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Nasim Ahmad Yasin, Waheed Ullah Khan, Sajid Rashid Ahmad, Aamir Ali, Aqeel Ahmad, Waheed Akram
The salinity stress causes a major threat for plant growth, yield, and biomass production. The present study was designed to assess the effect of exogenously applied kinetin and halotolerant plant growth-promoting rhizobacteria (H-PGPR) on alleviation of salt stress in black gram (Phaseolus mungo). A total of 15 rhizobacterial isolates obtained from a salt-affected area were analyzed for their capability to improve growth of P. mungo plants growing in greenhouse conditions. Out of the tested rhizobacteria, the two bacterial isolates which exhibited maximum growth potential were screened and their growth-promoting attributes were evaluated...
November 28, 2017: Environmental Science and Pollution Research International
Alejandro Pérez-de-Luque, Stefanie Tille, Irene Johnson, David Pascual-Pardo, Jurriaan Ton, Duncan D Cameron
Belowground interactions between plant roots, mycorrhizal fungi and plant growth-promoting rhizobacteria (PGPR) can improve plant health via enhanced nutrient acquisition and priming of the plant immune system. Two wheat cultivars differing in their ability to form mycorrhiza were (co)inoculated with the mycorrhizal fungus Rhizophagus irregularis and the rhizobacterial strain Pseudomonas putida KT2440. The cultivar with high mycorrhizal compatibility supported higher levels of rhizobacterial colonization than the low compatibility cultivar...
November 27, 2017: Scientific Reports
Afroz Rais, Zahra Jabeen, Faluk Shair, Fauzia Yusuf Hafeez, Muhammad Nadeem Hassan
Plant growth promoting rhizobacteria (PGPR) are found to control the plant diseases by adopting various mechanisms. Induced systemic resistance (ISR) is an important defensive strategy manifested by plants against numerous pathogens especially infecting at aerial parts. Rhizobacteria elicit ISR by inducing different pathways in plants through production of various metabolites. In the present study, potential of Bacillus spp. KFP-5, KFP-7, KFP-17 was assessed to induce antioxidant enzymes against Pyricularia oryzae infection in rice...
2017: PloS One
Swapnil Sapre, Iti Gontia-Mishra, Sharad Tiwari
Plant growth and yield is adversely affected by soil salinity. Salt tolerant plant growth-promoting rhizobacteria (PGPR) strain IG 3 was isolated from rhizosphere of wheat plants. The isolate IG 3 was able to grow in presence of NaCl ranging from 0 to 20% in Luria Bertani medium. The present study was planned to evaluate the role of inoculation of PGPR strain IG 3 and its efficacy in augmenting salt tolerance in oat (Avena sativa) under NaCl stress (100mM). The physiological parameter such as shoot length, root length, shoot dry weight, root dry weight and relative water content (RWC) were remarkably higher in IG 3 inoculated plants in comparison to un-inoculated plants under NaCl stress...
January 2018: Microbiological Research
Sushanto Gouda, Rout George Kerry, Gitishree Das, Spiros Paramithiotis, Han-Seung Shin, Jayanta Kumar Patra
The progression of life in all forms is not only dependent on agricultural and food security but also on the soil characteristics. The dynamic nature of soil is a direct manifestation of soil microbes, bio-mineralization, and synergistic co-evolution with plants. With the increase in world's population the demand for agriculture yield has increased tremendously and thereby leading to large scale production of chemical fertilizers. Since the use of fertilizers and pesticides in the agricultural fields have caused degradation of soil quality and fertility, thus the expansion of agricultural land with fertile soil is near impossible, hence researchers and scientists have sifted their attention for a safer and productive means of agricultural practices...
January 2018: Microbiological Research
Dalia Molina-Romero, Antonino Baez, Verónica Quintero-Hernández, Miguel Castañeda-Lucio, Luis Ernesto Fuentes-Ramírez, María Del Rocío Bustillos-Cristales, Osvaldo Rodríguez-Andrade, Yolanda Elizabeth Morales-García, Antonio Munive, Jesús Muñoz-Rojas
Plant growth-promoting rhizobacteria (PGPR) increase plant growth and crop productivity. The inoculation of plants with a bacterial mixture (consortium) apparently provides greater benefits to plant growth than inoculation with a single bacterial strain. In the present work, a bacterial consortium was formulated containing four compatible and desiccation-tolerant strains with potential as PGPR. The formulation had one moderately (Pseudomonas putida KT2440) and three highly desiccation-tolerant (Sphingomonas sp...
2017: PloS One
Gayathri Ilangumaran, Donald L Smith
Salinity affects plant growth and is a major abiotic stress that limits crop productivity. It is well-understood that environmental adaptations and genetic traits regulate salinity tolerance in plants, but imparting the knowledge gained towards crop improvement remain arduous. Harnessing the potential of beneficial microorganisms present in the rhizosphere is an alternative strategy for improving plant stress tolerance. This review intends to elucidate the understanding of salinity tolerance mechanisms attributed by plant growth promoting rhizobacteria (PGPR)...
2017: Frontiers in Plant Science
Ahmed Ali Romeh, Mohamed Yousef Hendawi
Fenamiphos is a systematic nematicide-insecticide used extensively for the control of soil nematodes. Fenamiphos and oxidation products have been known to induce water pollution, soil pollution and ecotoxicological effects on aquatic organisms, as well as heath issues. This contaminant can be removed by phytoremediation. Herein, we tested several strategies to improve the effectiveness of this technology. A combination of G. max plus Pseudomonas fluorescens was more efficient than G. max plus Serratia marcescens or G...
October 2017: Pesticide Biochemistry and Physiology
Shanshan Xie, Haiyang Jiang, Ting Ding, Qianqian Xu, Wenbo Chai, Beijiu Cheng
Bacillus amyloliquefaciens FZB42 is a kind of plant-growth-promoting rhizobacteria (PGPR) that activates induced systemic resistance (ISR) in Arabidopsis. Blocking in cyclic lipopeptides and 2,3-butanediol synthesis of FZB42, which were proved to be involved in priming ISR, resulted in abolishment of plant defense responses. To further clarify the ISR activated by PGPR at miRNA level, sRNA libraries from Arabidopsis leaves after root-irrigated with FZB42, FZB42ΔsfpΔalsS and control were constructed and sequenced...
November 1, 2017: Molecular Plant Pathology
Vijay Kumar, Simranjeet Singh, Rohit Singh, Niraj Upadhyay, Joginder Singh
The present study was designed to synthesize the bioactive molecule 2,2-bis(2,4-dinitrophenyl)-2-(phosphonatomethylamino)acetate (1), having excellent applications in the field of plant protection as a herbicide. Structure of newly synthesized molecule 1 was confirmed by using the elemental analysis, mass spectrometric, NMR, UV-visible, and FTIR spectroscopic techniques. To obtain better structural insights of molecule 1, 3D molecular modeling was performed using the GAMESS programme. Microbial activities of 1 were checked against the pathogenic strains Aspergillus fumigatus (NCIM 902) and Salmonella typhimurium (NCIM 2501)...
October 2017: Journal of Chemical Biology
Rajnish P Singh, Prabhat N Jha
Certain plant growth promoting bacteria have ability to ameliorate abiotic and/or biotic stressors, which can be exploited to enhance plant growth and productivity of the plants under stress conditions. Therefore, the present study aimed to examine the role of a rhizospheric bacterial isolate SBP-9 isolated from Sorghum bicolor (i) in promoting the wheat plant growth under salinity stress, and (ii) in enhancing the defense response in wheat against fungal pathogen "Fusarium graminearum." The test isolate possessed plant growth promoting (PGP) traits including ACC deaminase (ACCD), gibberellic acid, indole acetic acid (IAA), siderophore, and inorganic phosphate solubilization...
2017: Frontiers in Microbiology
Dilfuza Egamberdieva, Kakhramon Davranov, Stephan Wirth, Abeer Hashem, Elsayed Fathi Abd Allah
The effectiveness of plant growth - promoting bacteria is variable under different biotic and abiotic conditions. Abiotic factors may negatively affect the beneficial properties and efficiency of the introduced PGPR inoculants. The aim of this study was to evaluate the effect of plant growth - promoting rhizobacteria on plant growth and on the control of foot and root rot of tomatoes caused by Fusarium solani under different soil salinity conditions. Among the five tested strains, only Pseudomonas chlororaphis TSAU13, and Pseudomonas extremorientalis TSAU20 were able to stimulate plant growth and act as biological controls of foot and root rot disease of tomato...
November 2017: Saudi Journal of Biological Sciences
Azareel Angulo-Castro, Ronald Ferrera-Cerrato, Alejandro Alarcón, Juan José Almaraz-Suárez, Julián Delgadillo-Martínez, Maribel Jiménez-Fernández, Oscar García-Barradas
Plant growth promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungi (AMF) are a biological alternative for the sustainable management of Capsicum annuum L. This research work evaluated the effects of both PGPR and AMF on bell pepper and jalapeno pepper plants. Five bacterial strains isolated from several locations in Estado de Mexico were used: [P61 (Pseudomonas tolaasii), A46 (P. tolaasii), R44 (Bacillus pumilus), BSP1.1 (Paenibacillus sp.), and OLs-Sf5 (Pseudomonas sp.)], and three treatments with AMF [H1 (consortium isolated from pepper crops in the State of Puebla), H2 (Rhizophagus intraradices), and H3 (consortium isolated from the rhizosphere of lemon trees, State of Tabasco)]...
October 17, 2017: Revista Argentina de Microbiología
Junji Matsuoka, Takumi Kusano, Yuuki Kasama, Etsuko Tominaga, Junya Kobayashi, Wataru Fujii, Hiroki Iwase, Mitsuhiro Shibayama, Hironobu Nanbu
The structures of micelles and microemulsions consisting of polyglycerol polyricinoleate (PGPR) were investigated by small-angle X-ray scattering (SAXS) and rheological measurements. The SAXS results show that amphiphilic PGPR molecules form stable micelles in glycerol. When vitamin E is added to the PGPR micelles, it is encapsulated in the micelles and forms an emulsion. These micelles are stable towards mechanical shearing up to a shear rate of 1000 s(-1), with shear thinning occurring in the emulsion above 100 s(-1), indicating that the emulsion may undergo break up by shearing, but recovers the structure by releasing shear strain...
October 11, 2017: Journal of Oleo Science
Muhammad Javed Akhtar, Sana Ullah, Iftikhar Ahmad, Abdul Rauf, Sajid Mahmood Nadeem, Muhammad Yahya Khan, Sabir Hussain, Laura Bulgariu
A pot experiment was conducted to evaluate the potential of two plant growth promoting rhizobacteria (PGPR) viz. Bacillus sp. CIK-516 and Stenotrophomonas sp. CIK-517Y for improving the growth and Ni uptake of radish (Raphanus sativus) in the presence of four different levels of Ni contamination (0, 50, 100, 150 mg Ni kg(-1) soil). Plant growth, dry biomass, chlorophyll and nitrogen contents were significantly reduced by the exogenous application of Ni, however, bacterial inoculation diluted the negative impacts of Ni stress on radish by improving these parameters...
September 29, 2017: Chemosphere
Parveen K Sharma, Riffat I Munir, Teresa de Kievit, David B Levin
Pseudomonas chlororaphis PA23 was isolated from soybean roots as a plant-growth-promoting rhizobacterium. This strain secretes a wide range of compounds, including the antibiotics phenazine-1-carboxylic acid (PCA), pyrrolnitrin, and 2-hydroxyphenazine. We have determined that P. chlororaphis PA23 can synthesize medium-chain-length polyhydroxyalkanoate (PHA) polymers utilizing free fatty acids, such as octanoic acid and nonanoic acid, as well as vegetable oils as sole carbon sources. Genome analysis identified a pha operon containing 7 genes in P...
October 5, 2017: Canadian Journal of Microbiology
Ricky W Lewis, Jason Unrine, Paul M Bertsch, David H McNear
Metal containing engineered nanomaterials (ENMs) are now commonly used in various industrial and commercial applications. Many of these materials can be transformed during waste water treatment and ultimately enter terrestrial ecosystems via agriculturally applied biosolids. It is unclear how agriculturally important soil microbes will be affected by exposure to environmentally relevant, sublethal concentrations of ENMs and their transformation products (i.e., ions, aggregates, etc.). A method was developed, which puts O2 consumption responses in terms of viability, and tested by examining the toxic effects of Ag(+), Zn(2+), and Ni(2+) ions on the plant growth promoting rhizobacterium (PGPR) Bacillus amyloliquefaciens GB03...
October 4, 2017: Biointerphases
Jordan Vacheron, Guilhem Desbrosses, Sébastien Renoud, Rosa-Maria Padilla-Aguilar, Vincent Walker, Daniel Muller, Claire Prigent-Combaret
Fluorescent pseudomonads are playing key roles in plant-bacteria symbiotic interactions due to the multiple plant-beneficial functions (PBFs) they are harboring. The relative contributions of PBFs to plant-stimulatory effects of the well-known PGPR Pseudomonas kilonensis F113 (formerly P. fluorescens F113) were investigated using a genetic approach. To this end, several deletion mutants were constructed: simple mutants ΔphlD (impaired in the biosynthesis of 2,4-diacetylphloroglucinol [DAPG]), ΔacdS (deficient in 1-aminocyclopropane-1-carboxylate [ACC] deaminase activity), Δgcd (glucose dehydrogenase deficient, impaired in phosphate solubilization), and ΔnirS (nitrite reductase deficient) and a quadruple mutant (deficient in the 4 PBFs mentioned above)...
October 3, 2017: Molecular Plant-microbe Interactions: MPMI
María Victoria Salomon, Patricia Piccoli, Iván Funes Pinter, Wendy Ann Stirk, Manoj Kulkarni, Johannes van Staden, Rubén Bottini
Sustainable agricultural practices have been developed as alternative to the use of agrochemicals, and viticulture is not exempt of that. Plant growth promoting rhizobacteria (PGPR) and smoke water extracts (SW) are environmentally-friendly alternative to those agrochemicals. The aim of this study was to investigate the single or combined effects of SW and the PGPR Pseudomonas fluorescens (Pf) and Bacillus licheniformis (Bl) on the physiology and biochemistry of grapevines plants. After 38 days, single applications of SW solutions and bacterial suspensions increase rooting and root length...
September 19, 2017: Plant Physiology and Biochemistry: PPB
Mohit Agarwal, Shrivardhan Dheeman, Ramesh Chand Dubey, Pradeep Kumar, Dinesh Kumar Maheshwari, Vivek K Bajpai
Chitinase and surfactin-mediated biocontrol of Rhizoctonia solani and Fusarium oxysporum causing wilt and root rot of Fagopyrum esculentum respectively has been studied in this communication. Bacillus pumilus MSUA3 as a potential bacterial strain strongly inhibited the growth of R. solani and F. oxysporum involving the chitinolytic enzymes and an antibiotic surfactin. Plant growth promoting attributes seem to be involved in plant growth promotion and yield attributes. The action of cell-free culture supernatant (CFCS) was found deleterious to F...
December 2017: Microbiological Research
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