Microalga Growth-Promoting Bacteria (MGPB): A formal term proposed for beneficial bacteria involved in microalgal–bacterial interactions

2022 ◽  
Vol 61 ◽  
pp. 102585
Author(s):  
Oskar A. Palacios ◽  
Blanca R. López ◽  
Luz E. de-Bashan
Keyword(s):  
Beneficial Bacteria ◽  
Bacterial Interactions ◽  
Growth Promoting

Isolation and identification of plant growth-promoting bacteria associated with tall fescue

2009 ◽  
pp. 211-216 ◽  
Author(s):  
J. Monk ◽  
E. Gerard ◽  
S. Young ◽  
K. Widdup ◽  
M. O'Callaghan
Keyword(s):  
New Zealand ◽  
Plant Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Plant Growth Promoting Bacteria ◽  
Beneficial Bacteria ◽  
Isolation And Identification ◽  
Naturally Occurring ◽  
Plant Growth Promoting ◽  
Growth Promoting

Tall fescue (Festuca arundinacea) is a useful alternative to ryegrass in New Zealand pasture but it is slow to establish. Naturally occurring beneficial bacteria in the rhizosphere can improve plant growth and health through a variety of direct and indirect mechanisms. Keywords: rhizosphere, endorhiza, auxin, siderophore, P-solubilisation

scholarly journals An Insight into the Role of Benefical Bacteria in Periodontal Pocket Recolonization: A Literature Review

2014 ◽  
Vol 8 (1) ◽  
pp. 47-50
Author(s):  
SM Apoorva ◽  
A Suchetha ◽  
DB Mundinamane ◽  
DP Bhopale ◽  
A Bharwani ◽  
...  
Keyword(s):  
Bacterial Species ◽  
Periodontal Pocket ◽  
Human Beings ◽  
Beneficial Bacteria ◽  
Initial Attachment ◽  
Bacterial Interactions ◽  
Tooth Surfaces ◽  
Free People ◽  
Insight Into

ABSTRACT Microflora can be found in both caries-free and periodontitis-free people and caries-affected and periodontitis-affected people, and many clinical studies reveal that the portion of certain bacterial species such as Streptococcus mutans or Porphyromonas gingivalis, respectively, is increased in patients with caries or periodontitis. Therefore, it seems that the competition that results between beneficial bacteria and virulent bacteria leads to either a healthy or sick status of human beings. Competition between members of the dental microflora and there role in pocket recolonization is very complex and many antagonistic characteristics can be observed from competition for initial attachment on tooth surfaces or for later attachment to pioneer bacteria, competition from bacteriocins or hydrogen peroxide secreted and from facilitating the growth of some species which inhibit other species. To date only some of the details of these mechanisms are known. The present review will provide an overview on the prevalence of beneficial bacteria and the major mechanisms of oral bacterial interactions. Due to the large number of oral bacterial species, only the best characterized species are included in this review.

scholarly journals The Study on the Cultivable Microbiome of the Aquatic Fern Azolla Filiculoides L. as New Source of Beneficial Microorganisms

2019 ◽  
Vol 9 (10) ◽  
pp. 2143 ◽  
Author(s):  
Artur Banach ◽  
Agnieszka Kuźniar ◽  
Radosław Mencfel ◽  
Agnieszka Wolińska
Keyword(s):  
Bacillus Sp ◽  
Beneficial Bacteria ◽  
Growth Promoters ◽  
Azolla Filiculoides ◽  
Anabaena Azollae ◽  
Aquatic Fern ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Indole 3 Acetic Acid ◽  
Microbial Isolates

The aim of the study was to determine the still not completely described microbiome associated with the aquatic fern Azolla filiculoides. During the experiment, 58 microbial isolates (43 epiphytes and 15 endophytes) with different morphologies were obtained. We successfully identified 85% of microorganisms and assigned them to 9 bacterial genera: Achromobacter, Bacillus, Microbacterium, Delftia, Agrobacterium, and Alcaligenes (epiphytes) as well as Bacillus, Staphylococcus, Micrococcus, and Acinetobacter (endophytes). We also studied an A. filiculoides cyanobiont originally classified as Anabaena azollae; however, the analysis of its morphological traits suggests that this should be renamed as Trichormus azollae. Finally, the potential of the representatives of the identified microbial genera to synthesize plant growth-promoting substances such as indole-3-acetic acid (IAA), cellulase and protease enzymes, siderophores and phosphorus (P) and their potential of utilization thereof were checked. Delftia sp. AzoEpi7 was the only one from all the identified genera exhibiting the ability to synthesize all the studied growth promoters; thus, it was recommended as the most beneficial bacteria in the studied microbiome. The other three potentially advantageous isolates (Micrococcus sp. AzoEndo14, Agrobacterium sp. AzoEpi25 and Bacillus sp. AzoEndo3) displayed 5 parameters: IAA (excluding Bacillus sp. AzoEndo3), cellulase, protease, siderophores (excluding Micrococcus sp. AzoEndo14), as well as mineralization and solubilization of P (excluding Agrobacterium sp. AzoEpi25).

scholarly journals Growth promotion and protection from drought in Eucalyptus grandis seedlings inoculated with beneficial bacteria embedded in a superabsorbent polymer

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
José María Chaín ◽  
Esteban Tubert ◽  
Corina Graciano ◽  
Luis Nazareno Castagno ◽  
Marina Recchi ◽  
...  
Keyword(s):  
Water Deficit ◽  
Considerable Increase ◽  
Photosynthetic Capacity ◽  
Growth Promotion ◽  
Abiotic Stress Tolerance ◽  
Eucalyptus Grandis ◽  
Tree Seedlings ◽  
Bacterial Survival ◽  
Beneficial Bacteria ◽  
Growth Promoting

Abstract Eucalyptus grandis is a globally important tree crop. Greenhouse-grown tree seedlings often face water deficit after outplanting to the field, which can affect their survival and establishment severely. This can be alleviated by the application of superabsorbent hydrophilic polymers (SAPs). Growth promoting bacteria can also improve crop abiotic stress tolerance; however, their use in trees is limited, partly due to difficulties in the application and viability loss. In this work, we evaluated the improvement of drought tolerance of E. grandis seedlings by inoculating with two Pseudomonas strains (named M25 and N33), carried by an acrylic-hydrocellulosic SAP. We observed significant bacterial survival in the seedling rhizosphere 50 days after inoculation. Under gradual water deficit conditions, we observed a considerable increase in the water content and wall elasticity of M25-inoculated plants and a trend towards growth promotion with both bacteria. Under rapid water deficit conditions, which caused partial defoliation, both strains significantly enhanced the formation of new leaves, while inoculation with M25 reduced the transpiration rate. Co-inoculation with M25 and N33 substantially increased growth and photosynthetic capacity. We conclude that the selected bacteria can benefit E. grandis early growth and can be easily inoculated at transplant by using an acrylic-hydrocellulosic SAP.

scholarly journals The Metabolic Response of Brachypodium Roots to the Interaction with Beneficial Bacteria Is Affected by the Plant Nutritional Status

Metabolites ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 358
Author(s):  
Martino Schillaci ◽  
Cheka Kehelpannala ◽  
Federico Martinez-Seidel ◽  
Penelope M. C. Smith ◽  
Borjana Arsova ◽  
...  
Keyword(s):  
Nutritional Status ◽  
Metabolic Response ◽  
Phosphorus Deficiency ◽  
Brachypodium Distachyon ◽  
Cereal Crops ◽  
Beneficial Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Phosphorus Levels

The potential of plant growth promoting (PGP) bacteria in improving the performance of plants in suboptimal environments is increasingly acknowledged, but little information is available on the mechanisms underlying this interaction, particularly when plants are subjected to a combination of stresses. In this study, we investigated the effects of the inoculation with the PGP bacteria Azospirillum brasilense (Azospirillum) on the metabolism of the model cereal Brachypodium distachyon (Brachypodium) grown at low temperatures and supplied with insufficient phosphorus. Investigating polar metabolite and lipid fluctuations during early plant development, we found that the bacteria initially elicited a defense response in Brachypodium roots, while at later stages Azospirillum reduced the stress caused by phosphorus deficiency and improved root development of inoculated plants, particularly by stimulating the growth of branch roots. We propose that the interaction of the plant with Azospirillum was influenced by its nutritional status: bacteria were sensed as pathogens while plants were still phosphorus sufficient, but the interaction became increasingly beneficial for the plants as their phosphorus levels decreased. Our results provide new insights on the dynamics of the cereal-PGP bacteria interaction, and contribute to our understanding of the role of beneficial microorganisms in the growth of cereal crops in suboptimal environments.

scholarly journals Comparative Genomic Understanding of Gram-Positive Plant Growth Promoting Leifsonia

2021 ◽  
Author(s):  
Nathan P Nordstedt ◽  
Veronica Roman-Reyna ◽  
Jonathan Michael Jacobs ◽  
Michelle Lyn Jones
Keyword(s):  
Plant Growth ◽  
Stress Tolerance ◽  
Growth Promotion ◽  
In Vitro Assays ◽  
Comparative Genomic ◽  
Beneficial Bacteria ◽  
Water Stress Tolerance ◽  
Vitamin B9 ◽  
Plant Growth Promoting ◽  
Growth Promoting

Root-associated bacteria play critical roles in shaping plant health for abiotic and biotic stress tolerance. The Leifsonia genus includes pathogenic and beneficial bacteria, but limited research is available comparatively across species regarding association with plants. We recently identified the plant growth-promoting Leifsonia sp. C5G2 isolated from the rhizosphere of Plectranthus scutellarioides (coleus) that increased stress tolerance and quality of water-stressed greenhouse ornamentals. Using this beneficial strain as a model, we performed comparative genomics with beneficial, commensal, and pathogenic Leifsonia species to better understand plant association and growth promotion under abiotic stress. Comparative phylogenetic analyses showed that beneficial and commensal Leifsonia spp. clustered separately from pathogenic Leifsonia xyli subsp. xyli. In addition, the beneficial/commensal strains share biosynthetic gene and orthologous protein clusters that are not shared with known phytopathogens in our analysis. The phytopathogenic Leifsonia strains also share noticeably higher percent homology with plant-associated virulence factors in closely-related Clavibacter spp. than the beneficial/commensal strains. Genome analysis supplemented with in vitro assays validated the findings that our model growth-promoting Leifsonia sp. strain C5G2 was highly prolific on diverse carbon sources. This is unlike known fastidious growth behaviors of phytopathogenic Leifsonia. Beneficial Leifsonia sp. C5G2 imparts water stress tolerance in plants, and multiple genes were identified in the genomes of beneficial Leifsonia strains that are potentially involved in bacterial osmotic stress and the production of osmoprotectants and vitamin B9. This work sheds light on the diversity of the genus Leifsonia with a better understanding of potential mechanisms employed by poorly understood beneficial bacteria.

scholarly journals IMPROVING THE QUALITY OF ORNAMENTAL BULBOUS WITH PLANT GROWTH-PROMOTING RHIZOBACTERIA (PGPR)

2021 ◽  
pp. 225-263
Author(s):  
Domenico Prisa ◽  
Alessandra Benati
Keyword(s):  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Root Weight ◽  
Beneficial Bacteria ◽  
Effective Microorganisms ◽  
Soil Microbial ◽  
Potted Plants ◽  
Growing Medium ◽  
Plant Growth Promoting ◽  
Growth Promoting

The aim of this work was to use Plant growth promoting rhizobacteria (PGPR) for the improvement of cultivation and agronomic and pathogen protection characteristics of ornamental bulbous plants such as Tulip (fam. Liliacee), Iris (fam. Iridacee), Freesia (fam. Iridacee) and Narcissus (fam. Amarillidacee). The experiments, started in November 2020, were conducted in the greenhouses of CREA-OF in Pescia (Pt), Tuscany, Italy. The experimental groups were: i) group control irrigated with water and substrate previously fertilized; ii) group with Effective microorganisms irrigated with water and substrate previously fertilized; iii) group with beneficial bacteria (TNC Bactorrs13) irrigated with water and substrate previously fertilized; iv) group with beneficial bacteria (Tarantula powder Advanced nutrients ) irrigated with water and substrate previously fertilized. The trial showed a significant improvement in the agronomic parameters analysed on plants obtained from Narcissus, Iris, Tulip and Freesia bulbs treated with microorganisms. In particular, there was an increase in plant height, vegetative and root weight, bulb weight and diameter, and flower duration. In addition, the use of microorganisms in the growing medium showed a significant increase in the biocontrol of Botrytis cinerea. The treatment with Effective microorganisms (EM) showed the most significant results for all agronomic parameters analysed. The improvement in plant growth brought about by the activity of bacteria is a key aspect of achieving sustainable agricultural goals in the future. More research is needed in this field to identify new soil microbial strains that can be used for the formulation of new products applicable for improving the quality and resistance to biotic and abiotic stresses of potted plants. KEY-WORDS: Ornamental bulbs; Microorganisms; Sustainable agriculture; Flowers; Pot plants

scholarly journals Beneficial Lactiplantibacillus plantarum promote Drosophila growth by down-regulating the expression of PGRP-SC1

2021 ◽  
Author(s):  
Marialaura Gallo ◽  
Justin Vento ◽  
Pauline Joncour ◽  
Andrea Quagliariello ◽  
Elisa Maritan ◽  
...  
Keyword(s):  
Growth And Development ◽  
Transcriptional Response ◽  
Commensal Bacteria ◽  
Beneficial Bacteria ◽  
Host Growth ◽  
Host Genetic ◽  
Growth Promoting ◽  
The Relationship ◽  
Lower Expression

Animals and their commensal bacteria are known to reciprocally influence many traits of their physiology. Specifically, microbes contribute to the maintenance of the immune system homeostasis, improve host digestive processes, and sustain host growth and development. Several studies have reported that such effects result from an intricate network of nutritional, metabolic and immune inputs and partly rely on the capacity of microbes to regulate the host transcriptional response. However, these evidences mainly come from comparing the transcriptional response caused by commensal bacteria with that of axenic animals, making it difficult to identify the specific animal genes that are regulated by beneficial microbes. Here, we employ a well-established model of nutritional symbiosis, Drosophila melanogaster associated with Lactiplantibacillus plantarum, to understand the host genetic pathways regulated by beneficial bacteria and leading to improved host growth and development. Using isogenic L. plantarum strains bearing different growth-promoting effects, we show that the microbial benefit to the host relies on the down-regulation of peptidoglycan- recognition proteins. In particular, we report that the lower expression of PGRP-SC1 exerted by growth-promoting bacteria is responsible for their higher proliferation and the consequent increased production of beneficial metabolites, which ultimately leads to improved host growth and development. Our study helps elucidate the mechanisms underlying the beneficial effect exerted by commensal bacteria, defining the role of PGRP-SC1 in the relationship between Drosophila and its gut microbes.

scholarly journals Accumulation of beneficial bacteria in the rhizosphere of maize (Zea mays L.) grown in a saline soil in responding to a consortium of plant growth promoting rhizobacteria

2021 ◽  
Vol 71 (1) ◽  
Author(s):  
Jieli Peng ◽  
Jia Ma ◽  
Xiaoyan Wei ◽  
Cuimian Zhang ◽  
Nan Jia ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Plant Growth ◽  
Saline Soil ◽  
Plant Growth Promoting Rhizobacteria ◽  
Salt Resistance ◽  
Beneficial Bacteria ◽  
Pgp Traits ◽  
Plant Growth Promoting ◽  
Rhizosphere Bacterial Community ◽  
Growth Promoting

Abstract Purpose Salt stress reduces plant growth and is now becoming one of the most important factors restricting the agricultural productivity. Inoculation of plant growth-promoting rhizobacteria (PGPR) has been shown to confer plant tolerance against abiotic stress, but the detailed mechanisms of how this occurs remain unclear and the application effects in different reports are unstable. In order to obtain a favorite effect of PGPR inoculation and improve our knowledge about the related mechanism, we performed this study to analyze the mechanism of a PGPR consortium on improving the salt resistance of crops. Methods A region-specific (Saline land around Bohai Sea in China) PGPR consortium was selected that contains three strains (Pseudomonas sp. P8, Peribacillus sp. P10, and Streptomyces sp. X52) isolated from rhizosphere of Sonchus brachyotus DC. grown in a saline soil. By inoculation tests, their plant growth-promoting (PGP) traits and ability to improve the salt resistance of maize were investigated and shifting in rhizosphere bacterial community of the inoculated plants was analyzed using the high-throughput sequencing technology. Results The three selected strains were salt tolerant, presented several growth promoting properties, and inhibited several phytopathogenic fungi. The inoculation of this consortium promoted the growth of maize plant and enriched the beneficial bacteria in rhizosphere of maize in a saline soil, including the nitrogen fixing bacteria Azotobacter, Sinorhizobium, and Devosia, and the nitrification bacteria Candidatus Nitrososphaera, and Nitrosovibrio. Conclusions The bacterial consortium P8/P10/X52 could improve plant growth in a saline soil by both their PGP traits and regulating the rhizosphere bacterial community. The findings provided novel information about how the PGPR helped the plants in the view of microbiome.

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