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G Dąbrowska, K Hrynkiewicz, A Trejgell, C Baum
The test strains Bacteroidetes bacterium (Ba), Pseudomonas fluorescens (Pf) and Variovorax sp. (Va) were selected in advance for their in vitro capability for growth promotion of rapeseed in the presence of increased concentrations of Cd, Cu, Pb and Zn in the medium. In the pot experiment the strains were used for single Ba, Pf, Va or combined Ba+Pf, Ba+Va, Pf+Va, Ba+Pf+Va inoculation of B. napus growing in contaminated soil from alluvial deposits. The positive effect of bacterial strains on plant growth was observed in vitro, but was not confirmed in situ in the contaminated soil, where the tested strains inhibited biomass production, rather than stimulating it...
October 14, 2016: International Journal of Phytoremediation
Nidhi Bharti, Shiv Shanker Pandey, Deepti Barnawal, Vikas Kumar Patel, Alok Kalra
Plant growth promoting rhizobacteria (PGPR) hold promising future for sustainable agriculture. Here, we demonstrate a carotenoid producing halotolerant PGPR Dietzia natronolimnaea STR1 protecting wheat plants from salt stress by modulating the transcriptional machinery responsible for salinity tolerance in plants. The expression studies confirmed the involvement of ABA-signalling cascade, as TaABARE and TaOPR1 were upregulated in PGPR inoculated plants leading to induction of TaMYB and TaWRKY expression followed by stimulation of expression of a plethora of stress related genes...
October 6, 2016: Scientific Reports
Shanshan Xie, Haoyu Zang, Huijun Wu, Uddin Rajer Faheem, Xuewen Gao
Recent investigations have demonstrated that bacteria employ the volatile compounds they produce during interactions with other organisms such as plants, fungi, nematodes and bacteria. However, studies focused on the antibacterial activity of plant growth promoting rhizobacteria (PGPR) volatiles against bacterial phytopathogens are still rare. In this study, Bacillus strain D13, which is antagonistic to Xanthomonas oryzae pv. oryzae (Xoo), was isolated and screened. Volatile compounds emitted from strain D13 reduced the colony diameter and cell motility of Xoo cultured in divided Petri plates...
September 29, 2016: Molecular Plant Pathology
Matheus A P Cipriano, Manoeli Lupatini, Lucilene Lopes-Santos, Márcio J da Silva, Luiz F W Roesh, Suzete A L Destéfano, Sueli S Freitas, Eiko E Kuramae
Plant growth promoting rhizobacteria (PGPR) are well described and recommended for several crops worldwide. However, one of the most common problems in PGPR research is the difficulty in obtaining reproducible results. Furthermore, few studies have evaluated plant growth promotion and soil microbial community composition due to bacterial inoculation under field conditions. Here we evaluated the effect of 54 Pseudomonas strains on lettuce (Lactuca sativa) growth. The 12 most promising strains were phylogenetically and physiologically characterized for plant growth-promoting traits including phosphate solubilization, hormone production and antagonism to pathogen compounds and their effect on plant growth under farm field conditions...
September 21, 2016: FEMS Microbiology Ecology
Juliana Melo, Manuela Carolino, Luís Carvalho, Patrícia Correia, Rogério Tenreiro, Sandra Chaves, Ana I Meleiro, Sávio B de Souza, Teresa Dias, Cristina Cruz, Alessandro C Ramos
Crop management systems influence plant productivity and nutrient use efficiency, as well as plant growth-promoting rhizobacteria (PGPR), which are known to influence the growth of plants via phytohormone production, phosphate solubilization, nitrogen (N) fixation and antimicrobial activity. The objective of this study was to compare the influence of two crop management system on microbial PGPR features. PGPR isolated from the rhizospheres of Carica papaya L. grown under two distinct management systems (conventional and organic) were identified and characterized...
2016: SpringerPlus
Dana Luminița Sobariu, Daniela Ionela Tudorache Fertu, Mariana Diaconu, Lucian Vasile Pavel, Raluca-Maria Hlihor, Elena Niculina Drăgoi, Silvia Curteanu, Markus Lenz, Philippe François-Xavier Corvini, Maria Gavrilescu
Certain species of plants can benefit from synergistic effects with plant growth-promoting rhizobacteria (PGPR) that improve plant growth and metal accumulation, mitigating toxic effects on plants and increasing their tolerance to heavy metals. The application of PGPR as biofertilizers and atmospheric nitrogen fixators contributes considerably to the intensification of the phytoremediation process. In this paper, we have built a system consisting of rhizospheric Azotobacter microbial populations and Lepidium sativum plants, growing in solutions containing heavy metals in various concentrations...
September 9, 2016: New Biotechnology
Kuldeep Singh Jadon, Rakesh Shah, Hari Narayan Gour, Pankaj Sharma
Sweet or bell pepper is a member of the Solanaceae family and is regarded as one of the most popular and nutritious vegetable. Blight, in the form of leaf and fruit blight, has been observed to infect bell pepper crops cultivated at the horticulture farm in Rajasthan College of Agriculture, Udaipur, India. Based on disease severity, we attempted to curb this newly emerged problem using different fungicides, plant extracts, bio-control agents, and commercial botanicals against the fungus in laboratory and pot experiments...
October 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
Jordan Vacheron, Yvan Moënne-Loccoz, Audrey Dubost, Maximilien Gonçalves-Martins, Daniel Muller, Claire Prigent-Combaret
Plant Growth-Promoting Rhizobacteria (PGPR) enhance plant health and growth using a variety of traits. Effective PGPR strains typically exhibit multiple plant-beneficial properties, but whether they are better adapted to the rhizosphere than PGPR strains with fewer plant-beneficial properties is unknown. Here, we tested the hypothesis that strains with higher numbers of plant-beneficial properties would be preferentially selected by plant roots. To this end, the co-occurrence of 18 properties involved in enhanced plant nutrition, plant hormone modulation, or pathogen inhibition was analyzed by molecular and biochemical methods in a collection of maize rhizosphere and bulk soil isolates of fluorescent Pseudomonas...
2016: Frontiers in Plant Science
Iti Gontia-Mishra, Swapnil Sapre, Anubha Sharma, Sharad Tiwari
RATIONALE: Drought stress adversely affects the growth and yield of wheat. The present study was planned to investigate the effect of inoculation of plant-growth promoting rhizobacteria (PGPR) strains IG 3 (Klebsiella sp.), IG 10 (Enterobacter ludwigii) and IG 15 (Flavobacterium sp.) in improving drought tolerance in wheat. METHODS: These PGPR strains were screened for drought tolerance in nutrient broth supplemented with different concentrations (0-25%) of polyethylene glycol (PEG6000)...
September 8, 2016: Plant Biology
Hongjun Liu, Dandan Chen, Ruifu Zhang, Xinnan Hang, Rong Li, Qirong Shen
High-quality bio-organic fertilizers (BIOs) cannot be produced without the addition of some proteins. In this study, compound liquid amino acids (CLAA) from animal carcasses were utilized as additives into matured composts to create novel BIOs containing plant growth-promoting rhizobacteria (PGPR). The results showed that adding CLAA and inoculating bacteria meanwhile resulted in failed solid-state fermentation (SSF) due to the higher H(+) contents. While after pre-compost for 4 days before PGPR inoculation, treatments of matured chicken or pig manure added with 0...
2016: Frontiers in Microbiology
L Benidire, S I A Pereira, P M L Castro, A Boularbah
Soil heavy metal contamination resulting from mining activities constitutes a major environmental problem worldwide. The spread of heavy metals is often facilitated by scarce vegetation cover, so there is an urgent need to improve plant survival and establishment in these metalliferous areas. This study is aimed at the isolation and analysis of the phylogenetic relationship of culturable bacteria from the rhizosphere of metallophyte plants growing in the Kettara mine, in Marrakech, in order to select plant growth-promoting rhizobacteria (PGPR), which could be used in assisted-phytoremediation...
August 13, 2016: Environmental Science and Pollution Research International
Hai-Ting Hao, Xia Zhao, Qian-Han Shang, Yun Wang, Zhi-Hong Guo, Yu-Bao Zhang, Zhong-Kui Xie, Ruo-Yu Wang
Some plant growth-promoting rhizobacteria (PGPR) regulated plant growth and elicited plant basal immunity by volatiles. The response mechanism to the Bacillus amyloliquefaciens volatiles in plant has not been well studied. We conducted global gene expression profiling in Arabidopsis after treatment with Bacillus amyloliquefaciens FZB42 volatiles by Illumina Digital Gene Expression (DGE) profiling of different growth stages (seedling and mature) and tissues (leaves and roots). Compared with the control, 1,507 and 820 differentially expressed genes (DEGs) were identified in leaves and roots at the seedling stage, respectively, while 1,512 and 367 DEGs were identified in leaves and roots at the mature stage...
2016: PloS One
Cecilia Rodriguez-Furlán, Hernán Salinas-Grenet, Omar Sandoval, Camilo Recabarren, Paulina Arraño-Salinas, Sylvana Soto-Alvear, Ariel Orellana, Francisca Blanco-Herrera
Root hairs are important for nutrient and water uptake and are also critically involved the interaction with soil inhabiting microbiota. Root hairs are tubular-shaped outgrowths that emerge from trichoblasts. This polarized elongation is maintained and regulated by a robust mechanism involving the endomembrane secretory and endocytic system. Members of the syntaxin family of SNAREs (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) in plants (SYP), have been implicated in regulation of the fusion of vesicles with the target membranes in both exocytic and endocytic pathways...
2016: Frontiers in Plant Science
Manel Chiboub, Omar Saadani, Imen Challougui Fatnassi, Souhir Abdelkrim, Ghassen Abid, Moez Jebara, Salwa Harzalli Jebara
The inoculation of plants with plant-growth-promoting rhizobacteria has become a priority in the phytoremediation of heavy-metal-contaminated soils. A total of 82 bacteria were isolated from Sulla coronaria root nodules cultivated on four soil samples differently contaminated by heavy metals. The phenotypic characterization of these isolates demonstrated an increased tolerance to cadmium reaching 4.1mM, and to other metals, including Zn, Cu and Ni. Polymerase Chain Reaction/Restriction Fragment Length Polymorphism (PCR/RFLP) analysis showed a large diversity represented by genera related to Agrobacterium sp...
September 2016: Comptes Rendus Biologies
Maricel V Santoro, Pablo C Bogino, Natalia Nocelli, Lorena Del Rosario Cappellari, Walter F Giordano, Erika Banchio
Many species or strains of the genus Pseudomonas have been characterized as plant growth promoting rhizobacteria (PGPR). We used a combination of phenotypic and genotypic techniques to analyze the community of fluorescent Pseudomonas strains in the rhizosphere of commercially grown Mentha piperita (peppermint). Biochemical techniques, Amplified rDNA Restriction Analysis (ARDRA), and 16S rRNA gene sequence analysis revealed that the majority of the isolated native fluorescent strains were P. putida. Use of two Repetitive Sequence-based PCR (rep-PCR) techniques, BOX-PCR and ERIC-PCR, allowed us to evaluate diversity among the native strains and to more effectively distinguish among them...
2016: Frontiers in Microbiology
Dania Israr, Ghulam Mustafa, Khalid Saifullah Khan, Muhammad Shahzad, Niaz Ahmad, Sajid Masood
Phosphorus (P) availability in alkaline soils of arid and semi-arid regions is a major constraint for decreased crop productivity. Use of plant growth promoting rhizobacteria (PGPR) may enhance plant growth through the increased plant antioxidation activity. Additionally, PGPR may increase nutrient uptake by plants as a result of induced root exudation and rhizosphere acidification. The current study was aimed to investigate combined effects of P and Pesudomonas putida (PGPR) on chickpea growth with reference to antioxidative enzymatic activity and root exudation mediated plant nutrient uptake, particularly P...
July 26, 2016: Plant Physiology and Biochemistry: PPB
R Mala, A S Ruby Celsia, S Vidhya Bharathi, S Raja Blessina, Uma Maheswari
BACKGROUND: The excessive use of fertilizers and pesticides has distorted soil composition, fertility and integ-rity with relevant and non-desirable environmental and ecological consequences. A strategy was designed to prepare a nano structured slow release fertilizer system that delivers nutrients and plant growth promoting Rhizobacteria simultaneously. Slow release nano phosphate and potash fertilizer was prepared by blending the nano emulsion of fertilizer with neem cake and PGPR. METHODS: The influence of nano structured slow release fertilizer on the biochemical characteristics, soil and yield attributes of Vigna radiata was studied in the field by randomized block design...
July 26, 2016: Recent Patents on Nanotechnology
Anukool Vaishnav, Sarita Kumari, Shekhar Jain, Ajit Varma, Narendra Tuteja, Devendra Kumar Choudhary
Increasing evidence shows that nitric oxide (NO), a typical signaling molecule plays important role in development of plant and in bacteria-plant interaction. In the present study, we tested the effect of sodium nitroprusside (SNP)-a nitric oxide donor, on bacterial metabolism and its role in establishment of PGPR-plant interaction under salinity condition. In the present study, we adopted methods namely, biofilm formation assay, GC-MS analysis of bacterial volatiles, chemotaxis assay of root exudates (REs), measurement of electrolyte leakage and lipid peroxidation, and quantitative reverse transcription-polymerase chain reaction (qRT-PCR) for gene expression...
July 21, 2016: Journal of Basic Microbiology
Ida Idayu Muhamad, Chang Hui Quin, Suguna Selvakumaran
The purpose of this study was to investigate the preparation of formulated water- in-soybean oil-in-water emulsions by repeated premix membrane emulsification method using a cellulose acetate membrane. The effect of selective membrane emulsification process parameters (concentration of the emulsifiers, number of passes of the emulsions through the membrane and storage temperature) on the properties and stability of the developed emulsions were also investigated. 1, 3, 6, 8-pyrenetetrasulfonic acid tetrasodium salt (PTSA) was used as a hydrophilic model ingredient for the encapsulation of bioactive substances...
April 2016: Journal of Food Science and Technology
Wesley M Rangel, Sofie Thijs, Jolien Janssen, Silvia M Oliveira Longatti, Daiane S Bonaldi, Paula R Ribeiro, Inge Jambon, Nele Eevers, Nele Weyens, Jaco Vangronsveld, Fatima M S Moreira
Plants on contaminated mining soils often show a reduced growth due to nutrient depletion as well as trace elements (TE) toxicity. Since those conditions threat plant's survival, plant growth promoting rhizobacteria (PGPR) such as rhizobia, might be of crucial importance for plant colonization on TE contaminated soils. Native rhizobia from mining soils are promising candidates for bioaugmented phytoremediation of those soils as they are adapted to the specific conditions. In this work, rhizobia from Zn- and Cd-contaminated mining soils were in vitro screened for their plant growth promoting features (organic acids, indole-3-acetic-acid and siderophore production, 1-aminocyclopropane-1-carboxylate deaminase activity, and Ca3(PO4)2 solubilization) and Zn- and Cd-resistance...
July 13, 2016: International Journal of Phytoremediation
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