scholarly journals Enrichments/Derichments of Root-Associated Bacteria Related to Plant Growth and Nutrition Caused by the Growth of an EPSPS-Transgenic Maize Line in the Field

2019 ◽  
Vol 10 ◽  
Author(s):  
Zhong-Ling Wen ◽  
Min-Kai Yang ◽  
Mei-Hang Du ◽  
Zhao-Zhao Zhong ◽  
Yun-Ting Lu ◽  
...  
Keyword(s):  
Plant Growth ◽  
Transgenic Maize ◽  
Maize Line ◽  
Associated Bacteria ◽  
Growth And Nutrition

scholarly journals Isolation and Characterization of Nodule-AssociatedExiguobacterium sp. from the Root Nodules ofFenugreek(Trigonella foenum-graecum) and Their Possible Role in Plant Growth Promotion

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Geetha Rajendran ◽  
Maheshwari H. Patel ◽  
Sanket J. Joshi
Keyword(s):  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Root Nodules ◽  
Dry Weight ◽  
Gram Positive ◽  
Associated Bacteria ◽  
Trigonella Foenum Graecum ◽  
Isolation And Characterization ◽  
Root And Shoot Length

One of the ways to increase the competitive survivability of rhizobial biofertilizers and thus achieve better plant growth under such conditions is by modifying the rhizospheric environment or community by addition of nonrhizobial nodule-associated bacteria (NAB) that cause better nodulation and plant growth when coinoculated with rhizobia. A study was performed to investigate the most commonly associated nodule-associated bacteria and the rhizospheric microorganisms associated with theFenugreek(Trigonella foenum-graecum) plant. Isolation of nonrhizobial isolates from root nodules ofFenugreekwas carried out along with the rhizospheric isolates. About 64.7% isolates obtained fromFenugreeknodules were gram-negative coccobacilli, 29.41% were gram-positive bacilli, and all rhizospheric isolates except one were gram-positive bacilli. All the isolates were characterized for their plant growth promoting (PGP) activities. Two of the NAB isolates M2N2c and B1N2b (Exiguobacterium sp.) showed maximum positive PGP features. Those NAB isolates when coinoculated with rhizobial strain—S. meliloti, showed plant growth promotion with respect to increase in plant’s root and shoot length, chlorophyll content, nodulation efficiency, and nodule dry weight.

Phosphate-solubilizing peanut associated bacteria: screening for plant growth-promoting activities

2009 ◽  
Vol 329 (1-2) ◽  
pp. 421-431 ◽  
Author(s):  
Tania Taurian ◽  
María Soledad Anzuay ◽  
Jorge Guillermo Angelini ◽  
María Laura Tonelli ◽  
Liliana Ludueña ◽  
...  
Keyword(s):  
Plant Growth ◽  
Associated Bacteria ◽  
Plant Growth Promoting Activities ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Phosphate Solubilizing

scholarly journals Screening of epiphytic rhizosphere-associated bacteria in Argentinian Malbec and Cabernet-Sauvignon vineyards for potential use as biological fertilisers and pathogen-control agents

OENO One ◽  
2021 ◽  
Vol 55 (4) ◽  
pp. 145-157
Author(s):  
Mónica Oyuela Aguilar ◽  
Florencia Álvarez ◽  
Daniela Medeot ◽  
Edgardo Jofré ◽  
Liliana Semorile ◽  
...  
Keyword(s):  
Plant Growth ◽  
Cabernet Sauvignon ◽  
Bacterial Isolates ◽  
Associated Bacteria ◽  
Biological Potential ◽  
Plant Growth Promoting ◽  
Pathogen Control ◽  
Pgp Activities ◽  
Growth Promoting ◽  
Potential Use

The rhizosphere-associated microbiome has diverse functions that support plant growth and health, varying among plant species, vegetation growth stages and environmental habitats. This microbiome includes a group of bacteria denominated plant growth-promoting rhizobacteria (PGPR) which can colonize plant roots. Certain PGPR isolates improve the ability of plants to adapt to a stressful environment. In this study, we collected and characterised the rhizosphere-associated bacteria, or epiphytic rhizobacteria, from Malbec and Cabernet-Sauvignon vineyards from the main wine-producing provinces of Argentina to analyse their potential use as biologic fertilisers and/or as pathogen-control agents. A total of 170 bacterial isolates were obtained, distributed into eleven different genera and classified into three phyla, Proteobacteria, Actinobacteria and Firmicutes. The in vitro analysis for plant-growth-promoting (PGP) activities demonstrated that a significant number of bacterial isolates had one or more of these traits. The Pseudomonas was the genus with the highest number of isolates and PGP activities, followed by the Arthrobacter, Serratia, Bacillus andPantoea. We observed that bacterial isolates identified as Bacillus exhibited a remarkable production of hydrolytic enzymes related to biocontrol activities. Biocontrol trials from the Bacillus collection revealed that at least five isolates were able to inhibit the fungal growth of Botrytis cinerea and Alternaria alternata. The results obtained suggest the biological potential of each isolate and the relevance of proceeding to greenhouse and field assays to obtain long-term environmentally compatible bio-products for vineyard management.

scholarly journals Abiotic Stresses Shift Belowground Populus-Associated Bacteria Toward a Core Stress Microbiome

mSystems ◽  
2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Collin M. Timm ◽  
Kelsey R. Carter ◽  
Alyssa A. Carrell ◽  
Se-Ran Jun ◽  
Sara S. Jawdy ◽  
...  
Keyword(s):  
Plant Growth ◽  
Environmental Conditions ◽  
Bacterial Communities ◽  
Abiotic Stresses ◽  
Growth Conditions ◽  
Plant Host ◽  
Associated Bacteria ◽  
Poplar Trees

The identification of a common “stress microbiome” indicates tightly controlled relationships between the plant host and bacterial associates and a conserved structure in bacterial communities associated with poplar trees under different growth conditions. The ability of the microbiome to buffer the plant from extreme environmental conditions coupled with the conserved stress microbiome observed in this study suggests an opportunity for future efforts aimed at predictably modulating the microbiome to optimize plant growth.

scholarly journals Growth and Nutrition of Eucalypt Rooted Cuttings Promoted by Ectomycorrhizal Fungi in Commercial Nurseries

2015 ◽  
Vol 39 (6) ◽  
pp. 1554-1565 ◽  
Author(s):  
Andrezza Mara Martins Gandini ◽  
Paulo Henrique Grazziotti ◽  
Márcio José Rossi ◽  
Danielle Cristina Fonseca Santos Grazziotti ◽  
Elizzandra Marta Martins Gandini ◽  
...  
Keyword(s):  
Plant Growth ◽  
Ectomycorrhizal Fungi ◽  
Application Rate ◽  
Fungal Colonization ◽  
Rooted Cuttings ◽  
Amanita Muscaria ◽  
Application Rates ◽  
Randomized Design ◽  
Growth And Nutrition

ABSTRACT Ectomycorrhizal fungi (EMF) may improve the adaptation of eucalypts saplings to field conditions and allow more efficient fertilizer use. The effectiveness of EMF inoculum application in promoting fungal colonization, plant growth, nutrient uptake, and the quality of rooted cuttings was evaluated forEucalyptus urophylla under commercial nursery conditions. For inoculated treatments, fertilization of the sapling substrate was reduced by 50 %. The experiment was carried out in a completely randomized design in a 4 × 4 factorial arrangement, wherein the factors were inoculum application rates of 0 (control), 5, 10, and 15 gel beads of calcium alginate containing the vegetative mycelium of Amanita muscaria, Elaphomyces antracinus, Pisolithus microcarpus, andScleroderma areolatum, plus a non-inoculated treatment without fertilization reduction in the substrate (commercial). Ectomycorrhizal fungi increased plant growth and fungal colonization as well as N and K uptake evenly. The best plant growth and fungal colonization were observed for the highest application rate. The greatest growth and fungal colonization and contents of P, N, and K were observed at the 10-bead rate. Plant inoculation with Amanita muscaria, Elaphomyces anthracinus, and Scleroderma areolatum increased P concentrations and contents in a differential manner. The Dickson Quality Index was not affected by the type of fungi or by inoculum application rates. Eucalypt rooted cuttings inoculated with ectomycorrhizal fungi and under half the amount of commercial fertilization had P, N, and K concentrations and contents greater than or equal to those of commercial plants and have high enough quality to be transplanted after 90 days.

scholarly journals Plant Growth Promotion Potential Is Equally Represented in Diverse Grapevine Root-Associated Bacterial Communities from Different Biopedoclimatic Environments

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
Ramona Marasco ◽  
Eleonora Rolli ◽  
Marco Fusi ◽  
Ameur Cherif ◽  
Ayman Abou-Hadid ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Plant Growth ◽  
Bacterial Communities ◽  
Growth Promotion ◽  
Rrna Gene ◽  
Similar Distribution ◽  
Bacterial Assemblage ◽  
Pgp Traits ◽  
Associated Bacteria

Plant-associated bacteria provide important services to host plants. Environmental factors such as cultivar type and pedoclimatic conditions contribute to shape their diversity. However, whether these environmental factors may influence the plant growth promoting (PGP) potential of the root-associated bacteria is not widely understood. To address this issue, the diversity and PGP potential of the bacterial assemblage associated with the grapevine root system of different cultivars in three Mediterranean environments along a macrotransect identifying an aridity gradient were assessed by culture-dependent and independent approaches. According to 16S rRNA gene PCR-DGGE, the structure of endosphere and rhizosphere bacterial communities was highly diverse (P=0.03) and was associated with a cultivar/latitudinal/climatic effect. Despite being diverse, the bacterial communities associated with Egyptian grapevines shared a higher similarity with the Tunisian grapevines than those cultivated in North Italy. A similar distribution, according to the cultivar/latitude/aridity gradients, was observed for the cultivable bacteria. Many isolates (23%) presentedin vitromultiple stress resistance capabilities and PGP activities, the most frequent being auxin synthesis (82%), insoluble phosphate solubilisation (61%), and ammonia production (70%). The comparable numbers and types of potential PGP traits among the three different environmental settings indicate a strong functional homeostasis of beneficial bacteria associated with grape root.

scholarly journals Diversity, Phylogeny and Plant Growth Promotion Traits of Nodule Associated Bacteria Isolated from Lotus parviflorus

2020 ◽  
Vol 8 (4) ◽  
pp. 499 ◽  
Author(s):  
Ricardo Soares ◽  
Jesús Trejo ◽  
Maria J. Lorite ◽  
Etelvina Figueira ◽  
Juan Sanjuán ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Root Nodules ◽  
Nifh Gene ◽  
Bacterial Strains ◽  
Lytic Enzymes ◽  
Taxonomic Assignment ◽  
Pgp Traits ◽  
Associated Bacteria

Lotus spp. are widely used as a forage to improve pastures, and inoculation with elite rhizobial strains is a common practice in many countries. However, only a few Lotus species have been studied in the context of plant-rhizobia interactions. In this study, forty highly diverse bacterial strains were isolated from root nodules of wild Lotus parviflorus plants growing in two field locations in Portugal. However, only 10% of these isolates could nodulate one or more legume hosts tested, whereas 90% were thought to be opportunistic nodule associated bacteria. Phylogenetic studies place the nodulating isolates within the Bradyrhizobium genus, which is closely related to B. canariense and other Bradyrhizobium sp. strains isolated from genistoid legumes and Ornithopus spp. Symbiotic nodC and nifH gene phylogenies were fully consistent with the taxonomic assignment and host range. The non-nodulating bacteria isolated were alpha- (Rhizobium/Agrobacterium), beta- (Massilia) and gamma-proteobacteria (Pseudomonas, Lysobacter, Luteibacter, Stenotrophomonas and Rahnella), as well as some bacteroidetes from genera Sphingobacterium and Mucilaginibacter. Some of these nodule-associated bacteria expressed plant growth promotion (PGP) traits, such as production of lytic enzymes, antagonistic activity against phytopathogens, phosphate solubilization, or siderophore production. This argues for a potential beneficial role of these L. parviflorus nodule-associated bacteria.

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