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Root nodule bacteria

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https://www.readbyqxmd.com/read/28074430/the-monomeric-gtpase-raba2-is-required-for-progression-and-maintenance-of-membrane-integrity-of-infection-threads-during-root-nodule-symbiosis
#1
Virginia Dalla Via, Soledad Traubenik, Claudio Rivero, O Mario Aguilar, María Eugenia Zanetti, Flavio Antonio Blanco
Progression of the infection canal that conducts rhizobia to the nodule primordium requires a functional Rab GTPase located in Golgi/trans-Golgi that also participate in root hair polar growth. Common bean (Phaseolus vulgaris) symbiotically associates with its partner Rhizobium etli, resulting in the formation of root nitrogen-fixing nodules. Compatible bacteria can reach cortical cells in a tightly regulated infection process, in which the specific recognition of signal molecules is a key step to select the symbiotic partner...
January 10, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28067580/cis-regulatory-plethora-promoter-elements-directing-root-and-nodule-expression-are-conserved-between-arabidopsis-thaliana-and-medicago-truncatula
#2
Henk J Franssen, Olga Kulikova, Viola Willemsen, Renze Heidstra
Nodules are unique organs formed on roots of legumes by soil-borne bacteria, collectively known as rhizobium. Recently, we have shown that orthologs of the AINTEGUMENTA-like (AIL) AP2 transcription factors PLETHORA (PLT) 1 to 4, that redundantly regulate Arabidopsis thaliana root development are involved in root and nodule growth in Medicago truncatula. Hence, it is conceivable that rhizobium has co-opted these genes for nodule development. Whether this co-option requires the presence of specific cis-elements in the promoters and/or specialisation of PLT protein function is not clear...
January 9, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28062461/diverse-bacteria-affiliated-with-the-genera-microvirga-phyllobacterium-and-bradyrhizobium-nodulate-lupinus-micranthus-growing-in-soils-of-northern-tunisia
#3
Abdelhakim Msaddak, David Durán, Mokhtar Rejili, Mohamed Mars, Tomás Ruiz-Argüeso, Juan Imperial, José Palacios, Luis Rey
: The genetic diversity of bacterial populations nodulating Lupinus micranthus in five geographical sites from Northern Tunisia was examined. Phylogenetic analyses of fifty isolates based on recA and gyrB gene partial sequences grouped strains in seven clusters, five of which belong to genus Bradyrhizobium (28 isolates), one to Phyllobacterium (2 isolates), and one, remarkably, to Microvirga (20 isolates). The largest Bradyrhizobium cluster (17 isolates) grouped with the B. lupini species and the other five clusters were close to different, recently defined Bradyrhizobium species...
January 6, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28011129/fast-and-sensitive-in-vivo-studies-under-controlled-environmental-conditions-to-substitute-long-term-field-trials-with-genetically-modified-plants
#4
Patricia Horn, André Schlichting, Christel Baum, Ute Hammesfahr, Sören Thiele-Bruhn, Peter Leinweber, Inge Broer
We introduce an easy, fast and effective method to analyze the influence of genetically modified (GM) plants on soil and model organisms in the laboratory to substitute laborious and time consuming field trials. For the studies described here we focused on two GM plants of the so-called 3rd generation: GM plants producing pharmaceuticals (PMP) and plant made industrials (PMI). Cyanophycin synthetase (cphA) was chosen as model for PMI and Choleratoxin B (CTB) as model for PMP. The model genes are expressed in transgenic roots of composite Vicia hirsuta plants grown in petri dishes for semi-sterile growth or small containers filled with non-sterile soil...
December 21, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27929718/lotus-japonicus-nf-ya1-plays-an-essential-role-during-nodule-differentiation-and-targets-members-of-the-shi-sty-gene-family
#5
Md Shakhawat Hossain, Arina Shrestha, Sihui Zhong, Mandana Miri, Ryan S Austin, Shusei Sato, Loretta Ross, Terry Huebert, Alexandre Tromas, Ivone Torres-Jerez, Yuhong Tang, Michael Udvardi, Jeremy D Murray, Krzysztof Szczyglowski
Legume plants engage in intimate relationships with rhizobial bacteria to form nitrogen-fixing nodules, root-derived organs that accommodate the microsymbiont. Members of the Nuclear Factor Y (NF-Y) gene family, which have undergone significant expansion and functional diversification during plant evolution, are essential for this symbiotic liaison. Acting in a partially redundant manner, NF-Y proteins were shown, previously, to regulate bacterial infection, including selection of a superior rhizobial strain, and to mediate nodule structure formation...
December 8, 2016: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/27915286/presence-of-diverse-rhizobial-communities-responsible-for-nodulation-of-common-bean-phaseolus-vulgaris-in-south-african-and-mozambican-soils
#6
Mwazuma K Zinga, Sanjay K Jaiswal, Felix D Dakora
The diversity and phylogeny of root-nodule bacteria isolated from common bean grown in Mozambique and different provinces of South Africa was studied by restriction fragment length polymorphism and phylogenetic analysis. The combined restriction banding pattern of 16S rRNA and nifH profile-generated dendrogram grouped all test isolates into four major clusters with XXI restriction group and three clusters with the VIII restriction groups. Location-based clustering was observed with the 16S-RFLP analysis. Phylogenetic analysis of 16S rRNA, glnII, gyrB and gltA sequences showed that common bean was nodulated specifically by Rhizobium etli in Mozambican soils, and by diverse of group of Rhizobium species in South African soils (e...
December 2, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27891144/a-developmental-and-molecular-view-of-formation-of-auxin-induced-nodule-like-structures-in-land-plants
#7
Ryan Hiltenbrand, Jacklyn Thomas, Hannah McCarthy, Karl J Dykema, Ashley Spurr, Hamilton Newhart, Mary E Winn, Arijit Mukherjee
Several studies have shown that plant hormones play important roles during legume-rhizobia symbiosis. For instance, auxins induce the formation of nodule-like structures (NLSs) on legume roots in the absence of rhizobia. Furthermore, these NLS can be colonized by nitrogen-fixing bacteria, which favor nitrogen fixation compared to regular roots and subsequently increase plant yield. Interestingly, auxin also induces similar NLS in cereal roots. While several genetic studies have identified plant genes controlling NLS formation in legumes, no studies have investigated the genes involved in NLS formation in cereals...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27891120/two-major-clades-of-bradyrhizobia-dominate-symbiotic-interactions-with-pigeonpea-in-fields-of-c%C3%A3-te-d-ivoire
#8
Romain K Fossou, Dominik Ziegler, Adolphe Zézé, François Barja, Xavier Perret
In smallholder farms of Côte d'Ivoire, particularly in the northeast of the country, Cajanus cajan (pigeonpea) has become an important crop because of its multiple beneficial facets. Pigeonpea seeds provide food to make ends meet, are sold on local markets, and aerial parts serve as forage for animals. Since it fixes atmospheric nitrogen in symbiosis with soil bacteria collectively known as rhizobia, C. cajan also improves soil fertility and reduces fallow time. Yet, seed yields remain low mostly because farmers cannot afford chemical fertilizers...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27876549/nitrogen-fixing-bacteria-and-arbuscular-mycorrhizal-fungi-in-piptadenia-gonoacantha-mart-macbr
#9
Joel Quintino de Oliveira Júnior, Ederson da Conceição Jesus, Francy Junio Lisboa, Ricardo Luis Louro Berbara, Sergio Miana de Faria
The family Leguminosae comprises approximately 20,000 species that mostly form symbioses with arbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (NFB). This study is aimed at investigating and confirming the dependence on nodulation and biological nitrogen fixation in the specie Piptadenia gonoacantha (Mart.) Macbr., which belongs to the Piptadenia group. Two consecutive experiments were performed in a greenhouse. The experiments were fully randomized with six replicates and a factorial scheme...
November 8, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/27864511/root-nodule-symbiosis-in-lotus-japonicus-drives-the-establishment-of-distinctive-rhizosphere-root-and-nodule-bacterial-communities
#10
Rafal Zgadzaj, Ruben Garrido-Oter, Dorthe Bodker Jensen, Anna Koprivova, Paul Schulze-Lefert, Simona Radutoiu
Lotus japonicus has been used for decades as a model legume to study the establishment of binary symbiotic relationships with nitrogen-fixing rhizobia that trigger root nodule organogenesis for bacterial accommodation. Using community profiling of 16S rRNA gene amplicons, we reveal that in Lotus, distinctive nodule- and root-inhabiting communities are established by parallel, rather than consecutive, selection of bacteria from the rhizosphere and root compartments. Comparative analyses of wild-type (WT) and symbiotic mutants in Nod factor receptor5 (nfr5), Nodule inception (nin) and Lotus histidine kinase1 (lhk1) genes identified a previously unsuspected role of the nodulation pathway in the establishment of different bacterial assemblages in the root and rhizosphere...
December 6, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27854061/metal-resistant-rhizobacteria-isolates-improve-mucuna-deeringiana-phytoextraction-capacity-in-multi-metal-contaminated-soils-from-a-gold-mining-area
#11
Cácio Luiz Boechat, Patricia Giovanella, Magno Batista Amorim, Enilson Luiz Saccol de Sá, Flávio Anastácio de Oliveira Camargo
Phytoremediation consists of biological techniques for heavy metal remediation, which include exploring the genetic package of vegetable species to remove heavy metals from the environment. The goals of this study were to investigate heavy metal and bioaugmentation effects on growth and nutrient uptake by Mucuna deeringiana; to determine the metal translocation factor and bioconcentration factor and provide insight for using native bacteria to enhance heavy metal accumulation. The experiment was conducted under greenhouse conditions using a 2 × 4 factorial scheme with highly and slightly contaminated soil samples and inoculating M...
November 16, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27846795/quantitative-modelling-of-legume-root-nodule-primordium-induction-by-a-diffusive-signal-of-epidermal-origin-that-inhibits-auxin-efflux
#12
Eva E Deinum, Wouter Kohlen, René Geurts
BACKGROUND: Rhizobium nitrogen fixation in legumes takes place in specialized organs called root nodules. The initiation of these symbiotic organs has two important components. First, symbiotic rhizobium bacteria are recognized at the epidermis through specific bacterially secreted lipo-chitooligosaccharides (LCOs). Second, signaling processes culminate in the formation of a local auxin maximum marking the site of cell divisions. Both processes are spatially separated. This separation is most pronounced in legumes forming indeterminate nodules, such as model organism Medicago truncatula, in which the nodule primordium is formed from pericycle to most inner cortical cell layers...
November 15, 2016: BMC Plant Biology
https://www.readbyqxmd.com/read/27833841/plant-growth-promotion-and-biofortification-of-chickpea-and-pigeonpea-through-inoculation-of-biocontrol-potential-bacteria-isolated-from-organic-soils
#13
Subramaniam Gopalakrishnan, Srinivas Vadlamudi, Srinivasan Samineni, C V Sameer Kumar
Seven strains of bacteria [Pseudomonas plecoglossicida SRI-156, Brevibacterium antiquum SRI-158, Bacillus altitudinis SRI-178, Enterobacter ludwigii SRI-211, E. ludwigii SRI-229, Acinetobacter tandoii SRI-305 and Pseudomonas monteilii SRI-360; demonstrated previously for control of charcoal rot disease in sorghum and plant growth-promotion (PGP) in rice] were evaluated for their PGP and biofortification traits in chickpea and pigeonpea under field conditions. When treated on seed, the seven selected bacteria significantly enhanced the shoot height and root length of both chickpea and pigeonpea over the un-inoculated control...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27780398/microbial-cooperation-in-the-rhizosphere-improves-liquorice-growth-under-salt-stress
#14
Dilfuza Egamberdieva, Stephan Wirth, Li Li, Elsayed Fathi Abd-Allah, Kristina Lindström
Liquorice (Glycyrrhiza uralensis Fisch.) is one of the most widely used plants in food production, and it can also be used as an herbal medicine or for reclamation of salt-affected soils. Under salt stress, inhibition of plant growth, nutrient acquisition and symbiotic interactions between the medicinal legume liquorice and rhizobia have been observed. We recently evaluated the interactions between rhizobia and root-colonizing Pseudomonas in liquorice grown in potting soil and observed increased plant biomass, nodule numbers and nitrogen content after combined inoculation compared to plants inoculated with Mesorhizobium alone...
October 26, 2016: Bioengineered
https://www.readbyqxmd.com/read/27756807/starting-points-in-plant-bacteria-nitrogen-fixing-symbioses-intercellular-invasion-of-the-roots
#15
REVIEW
Fernando Ibáñez, Luis Wall, Adriana Fabra
Agricultural practices contribute to climate change by releasing greenhouse gases such as nitrous oxide that are mainly derived from nitrogen fertilizers. Therefore, understanding biological nitrogen fixation in farming systems is beneficial to agriculture and environmental preservation. In this context, a better grasp of nitrogen-fixing systems and nitrogen-fixing bacteria-plant associations will contribute to the optimization of these biological processes. Legumes and actinorhizal plants can engage in a symbiotic interaction with nitrogen-fixing rhizobia or actinomycetes, resulting in the formation of specialized root nodules...
October 18, 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27749147/deletion-of-the-sacpd-c-locus-alters-the-symbiotic-relationship-between-bradyrhizobium-japonicum-usda110-and-soybean-resulting-in-elicitation-of-plant-defense-response-and-nodulation-defects
#16
Hari B Krishnan, Alaa A Alaswad, Nathan W Oehrle, Jason D Gillman
Legumes form symbiotic associations with soil-dwelling bacteria collectively called rhizobia. This association results in the formation of nodules, unique plant-derived organs, within which the rhizobia are housed. Rhizobia-encoded nitrogenase facilitates the conversion of atmospheric nitrogen into ammonia, which is utilized by the plants for its growth and development. Fatty acids have been shown to play an important role in root nodule symbiosis. In this study, we have investigated the role of stearoyl-acyl carrier protein desaturase isoform C (SACPD-C), a soybean enzyme that catalyzes the conversion of stearic acid into oleic acid, which is expressed in developing seeds and in nitrogen-fixing nodules...
November 2016: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/27748755/a-proteomic-atlas-of-the-legume-medicago-truncatula-and-its-nitrogen-fixing-endosymbiont-sinorhizobium-meliloti
#17
Harald Marx, Catherine E Minogue, Dhileepkumar Jayaraman, Alicia L Richards, Nicholas W Kwiecien, Alireza F Sihapirani, Shanmugam Rajasekar, Junko Maeda, Kevin Garcia, Angel R Del Valle-Echevarria, Jeremy D Volkening, Michael S Westphall, Sushmita Roy, Michael R Sussman, Jean-Michel Ané, Joshua J Coon
Legumes are essential components of agricultural systems because they enrich the soil in nitrogen and require little environmentally deleterious fertilizers. A complex symbiotic association between legumes and nitrogen-fixing soil bacteria called rhizobia culminates in the development of root nodules, where rhizobia fix atmospheric nitrogen and transfer it to their plant host. Here we describe a quantitative proteomic atlas of the model legume Medicago truncatula and its rhizobial symbiont Sinorhizobium meliloti, which includes more than 23,000 proteins, 20,000 phosphorylation sites, and 700 lysine acetylation sites...
October 17, 2016: Nature Biotechnology
https://www.readbyqxmd.com/read/27633524/mitigation-of-soil-n2o-emission-by-inoculation-with-a-mixed-culture-of-indigenous-bradyrhizobium-diazoefficiens
#18
Hiroko Akiyama, Yuko Takada Hoshino, Manabu Itakura, Yumi Shimomura, Yong Wang, Akinori Yamamoto, Kanako Tago, Yasuhiro Nakajima, Kiwamu Minamisawa, Masahito Hayatsu
Agricultural soil is the largest source of nitrous oxide (N2O), a greenhouse gas. Soybean is an important leguminous crop worldwide. Soybean hosts symbiotic nitrogen-fixing soil bacteria (rhizobia) in root nodules. In soybean ecosystems, N2O emissions often increase during decomposition of the root nodules. Our previous study showed that N2O reductase can be used to mitigate N2O emission from soybean fields during nodule decomposition by inoculation with nosZ++ strains [mutants with increased N2O reductase (N2OR) activity] of Bradyrhizobium diazoefficiens...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27602024/the-regulatory-protein-rosr-affects-rhizobium-leguminosarum-bv-trifolii-protein-profiles-cell-surface-properties-and-symbiosis-with-clover
#19
Kamila Rachwał, Aleksandra Boguszewska, Joanna Kopcińska, Magdalena Karaś, Marek Tchórzewski, Monika Janczarek
Rhizobium leguminosarum bv. trifolii is capable of establishing a symbiotic relationship with plants from the genus Trifolium. Previously, a regulatory protein encoded by rosR was identified and characterized in this bacterium. RosR possesses a Cys2-His2-type zinc finger motif and belongs to Ros/MucR family of rhizobial transcriptional regulators. Transcriptome profiling of the rosR mutant revealed a role of this protein in several cellular processes, including the synthesis of cell-surface components and polysaccharides, motility, and bacterial metabolism...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27601031/genomic-studies-of-nitrogen-fixing-rhizobial-strains-from-phaseolus-vulgaris-seeds-and-nodules
#20
Humberto Peralta, Alejandro Aguilar, Rafael Díaz, Yolanda Mora, Gabriel Martínez-Batallar, Emmanuel Salazar, Carmen Vargas-Lagunas, Esperanza Martínez, Sergio Encarnación, Lourdes Girard, Jaime Mora
BACKGROUND: Rhizobia are soil bacteria that establish symbiotic relationships with legumes and fix nitrogen in root nodules. We recently reported that several nitrogen-fixing rhizobial strains, belonging to Rhizobium phaseoli, R. trifolii, R. grahamii and Sinorhizobium americanum, were able to colonize Phaseolus vulgaris (common bean) seeds. To gain further insight into the traits that support this ability, we analyzed the genomic sequences and proteomes of R. phaseoli (CCGM1) and S. americanum (CCGM7) strains from seeds and compared them with those of the closely related strains CIAT652 and CFNEI73, respectively, isolated only from nodules...
2016: BMC Genomics
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