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Garai S, Bhowal B, Gupta M, Sopory SK, Singla-Pareek SL, Pareek A, Kaur C. Role of methylglyoxal and redox homeostasis in microbe-mediated stress mitigation in plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 338:111922. [PMID: 37952767 DOI: 10.1016/j.plantsci.2023.111922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 10/04/2023] [Accepted: 11/07/2023] [Indexed: 11/14/2023]
Abstract
One of the general consequences of stress in plants is the accumulation of reactive oxygen (ROS) and carbonyl species (like methylglyoxal) to levels that are detrimental for plant growth. These reactive species are inherently produced in all organisms and serve different physiological functions but their excessive accumulation results in cellular toxicity. It is, therefore, essential to restore equilibrium between their synthesis and breakdown to ensure normal cellular functioning. Detoxification mechanisms that scavenge these reactive species are considered important for stress mitigation as they maintain redox balance by restricting the levels of ROS, methylglyoxal and other reactive species in the cellular milieu. Stress tolerance imparted to plants by root-associated microbes involves a multitude of mechanisms, including maintenance of redox homeostasis. By improving the overall antioxidant response in plants, microbes can strengthen defense pathways and hence, the adaptive abilities of plants to sustain growth under stress. Hence, through this review we wish to highlight the contribution of root microbiota in modulating the levels of reactive species and thereby, maintaining redox homeostasis in plants as one of the important mechanisms of stress alleviation. Further, we also examine the microbial mechanisms of resistance to oxidative stress and their role in combating plant stress.
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Affiliation(s)
- Sampurna Garai
- International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Bidisha Bhowal
- International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Mayank Gupta
- International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Sudhir K Sopory
- International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Sneh L Singla-Pareek
- International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Ashwani Pareek
- National Agri-Food Biotechnology Institute, SAS Nagar, Mohali, Punjab 140306, India
| | - Charanpreet Kaur
- National Agri-Food Biotechnology Institute, SAS Nagar, Mohali, Punjab 140306, India.
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2
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Dunn MF, Becerra-Rivera VA. The Biosynthesis and Functions of Polyamines in the Interaction of Plant Growth-Promoting Rhizobacteria with Plants. PLANTS (BASEL, SWITZERLAND) 2023; 12:2671. [PMID: 37514285 PMCID: PMC10385936 DOI: 10.3390/plants12142671] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/12/2023] [Accepted: 07/15/2023] [Indexed: 07/30/2023]
Abstract
Plant growth-promoting rhizobacteria (PGPR) are members of the plant rhizomicrobiome that enhance plant growth and stress resistance by increasing nutrient availability to the plant, producing phytohormones or other secondary metabolites, stimulating plant defense responses against abiotic stresses and pathogens, or fixing nitrogen. The use of PGPR to increase crop yield with minimal environmental impact is a sustainable and readily applicable replacement for a portion of chemical fertilizer and pesticides required for the growth of high-yielding varieties. Increased plant health and productivity have long been gained by applying PGPR as commercial inoculants to crops, although with uneven results. The establishment of plant-PGPR relationships requires the exchange of chemical signals and nutrients between the partners, and polyamines (PAs) are an important class of compounds that act as physiological effectors and signal molecules in plant-microbe interactions. In this review, we focus on the role of PAs in interactions between PGPR and plants. We describe the basic ecology of PGPR and the production and function of PAs in them and the plants with which they interact. We examine the metabolism and the roles of PAs in PGPR and plants individually and during their interaction with one another. Lastly, we describe some directions for future research.
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Affiliation(s)
- Michael F Dunn
- Programa de Genómica Funcional de Procariotes, Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca 62210, Mexico
| | - Víctor A Becerra-Rivera
- Programa de Genómica Funcional de Procariotes, Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca 62210, Mexico
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3
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Ou T, Gao H, Jiang K, Yu J, Zhao R, Liu X, Zhou Z, Xiang Z, Xie J. Endophytic Klebsiella aerogenes HGG15 stimulates mulberry growth in hydro-fluctuation belt and the potential mechanisms as revealed by microbiome and metabolomics. Front Microbiol 2022; 13:978550. [PMID: 36033884 PMCID: PMC9417544 DOI: 10.3389/fmicb.2022.978550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Accepted: 07/29/2022] [Indexed: 11/24/2022] Open
Abstract
Growth promotion and stress tolerance induced by endophytes have been observed in various plants, but their effects on mulberry regularly suffering flood in the hydro-fluctuation belt are less understood. In the present study, endophytic Klebsiella aerogenes HGG15 was screened out from 28 plant growth promotion (PGP) bacteria as having superior PGP traits in vitro and in planta as well as biosafety for silkworms. K. aerogenes HGG15 could actively colonize into roots of mulberry and subsequently transferred to stems and leaves. The 16S ribosomal RNA (V3–V4 variable regions) amplicon sequencing revealed that exogenous application of K. aerogenes HGG15 altered the bacterial community structures of mulberry roots and stems. Moreover, the genus of Klebsiella was particularly enriched in inoculated mulberry roots and was positively correlated with mulberry development and soil potassium content. Untargeted metabolic profiles uncovered 201 differentially abundant metabolites (DEMs) between inoculated and control mulberry, with lipids and organo-heterocyclic compounds being particularly abundant DEMs. In addition, a high abundance of abiotic stress response factors and promotion growth stimulators such as glycerolipid, sphingolipid, indole, pyridine, and coumarin were observed in inoculated mulberry. Collectively, the knowledge gained from this study sheds light on potential strategies to enhance mulberry growth in hydro-fluctuation belt, and microbiome and metabolite analyses provide new insights into the growth promotion mechanisms used by plant-associated bacteria.
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Affiliation(s)
- Ting Ou
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Haiying Gao
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Kun Jiang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Jing Yu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Ruolin Zhao
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Xiaojiao Liu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Zeyang Zhou
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
- College of Life Science, Chongqing Normal University, Chongqing, China
| | - Zhonghuai Xiang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Jie Xie
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
- *Correspondence: Jie Xie,
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4
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Onwe RO, Onwosi CO, Ezugworie FN, Ekwealor CC, Okonkwo CC. Microbial trehalose boosts the ecological fitness of biocontrol agents, the viability of probiotics during long-term storage and plants tolerance to environmental-driven abiotic stress. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150432. [PMID: 34560451 DOI: 10.1016/j.scitotenv.2021.150432] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/10/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Despite the impressive gain in agricultural production and greater availability of food, a large portion of the world population is affected by food shortages and nutritional imbalance. This is due to abiotic stresses encountered by plants as a result of environmental-driven perturbations, loss of viability of starter cultures (probiotics) for functional foods during storage as well as the vulnerability of farm produce to postharvest pathogens. The use of compatible solutes (e.g., trehalose, proline, etc.) has been widely supported as a solution to these concerns. Trehalose is one of the widely reported microbial- or plant-derived metabolites that help microorganisms (e.g., biocontrol agents, probiotics and plant growth-promoting bacteria) and plants to tolerate harsh environmental conditions. Due to its recent categorization as generally regarded as safe (GRAS), trehalose is an essential tool for promoting nutrition-sensitive agriculture by replacing the overuse of chemical agents (e.g., pesticides, herbicides). Therefore, the current review evaluated the progress currently made in the application of trehalose in sustainable agriculture. The challenges, opportunities, and future of this biometabolite in food security were highlighted.
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Affiliation(s)
- Reuben O Onwe
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Chukwudi O Onwosi
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria; Bioconversion and Renewable Energy Research Unit, University of Nigeria, Nsukka, Enugu State, Nigeria.
| | - Flora N Ezugworie
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria; Bioconversion and Renewable Energy Research Unit, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Chito C Ekwealor
- Department of Applied Microbiology and Brewing, Faculty of Biosciences, Nnamdi Azikiwe University, P.M.B. 5025, Awka, Anambra State, Nigeria
| | - Chigozie C Okonkwo
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
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Ni L, Xu Y, Chen L. First Experimental Evidence for the Presence of Potentially Virulent Klebsiella oxytoca in 14 Species of Commonly Consumed Aquatic Animals, and Phenotyping and Genotyping of K. oxytoca Isolates. Antibiotics (Basel) 2021; 10:antibiotics10101235. [PMID: 34680815 PMCID: PMC8532785 DOI: 10.3390/antibiotics10101235] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 11/16/2022] Open
Abstract
Klebsiella oxytoca is a recently emerging pathogen that can cause necrotizing enterocolitis, hemorrhagic colitis, sepsis-associated purpura fulminans, and infective endocarditis in humans. The bacterium is ubiquitous in water and soil environments. Nevertheless, current literature on K. oxytoca in aquatic products is rare. In this study, we surveyed K. oxytoca contamination in 41 species of consumable aquatic animals sold in July, August, and September of 2018 and 2019 in Shanghai, China, 40 of which had no history of carrying this bacterium. K. oxytoca was for the first time isolated from 14 species with high abundance in benthic animals. None of the K. oxytoca isolates (n = 125) harbored toxin genes mviM, tisB, and yqgB. However, a high occurrence of virulence-associated genes was observed, including brkB (73.6%), cdcB (66.4%), pduV (64.8%), and virk (63.2%). Resistance to sulphamethoxazole-trimethoprim (56.0%) was the most predominant among the isolates, followed by chloramphenicol (6.4%), tetracycline (5.6%), and kanamycin (3.2%). Approximately 8.0% of the isolates displayed multidrug resistant phenotypes. Meanwhile, high percentages of the isolates tolerated the heavy metals Cu2+ (84.8%), Pb2+ (80.8%), Cr3+ (66.4%), Zn2+ (66.4%), and Hg2+ (49.6%). Different virulence and resistance profiles were observed among K. oxytoca isolates in 3 types and 14 species of aquatic animals. The ERIC-PCR-based genome fingerprinting of the 125 K. oxytoca isolates revealed 108 ERIC genotypes with 79 singletons, which demonstrated the genetic diversity of the isolates. The results of this study fill gaps for policy and research in the risk assessment of K. oxytoca in consumable aquatic animals.
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Affiliation(s)
- Ling Ni
- Key Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs of China, College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; (L.N.); (Y.X.)
- Laboratory of Food Quality and Safety Testing, Shanghai Ocean University, Shanghai 201306, China
| | - Yingwei Xu
- Key Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs of China, College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; (L.N.); (Y.X.)
| | - Lanming Chen
- Key Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs of China, College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; (L.N.); (Y.X.)
- Correspondence:
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Re-vitalizing of endophytic microbes for soil health management and plant protection. 3 Biotech 2021; 11:399. [PMID: 34422540 DOI: 10.1007/s13205-021-02931-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 07/15/2021] [Indexed: 12/18/2022] Open
Abstract
Soil health management and increase crop productivity are challenging issues for researchers and scientists. Many research publications have given multiple technological solutions for improving soil health and crop productivity but main problem is sustainability of those technologies under field condition and different agro-climatic zone. Due to the random industrialization, deforestation, mining and other environmental factor reduce soil fertility and human health. Many alternative options e.g., crop rotation, green manuring, integrated farming, biofertilizer (plant-growth-promoting microorganism, microbial consortium of rhizosphere soils), and vermicomposting are available for adapting and improving the soil heath and crop productivity by farmers. Recent trends of new research dimension for sustainable agriculture, endophytic microbes and its consortium is one of the better alternative for increasing crop productivity, soil health and fertility management. However, current trends are focuses on the endophytic microbes, which are present mostly in all plant species. Endophytic microbes are isolated from plant parts-root, shoot, leaf, flower and seeds which have very potential ability of plant growth promotion and bio-controlling agent for enhancing plant growth and development. Mostly plant endophytes showed multi-dimensional (synergistic, mutualistic, symbiotic etc.) interactions within the host plants. It promotes the plant growth, protects from pathogen, and induces resistance against biotic and abiotic environmental stresses, and improves the soil fertility. Till date, most of the scientific research has been done on assuming that interaction of plant endophytes with the host is similar like the plant-growth-promoting microorganism (PGPM). It would be very interesting to explore the functional properties of plant endophytes to modulate the essential gene expression during biotic and abiotic stresses. Endophytes have the ability to induce the soil fertility by improving soil essential nutrient, enzymatic activity and influence the other physiochemical property. In this study, we have discussed details about functional properties of plant endophytes and their mechanism for enhancing plant productivity and soil health and fertility management under climate-resilient agricultural practices. Our main objective is to promote and explore the beneficial plant endophytes for enhancing sustainable agricultural productivity.
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Chen H, Zhan Z, Jiang X, Qing Y, Yin Z, Mei L, Zhou D, Ni B, Zhang Y. Comparative genomic analyses of Inc pA1763-KPC plasmids. J Basic Microbiol 2021; 61:219-229. [PMID: 33555043 DOI: 10.1002/jobm.202000668] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 01/05/2021] [Accepted: 01/10/2021] [Indexed: 11/10/2022]
Abstract
Multi-replicon plasmids harboring the IncpA1763-KPC replicon together with other replicons are being increasingly reported among Enterobacteriaceae species. However, plasmids with single IncpA1763-KPC replicons are poorly studied as a different incompatibility (Inc) group, despite their rise in appearance in some strains. IncpA1763-KPC plasmids, pA1763-KPC, and p427113-2, from two clinical Klebsiella pneumoniae isolates were fully sequenced by high-throughput genome sequencing. Linear structural comparisons of IncpA1763-KPC backbone region were made between these two plasmids and six arbitrarily selected representative IncpA1763-KPC plasmids sequenced previously. A further detailed genomic comparison was carried out between plasmids pA1763-KPC, p427113-2, and pFB2.2, which show high homology across the backbone sequence to one another. Among all sequenced IncpA1763-KPC plasmids considered in this study, plasmids pA1763-KPC and p427113-2 showed the most complete IncpA1763-KPC backbones. These were composed of the IncpA1763-KPC replicon (repAIncpA1763-KPC and its iterons), the 5.6-kb IncpA1763-KPC -type maintenance region, the 27.7-kb IncFIIK -type maintenance region, and the 36.6-kb IncFIIK -type conjugal transfer regions. Compared with pA1763-KPC or p427113-2, the backbone regions of the other analyzed IncpA1763-KPC plasmids had gradually undergone different deletions or truncations, but shared small and core IncpA1763-KPC backbones including the IncpA1763-KPC replicon, IncpA1763-KPC -type maintenance region, and residual IncFIIK -type maintenance region. Accessory modules integrated into IncpA1763-KPC backbones included the multidrug-resistant module blaKPC-2 region in pA1763-KPC, the metal-resistance modules ars region together with ncr region in pFB2.2 and sil in pKPN-9a0d, the ISKpn14-to-IS26 region in p427113-2, and other non-resistance region in the respective plasmids. This detailed comparative genomics analysis of IncpA1763-KPC plasmids provides a deep insight into their diversification and evolution.
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Affiliation(s)
- Hongchao Chen
- College of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Zhe Zhan
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
| | - Xiaoyuan Jiang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
| | - Yang Qing
- College of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Zhe Yin
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
| | - Lingling Mei
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
| | - Dongsheng Zhou
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
| | - Bin Ni
- School of Medicine, Jiangsu University, Zhenjiang, China
| | - Yanjun Zhang
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
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Deciphering the Root Endosphere Microbiome of the Desert Plant Alhagi sparsifolia for Drought Resistance-Promoting Bacteria. Appl Environ Microbiol 2020; 86:AEM.02863-19. [PMID: 32220847 DOI: 10.1128/aem.02863-19] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 03/21/2020] [Indexed: 01/28/2023] Open
Abstract
Drought is among the most destructive abiotic stresses limiting crop growth and yield worldwide. Although most research has focused on the contribution of plant-associated microbial communities to plant growth and disease suppression, far less is known about the microbes involved in drought resistance among desert plants. In the present study, we applied 16S rRNA gene amplicon sequencing to determine the structure of rhizosphere and root endosphere microbiomes of Alhagi sparsifolia Compared to those of the rhizosphere, endosphere microbiomes had lower diversity but contained several taxa with higher relative abundance; many of these taxa were also present in the roots of other desert plants. We isolated a Pseudomonas strain (LTGT-11-2Z) that was prevalent in root endosphere microbiomes of A. sparsifolia and promoted drought resistance during incubation with wheat. Complete genome sequencing of LTGT-11-2Z revealed 1-aminocyclopropane-1-carboxylate deaminases, siderophore, spermidine, and colanic acid biosynthetic genes, as well as type VI secretion system (T6SS) genes, which are likely involved in biofilm formation and plant-microbe interactions. Together, these results indicate that drought-enduring plants harbor bacterial endophytes favorable to plant drought resistance, and they suggest that novel endophytic bacterial taxa and gene resources may be discovered among these desert plants.IMPORTANCE Understanding microbe-mediated plant resistance to drought is important for sustainable agriculture. We performed 16S rRNA gene amplicon sequencing and culture-dependent functional analyses of Alhagi sparsifolia rhizosphere and root endosphere microbiomes and identified key endophytic bacterial taxa and their genes facilitating drought resistance in wheat. This study improves our understanding of plant drought resistance and provides new avenues for drought resistance improvement in crop plants under field conditions.
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Tang T, Sun X, Dong Y, Liu Q. Erythrobacter aureus sp. nov., a plant growth-promoting bacterium isolated from sediment in the Yellow Sea, China. 3 Biotech 2019; 9:430. [PMID: 31696035 PMCID: PMC6823416 DOI: 10.1007/s13205-019-1958-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 10/14/2019] [Indexed: 01/03/2023] Open
Abstract
The application of plant growth-promoting (PGP) bacterium in agriculture is expanding rapidly in recent years. With the development of microbial technology, new bacterial species effective in promoting plant growth have been identified. In this study, a PGP bacterium was isolated from marine sediments of the Yellow Sea in China. The confrontation culture test and pot experiments showed that strain YH-07T inhibited the growth of Fusarium oxysporum f. sp. lycopersici (a plant pathogenic fungus), benefiting plant growth and reducing disease incidence of tomato wilt. We used polyphasic approaches including phenotypic, chemotaxonomic and phylogenetic information to determine its taxonomic status. In addition to profiling general features of the YH-07T genome, we identified genes related to PGP traits and genes involved in environmental stress tolerance. Metabolic assays showed that strain YH-07T could produce siderophores, solubilize phosphate, resist to salinity, and grow well within a wide range of temperature and pH, which is a promising PGP bacterium for future agricultural applications. These results provide evidence that strain YH-07T is a novel species of the genus Erythrobacter, for which the name Erythrobacter aureus sp. nov. is proposed. The type strain is YH-07T (= CGMCC 1.16784T = DSM 107319T).
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Affiliation(s)
- Tongtong Tang
- Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008 Jiangsu Province China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Xing Sun
- School of Biological Science and Food Engineering, Chuzhou University, Chuzhou, 239000 China
| | - Yuanhua Dong
- Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008 Jiangsu Province China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Qin Liu
- Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008 Jiangsu Province China
- University of Chinese Academy of Sciences, Beijing, 100049 China
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10
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Complete genome sequence of Caulobacter flavus RHGG3 T, a type species of the genus Caulobacter with plant growth-promoting traits and heavy metal resistance. 3 Biotech 2019; 9:42. [PMID: 30675452 DOI: 10.1007/s13205-019-1569-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 01/03/2019] [Indexed: 10/27/2022] Open
Abstract
Caulobacter flavus RHGG3T, a novel type species in the genus Caulobacter, originally isolated from rhizosphere soil of watermelon (Citrullus lanatus), has the ability to improve the growth of watermelon seedling and tolerate heavy metals. In vitro, C. flavus RHGG3T was able to solubilize phosphate (80.56 mg L-1), produce indole-3-acetic acid (IAA) (11.58 mg L-1) and was resistant to multiple heavy metals (copper, zinc, cadmium, cobalt and lead). Inoculating watermelon with this strain increased shoot and root length by 22.1% and 43.7%, respectively, and the total number of lateral roots by 55.9% compared to non-inoculated watermelon. In this study, we present the complete genome sequence of C. flavus RHGG3T, which was comprised of a single circular chromosome of 5,659,202 bp with a G + C content of 69.25%. An annotation analysis revealed that the C. flavus RHGG3T genome contained 5172 coding DNA sequences, 9 rRNA and 55 tRNA genes. Genes related to plant growth promotion (PGP), such as those associated with phosphate solubilization, nitrogen fixation, IAA, phenazine, volatile compounds, spermidine and cobalamin synthesis, were found in the C. flavus RHGG3T genome. Some genes responsible for heavy metal tolerance were also identified. The genome sequence of strain RHGG3T reported here provides new insight into the molecular mechanisms underlying the promotion of plant growth and the resistance to heavy metals in C. flavus. This study will be valuable for further exploration of the biotechnological applications of strain RHGG3T in agriculture.
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11
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Zhang Z, Yin L, Li X, Zhang C, Liu C, Wu Z. The complete genome sequence of Bacillus halotolerans ZB201702 isolated from a drought- and salt-stressed rhizosphere soil. Microb Pathog 2018; 123:246-249. [PMID: 30030140 DOI: 10.1016/j.micpath.2018.07.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 07/11/2018] [Accepted: 07/16/2018] [Indexed: 11/29/2022]
Abstract
Bacillus halotolerans is a rhizobacterium with the potential to promote plant growth and tolerance to drought and salinity stress. Here, we present the complete genome sequence of B. halotolerans ZB201702, which consists of 4,150,000 bp in a linear chromosome, including 3074 protein-coding sequences, 30 rRNAs, and 85 tRNAs. Genome analysis revealed many putative gene clusters involved in defense mechanisms. Activity analysis of the strain under salt and simulated drought stress suggests tolerance to abiotic stresses. The complete genome information of B. halotolerans ZB201702 could provide valuable insights into rhizobacteria-mediated plant salt and drought tolerance and rhizobacteria-based solutions for abiotic stress agriculture.
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Affiliation(s)
- Zhongbao Zhang
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing, 100097, China.
| | - Longfei Yin
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; College of Life Sciences, Capital Normal University, Beijing, 10048, China
| | - Xianglong Li
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing, 100097, China
| | - Chun Zhang
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing, 100097, China
| | - Cai Liu
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing, 100097, China
| | - Zhongyi Wu
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing, 100097, China.
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Wang TT, Ding P, Chen P, Xing K, Bai JL, Wan W, Jiang JH, Qin S. Complete genome sequence of endophyte Bacillus flexus KLBMP 4941 reveals its plant growth promotion mechanism and genetic basis for salt tolerance. J Biotechnol 2017; 260:38-41. [DOI: 10.1016/j.jbiotec.2017.09.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/01/2017] [Accepted: 09/02/2017] [Indexed: 12/16/2022]
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