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Root nodule bacteria

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https://www.readbyqxmd.com/read/29117917/antagonistic-endophytic-bacteria-associated-with-nodules-of-soybean-glycine-max-l-and-plant-growth-promoting-properties
#1
LongFei Zhao, YaJun Xu, XinHe Lai
A total of 276 endophytic bacteria were isolated from the root nodules of soybean (Glycine max L.) grown in 14 sites in Henan Province, China. The inhibitory activity of these bacteria against pathogenic fungus Phytophthora sojae 01 was screened in vitro. Six strains with more than 63% inhibitory activities were further characterized through optical epifluorescence microscopic observation, sequencing, and phylogenetic analysis of 16S rRNA gene, potential plant growth-promoting properties analysis, and plant inoculation assay...
October 13, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/29105533/plant-immunity-and-symbiosis-signaling-mediated-by-lysm-receptors
#2
Yoshitake Desaki, Kana Miyata, Maruya Suzuki, Naoto Shibuya, Hanae Kaku
Plants possess the ability to recognize microbe-associated molecular patterns (MAMPs) and PAMPs through the PRRs, and initiate pattern-triggered immunity. MAMPs are derived from cell-envelope components, secreted materials and cytosolic proteins from bacteria, oomycetes or fungi, and some MAMPs play a similar function in the innate immunity in mammals. Chitin is a representative fungal MAMP and triggers defense signaling in a wide range of plant species. The chitin receptors CEBiP and CERK1 on the plasma membrane have LysM (lysin motif) in their ectodomains...
January 1, 2017: Innate Immunity
https://www.readbyqxmd.com/read/29102065/molecular-phylogeny-of-bradyrhizobium-bacteria-isolated-from-root-nodules-of-tribe-genisteae-plants-growing-in-southeast-poland
#3
Michał Kalita, Wanda Małek
The phylogeny of 16 isolates from root nodules of Genista germanica, Genista tinctoria, Cytisus ratisbonensis, and Cytisus scoparius growing in southeast Poland was estimated by comparative sequence analysis of core (16S rDNA, atpD, glnII, recA) and symbiosis-related (nodC, nodZ, nifH) genes. All the sequences analyzed placed the studied rhizobia in the genus Bradyrhizobium. Phylogenetic analysis of individual and concatenated housekeeping genes showed that the Genisteae microsymbionts form a homogeneous group with Bradyrhizobium japonicum strains...
October 16, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/29062319/a-biosensor-based-leaf-punch-assay-for-glutamine-correlates-to-symbiotic-nitrogen-fixation-measurements-in-legumes-to-permit-rapid-screening-of-rhizobia-inoculants-under-controlled-conditions
#4
Malinda S Thilakarathna, Nicholas Moroz, Manish N Raizada
Legumes are protein sources for billions of humans and livestock. These traits are enabled by symbiotic nitrogen fixation (SNF), whereby root nodule-inhabiting rhizobia bacteria convert atmospheric nitrogen (N) into usable N. Unfortunately, SNF rates in legume crops suffer from undiagnosed incompatible/suboptimal interactions between crop varieties and rhizobia strains. There are opportunities to test much large numbers of rhizobia strains if cost/labor-effective diagnostic tests become available which may especially benefit researchers in developing countries...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29046420/della1-gibberellin-signaling-regulates-cytokinin-dependent-symbiotic-nodulation
#5
Camille Fonouni-Farde, Anna Kisiala, Mathias Brault, R J Neil Emery, Anouck Diet, Florian Frugier
In legume plants, low nitrogen soils promote symbiotic interactions with rhizobial bacteria, leading to the formation of nitrogen-fixing root nodules. Amongst critical signals regulating this developmental process are bacterial Nod Factors (NFs) and several plant hormones, including cytokinins (CKs) and gibberellins (GAs). Here we show in Medicago truncatula that GA signaling mediated by DELLA1 decreases the amount of bioactive CKs in roots and negatively impacts the CRE1 (Cytokinin Response 1)-dependent NF activation of a subset of CK-signaling genes, as well as of the CK-regulated NSP2 (Nodulation Signaling pathway 2) and ERN1 (ERF required for Nodulation) early nodulation genes...
October 18, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29034855/bradyrhizobium-namibiense-sp-nov-a-symbiotic-nitrogen-fixing-bacterium-from-root-nodules-of-lablab-purpureus-hyacinth-bean-in-namibia
#6
Jann Lasse Grönemeyer, Wiebke Bünger, Barbara Reinhold-Hurek
Four strains of symbiotic bacteria from root nodules of hyacinth bean (Lablab purpureus (L.) Sweet) from Namibia were previously identified as a novel group within the genus Bradyrhizobium. To confirm their taxonomic status, these strains were further characterized by taking a polyphasic approach. The type strain possessed 16S rRNA gene sequences identical to Bradyrhizobium paxllaeri LMTR 21(T) and Bradyrhizobiumicense LMTR 13(T), the full-length sequences were identical to those retrieved from SAMN05230119 and SAMN05230120, respectively...
October 16, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29033922/endophytic-bacteria-improve-plant-growth-symbiotic-performance-of-chickpea-cicer-arietinum-l-and-induce-suppression-of-root-rot-caused-by-fusarium-solani-under-salt-stress
#7
Dilfuza Egamberdieva, Stephan J Wirth, Vyacheslav V Shurigin, Abeer Hashem, Elsayed F Abd Allah
Salinity causes disturbance in symbiotic performance of plants, and increases susceptibility of plants to soil-borne pathogens. Endophytic bacteria are an essential determinant of cross-tolerance to biotic and abiotic stresses in plants. The aim of this study was to isolate non-rhizobial endophytic bacteria from the root nodules of chickpea (Cicer arietinum L.), and to assess their ability to improve plant growth and symbiotic performance, and to control root rot in chickpea under saline soil conditions. A total of 40 bacterial isolates from internal root tissues of chickpea grown in salinated soil were isolated...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29022875/spatio-temporal-control-of-mutualism-in-legumes-helps-spread-symbiotic-nitrogen-fixation
#8
Benoit Daubech, Philippe Remigi, Ginaini Doin de Moura, Marta Marchetti, Cécile Pouzet, Marie-Christine Auriac, Chaitanya S Gokhale, Catherine Masson-Boivin, Delphine Capela
Mutualism is of fundamental importance in ecosystems. Which factors help to keep the relationship mutually beneficial and evolutionarily successful is a central question. We addressed this issue for one of the most significant mutualistic interactions on Earth, which associates plants of the leguminosae family and hundreds of nitrogen (N2)-fixing bacterial species. Here we analyze the spatio-temporal dynamics of fixers and non-fixers along the symbiotic process in the Cupriavidus taiwanensis-Mimosa pudica system...
October 12, 2017: ELife
https://www.readbyqxmd.com/read/28992078/auxin-transport-metabolism-and-signalling-during-nodule-initiation-indeterminate-and-determinate-nodules
#9
Wouter Kohlen, Jason Liang Pin Ng, Eva E Deinum, Ulrike Mathesius
Most legumes can form a unique type of lateral organ on their roots: root nodules. These structures host symbiotic nitrogen-fixing bacteria called rhizobia. Several different types of nodules can be found in nature, but the two best-studied types are called indeterminate and determinate nodules. These two types differ with respect to the presence or absence of a persistent nodule meristem, which consistently correlates with the cortical cell layers giving rise to the nodule primordia. Similar to other plant developmental processes, auxin signalling overlaps with the site of organ initiation and meristem activity...
September 15, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28975015/high-quality-draft-genome-sequence-of-ensifer-meliloti-mlalz-1-a-microsymbiont-of-medicago-laciniata-l-miller-collected-in-lanzarote-canary-islands-spain
#10
Wan Adnawani Meor Osman, Peter van Berkum, Milagros León-Barrios, Encarna Velázquez, Patrick Elia, Rui Tian, Julie Ardley, Margaret Gollagher, Rekha Seshadri, T B K Reddy, Natalia Ivanova, Tanja Woyke, Amrita Pati, Victor Markowitz, Mohamed N Baeshen, Naseebh Nabeeh Baeshen, Nikos Kyrpides, Wayne Reeve
10.1601/nm.1335 Mlalz-1 (INSDC = ATZD00000000) is an aerobic, motile, Gram-negative, non-spore-forming rod that was isolated from an effective nitrogen-fixing nodule of Medicago laciniata (L.) Miller from a soil sample collected near the town of Guatiza on the island of Lanzarote, the Canary Islands, Spain. This strain nodulates and forms an effective symbiosis with the highly specific host M. laciniata. This rhizobial genome was sequenced as part of the DOE Joint Genome Institute 2010 Genomic Encyclopedia for Bacteria and Archaea-Root Nodule Bacteria (GEBA-RNB) sequencing project...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28945515/multiple-nodulation-genes-are-up-regulated-during-establishment-of-reniform-nematode-feeding-sites-in-soybean
#11
Nathan Wayne Redding, Paula Agudelo, Christina E Wells
The semi-endoparastic reniform nematode (Rotylenchulus reniformis) infects over 300 plant species. Females penetrate host roots and induce formation of complex, multinucleate feeding sites called syncytia. While anatomical changes associated with reniform nematode infection are well documented, little is known about their molecular basis. We grew soybean (Glycine max) in a split-root growth system, inoculated half of each root system with R. reniformis, and quantified gene expression in infected and control root tissue at four dates after inoculation...
September 15, 2017: Phytopathology
https://www.readbyqxmd.com/read/28931627/the-nitrate-transporter-family-protein-ljnpf8-6-controls-the-n-fixing-nodule-activity
#12
Vladimir Totev Valkov, Alessandra Rogato, Ludovico Martins Alves, Stefano Sol, Mélanie Noguero, Sophie Léran, Benoit Lacombe, Maurizio Chiurazzi
N-fixing nodules are new organs formed on legume roots as a result of the beneficial interaction with soil bacteria, rhizobia. The nodule functioning is still a poorly characterized step of the symbiotic interaction, as only a few of the genes induced in N-fixing nodules have been functionally characterized. We present here the characterization of a member of the Lotus japonicus nitrate transporter1/peptide transporter family, LjNPF8.6 The phenotypic characterization carried out in independent L. japonicus LORE1 insertion lines indicates a positive role of LjNPF8...
November 2017: Plant Physiology
https://www.readbyqxmd.com/read/28916558/potential-of-rice-stubble-as-a-reservoir-of-bradyrhizobial-inoculum-in-rice-legume-crop-rotation
#13
Pongdet Piromyou, Teerana Greetatorn, Kamonluck Teamtisong, Panlada Tittabutr, Nantakorn Boonkerd, Neung Teaumroong
Bradyrhizobium encompasses a variety of bacteria that can live in symbiotic and endophytic associations with leguminous and nonleguminous plants, such as rice. Therefore, it can be expected that rice endophytic bradyrhizobia can be applied in the rice-legume crop rotation system. Some endophytic bradyrhizobial strains were isolated from rice (Oryza sativa L.) tissues. The rice biomass could be enhanced when supplementing bradyrhizobial strain inoculation with KNO3, NH4NO3, or urea, especially in Bradyrhizobium sp...
November 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28902963/rhizospheric-fungi-and-their-link-with-the-nitrogen-fixing-frankia-harbored-in-host-plant-hippophae-rhamnoides-l
#14
Xue Zhou, Lei Tian, Jianfeng Zhang, Lina Ma, Xiujun Li, Chunjie Tian
Sea buckthorn (Hippophae rhamnoides L.) is a pioneer plant used for land reclamation and an appropriate material for studying the interactions of symbiotic microorganisms because of its nitrogen-fixing root nodules and mycorrhiza. We used high-throughput sequencing to reveal the diversities and community structures of rhizospheric fungi and their link with nitrogen-fixing Frankia harbored in sea buckthorn collected along an altitude gradient from the Qinghai Tibet Plateau to interior areas. We found that the fungal diversities and compositions varied between different sites...
September 13, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28887555/monitoring-the-colonization-and-infection-of-legume-nodules-by-micromonospora-in-co-inoculation-experiments-with-rhizobia
#15
Patricia Benito, Pablo Alonso-Vega, Carolina Aguado, Rafael Luján, Yojiro Anzai, Ann M Hirsch, Martha E Trujillo
The discovery that the actinobacterium Micromonospora inhabits nitrogen-fixing nodules raised questions as to its potential ecological role. The capacity of two Micromonospora strains to infect legumes other than their original host, Lupinus angustifolius, was investigated using Medicago and Trifolium as test plants. Compatible rhizobial strains were used for coinoculation of the plants because Micromonospora itself does not induce nodulation. Over 50% of nodules from each legume housed Micromonospora, and using 16S rRNA gene sequence identification, we verified that the reisolated strains corresponded to the microorganisms inoculated...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28884663/proposal-of-candidatus-frankia-californiensis-the-uncultured-symbiont-in-nitrogen-fixing-root-nodules-of-a-phylogenetically-broad-group-of-hosts-endemic-to-western-north-america
#16
Philippe Normand, Thanh Van Nguyen, Kai Battenberg, Alison M Berry, Brian Vanden Heuvel, Maria P Fernandez, Katharina Pawlowski
The genus Frankia comprises a group of nitrogen-fixing actinobacteria that form root-nodule symbioses with perennial dicotyledonous plants in the nitrogen-fixing clade. These bacteria have been characterized phylogenetically and grouped into four clusters (clusters 1-4). Cluster 2 contains mostly uncultured strains that induce nodules on species of the genera Datisca (Datiscaceae), Coriaria (Coriariaceae), Ceanothus (Rhamnaceae) and several genera in the family Rosaceae (Cercocarpus, Chamaebatia, Dryas, Purshia), all of which except members of the genus Coriaria are present within the California Floristic Province (CFP) or neighbouring areas of western North America...
October 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28869059/soybeans-inoculated-with-root-zone-soils-of-canadian-native-legumes-harbour-diverse-and-novel-bradyrhizobium-spp-that-possess-agricultural-potential
#17
Eden S P Bromfield, Sylvie Cloutier, James T Tambong, Thu Van Tran Thi
An assessment was made of the evolutionary relationships of soybean nodulating bacteria associated with legumes native to eastern Canada to identify potential new sources of soybean inoculant strains. Short season soybeans were used to selectively trap bacteria from root zone soils of four native legume species. Screening of more than 800 bacterial isolates from soybean root nodules by analysis of recA gene sequences followed by analyses of selected genotypes using six core and two symbiosis (nodC and nifH) gene sequences permitted identification of diverse taxa that included eight novel and four named Bradyrhizobium species as well as lineages attributed to the genera Afipia and Tardiphaga...
August 18, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28867628/molecular-and-phenotypic-characterization-of-endophytic-bacteria-isolated-from-sulla-nodules
#18
Hamida Beghalem, Khadidja Aliliche, Ali Chriki, Ahmed Landoulsi
In the current study, bacterial diversity was investigated in root nodules of Sulla pallida and Sulla capitata. The isolates were analyzed on the basis of their phenotypic and molecular characteristics. The phylogenetic analysis based on 16S rRNA and housekeeping genes (recA and atpD) showed that the isolated bacteria related to Sinorhizobium, Neorhizobium, Phyllobacterium, Arthrobacter, Variovorax and Pseudomonas genera. This is the first report of Neorhizobium genus associated with Hedysarum genus. Phenotypically, all strains tolerate the elevated temperature of 40 °C, and salt stress at a concentration of 2%...
October 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28831061/integrated-roles-of-bcla-and-dd-carboxypeptidase-1-in-bradyrhizobium-differentiation-within-ncr-producing-and-ncr-lacking-root-nodules
#19
Quentin Barrière, Ibtissem Guefrachi, Djamel Gully, Florian Lamouche, Olivier Pierre, Joël Fardoux, Clémence Chaintreuil, Benoît Alunni, Tatiana Timchenko, Eric Giraud, Peter Mergaert
Legumes harbor in their symbiotic nodule organs nitrogen fixing rhizobium bacteria called bacteroids. Some legumes produce Nodule-specific Cysteine-Rich (NCR) peptides in the nodule cells to control the intracellular bacterial population. NCR peptides have antimicrobial activity and drive bacteroids toward terminal differentiation. Other legumes do not produce NCR peptides and their bacteroids are not differentiated. Bradyrhizobia, infecting NCR-producing Aeschynomene plants, require the peptide uptake transporter BclA to cope with the NCR peptides as well as a specific peptidoglycan-modifying DD-carboxypeptidase, DD-CPase1...
August 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28768212/effects-of-biosolids-from-a-wastewater-treatment-plant-receiving-manufactured-nanomaterials-on-medicago-truncatula-and-associated-soil-microbial-communities-at-low-nanomaterial-concentrations
#20
Chun Chen, Olga V Tsyusko, Dave H McNear, Jonathan Judy, Ricky W Lewis, Jason M Unrine
Concern has grown regarding engineered nanomaterials (ENMs) entering agricultural soils through the application of biosolids and their possible effects on agroecosystems, even though the ENMs are extensively transformed. The effects of exposure to biosolids containing transformation products of these ENMs at low concentrations remain largely unexplored. We examined the responses of Medicago truncatula and its symbiotic rhizobia Sinorhizobium meliloti exposed to soil amended with biosolids from WWTP containing low added concentrations of ENMs (ENM Low), bulk/dissolved metals (bulk/dissolved Low), or no metal additions (control)...
December 31, 2017: Science of the Total Environment
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