scab spot and healthy epidermis of potato tuber. The K-9 strain was identified as Bacillus sp. through morphological, physiological and biochemical characterization, and 16S rDNA and gyrB gene sequence analysis. The diameter of the inhibition zone of strain K-9 against Streptomyces scabies on the YME plate was 3.82 cm. The K-9 strain could inhibit eight types of crop pathogens, with the highest inhibition rate (70.39%) against another soil-borne potato disease (potato black scurf). In the field test, the control effect of K-9 strain against potato scab was not significantly different from that of mixed bacteria or chemical agents, but the disease index and the scab index in the K-9 treatment were significantly lower than in the control. The potato yield in the K-9 treatment was 12.44% higher than the control. In summary, the K-9 strain can prevent not only potato scab, but also increase potato yield. Therefore, the endophytic bacterial K-9 strain may be a potential biological control agent.
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Affiliation(s)
- Ma Shuang
- College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
- Keshan branch, Heilongjiang Academy of Agricultural Sciences, Keshan, 161606, China
| | - Yanjie Wang
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, China.
| | - Wang Teng
- College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
| | - Guanghui Jin
- College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
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de Oliveira AA, Ramalho MDO, Moreau CS, Campos AEDC, Harakava R, Bueno OC. Exploring the diversity and potential interactions of bacterial and fungal endophytes associated with different cultivars of olive (Olea europaea) in Brazil. Microbiol Res 2022; 263:127128. [PMID: 35868260 DOI: 10.1016/j.micres.2022.127128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/09/2022] [Accepted: 07/11/2022] [Indexed: 10/17/2022]
Abstract
The olive crop has expanded in the southeastern region of South America, particularly in Brazil. Thus, the objectives of this study were to identify the diversity of endophytic microorganisms associated with olive leaves with culture-dependent and culture-independent methods, to explore which factors influence the composition and abundance of this microbial community, to identify the trophic mode of these fungi by FunGuild and, to verify type associations between bacterial and fungal communities. Leaf samples were collected from 93 plants in nine locations in the Brazilian states of São Paulo and Minas Gerais. Leaves were first superficially disinfected before fungal isolation and next-generation metabarcoding sequencing was completed targeting the 16S rRNA regions for bacteria and ITS1 for fungi. In total, 800 isolates were obtained, which were grouped into 191 morphotypes and molecularly identified, resulting in 38 genera, 32 of which were recorded for the first time in cultivated olive trees in Brazil. For the isolated fungi, the most abundant trophic level was pathotrophic and for the culture-independent method was unidentified followed by symbiotrophic. The metabarcoding results revealed that factors such as plant age, altitudinal gradient, and geographic location can influence the microbial community of commercial olive plants, while the specific cultivar did not.
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Affiliation(s)
- Amanda Aparecida de Oliveira
- São Paulo State University (UNESP) - Institute of Biosciences - Campus Rio Claro, Department of General and Applied Biology. Center for Social Insect Studies, Rio Claro, SP 13506-900, Brazil; Biological Institute of São Paulo - Vila Mariana, São Paulo, SP 04014-002, Brazil.
| | | | - Corrie Saux Moreau
- Cornell University, Department of Entomology, Ithaca, NY 14853, USA; Cornell University, Department of Ecology and Evolutionary Biology, Ithaca, NY 14853, USA
| | | | - Ricardo Harakava
- Biological Institute of São Paulo - Vila Mariana, São Paulo, SP 04014-002, Brazil
| | - Odair Correa Bueno
- São Paulo State University (UNESP) - Institute of Biosciences - Campus Rio Claro, Department of General and Applied Biology. Center for Social Insect Studies, Rio Claro, SP 13506-900, Brazil
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Zhu N, Meng T, Li S, Yu C, Tang D, Wang Y, Leng F, Ma J. Improved growth and metabolite accumulation in Codonopsis pilosula (Franch.) Nannf. by inoculation with the endophytic Geobacillu sp. RHBA19 and Pseudomonas fluorescens RHBA17. J Plant Physiol 2022; 274:153718. [PMID: 35598432 DOI: 10.1016/j.jplph.2022.153718] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 05/07/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
In this study, we focused on the plant-growth-promoting properties of two strains isolated from Codonopsis pilosula, and the effect of inoculation with different strain treatments on physiological and metabolite accumulation of C. pilosula. The strains RHBA19 and RHBA17 were isolated and identified as Geobacillu sp. and Pseudomonas fluorescens, respectively. The two strains produced indole acetic acid (IAA), siderophore, biofilm, and various exoenzymes. Based on the pot experiments, inoculation of RHBA19 (G group) and the two mixed bacteria (M group) significantly improved the growth, root development, and photosynthesis of C. pilosula. Compared with the no-inoculation group (CK), the total polysaccharide content of root in the G and M groups was dramatically enhanced by 59.27% and 96.07%, and the lobetyolin (root) improved by 58.4% and 66.0%, respectively. After inoculation with bacteria agents, the activities of antioxidant enzymes (CAT, POD, SOD) of C. pilosula increased differentially. Inoculation with two types of bacterial agents significantly increased the activities of sucrose synthase (SS) and sucrose phosphate synthase (SPS) in root, and phenylalanine ammonia lyase (PAL) in leaf of C. pilosula. In addition, the content of signaling molecules (NO and H2O2) in three types of tissue increased significantly. The magnitude of these results was higher with mixtures than with individual strains. These results imply that the two types of bacterial agents induce physiological metabolism changes to accumulate polysaccharides and lobetyolin by regulating stress resistance enzymes and signal molecules, especially NO and H2O2.
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Affiliation(s)
- Ning Zhu
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
| | - Tongtong Meng
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
| | - Shaowei Li
- Lhasa National Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Chenqun Yu
- Lhasa National Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Dan Tang
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China.
| | - Yonggang Wang
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China.
| | - Feifan Leng
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
| | - Jianzhong Ma
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
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Oviedo-Pereira DG, López-Meyer M, Evangelista-Lozano S, Sarmiento-López LG, Sepúlveda-Jiménez G, Rodríguez-Monroy M. Enhanced specialized metabolite, trichome density, and biosynthetic gene expression in Stevia rebaudiana (Bertoni) Bertoni plants inoculated with endophytic bacteria Enterobacter hormaechei. PeerJ 2022; 10:e13675. [PMID: 35782100 PMCID: PMC9248782 DOI: 10.7717/peerj.13675] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 06/13/2022] [Indexed: 01/17/2023] Open
Abstract
Stevia rebaudiana (Bertoni) Bertoni is a plant of economic interest in the food and pharmaceutical industries due its steviol glycosides (SG), which are rich in metabolites that are 300 times sweeter than sucrose. In addition, S. rebaudiana plants contain phenolic compounds and flavonoids with antioxidant activity. Endophytic bacteria promote the growth and development and modulate the metabolism of the host plant. However, little is known regarding the role of endophytic bacteria in the growth; synthesis of SG, flavonoids and phenolic compounds; and the relationship between trichome development and specialized metabolites in S. rebaudiana, which was the subject of this study. The 12 bacteria tested did not increase the growth of S. rebaudiana plants; however, the content of SG increased with inoculation with the bacteria Enterobacter hormaechei H2A3 and E. hormaechei H5A2. The SG content in leaves paralleled an increase in the density of glandular, short, and large trichome. The image analysis of S. rebaudiana leaves showed the presence of SG, phenolic compounds, and flavonoids principally in glandular and short trichomes. The increase in the transcript levels of the KO, KAH, UGT74G1, and UGT76G1 genes was related to the SG concentration in plants of S. rebaudiana inoculated with E. hormaechei H2A3 and E. hormaechei H5A2. In conclusion, inoculation with the stimulating endophytes E. hormaechei H2A3 and E. hormaechei H5A2 increased SG synthesis, flavonoid content and flavonoid accumulation in the trichomes of S. rebaudiana plants.
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Affiliation(s)
- Dumas G. Oviedo-Pereira
- Biotecnología, Instituto Politécnico Nacional Centro de Desarrollo de Productos Bióticos, Yautepec, Morelos, México
| | - Melina López-Meyer
- Departamento de Biotecnología Agrícola, Instituto Politécnico Nacional. Centro Interdisciplinario de Investigación Para el Desarrollo Integral Regional (CIIDIR), Guasave, Sinaloa, México
| | - Silvia Evangelista-Lozano
- Biotecnología, Instituto Politécnico Nacional Centro de Desarrollo de Productos Bióticos, Yautepec, Morelos, México
| | - Luis G. Sarmiento-López
- Departamento de Biotecnología Agrícola, Instituto Politécnico Nacional. Centro Interdisciplinario de Investigación Para el Desarrollo Integral Regional (CIIDIR), Guasave, Sinaloa, México
| | - Gabriela Sepúlveda-Jiménez
- Biotecnología, Instituto Politécnico Nacional Centro de Desarrollo de Productos Bióticos, Yautepec, Morelos, México
| | - Mario Rodríguez-Monroy
- Biotecnología, Instituto Politécnico Nacional Centro de Desarrollo de Productos Bióticos, Yautepec, Morelos, México
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