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https://www.readbyqxmd.com/read/28720278/-development-of-a-liquid-fermentation-system-and-encystment-for-a-nitrogen-fixing-bacterium-strain-having-biofertilizer-potential
#1
Mauricio Camelo-Rusinque, Andrés Moreno-Galván, Felipe Romero-Perdomo, Ruth Bonilla-Buitrago
The indiscriminate use of chemical fertilizers has contributed to the deterioration of the biological, physical and chemical properties of the soil, resulting in the loss of its productive capacity. For this reason, the use of biofertilizers has emerged as a technological alternative. The objective of this research was to develop a suitable liquid fermentation system and encystment for the multiplication of Azotobacter chroococcum AC1 strain, a bacterium employed in a biofertilizer formulation produced at present by CARPOICA, Colombia...
July 15, 2017: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/28706529/bacillus-licheniformis-sa03-confers-increased-saline-alkaline-tolerance-in-chrysanthemum-plants-by-induction-of-abscisic-acid-accumulation
#2
Cheng Zhou, Lin Zhu, Yue Xie, Feiyue Li, Xin Xiao, Zhongyou Ma, Jianfei Wang
Soil saline-alkalization is a major abiotic stress that leads to low iron (Fe) availability and high toxicity of sodium ions (Na(+)) for plants. It has recently been shown that plant growth promoting rhizobacteria (PGPR) can enhance the ability of plants to tolerate multiple abiotic stresses such as drought, salinity, and nutrient deficiency. However, the possible involvement of PGPR in improving saline-alkaline tolerance of plants and the underlying mechanisms remain largely unknown. In this study, we investigated the effects of Bacillus licheniformis (strain SA03) on the growth of Chrysanthemum plants under saline-alkaline conditions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28704498/biological-control-of-heterodera-glycines-by-spore-forming-plant-growth-promoting-rhizobacteria-pgpr-on-soybean
#3
Ni Xiang, Kathy S Lawrence, Joseph W Kloepper, Patricia A Donald, John A McInroy
Heterodera glycines, the soybean cyst nematode, is the most economically important plant-parasitic nematode on soybean production in the U.S. The objectives of this study were to evaluate the potential of plant growth-promoting rhizobacteria (PGPR) strains for mortality of H. glycines J2 in vitro and for reducing nematode population density on soybean in greenhouse, microplot, and field trials. The major group causing mortality to H. glycines in vitro was the genus Bacillus that consisted of 92.6% of the total 663 PGPR strains evaluated...
2017: PloS One
https://www.readbyqxmd.com/read/28657581/bacillus-amyloliquefaciens-say09-increases-cadmium-resistance-in-plants-by-activation-of-auxin-mediated-signaling-pathways
#4
Cheng Zhou, Lin Zhu, Zhongyou Ma, Jianfei Wang
Without physical contact with plants, certain plant growth-promoting rhizobacteria (PGPR) can release volatile organic compounds (VOCs) to regulate nutrient acquisition and induce systemic immunity in plants. However, whether the PGPR-emitted VOCs can induce cadmium (Cd) tolerance of plants and the underlying mechanisms remain elusive. In this study, we probed the effects of Bacillus amyloliquefaciens (strain SAY09)-emitted VOCs on the growth of Arabidopsis plants under Cd stress. SAY09 exposure alleviates Cd toxicity in plants with increased auxin biosynthesis...
June 28, 2017: Genes
https://www.readbyqxmd.com/read/28647119/in-vitro-pgpr-properties-and-osmotic-tolerance-of-different-azospirillum-native-strains-and-their-effects-on-growth-of-maize-under-drought-stress
#5
Julia E García, Guillermo Maroniche, Cecilia Creus, Ramón Suárez-Rodríguez, José Augusto Ramirez-Trujillo, María D Groppa
Osmotic variations in the soil can affect bacterial growth diminishing the number of inoculated bacteria. In a scenario of water deficit having tolerant bacteria would be beneficial to achieve a better response of the plant to stress. Thus, selection of more resistant bacteria could be useful to design new inoculants to be used in arid zones. In this sense, a group of Azospirillum isolates deposited in INTA collection was characterized in order to select strains tolerant to osmotic stress. The results obtained demonstrated that Az19 strain has similar in vitro PGPR characteristics to Az39, the most used strain in Argentina for inoculants industries, with the advantage of a better tolerance to osmotic and salt stress...
September 2017: Microbiological Research
https://www.readbyqxmd.com/read/28615734/the-role-of-organic-acids-on-microbial-deterioration-in-the-radix-pseudostellariae-rhizosphere-under-continuous-monoculture-regimes
#6
Hongmiao Wu, Linkun Wu, Quan Zhu, Juanying Wang, Xianjin Qin, Jiahui Xu, Lufei Kong, Jun Chen, Sheng Lin, Muhammad Umar Khan, Hira Amjad, Wenxiong Lin
A three-year field monoculture trial of Radix pseudostellariae and complementary laboratory studies were conducted to further elucidate the underlying mechanism responsible for significant decreases in the biomass yield and quality of R. pseudostellariae under continuous monoculture regimes. HPLC analysis indicated that continuous monoculture soil was rich in organic acids, which had cumulative effects over time. Further analysis suggested that the application of a mixture of organic acids significantly promoted growth of pathogenic fungi, and increased the expression of chemotaxis-related gene (cheA) and biofilm formation of the specific pathogenic Kosakonia sacchari...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28593515/cu-resistant-kocuria-sp-crb15-a-potential-pgpr-isolated-from-the-dry-tailing-of-rakha-copper-mine
#7
Arti Hansda, Vipin Kumar, Anshumali
Rhizobacteria may enhance biomass production and heavy metal tolerance of plants under stress conditions. The present study was carried out for isolation of metal-resistant bacteria that can be further utilized for phytoremediation process. A potential metal-resistant strain CRB15 was isolated from rhizospheric region of Saccharum spontaneum that was found to be resistant against Cu (6.29 mM), Zn (3.25 mM), Pb (1.5 mM), Ni (1.25 mM), and Cd (0.25 mM). SEM analysis was performed for evaluation of morphological changes on bacterial isolate...
June 2017: 3 Biotech
https://www.readbyqxmd.com/read/28549372/pgpr-strain-paenibacillus-polymyxa-sqr-21-potentially-benefits-watermelon-growth-by-re-shaping-root-protein-expression
#8
Yaoyao E, Jun Yuan, Fang Yang, Lei Wang, Jinghua Ma, Jing Li, Xiaowei Pu, Waseem Raza, Qiwei Huang, Qirong Shen
Paenibacillus polymyxa (SQR-21) is not only a plant growth-promoting rhizobacteria, but also an effective biocontrol agent against Fusarium wilt disease of watermelon. For the better understanding and clarifying the potential mechanisms of SQR-21 to improve watermelon growth and disease resistance, a split-root methodology in hydroponic and LC-MS technology with the label free method was used to analyze the key root proteins involved in watermelon metabolism and disease resistance after the inoculation of SQR-21...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28542542/comparative-analysis-of-bacterial-community-structure-in-the-rhizosphere-of-maize-by-high-throughput-pyrosequencing
#9
Yi Yang, Na Wang, Xinyan Guo, Yi Zhang, Boping Ye
In this study, we designed a microcosm experiment to explore the composition of the bacterial community in the rhizosphere of maize and bulk soil by sequencing the V3-V4 region of the 16S rRNA gene on the Illumina system. 978-1239 OTUs (cut off level of 3%) were found in rhizosphere and bulk soil samples. Rhizosphere shared features with the bulk soil, such as predominance of Acidobacteria, Proteobacteria, Actinobacteria, Bacteroidetes, Chloroflexi, Firmicutes, Gemmatimonadetes and TM7. At genus level, many of the dominant rhizosphere genera (Chitinophaga, Nitrospira, Flavobacterium, etc...
2017: PloS One
https://www.readbyqxmd.com/read/28500403/nanochitosan-supports-growth-of-zea-mays-and-also-maintains-soil-health-following-growth
#10
Priyanka Khati, Parul Chaudhary, Saurabh Gangola, Pankaj Bhatt, Anita Sharma
The present study evaluated the effect of nanochitosan in combination with plant growth promoting rhizobacteria (PGPR), PS2 and PS10 on maize growth. The PGPR were earlier recognized as Bacillus spp. on the basis of 16S rDNA sequencing. The observation revealed enhanced plant health parameters like seed germination (from 60 to 96.97%), plant height (1.5-fold increase), and leaf area (twofold). Variability in different physicochemical parameters (pH, oxidizable organic carbon, available phosphorous, available potassium, ammoniacal nitrogen and nitrate nitrogen) was observed...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28489199/compatibility-of-azospirillum-brasilense-and-pseudomonas-fluorescens-in-growth-promotion-of-groundnut-arachis-hypogea-l
#11
Andhare A Prasad, Subramanian Babu
We attempted to study the compatibility among plant beneficial bacteria in the culture level by growing them near in the nutrient agar plates. Among all the bacteria tested, Rhizobium was found to inhibit the growth of other bacteria. From the compatible group of PGPR, we have selected one biofertilizer (Azospirillum brasilense strain TNAU) and one biocontrol agent (Pseudomonas fluorescens strain PF1) for further studies in the pot culture. We have also developed a bioformulation which is talc powder based, for individual bacteria and mixed culture...
May 2, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28472087/beneficial-rhizobacteria-immobilized-in-nanofibers-for-potential-application-as-soybean-seed-bioinoculants
#12
Priscilla Romina De Gregorio, Gabriela Michavila, Lenise Ricciardi Muller, Clarissa de Souza Borges, María Fernanda Pomares, Enilson Luiz Saccol de Sá, Claudio Pereira, Paula Andrea Vincent
Seed inoculation with plant growth promoting rhizobacteria (PGPR) is an ideal tool to supply the soil with a high density of beneficial microorganisms. However, maintaining viable microorganisms is a major problem during seed treatment and storage. In this work, an evaluation was made of the effect of bacterial immobilization in nanofibers on the stability (viability and maintenance of beneficial properties) of two potential PGPR, Pantoea agglomerans ISIB55 and Burkholderia caribensis ISIB40. Moreover, the impact of soybean seed coating with nanofiber-immobilized rhizobacteria on bacterial survival during seed storage and on germination and plant growth parameters was determined...
2017: PloS One
https://www.readbyqxmd.com/read/28457004/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
#13
Anastasia S Pavlova, Maria R Leontieva, Tatiana A Smirnova, Galina L Kolomeitseva, Alexander I Netrusov, Elena A Tsavkelova
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 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...
April 29, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28440700/selection-and-assessment-of-plant-growth-promoting-rhizobacteria-for-biological-control-of-multiple-plant-diseases
#14
Ke Liu, Molli Newman, John A McInroy, Chia-Hui Hu, Joseph W Kloepper
A study was designed to screen individual strains of plant growth-promoting rhizobacteria (PGPR) for broad-spectrum disease suppression in vitro and in planta. In a preliminary screen, 28 of 196 strains inhibited eight different tested pathogens in vitro. In a secondary screen, these 28 strains showed broad spectrum antagonistic activity to six different genera of pathogens, and 24 of the 28 strains produced five traits reported to be related to plant growth promotion, including nitrogen fixation, phosphate solubilization, indole-3-acetic acid production, siderophore production, and biofilm formation...
August 2017: Phytopathology
https://www.readbyqxmd.com/read/28436040/synergistic-use-of-biochar-compost-and-plant-growth-promoting-rhizobacteria-for-enhancing-cucumber-growth-under-water-deficit-conditions
#15
Sajid M Nadeem, Muhammad Imran, Muhammad Naveed, Muhammad Y Khan, Maqshoof Ahmad, Zahir A Zahir, David E Crowley
BACKGROUND: Limited information is available about effectiveness of biochar with plant growth promoting rhizobacteria (PGPR) and compost. A greenhouse study was conducted to evaluate the effect of biochar in combination with compost and PGPR (Pseudomonas fluorescens) for alleviating water deficit stress. The inoculated and un-inoculated cucumber seeds were sown in soil treated with biochar, compost and biochar + compost. Three water levels [field capacity (D0), 75% field capacity (D1) and 50% field capacity (D2)] were maintained...
April 23, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28397264/population-densities-of-indigenous-acidobacteria-change-in-the-presence-of-plant-growth-promoting-rhizobacteria-pgpr-in-rhizosphere
#16
Sadaf Kalam, Subha Narayan Das, Anirban Basu, Appa Rao Podile
Rhizosphere microbial community has diverse metabolic capabilities and plays a crucial role in maintaining plant health. Oligotrophic plant growth promoting rhizobacteria (PGPR), along with difficult-to-culture microbial fractions, might be involved synergistically in microbe-microbe and plant-microbe interactions in the rhizosphere. Among the difficult-to-culture microbial fractions, Acidobacteria constitutes the most dominant phylum thriving in rhizospheric soils. We selected effective PGPR for tomato and black gram and studied their effect on population densities of acidobacterial members...
April 11, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28330071/unexpected-formation-of-n-phenyl-thiophosphorohydrazidic-acid-o-s-dimethyl-ester-from-acephate-chemical-biotechnical-and-computational-study
#17
Vijay Kumar, Sukhmanpreet Kaur, Simranjeet Singh, Niraj Upadhyay
By the nucleophilic attack of phenylhydrazine on acephate in aqueous medium, a stable product N'-phenyl-thiophosphorohydrazidic acid O,S-dimethyl ester (1) was obtained and characterized by elemental, spectral and thermal analysis. Thermodynamic parameters, Ea, ΔH°, ΔS° and ΔG°, have found to be 62.15, -67.95, -0.068 and -20.05 kJ mol(-1) according to the Coats-Redfern equation. Analysis of interaction of 1 with BSA protein was done by using the UV-Vis and FTIR spectroscopic methods. The observed binding constants was 1...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28326066/beneficial-microorganisms-for-corals-bmc-proposed-mechanisms-for-coral-health-and-resilience
#18
REVIEW
Raquel S Peixoto, Phillipe M Rosado, Deborah Catharine de Assis Leite, Alexandre S Rosado, David G Bourne
The symbiotic association between the coral animal and its endosymbiotic dinoflagellate partner Symbiodinium is central to the success of corals. However, an array of other microorganisms associated with coral (i.e., Bacteria, Archaea, Fungi, and viruses) have a complex and intricate role in maintaining homeostasis between corals and Symbiodinium. Corals are sensitive to shifts in the surrounding environmental conditions. One of the most widely reported responses of coral to stressful environmental conditions is bleaching...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28291380/beneficial-rhizobacterium-bacillus-amyloliquefaciens-sqr9-induces-plant-salt-tolerance-through-spermidine-production
#19
Lin Chen, Yunpeng Liu, Gengwei Wu, Nan Zhang, Qirong Shen, Ruifu Zhang
The inoculation of plants with plant-growth-promoting rhizobacterium has been an effective strategy for enhancing plant salt tolerance to diminish the loss of agricultural productivity caused by salt stress; however, the signal transmitted from bacteria to the plant under salt stress is poorly understood. In this study, the salt tolerance of Arabidopsis thaliana and Zea mays was enhanced by inoculation with Bacillus amyloliquefaciens SQR9. Using dialysis bags with different molecular weight cutoffs, we sorted through the molecules secreted by SQR9 and found that spermidine is responsible for enhancing plant salt tolerance...
May 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28290277/influence-of-rice-bran-stearin-on-stability-properties-and-encapsulation-efficiency-of-polyglycerol-polyricinoleate-pgpr-stabilized-water-in-rice-bran-oil-emulsions
#20
Nattapong Prichapan, David Julian McClements, Utai Klinkesorn
In the present study, rice bran stearin was used to improve the physical stability and encapsulation efficiency of water-in-oil (W/O) emulsions fabricated from rice bran oil and polyglycerol polyricinoleate ester (PGPR). In the absence of rice bran stearin, the emulsions were highly unstable to phase separation with an oil layer forming on their surfaces. Phase separation was delayed by increasing the PGPR concentration because this reduced the water droplet size. Phase separation could be completely inhibited by replacement of 30 to 45wt% of rice bran oil with rice bran stearin due to the formation of a semi-solid fat crystal network that prevented droplet movement...
March 2017: Food Research International
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