1
|
Sorty AM, Zervas A, García de Salamone IE, Nelson LM, Stougaard P. Pseudomonas hormoni sp. nov., a plant hormone producing bacterium isolated from Arctic grass, Ellesmere Island, Canada. Int J Syst Evol Microbiol 2023; 73. [PMID: 37889848 DOI: 10.1099/ijsem.0.006119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/29/2023] Open
Abstract
Bacterial strain G20-18T was previously isolated from the rhizosphere of an Arctic grass on Ellesmere Island, Canada and was characterized and described as Pseudomonas fluorescens. However, new polyphasic analyses coupled with phenotypic, phylogenetic and genomic analyses reported here demonstrate that the affiliation to the species P. fluorescens was incorrect. The strain is Gram-stain-negative, rod-shaped, aerobic and displays growth at 5-25 °C (optimum, 20-25 °C), at pH 5-9 (optimum, pH 6-7) and with 0-4 % NaCl (optimum, 2 % NaCl). The major fatty acids are C16 : 0 (35.6 %), C17 : 0 cyclo ω7c (26.3 %) and summed feature C18 : 1/C18 : 1 ω7c (13.6 %). The respiratory quinones were determined to be Q9 (93.5 %) and Q8 (6.5 %) and the major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol. Strain G20-18T was shown to synthesize cytokinin and auxin plant hormones and to produce 1-aminocyclopropane-1-carboxylate deaminase. The DNA G+C content was determined to be 59.1 mol%. Phylogenetic analysis based on the 16S rRNA gene and multilocus sequence analysis (concatenated 16S rRNA, gyrB, rpoB and rpoD sequences) showed that G20-18T was affiliated with the Pseudomonas mandelii subgroup within the genus Pseudomonas. Comparisons of the G20-18T genome sequence and related Pseudomonas type strain sequences showed an average nucleotide identity value of ≤93.6 % and a digital DNA-DNA hybridization value of less than 54.4 % relatedness. The phenotypic, phylogenetic and genomic data support the hypothesis that strain G20-18T represents a novel species of the genus Pseudomonas. As strain G20-18T produces or modifies hormones, the name Pseudomonas hormoni sp. nov. is proposed. The type strain is G20-18T (=LMG 33086T=NCIMB 15469T).
Collapse
Affiliation(s)
| | - Athanasios Zervas
- Department of Environmental Science, Aarhus University, Roskilde, Denmark
| | | | - Louise M Nelson
- Biology Department, University of British Columbia, Vancouver, Canada
| | - Peter Stougaard
- Department of Environmental Science, Aarhus University, Roskilde, Denmark
| |
Collapse
|
2
|
Zboralski A, Filion M. Pseudomonas spp. can help plants face climate change. Front Microbiol 2023; 14:1198131. [PMID: 37426009 PMCID: PMC10326438 DOI: 10.3389/fmicb.2023.1198131] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023] Open
Abstract
Climate change is increasingly affecting agriculture through droughts, high salinity in soils, heatwaves, and floodings, which put intense pressure on crops. This results in yield losses, leading to food insecurity in the most affected regions. Multiple plant-beneficial bacteria belonging to the genus Pseudomonas have been shown to improve plant tolerance to these stresses. Various mechanisms are involved, including alteration of the plant ethylene levels, direct phytohormone production, emission of volatile organic compounds, reinforcement of the root apoplast barriers, and exopolysaccharide biosynthesis. In this review, we summarize the effects of climate change-induced stresses on plants and detail the mechanisms used by plant-beneficial Pseudomonas strains to alleviate them. Recommendations are made to promote targeted research on the stress-alleviating potential of these bacteria.
Collapse
|
3
|
Gupta R, Elkabetz D, Leibman-Markus M, Sayas T, Schneider A, Jami E, Kleiman M, Bar M. Cytokinin drives assembly of the phyllosphere microbiome and promotes disease resistance through structural and chemical cues. THE ISME JOURNAL 2022; 16:122-137. [PMID: 34272494 PMCID: PMC8692462 DOI: 10.1038/s41396-021-01060-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/24/2021] [Accepted: 07/05/2021] [Indexed: 02/06/2023]
Abstract
The plant hormone cytokinin (CK) is an important developmental regulator, promoting morphogenesis and delaying differentiation and senescence. From developmental processes, to growth, to stress tolerance, CKs are central in plant life. CKs are also known to mediate plant immunity and disease resistance, and several classes of microbes can also produce CKs, affecting the interaction with their plant hosts. While host species and genotype can be a driving force in shaping the plant microbiome, how plant developmental hormones such as CK can shape the microbiome is largely uninvestigated. Here, we examined the relationship between CK and the phyllosphere microbiome, finding that CK acts as a selective force in microbiome assembly, increasing richness, and promoting the presence of Firmicutes. CK-mediated immunity was found to partially depend on the microbial community, and bacilli isolated from previously described CK-rich plant genotypes, which overexpress a CK biosynthesis gene or have increased CK sensitivity, induced plant immunity, and promoted disease resistance. Using a biomimetic system, we investigated the relationship between the leaf microstructure, which is differentially patterned upon changes in CK content or signaling, and the growth of different phyllosphere microbes. We found that leaf structures derived from CK-rich plant genotypes support bacilli in the biomimetic system. CK was able to promote the growth, swarming, and biofilm formation of immunity inducing bacillus isolates in vitro. Overall, our results indicate that host genotype and hormonal profiles can act as a strong selective force in microbiome assembly, underlying differential immunity profiles, and pathogen resistance as a result.
Collapse
Affiliation(s)
- Rupali Gupta
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Dorin Elkabetz
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
- Department of Plant Pathology and Microbiology, Hebrew University of Jerusalem, Rehovot, Israel
| | - Meirav Leibman-Markus
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Tali Sayas
- Department of Vegetable and Field crops, Plant Sciences Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Anat Schneider
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
- Department of Plant Pathology and Microbiology, Hebrew University of Jerusalem, Rehovot, Israel
| | - Elie Jami
- Department of Ruminant Science, Animal Science Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Maya Kleiman
- Department of Vegetable and Field crops, Plant Sciences Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
- Agro-NanoTechnology and Advanced Materials Center, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel
| | - Maya Bar
- Department of Plant Pathology and Weed Research, Plant Protection Institute, Agricultural Research Organization, Volcani Institute, Rishon LeZion, Israel.
| |
Collapse
|
4
|
Visen A, Singh PN, Chakraborty B, Singh A, Bisht TS. Scanning electron microscopy indicates Pseudomonad strains facilitate AMF mycorrhization in litchi ( Litchi chinensis Sonn.) air-layers and improving survivability, growth and leaf nutrient status. CURRENT RESEARCH IN MICROBIAL SCIENCES 2021; 2:100063. [PMID: 34841353 PMCID: PMC8610343 DOI: 10.1016/j.crmicr.2021.100063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 08/10/2021] [Accepted: 08/18/2021] [Indexed: 11/06/2022] Open
Abstract
Co-inoculation of pseudomonad R62 and R81 (PGPR) with Glomus intraradices (AM fungi) was tested at two different stages of litchi air-layering technique. The process of mycorrhization was enhanced with co-inoculation of these pseudomonad strains. This co-inoculation treatment reduced the mortality and increased the growth of the litchi air-layers. The leaf primary (N, P, and K) and micro (Zn, Cu and Fe) nutrient status in the litchi air-layers were also improved under this co-inoculation treatment. Inoculation after detachment of the air-layers from the mother tree was more productive.
The efficacy of two plant growth promoting rhizobacteria (PGPR) viz. Pseudomonas jessenni strain R62 and Pseudomonas synxantha strain R81 was examined for mycorrhization of arbuscular mycorrhizal (AM) fungi (Glomus intraradices), survivability, growth and leaf nutrient status in litchi air-layer system. Therefore, the litchi air-layers were inoculated with PGPR i.e., Pseudomonad strains and AM fungi alone and with combination during the preparation of air-layers on the mother tree and planting of air-layers in root trainers just after detachment of the fresh air-layers from the mother tree. The scanning electron microscopy of the litchi roots indicated that Pseudomonad strains enhanced the process of mycorrhization of AM fungi and accounted near about 11.5 (tree inoculation) to 14.5 (root trainer inoculation) per cent increase in colonization over the sole inoculation of AM fungi in respective air-layers. No sign of mortality in any air-layered plants was noted in PGPR + AM fungi and sole AM fungi inoculated air-layers up to 18 months of growing. Significantly the highest shoot and root dry weight, and root length were recorded in the air-layers inoculated with both PGPR and AM fungi. This co-inoculation of PGPR with AM fungi was also responsible for the significant enrichment of the primary (N, P and K) and micro (Zn, Cu and Fe) nutrient concentration of the leaves in the litchi air-layers. However, the inoculation of air-layers with these microorganisms failed to produce any significant effects on leaf secondary (Ca, Mg and S) nutrient content. Further, the inoculation treatments had an adverse impact on leaf Mn content. The fresh air-layers inoculated after detachment from the mother tree were performed better for most of the studied parameters than the tree inoculated air-layers.
Collapse
Affiliation(s)
- Amit Visen
- Department of Horticulture, College of Agriculture, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar- 263 145, Udham Singh Nagar, Uttarakhand, India.,Subject Matter Specialist (Horticulture), Krishi Vigyan Kendra, Dr. Rajendra Prasad Central Agricultural University, Sipaya, Gopalganj, 841 501, Bihar, India
| | - Pramodh Narayan Singh
- Department of Horticulture, College of Agriculture, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar- 263 145, Udham Singh Nagar, Uttarakhand, India
| | - Binayak Chakraborty
- Regional Research Station (Terai Zone), Uttar Banga Krishi Viswavidyalaya, P.O.: Pundibari- 736 165, Coochbehar, WB, India
| | - Anand Singh
- Department of Horticulture, Janta College, C.S.J.M. University, Bakewar, Etawah 206 124, Uttar Pradesh, India
| | - Tejpal Singh Bisht
- Department of Horticulture, Chauras Campus, Hemvati Nandan Bahuguna Garhwal University, Srinagar-Garhwal- 246 174, Uttarakhand, India
| |
Collapse
|
5
|
Vick SHW, Fabian BK, Dawson CJ, Foster C, Asher A, Hassan KA, Midgley DJ, Paulsen IT, Tetu SG. Delving into defence: identifying the Pseudomonas protegens Pf-5 gene suite involved in defence against secreted products of fungal, oomycete and bacterial rhizosphere competitors. Microb Genom 2021; 7. [PMID: 34788213 PMCID: PMC8743541 DOI: 10.1099/mgen.0.000671] [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] [Indexed: 01/12/2023] Open
Abstract
Competitive behaviours of plant growth promoting rhizobacteria (PGPR) are integral to their ability to colonize and persist on plant roots and outcompete phytopathogenic fungi, oomycetes and bacteria. PGPR engage in a range of antagonistic behaviours that have been studied in detail, such as the production and secretion of compounds inhibitory to other microbes. In contrast, their defensive activities that enable them to tolerate exposure to inhibitory compounds produced by their neighbours are less well understood. In this study, the genes involved in the Pseudomonas protegens Pf-5 response to metabolites from eight diverse rhizosphere competitor organisms, Fusarium oxysporum, Rhizoctonia solani, Gaeumannomyces graminis var. tritici, Pythium spinosum, Bacillus subtilis QST713, Pseudomonas sp. Q2-87, Streptomyces griseus and Streptomyces bikiniensis subspecies bikiniensi, were examined. Proximity induced excreted metabolite responses were confirmed for Pf-5 with all partner organisms through HPLC before culturing a dense Pf-5 transposon mutant library adjacent to each of these microbes. This was followed by transposon-directed insertion site sequencing (TraDIS), which identified genes that influence Pf-5 fitness during these competitive interactions. A set of 148 genes was identified that were associated with increased fitness during competition, including cell surface modification, electron transport, nucleotide metabolism, as well as regulatory genes. In addition, 51 genes were identified for which loss of function resulted in fitness gains during competition. These included genes involved in flagella biosynthesis and cell division. Considerable overlap was observed in the set of genes observed to provide a fitness benefit during competition with all eight test organisms, indicating commonalities in the competitive response to phylogenetically diverse micro-organisms and providing new insight into competitive processes likely to take place in the rhizosphere.
Collapse
Affiliation(s)
- Silas H W Vick
- Department of Molecular Sciences, Macquarie University, North Ryde, Australia.,Commonwealth Scientific and Industrial Research Organisation (CSIRO), North Ryde, Australia.,Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, Norway
| | - Belinda K Fabian
- Department of Molecular Sciences, Macquarie University, North Ryde, Australia.,ARC Centre of Excellence in Synthetic Biology, Macquarie University, North Ryde, Australia
| | - Catherine J Dawson
- School of Environmental and Life Sciences, University of Newcastle, Newcastle, Australia
| | - Christie Foster
- Department of Molecular Sciences, Macquarie University, North Ryde, Australia
| | - Amy Asher
- Department of Molecular Sciences, Macquarie University, North Ryde, Australia
| | - Karl A Hassan
- School of Environmental and Life Sciences, University of Newcastle, Newcastle, Australia
| | - David J Midgley
- Commonwealth Scientific and Industrial Research Organisation (CSIRO), North Ryde, Australia
| | - Ian T Paulsen
- Department of Molecular Sciences, Macquarie University, North Ryde, Australia.,ARC Centre of Excellence in Synthetic Biology, Macquarie University, North Ryde, Australia
| | - Sasha G Tetu
- Department of Molecular Sciences, Macquarie University, North Ryde, Australia.,ARC Centre of Excellence in Synthetic Biology, Macquarie University, North Ryde, Australia
| |
Collapse
|
6
|
Nguyen HN, Nguyen TQ, Kisiala AB, Emery RJN. Beyond transport: cytokinin ribosides are translocated and active in regulating the development and environmental responses of plants. PLANTA 2021; 254:45. [PMID: 34365553 DOI: 10.1007/s00425-021-03693-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 08/01/2021] [Indexed: 06/13/2023]
Abstract
Riboside type cytokinins are key components in cytokinin metabolism, transport, and sensitivity, making them important functional signals in plant growth and development and environmental stress responses. Cytokinin (CKs) are phytohormones that regulate multiple processes in plants and are critical for agronomy, as they are involved in seed filling and plant responses to biotic and abiotic stress. Among the over 30 identified CKs, there is uncertainty about the roles of many of the individual CK structural forms. Cytokinin free bases (CKFBs), have been studied in great detail, but, by comparison, roles of riboside-type CKs (CKRs) in CK metabolism and associated signaling pathways and their distal impacts on plant physiology remain largely unknown. Here, recent findings on CKR abundance, transport and localization, are summarized, and their importance in planta is discussed. The history of CKR analyses is reviewed, in the context of the determination of CK metabolic pathways, and research on CKR affinity for CK receptors, all of which yield essential insights into their functions. Recent studies suggest that CKR forms are a lot more than a group of transport CKs and, beyond this, they play important roles in plant development and responses to environmental stress. In this context, this review discusses the involvement of CKRs in plant development, and highlight the less anticipated functions of CKRs in abiotic stress tolerance. Based on this, possible mechanisms for CKR modes of action are proposed and experimental approaches to further uncover their roles and future biotechnological applications are suggested.
Collapse
Affiliation(s)
- Hai Ngoc Nguyen
- Department of Biology, Trent University, Peterborough, ON, K9L 0G2, Canada.
| | - Thien Quoc Nguyen
- Department of Biology, Trent University, Peterborough, ON, K9L 0G2, Canada
| | - Anna B Kisiala
- Department of Biology, Trent University, Peterborough, ON, K9L 0G2, Canada
| | - R J Neil Emery
- Department of Biology, Trent University, Peterborough, ON, K9L 0G2, Canada
| |
Collapse
|
7
|
Complete Genome Sequence of the Cytokinin-Producing Biocontrol Strain Pseudomonas fluorescens G20-18. Microbiol Resour Announc 2021; 10:e0060121. [PMID: 34323599 PMCID: PMC8320453 DOI: 10.1128/mra.00601-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Here, we report the complete genome sequence of the cytokinin-producing plant growth-promoting strain Pseudomonas fluorescens G20-18. The complete genome assembly resulted in a single, circular chromosome of 6.48 Mbp and harbors several secondary metabolite biosynthesis gene clusters that are potentially involved in its plant growth-promoting function.
Collapse
|
8
|
Water Conservation and Plant Survival Strategies of Rhizobacteria under Drought Stress. AGRONOMY-BASEL 2020. [DOI: 10.3390/agronomy10111683] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Drylands are stressful environment for plants growth and production. Plant growth-promoting rhizobacteria (PGPR) acts as a rampart against the adverse impacts of drought stress in drylands and enhances plant growth and is helpful in agricultural sustainability. PGPR improves drought tolerance by implicating physio-chemical modifications called rhizobacterial-induced drought endurance and resilience (RIDER). The RIDER response includes; alterations of phytohormonal levels, metabolic adjustments, production of bacterial exopolysaccharides (EPS), biofilm formation, and antioxidant resistance, including the accumulation of many suitable organic solutes such as carbohydrates, amino acids, and polyamines. Modulation of moisture status by these PGPRs is one of the primary mechanisms regulating plant growth, but studies on their effect on plant survival are scarce in sandy/desert soil. It was found that inoculated plants showed high tolerance to water-deficient conditions by delaying dehydration and maintaining the plant’s water status at an optimal level. PGPR inoculated plants had a high recovery rate after rewatering interms of similar biomass at flowering compared to non-stressed plants. These rhizobacteria enhance plant tolerance and also elicit induced systemic resistance of plants to water scarcity. PGPR also improves the root growth and root architecture, thereby improving nutrient and water uptake. PGPR promoted accumulation of stress-responsive plant metabolites such as amino acids, sugars, and sugar alcohols. These metabolites play a substantial role in regulating plant growth and development and strengthen the plant’s defensive system against various biotic and abiotic stresses, in particular drought stress.
Collapse
|
9
|
Bhat MA, Kumar V, Bhat MA, Wani IA, Dar FL, Farooq I, Bhatti F, Koser R, Rahman S, Jan AT. Mechanistic Insights of the Interaction of Plant Growth-Promoting Rhizobacteria (PGPR) With Plant Roots Toward Enhancing Plant Productivity by Alleviating Salinity Stress. Front Microbiol 2020; 11:1952. [PMID: 32973708 PMCID: PMC7468593 DOI: 10.3389/fmicb.2020.01952] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/24/2020] [Indexed: 11/20/2022] Open
Abstract
Agriculture plays an important role in a country's economy. The sector is challenged by many stresses, which led to huge loss in plant productivity worldwide. The ever-increasing population, rapid urbanization with shrinking agricultural lands, dramatic change in climatic conditions, and extensive use of agrochemicals in agricultural practices that caused environmental disturbances confront mankind of escalating problems of food security and sustainability in agriculture. Escalating environmental problems and global hunger have led to the development and adoption of genetic engineering and other conventional plant breeding approaches in developing stress-tolerant varieties of crops. However, these approaches have drawn flaws in their adoption as the process of generating tolerant varieties takes months to years in bringing the technology from the lab to the field. Under such scenario, sustainable and climate-smart agricultural practices that avail bacterial usage open the avenues in fulfilling the incessant demand for food for the global population. Ensuring stability on economic fronts, bacteria minimizes plant salt uptake by trapping ions in their exopolysaccharide matrix besides checking the expression of Na+/H+ and high-affinity potassium transporters. Herein we describe information on salinity stress and its effect on plant health as well as strategies adopted by plant growth-promoting rhizobacteria (PGPR) in helping plants to overcome salinity stress and in mitigating loss in overall plant productivity. It is believed that acquisition of advanced knowledge of plant-beneficial PGPR will help in devising strategies for sustainable, environment-friendly, and climate-smart agricultural technologies for adoption in agriculture to overcome the constrained environmental conditions.
Collapse
Affiliation(s)
- Mujtaba Aamir Bhat
- Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Vijay Kumar
- Department of Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Mudasir Ahmad Bhat
- Department of Biotechnology, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Ishfaq Ahmad Wani
- Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Farhana Latief Dar
- Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Iqra Farooq
- Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Farha Bhatti
- Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Rubina Koser
- Department of Microbiology, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | - Safikur Rahman
- Department of Botany, Munshi Singh College, Babasaheb Bhimrao Ambedkar Bihar University, Muzaffarpur, India
| | - Arif Tasleem Jan
- Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| |
Collapse
|
10
|
Taye ZM, Helgason BL, Bell JK, Norris CE, Vail S, Robinson SJ, Parkin IAP, Arcand M, Mamet S, Links MG, Dowhy T, Siciliano S, Lamb EG. Core and Differentially Abundant Bacterial Taxa in the Rhizosphere of Field Grown Brassica napus Genotypes: Implications for Canola Breeding. Front Microbiol 2020; 10:3007. [PMID: 32010086 PMCID: PMC6974584 DOI: 10.3389/fmicb.2019.03007] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 12/13/2019] [Indexed: 12/18/2022] Open
Abstract
Modifying the rhizosphere microbiome through targeted plant breeding is key to harnessing positive plant-microbial interrelationships in cropping agroecosystems. Here, we examine the composition of rhizosphere bacterial communities of diverse Brassica napus genotypes to identify: (1) taxa that preferentially associate with genotypes, (2) core bacterial microbiota associated with B. napus, (3) heritable alpha diversity measures at flowering and whole growing season, and (4) correlation between microbial and plant genetic distance among canola genotypes at different growth stages. Our aim is to identify and describe signature microbiota with potential positive benefits that could be integrated in B. napus breeding and management strategies. Rhizosphere soils of 16 diverse genotypes sampled weekly over a 10-week period at single location as well as at three time points at two additional locations were analyzed using 16S rRNA gene amplicon sequencing. The B. napus rhizosphere microbiome was characterized by diverse bacterial communities with 32 named bacterial phyla. The most abundant phyla were Proteobacteria, Actinobacteria, and Acidobacteria. Overall microbial and plant genetic distances were highly correlated (R = 0.65). Alpha diversity heritability estimates were between 0.16 and 0.41 when evaluated across growth stage and between 0.24 and 0.59 at flowering. Compared with a reference B. napus genotype, a total of 81 genera were significantly more abundant and 71 were significantly less abundant in at least one B. napus genotype out of the total 558 bacterial genera. Most differentially abundant genera were Proteobacteria and Actinobacteria followed by Bacteroidetes and Firmicutes. Here, we also show that B. napus genotypes select an overall core bacterial microbiome with growth-stage-related patterns as to how taxa joined the core membership. In addition, we report that sets of B. napus core taxa were consistent across our three sites and 2 years. Both differential abundance and core analysis implicate numerous bacteria that have been reported to have beneficial effects on plant growth including disease suppression, antifungal properties, and plant growth promotion. Using a multi-site year, temporally intensive field sampling approach, we showed that small plant genetic differences cause predictable changes in canola microbiome and are potential target for direct and indirect selection within breeding programs.
Collapse
Affiliation(s)
- Zelalem M. Taye
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Bobbi L. Helgason
- Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Jennifer K. Bell
- Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Charlotte E. Norris
- Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Sally Vail
- Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, Canada
| | - Stephen J. Robinson
- Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, Canada
| | - Isobel A. P. Parkin
- Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, Canada
| | - Melissa Arcand
- Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Steven Mamet
- Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Matthew G. Links
- Department of Computer Science, College of Arts and Science, University of Saskatchewan, Saskatoon, SK, Canada
- Department of Animal and Poultry Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | - Tanner Dowhy
- Department of Computer Science, College of Arts and Science, University of Saskatchewan, Saskatoon, SK, Canada
| | - Steven Siciliano
- Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK, Canada
| | - Eric G. Lamb
- Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| |
Collapse
|
11
|
Lucke M, Correa MG, Levy A. The Role of Secretion Systems, Effectors, and Secondary Metabolites of Beneficial Rhizobacteria in Interactions With Plants and Microbes. FRONTIERS IN PLANT SCIENCE 2020; 11:589416. [PMID: 33240304 PMCID: PMC7680756 DOI: 10.3389/fpls.2020.589416] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 10/14/2020] [Indexed: 05/05/2023]
Abstract
Beneficial rhizobacteria dwell in plant roots and promote plant growth, development, and resistance to various stress types. In recent years there have been large-scale efforts to culture root-associated bacteria and sequence their genomes to uncover novel beneficial microbes. However, only a few strains of rhizobacteria from the large pool of soil microbes have been studied at the molecular level. This review focuses on the molecular basis underlying the phenotypes of three beneficial microbe groups; (1) plant-growth promoting rhizobacteria (PGPR), (2) root nodulating bacteria (RNB), and (3) biocontrol agents (BCAs). We focus on bacterial proteins and secondary metabolites that mediate known phenotypes within and around plants, and the mechanisms used to secrete these. We highlight the necessity for a better understanding of bacterial genes responsible for beneficial plant traits, which can be used for targeted gene-centered and molecule-centered discovery and deployment of novel beneficial rhizobacteria.
Collapse
|
12
|
Luo D, Langendries S, Mendez SG, De Ryck J, Liu D, Beirinckx S, Willems A, Russinova E, Debode J, Goormachtig S. Plant Growth Promotion Driven by a Novel Caulobacter Strain. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2019; 32:1162-1174. [PMID: 30933667 DOI: 10.1094/mpmi-12-18-0347-r] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Soil microbial communities hold great potential for sustainable and ecologically compatible agriculture. Although numerous plant-beneficial bacterial strains from a wide range of taxonomic groups have been reported, very little evidence is available on the plant-beneficial role of bacteria from the genus Caulobacter. Here, the mode of action of a Caulobacter strain, designated RHG1, which had originally been identified through a microbial screen for plant growth-promoting (PGP) bacteria in maize (Zea mays), is investigated in Arabidopsis thaliana. RHG1 colonized both roots and shoots of Arabidopsis, promoted lateral root formation in the root, and increased leaf number and leaf size in the shoot. The genome of RHG1 was sequenced and was utilized to look for PGP factors. Our data revealed that the bacterial production of nitric oxide, auxins, cytokinins, or 1-aminocyclopropane-1-carboxylate deaminase as PGP factors could be excluded. However, the analysis of brassinosteroid mutants suggests that an unknown PGP mechanism is involved that impinges directly or indirectly on the pathway of this growth hormone.
Collapse
Affiliation(s)
- Dexian Luo
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Sarah Langendries
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Sonia Garcia Mendez
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
- Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, 9000 Ghent, Belgium
| | - Joren De Ryck
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Derui Liu
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Stien Beirinckx
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), 9820 Merelbeke, Belgium
| | - Anne Willems
- Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, 9000 Ghent, Belgium
| | - Eugenia Russinova
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Jane Debode
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), 9820 Merelbeke, Belgium
| | - Sofie Goormachtig
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| |
Collapse
|
13
|
Bhise KK, Dandge PB. Mitigation of salinity stress in plants using plant growth promoting bacteria. Symbiosis 2019. [DOI: 10.1007/s13199-019-00638-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
14
|
Etesami H, Beattie GA. Mining Halophytes for Plant Growth-Promoting Halotolerant Bacteria to Enhance the Salinity Tolerance of Non-halophytic Crops. Front Microbiol 2018; 9:148. [PMID: 29472908 PMCID: PMC5809494 DOI: 10.3389/fmicb.2018.00148] [Citation(s) in RCA: 139] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 01/23/2018] [Indexed: 11/20/2022] Open
Abstract
Salinity stress is one of the major abiotic stresses limiting crop production in arid and semi-arid regions. Interest is increasing in the application of PGPRs (plant growth promoting rhizobacteria) to ameliorate stresses such as salinity stress in crop production. The identification of salt-tolerant, or halophilic, PGPRs has the potential to promote saline soil-based agriculture. Halophytes are a useful reservoir of halotolerant bacteria with plant growth-promoting capabilities. Here, we review recent studies on the use of halophilic PGPRs to stimulate plant growth and increase the tolerance of non-halophytic crops to salinity. These studies illustrate that halophilic PGPRs from the rhizosphere of halophytic species can be effective bio-inoculants for promoting the production of non-halophytic species in saline soils. These studies support the viability of bioinoculation with halophilic PGPRs as a strategy for the sustainable enhancement of non-halophytic crop growth. The potential of this strategy is discussed within the context of ensuring sustainable food production for a world with an increasing population and continuing climate change. We also explore future research needs for using halotolerant PGPRs under salinity stress.
Collapse
Affiliation(s)
- Hassan Etesami
- Department of Soil Science, Faculty of Agricultural Engineering & Technology, University of Tehran, Tehran, Iran
| | - Gwyn A. Beattie
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA, United States
| |
Collapse
|
15
|
|
16
|
Rekha K, Baskar B, Srinath S, Usha B. Plant-growth-promoting rhizobacteria Bacillus subtilis RR4 isolated from rice rhizosphere induces malic acid biosynthesis in rice roots. Can J Microbiol 2017; 64:20-27. [PMID: 29045801 DOI: 10.1139/cjm-2017-0409] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Malic acid (MA), one of the major organic acid exudates from roots, plays a significant role in the chemotaxis of beneficial bacteria to the plant's rhizosphere. In this study, the effect of a plant-growth-promoting rhizobacterium, Bacillus subtilis RR4, on the synthesis and exudation of MA from roots is demonstrated in rice. To test the chemotactic ability of strain RR4 towards MA, a capillary chemotaxis assay was performed, which revealed a positive response (relative chemotactic ratio of 6.15 with 10 μmol/L MA); with increasing concentrations of MA, an elevated chemotactic response was observed. Quantitative polymerase chain reaction, performed to analyze the influence of RR4 on the MA biosynthetic gene, malate synthase (OsMS), and the transporter gene, aluminium-activated malate transporter (OsALMT), demonstrated significant differential expression, with 1.8- and -0.58-fold changes, respectively, in RR4-treated roots. The gene expression pattern of OsMS corroborated the data obtained by high-performance liquid chromatography, which showed elevated MA levels in roots (1.52-fold), whereas the levels of MA in root exudates were not altered significantly although expression of OsALMT was reduced. Our results demonstrate that B. subtilis RR4 is chemotactic to MA and can induce biosynthesis of MA in rice roots.
Collapse
Affiliation(s)
- Kandaswamy Rekha
- a Department of Genetic Engineering, SRM University, Kattankulathur, Tamil Nadu 603 203, India
| | - Baburaj Baskar
- b Department of Chemistry, SRM University, Kattankulathur, Tamil Nadu 603 203, India
| | - Santhanam Srinath
- b Department of Chemistry, SRM University, Kattankulathur, Tamil Nadu 603 203, India
| | - Balasundaram Usha
- a Department of Genetic Engineering, SRM University, Kattankulathur, Tamil Nadu 603 203, India
| |
Collapse
|
17
|
Pavlova AS, Leontieva MR, Smirnova TA, Kolomeitseva GL, Netrusov AI, Tsavkelova EA. Colonization strategy of the endophytic plant growth-promoting strains of Pseudomonas fluorescens and Klebsiella oxytoca on the seeds, seedlings and roots of the epiphytic orchid, Dendrobium nobile Lindl. J Appl Microbiol 2017; 123:217-232. [PMID: 28457004 DOI: 10.1111/jam.13481] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 04/17/2017] [Accepted: 04/24/2017] [Indexed: 11/26/2022]
Abstract
AIMS Orchids form strong mycorrhizal associations, but their interactions with bacteria are poorly understood. We aimed to investigate the distribution of plant growth promoting rhizobacteria (PGPR) at different stages of orchid development and to study if there is any selective specificity in choosing PGPR partners. METHODS AND RESULTS Colonization patterns of gfp-tagged Pseudomonas fluorescens and Klebsiella oxytoca were studied on roots, seeds, and seedlings of Dendrobium nobile. Endophytic rhizobacteria rapidly colonized velamen and core parenchyma entering through exodermis and the passage cells, whereas at the early stages, they stayed restricted to the surface and the outer layers of the protocorms and rhizoids. The highest amounts of auxin (indole-3-acetic acid) were produced by K. oxytoca and P. fluorescens in the nitrogen-limiting and NO3 -containing media respectively. Bacterization of D. nobile seeds resulted in promotion of their in vitro germination. The plant showed no selective specificity to the tested strains. Klebsiella oxytoca demonstrated more intense colonization activity and more efficient growth promoting impact under tryptophan supplementation, while P. fluorescens revealed its growth-promoting capacity without tryptophan. CONCLUSIONS Both strategies are regarded as complementary, improving adaptive potentials of the orchid when different microbial populations colonize the plant. SIGNIFICANCE AND IMPACT OF THE STUDY This study enlarges our knowledge on orchid-microbial interactions, and provides new features on application of the nonorchid PGPR in orchid seed germination and conservation.
Collapse
Affiliation(s)
- A S Pavlova
- Department of Microbiology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - M R Leontieva
- Department of Microbiology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - T A Smirnova
- Department of Cell Biology and Histology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - G L Kolomeitseva
- The Stock Greenhouse, Tsitsin Main Botanical Garden, Russian Academy of Sciences, Moscow, Russia
| | - A I Netrusov
- Department of Microbiology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | - E A Tsavkelova
- Department of Microbiology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| |
Collapse
|
18
|
Relationships observed between Trichoderma inoculation and characteristics of rice grown under System of Rice Intensification (SRI) vs. conventional methods of cultivation. Symbiosis 2016. [DOI: 10.1007/s13199-016-0438-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
19
|
Großkinsky DK, Tafner R, Moreno MV, Stenglein SA, García de Salamone IE, Nelson LM, Novák O, Strnad M, van der Graaff E, Roitsch T. Cytokinin production by Pseudomonas fluorescens G20-18 determines biocontrol activity against Pseudomonas syringae in Arabidopsis. Sci Rep 2016; 6:23310. [PMID: 26984671 PMCID: PMC4794740 DOI: 10.1038/srep23310] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 03/04/2016] [Indexed: 12/16/2022] Open
Abstract
Plant beneficial microbes mediate biocontrol of diseases by interfering with pathogens or via strengthening the host. Although phytohormones, including cytokinins, are known to regulate plant development and physiology as well as plant immunity, their production by microorganisms has not been considered as a biocontrol mechanism. Here we identify the ability of Pseudomonas fluorescens G20-18 to efficiently control P. syringae infection in Arabidopsis, allowing maintenance of tissue integrity and ultimately biomass yield. Microbial cytokinin production was identified as a key determinant for this biocontrol effect on the hemibiotrophic bacterial pathogen. While cytokinin-deficient loss-of-function mutants of G20-18 exhibit impaired biocontrol, functional complementation with cytokinin biosynthetic genes restores cytokinin-mediated biocontrol, which is correlated with differential cytokinin levels in planta. Arabidopsis mutant analyses revealed the necessity of functional plant cytokinin perception and salicylic acid-dependent defence signalling for this biocontrol mechanism. These results demonstrate microbial cytokinin production as a novel microbe-based, hormone-mediated concept of biocontrol. This mechanism provides a basis to potentially develop novel, integrated plant protection strategies combining promotion of growth, a favourable physiological status and activation of fine-tuned direct defence and abiotic stress resilience.
Collapse
Affiliation(s)
- Dominik K Großkinsky
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark.,Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria
| | - Richard Tafner
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria
| | - María V Moreno
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria.,Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CICBA-INBIOTEC-CONICET, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina.,Cátedra de Microbiología, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina
| | - Sebastian A Stenglein
- Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria.,Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CICBA-INBIOTEC-CONICET, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina.,Cátedra de Microbiología, Facultad de Agronomía de Azul-UNCPBA, Av. República de Italia 780, 7300 Azul, Buenos Aires, Argentina
| | - Inés E García de Salamone
- Cátedra de Microbiología Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Buenos Aires 1417, Argentina
| | - Louise M Nelson
- Department of Biology, Irving K Barber School of Arts and Sciences, University of British Columbia Okanagan Campus, 3333 University Way, Kelowna, BC V1V 1V7, Canada
| | - Ondřej Novák
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR &Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Miroslav Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR &Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Eric van der Graaff
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark.,Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria
| | - Thomas Roitsch
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark.,Department of Plant Physiology, Institute of Plant Sciences, University of Graz, Schubertstraße 51, 8010 Graz, Austria.,Global Change Research Centre, Czech Globe AS CR, v.v.i., Drásov 470, Cz-664 24 Drásov, Czech Republic
| |
Collapse
|
20
|
Haney CH, Samuel BS, Bush J, Ausubel FM. Associations with rhizosphere bacteria can confer an adaptive advantage to plants. NATURE PLANTS 2015; 1:15051. [PMID: 27019743 PMCID: PMC4806546 DOI: 10.1038/nplants.2015.51] [Citation(s) in RCA: 205] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 03/24/2015] [Indexed: 05/18/2023]
Abstract
Host-associated microbiomes influence host health. However, it is unclear whether genotypic variations in host organisms influence the microbiome in ways that have adaptive consequences for the host. Here, we show that wild accessions of Arabidopsis thaliana differ in their ability to associate with the root-associated bacterium Pseudomonas fluorescens, with consequences for plant fitness. In a screen of 196 naturally occurring Arabidopsis accessions we identified lines that actively suppress Pseudomonas growth under gnotobiotic conditions. We planted accessions that support disparate levels of fluorescent Pseudomonads in natural soils; 16S ribosomal RNA sequencing revealed that accession-specific differences in the microbial communities were largely limited to a subset of Pseudomonadaceae species. These accession-specific differences in Pseudomonas growth resulted in enhanced or impaired fitness that depended on the host's ability to support Pseudomonas growth, the specific Pseudomonas strains present in the soil and the nature of the stress. We suggest that small host-mediated changes in a microbiome can have large effects on host health.
Collapse
Affiliation(s)
- Cara H. Haney
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114, USA
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA
| | - Buck S. Samuel
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114, USA
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA
| | - Jenifer Bush
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA
| | - Frederick M. Ausubel
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114, USA
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA
- Correspondence and requests for materials should be addressed to F.M.A.
| |
Collapse
|
21
|
Maheshwari DK, Dheeman S, Agarwal M. Phytohormone-Producing PGPR for Sustainable Agriculture. BACTERIAL METABOLITES IN SUSTAINABLE AGROECOSYSTEM 2015. [DOI: 10.1007/978-3-319-24654-3_7] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|