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Nuamzanei, Changmai U, Sk S, Kumar N, Borah B, Chikkaputtaiah C, Saikia R, Phukan T. Impact of polyvinyl chloride (PVC) microplastic on growth, photosynthesis and nutrient uptake of Solanum lycopersicum L. (Tomato). Environ Pollut 2024; 349:123994. [PMID: 38636835 DOI: 10.1016/j.envpol.2024.123994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/27/2024] [Accepted: 04/15/2024] [Indexed: 04/20/2024]
Abstract
Microplastics (MPs) pollution and their impact on plants have become a global threat, but their effect at the molecular level remains scarce. This study aims to gain insight into the effects of polyvinylchloride microplastic (PVC-MP) on tomato plants at the genetic and protein levels. In this study, we found that increasing concentrations of PVC-MP (2.5, 5,7.5, and 10% w/w) in the soil did not cause any phytotoxic (chlorosis or necrosis) symptoms but it did result in a dose-dependent reduction in plant growth-related parameters, such as height, leaf area, stem diameter, and plant fresh and dry weight. Additionally, the number of secondary roots was reduced while the primary roots were elongated. Furthermore, PVC-MP also caused a significant decrease in light-harvesting pigments chlorophylls, and carotenoids while increasing the level of reactive oxygen species (ROS) and lipid peroxidation in plants. Microscopic analysis of the roots revealed the uptake of PVC-MP of size less than 10 μm. Micro- and macro-element analysis showed changes in concentrations of Ca, Cu, Fe, Mg, Mn, Ni, and Zn, upon PVC-MP exposure. Results from western blotting and q-PCR showed that higher doses of PVC-MP significantly reduced the CO2-fixing enzyme RuBisCO and D1 proteins of PSII at both protein and transcript levels. These findings suggest that lower levels of light-harvesting pigments, D1 protein, RuBisCO, and modulation of nutrient absorption are among the factors responsible for growth suppression in tomato plants upon exposure to PVC-MP. As tomato plants are economically significant crops, an increase in PVC-MP in agricultural fields may have a detrimental influence on crop production, resulting in economic loss.
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Affiliation(s)
- Nuamzanei
- Agro-technology and Rural Development Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Udeshna Changmai
- Agro-technology and Rural Development Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sahana Sk
- Agro-technology and Rural Development Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Niraj Kumar
- Biological Sciences and Technology Division (BSTD), CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Babli Borah
- Biological Sciences and Technology Division (BSTD), CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Channakeshavaiah Chikkaputtaiah
- Biological Sciences and Technology Division (BSTD), CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Ratul Saikia
- Biological Sciences and Technology Division (BSTD), CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Tridip Phukan
- Agro-technology and Rural Development Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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2
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Begum M, Saikia R, Saikia SP. Triple quadrupole liquid chromatography-mass spectrometry-mediated evaluation of vitamin D 2 accumulation potential, antioxidant capacities, and total polyphenol content of white jelly mushroom ( Tremella fuciformis Berk.). Mycologia 2024; 116:464-474. [PMID: 38489159 DOI: 10.1080/00275514.2024.2313435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 01/30/2024] [Indexed: 03/17/2024]
Abstract
Tremella fuciformis Berk. (TF), or the white jelly mushroom, is well known for its myriad of pharmacological properties, such as immunomodulatory, anti-inflammatory, antidiabetic, antitumor, and antioxidant activities, and hypocholesterolemic and hepatoprotective effects that boost human health. Most of the studies of TF are concentrated on its polysaccharide (glucuronoxylomannan) composition, which is responsible for its pharmacological as well as rheological properties. It is well established that mushrooms are a great source of dietary vitamin D due to the presence of ergosterol in their cell membrane. There is a lack of published data on TF as a source of vitamin D2. Therefore, this study aimed to evaluate the vitamin D2 composition of the fruiting bodies of TF using triple quadrupole liquid chromatography-mass spectrometry (LC-MS/QQQ). The results showed highest vitamin D2 content (292.02 µg/g dry weight) in the sample irradiated with ultraviolet B (UVB; 310 nm) for 180 min as compared with the control group (52.47 µg/g dry weight) (P ≤ 0.001). The results showed higher accumulation potential of vitamin D2 in TF as compared with published data available for other extensively studied culinary mushrooms, such as Agaricus bisporus, Lentinula edodes, Pleurotus ostreatus, Cordiceps militaris, and Calocybe indica. Moreover, the impact of UV treatment on antioxidant capacities and total polyphenol content of TF was also studied. The accumulation potential of vitamin D in TF reveals a novel commercial source for this nutrient.
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Affiliation(s)
- Marium Begum
- Agrotechnology and Rural Development Division, Council of Scientific and Industrial Research North East Institute of Science and Technology, Jorhat 785006, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Ratul Saikia
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
- Biological Sciences and Technology Division, Council of Scientific and Industrial Research North East Institute of Science and Technology, Jorhat 785006, India
| | - Siddhartha Proteem Saikia
- Agrotechnology and Rural Development Division, Council of Scientific and Industrial Research North East Institute of Science and Technology, Jorhat 785006, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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3
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Gogoi P, Boruah JLH, Yadav A, Debnath R, Saikia R. Comparative seasonal analysis of Eri silkworm (Samia ricini Donovan) gut composition: implications for lignocellulose degradation. Environ Sci Pollut Res Int 2023; 30:109198-109213. [PMID: 37768488 DOI: 10.1007/s11356-023-29893-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023]
Abstract
Conversion of biomass such as lignocelluloses to an alternative energy source can contribute to sustainable development. Recently, biomass-degrading enzymes are reported to be common resources in insect-microbe interacting systems. Northeast India harbors ample sericigenous insect resources which are exploited for their silk products. Samia ricini Donovan is an economically important poly-phytophagous silkmoth capable of digesting foliage from different plant species, suggesting the versatility of a robust gut system. Here, a gut bacterial profile was determined by 16S rRNA gene characterization across the holometabolous life cycle during the summer and winter seasons, revealing 3 phyla, 13 families, and 22 genera. Comparative analysis among the seasonal gut isolates revealed a high diversity in summer, predominated by the genus Bacillus due to its high occurrence in all developmental stages. Shannon's diversity index demonstrated the second and fourth instars of summer as well as the fifth instar of winter to be relatively better developmental stages for gut bacteria assembly. Bacterial community shifts in concert to host developmental changes were found to be apparent between early instars and late instars in summer, which differed from those of winter. Forty-three and twenty-nine gut bacterial isolates were found to be cellulolytic and xylanolytic enzyme producers, respectively. The present results illustrate the gut microbiota of S. ricini over the seasons and support the holometabolous life cycle effect as the most likely factor shaping the gut bacterial microbiota. These findings may provide leads for the development of new cleaner and environmentally friendly lignocellulose-degrading enzymes.
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Affiliation(s)
- Parishmita Gogoi
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
- Academy of Scientific and Innovative Research, Uttar Pradesh, Kamala Nehru Nagar, Sector 19, Ghaziabad, 201002, India
| | - Jyoti Lakshmi Hati Boruah
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Archana Yadav
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Rajal Debnath
- Seri-Biotech Research Laboratory, Central Silk Board, Bangalore, 560035, India
| | - Ratul Saikia
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India.
- Academy of Scientific and Innovative Research, Uttar Pradesh, Kamala Nehru Nagar, Sector 19, Ghaziabad, 201002, India.
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Talukdar P, Bordoloi P, Bora PP, Yadav A, Saikia R, Geed SR. Assessment of oily sludge biodegradation in lab scale composting and slurry bioreactor by bacterial consortium. J Environ Manage 2023; 342:118360. [PMID: 37315467 DOI: 10.1016/j.jenvman.2023.118360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 06/05/2023] [Accepted: 06/07/2023] [Indexed: 06/16/2023]
Abstract
The present study aimed to investigate biodegradability of oily sludge in lab scale composting and slurry bioreactor using a potential bacterial consortium isolated from petroleum-contaminated sites. The consortium used in the study consisted of bacterial genera, including Enterobacter, Bacillus, Microbacterium, Alcaligenes Pseudomonas, Ochrobactrum, Micrococcus, and Shinella which were obtained after rigorous screening using different hydrocarbons. The meticulously designed lab scale composting experiments were carried out and showed that the combination of 10% oily sludge (A1) exhibited the highest total carbon (TC) removal, which was 40.33% within 90 days. To assess the composting experiments' efficiency, the first (k1) and second (k2) order rate constants were evaluated and was found to be 0.0004-0.0067 per day and second (k2) 0.0000008-0.00005 g/kg. day respectively. To further enhance the biodegradation rate of A1 combination, a slurry bioreactor was used. The maximum total petroleum hydrocarbon (TPH) removals in a slurry bioreactor for cycle-I and -II were 48.8% and 46.5%, respectively, on the 78th and 140th days of the treatment. The results obtained in the study will be a technological platform for the development of slurry phase treatment of petroleum waste in a sustainable and eco-friendly manner.
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Affiliation(s)
- Pooja Talukdar
- CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Palakshi Bordoloi
- CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Priyankush Protim Bora
- CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Archana Yadav
- CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Ratul Saikia
- CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sachin Rameshrao Geed
- CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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Yadav A, Boruah JLH, Geed SR, Sharma RK, Saikia R. Occurrence, identification and characterization of diazotrophic bacteria from aerial roots of Rhynchostylis retusa (L.) Blume for plant growth-promoting activity. Arch Microbiol 2023; 205:131. [PMID: 36947279 DOI: 10.1007/s00203-023-03458-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 02/17/2023] [Accepted: 03/01/2023] [Indexed: 03/23/2023]
Abstract
In this study, the diversity of diazotrophic bacteria of orchid Rhynchostylis retusa (L.) Blume and its potential application in plant growth promotion were evaluated. About 183 nitrogen-fixing bacteria were isolated to screen various plant growth-promoting traits viz. phosphate solubilization,IAA, siderophore, HCN, biofilm and ammonia production. Based on 16S rRNA gene sequencing analysis Achromobacter, Arthrobacter, Acinetobacter, Bacillus, Brevibacterium, Curtobacterium, Erwinia, Kosakonia, Lysinibacillus, Klebseilla, Microbacterium, Mixta, Pantoea, Pseudomonas and Stenotrophomonas isolates were selected and showed positive results for PGP traits. Overall, genus Pantoea, Brevibacterium, Achromobacter, Arthrobacter, Klebsiella, Mixta, Bacillus, and Pseudomonas had the most pronounced PGP characteristics and acetylene reduction among the screened isolates. BOX PCR fingerprinting analysis showed variation in polymorphic banding patterns among diazotrophic strains. PCR amplification of nifH gene and the presence of 37 kDa nitrogenase reductase enzyme band in western blot indicated presence of nitrogenase activity. Our study showed that orchid R. retusa diazotroph interaction helps orchid plant to fix nitrogen, essential nutrients, and control pathogen entry. To the best of our knowledge, this is the first report on characterization of diazotrophic bacterial community from aerial roots of R. retusa.
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Affiliation(s)
- Archana Yadav
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India.
- Department of Applied Biology, University of Science and Technology, Baridua, Meghalaya, India.
| | - Jyoti Lakshmi Hati Boruah
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Sachin Rameshrao Geed
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Rabin K Sharma
- Department of Applied Biology, University of Science and Technology, Baridua, Meghalaya, India
| | - Ratul Saikia
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
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6
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Saikia J, Kotoky R, Debnath R, Kumar N, Gogoi P, Yadav A, Saikia R. De novogenomic analysis ofEnterobacter asburiaeEBRJ12, a plant growth-promoting rhizobacteria isolated from the rhizosphere of Phaseolus vulgarisL. J Appl Microbiol 2023; 134:6965352. [PMID: 36728698 DOI: 10.1093/jambio/lxac090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 12/12/2022] [Accepted: 12/28/2022] [Indexed: 02/03/2023]
Abstract
AIM Environmental stresses such as water deficit induced stress are one of the major limiting factors in crop production. However, some plant growth-promoting rhizobacteria (PGPR) can promote plant growth in such adverse condition. Therefore, the objective was to isolate rhizospheric bacteria from Phaseolus vulgaris L. growing in a drought-affected soil and to analyze its plant growth promoting (PGP) efficacy to black gram (Vigna mungo L.) and Bhut jolokia (Capsicum chinense Jacq.). Whole-genome sequencing of the potential bacteria was targeted to analyze the genetic potential of the isolate as a plant growth-promoting agent. METHODS AND RESULTS The isolate Enterobacter asburiae EBRJ12 was selected based on its PGP efficacy, which significantly improved plant growth and development. The genomic analysis revealed the presence of one circular chromosome of size 4.8 Mb containing 16 genes for osmotic stress regulation including osmotically inducible protein osmY, outer membrane protein A precursor ompA, aquaporin Z, and an operon for osmoprotectant ABC transporter yehZYXW. Moreover, the genome has a complete genetic cluster for biosynthesis of siderophore Enterobactin and siderophore Aerobactin.The PGP effects were verified with black gram and Bhut jolokia in pot experiments. The isolate significantly increased the shoot length by 35.0% and root length by 58.0% of black gram, while 41.0% and 57.0% of elevation in shoot and root length were observed in Bhut jolokia compared to non-inoculated plants. CONCLUSIONS The EBRJ12 has PGP features that could improve the growth in host plants, and the genomic characterization revealed the presence of genetic potential for plant growth promotion.
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Affiliation(s)
- Juthika Saikia
- Biological Sciences and Technology Division, CSIR-North East Institute of Sciences and Technology, Jorhat 785006, India
| | - Rhitu Kotoky
- Regional Centre for Biotechnology, NCR-Delhi 121001, India
| | - Rajal Debnath
- Biological Sciences and Technology Division, CSIR-North East Institute of Sciences and Technology, Jorhat 785006, India.,Seribiotech Research Laboratory, Central Silk Board, Sarjapura Road Kodathi, Bangalore 560035, India
| | - Niraj Kumar
- Biological Sciences and Technology Division, CSIR-North East Institute of Sciences and Technology, Jorhat 785006, India.,Academy of Scientific and Innovative Research, Kamala Nehru Nagar, Sector 19, Ghaziabad 201002, India
| | - Priyanka Gogoi
- Biological Sciences and Technology Division, CSIR-North East Institute of Sciences and Technology, Jorhat 785006, India.,Academy of Scientific and Innovative Research, Kamala Nehru Nagar, Sector 19, Ghaziabad 201002, India
| | - Archana Yadav
- Biological Sciences and Technology Division, CSIR-North East Institute of Sciences and Technology, Jorhat 785006, India
| | - Ratul Saikia
- Biological Sciences and Technology Division, CSIR-North East Institute of Sciences and Technology, Jorhat 785006, India.,Academy of Scientific and Innovative Research, Kamala Nehru Nagar, Sector 19, Ghaziabad 201002, India
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Sarma RK, Gohain A, Ahmed TH, Yadav A, Saikia R. An environment-benign approach of bamboo pulp bleaching using extracellular xylanase of strain Bacillus stratosphericus EB-11 isolated from elephant dung. Folia Microbiol (Praha) 2023; 68:135-149. [PMID: 36048323 DOI: 10.1007/s12223-022-01003-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 08/23/2022] [Indexed: 11/30/2022]
Abstract
The use of microbial enzymes is highly encouraged in paper and pulp industries to reduce the excessive use of hazardous chemicals. During the study, xylanase of Bacillus stratosphericus EB-11 was characterized for pulp bleaching applications. The extracellular xylanase was produced under submerged fermentation using bamboo waste as a natural carbon source. There was fast cell division and enzyme production under optimized fermentation conditions in the bioreactor. The highest activity was 91,200U after 30 h of growth with Km and Vmax of 3.52 mg/mL and 391.5 μmol/min per mg respectively. The purified enzyme with molecular mass ~ 60 kDa had conferred positive activity on native PAGE. The strong inhibition by ethylenediaminetetraacetate and SDS showed the metallo-xylanase nature of the purified enzyme. The bacterial xylanase reduces the use of hydrogen peroxide by 0.4%. Similarly, biological oxygen demand and chemical oxygen demand were reduced by 42.6 and 35.2%. The xylanase-hydrogen peroxide combined treatment and conventional chlorine dioxide-alkaline (CDE1D1D2) bleaching showed almost similar improvement in physicochemical properties of bamboo pulp. Xylanase-peroxide bleaching reduces the lignin content to 4.95% from 13.32% unbleached pulp. This content after CDE1D1D2 treatment was 4.21%. The kappa number decreased from 15.2 to 9.46 with increasing the burst factor (15.51), crystallinity index (60.25%), viscosity (20.1 cp), and brightness (65.4%). The overall finding will encourage the development of new cleaner methods of bleaching in the paper and pulp industry.
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Affiliation(s)
| | - Anwesha Gohain
- Department of Botany, Arunachal University of Studies, PIN-792013, Namsai, India
| | - Tobiul Hussain Ahmed
- Chemical Engineering Group, Engineering Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India
| | - Archana Yadav
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India
| | - Ratul Saikia
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat-785006, Assam, India
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Yadav A, Mudoi KD, Kumar N, Geed SR, Gogoi P, Sharma RK, Saikia R. Auxin biosynthesis by Microbacterium testaceum Y411 associated with orchid aerial roots and their efficacy in micropropagation. Front Plant Sci 2022; 13:1037109. [PMID: 36518501 PMCID: PMC9742431 DOI: 10.3389/fpls.2022.1037109] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Root-associated bacteria strongly affect plant growth and development by synthesizing growth regulators and stress-relieving metabolites. The present study is mainly focused on assessing aerial root-associated bacteria of Rhynchostylis retusa (L.) Blume is an endemic epiphytic orchid responsible for auxin production and influencing plant growth. A bacterial isolate, Microbacterium testaceum Y411, was found to be the most active producer of indole-3-acetic acid (IAA). The maximum IAA production (170µg/mL) was recorded with the bacterium at optimum process parameters such as pH 7, temperature 30°C, and tryptophan 1000 µg/mL in a culture medium for 48 h. The extracted auxin was purified and analyzed by FT-IR, HPLC, and HR-MS, indicating bacterial auxin has a similar mass value to 4-chloroindole-3-acetic acid auxin. Furthermore, the bacterial auxin was tested on in vitro propagation of orchid, Cymbidium aloifolium, and 90% seed germination was recorded in Murashige and Skoog's medium supplemented with bacterial auxin. The novel results obtained in this study are used for agricultural applications and the Microbacterium testaceum Y411 is a valuable biotechnological resource for a natural auxin.
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Affiliation(s)
- Archana Yadav
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
- Department of Applied Biology, University of Science and Technology, Meghalaya, India
| | - Kalpataru Dutta Mudoi
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Niraj Kumar
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Sachin Rameshrao Geed
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Parishmita Gogoi
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Rabin K. Sharma
- Department of Applied Biology, University of Science and Technology, Meghalaya, India
| | - Ratul Saikia
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
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Goswami K, Deka Boruah HP, Saikia R. Purification and characterization of cellulase produced by
Novosphingobium
sp. Cm1 and its waste hydrolysis efficiency and bio‐stoning potential. J Appl Microbiol 2022; 132:3618-3628. [DOI: 10.1111/jam.15475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 01/29/2022] [Accepted: 02/02/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Kongkana Goswami
- CSIR‐North East Institute of Science and Technology Jorhat‐785006 Assam India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad‐201002 India
| | | | - Ratul Saikia
- CSIR‐North East Institute of Science and Technology Jorhat‐785006 Assam India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad‐201002 India
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10
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Goswami K, DekaBoruah HP, Saikia R. Production of cellulase by Novosphingobium sp. Cm1 and its potential application in lignocellulosic waste hydrolysis. Prep Biochem Biotechnol 2021; 52:724-735. [PMID: 34730478 DOI: 10.1080/10826068.2021.1989698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Management of lignocellulosic wastes in and around the municipality area requires special consideration. Continuous deposition of these wastes to the nearby areas led to gradual deterioration of the environment. The objective of this study was to produce cellulase from the bacteria isolated from the unexplored rainforest of NE-India for lignocellulosic waste hydrolysis. Based on carboxymethyl cellulose utilization and the congo red test, Novosphingobium sp. Cm1 was found to be the most promising strain out of 114 bacterial isolates and the strain was selected for further study. The optimization of the fermentative conditions for maximum enzyme activity was carried out using one factor-at-a-time strategy and the optimum pH, temperature and incubation time was recorded as pH 5, 37 °C and 96 h respectively. The maximum β-1,4-endoglucanase activity was observed with 1.5% CMC (5.1 ± 0.05 U/mL) and 0.25% yeast extract (7.6 ± 0.72 U/mL). The bacterial waste hydrolysis ability was investigated using three wastes where vegetable waste showed maximum activity of 3.4 ± 0.48 U/mL. Bacterial interaction and waste utilization were verified using Scanning Electron Microscope and Fourier-Transform infrared spectroscopy analysis. The present study confirmed the promising ability of Novosphingobium sp. to waste hydrolysis. Further investigations may lead to new possibilities for low-cost enzyme production that will help to meet the rising cellulase demand.
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Affiliation(s)
- Kongkana Goswami
- Biological Science & Technology Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, Assam, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
| | - Hari Prasanna DekaBoruah
- Biological Science & Technology Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, Assam, India.,Govt. Model College, Kaziranga, Golaghat, Assam, India
| | - Ratul Saikia
- Biological Science & Technology Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, Assam, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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Dasgupta A, Handique PJ, Saikia R. A Rapid and Effective Method for Extraction of Bacterial DNA From Crude Oil-Contaminated Soil. CURR SCI INDIA 2018. [DOI: 10.18520/cs/v115/i2/211-212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Saikia J, Sarma RK, Dhandia R, Yadav A, Bharali R, Gupta VK, Saikia R. Alleviation of drought stress in pulse crops with ACC deaminase producing rhizobacteria isolated from acidic soil of Northeast India. Sci Rep 2018; 8:3560. [PMID: 29476114 PMCID: PMC5824784 DOI: 10.1038/s41598-018-21921-w] [Citation(s) in RCA: 97] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 02/13/2018] [Indexed: 11/09/2022] Open
Abstract
The agricultural crops are often affected by the scarcity of fresh water. Seasonal drought is a major constraint on Northeast Indian agriculture. Almost 80% of the agricultural land in this region is acidic and facing severe drought during the winter period. Apart from classical breeding and transgenic approaches, the application of plant-growth-promoting bacteria (PGPB) is an alternative strategy for improving plant fitness under stressful conditions. The 1-aminocyclopropane-1-carboxylate (ACC) deaminase-producing PGPB offer drought stress tolerance by regulating plant ethylene levels. The aim of the present study was to evaluate the consortium effect of three ACC-deaminase producing rhizobacteria - Ochrobactrum pseudogrignonenseRJ12, Pseudomonas sp.RJ15 and Bacillus subtilisRJ46 on drought stress alleviation in Vigna mungo L. and Pisum sativum L. Consortium treatment significantly increase seed germination percentage, root length, shoot length, and dry weight of treated plants. An elevated production of reactive oxygen species scavenging enzymes and cellular osmolytes; higher leaf chlorophyll content; increase in relative water content and root recovery intension were observed after consortium treatment in comparison with the uninoculated plants under drought conditions. The consortium treatment decreased the ACC accumulation and down-regulated ACC-oxidase gene expression. This consortium could be an effective bio-formulator for crop health improvement in drought-affected acidic agricultural fields.
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Affiliation(s)
- Juthika Saikia
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Rupak K Sarma
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Rajashree Dhandia
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Archana Yadav
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
| | - Rupjyoti Bharali
- Department of Biotechnology, Gauhati University, Guwahati, 781014, Assam, India
| | - Vijai K Gupta
- Department of Chemistry and Biotechnology, ERA Chair of Green Chemistry, Tallinn University of Technology, Tallinn, 12618, Estonia
| | - Ratul Saikia
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India.
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Chutia S, Narzari R, Bordoloi N, Saikia R, Gogoi L, Sut D, Bhuyan N, Kataki R. Pyrolysis of Dried Black Liquor Solids and Characterization of the Bio-Char and Bio-Oil. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.matpr.2018.11.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Passari AK, Mishra VK, Singh G, Singh P, Kumar B, Gupta VK, Sarma RK, Saikia R, Donovan AO, Singh BP. Insights into the functionality of endophytic actinobacteria with a focus on their biosynthetic potential and secondary metabolites production. Sci Rep 2017; 7:11809. [PMID: 28924162 PMCID: PMC5603540 DOI: 10.1038/s41598-017-12235-4] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 09/06/2017] [Indexed: 12/20/2022] Open
Abstract
Endophytic actinobacteria play an important role in growth promotion and development of host plant by producing enormous quantities of novel bioactive natural products. In the present investigation, 169 endophytic actinobacteria were isolated from endospheric tissues of Rhynchotoechum ellipticum. Based on their antimicrobial potential, 81 strains were identified by 16rRNA gene analysis, which were taxonomically grouped into 15 genera. All identified strains were screened for their plant growth promoting attributes and, for the presence of modular polyketide synthases (PKSI, PKSII and nonribosomal peptide synthetase (NRPS) gene clusters to correlate the biosynthetic genes with their functional properties. Expression studies and antioxidant potential for four representative strains were evaluated using qRT-PCR and DPPH assay respectively. Additionally, six antibiotics (erythromycin, ketoconazole, fluconazole, chloramphenicol, rifampicin and miconazole) and nine phenolic compounds (catechin, kaempferol, chebulagic acid, chlorogenic acid, Asiatic acid, ferulic acid, arjunic acid, gallic acid and boswellic acid) were detected and quantified using UHPLC-QqQLIT-MS/MS. Furthermore, three strains (BPSAC77, 121 and 101) showed the presence of the anticancerous compound paclitaxel which was reported for the first time from endophytic actinobacteria. This study provides a holistic picture, that endophytic actinobacteria are rich bacterial resource for bioactive natural products, which has a great prospective in agriculture and pharmaceutical industries.
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Affiliation(s)
- Ajit Kumar Passari
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India
| | - Vineet Kumar Mishra
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India
| | - Garima Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India
| | - Pratibha Singh
- SAIF, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, 226012, India
| | - Brijesh Kumar
- SAIF, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, 226012, India
| | - Vijai Kumar Gupta
- Department of Chemistry and Biotechnology, ERA Chair of Green Chemistry, Tallinn University of Technology, 12618, Tallinn, Estonia
| | | | - Ratul Saikia
- Biotechnology Division, CSIR-NEIST, Jorhat, Assam, 785006, India
| | - Anthonia O' Donovan
- Applied Biology and Biopharmaceutical Science, School of Science & Computing, Galway-Mayo Institute of Technology, Galway, Ireland
| | - Bhim Pratap Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India.
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Passari AK, Mishra VK, Gupta VK, Saikia R, Singh BP. Distribution and Identification of Endophytic Streptomyces Species from Schima wallichii as Potential Biocontrol Agents against Fungal Plant Pathogens. Pol J Microbiol 2016; 65:319-329. [PMID: 29334064 DOI: 10.5604/17331331.1215611] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The prospective of endophytic microorganisms allied with medicinal plants is disproportionally large compared to those in other biomes. The use of antagonistic microorganisms to control devastating fungal pathogens is an attractive and eco-friendly substitute for chemical pesticides. Many species of actinomycetes, especially the genus Streptomyces, are well known as biocontrol agents. We investigated the culturable community composition and biological control ability of endophytic Streptomyces sp. associated with an ethanobotanical plant Schima wallichi. A total of 22 actinobacterial strains were isolated from different organs of selected medicinal plants and screened for their biocontrol ability against seven fungal phytopathogens. Seven isolates showed significant inhibition activity against most of the selected pathogens. Their identification based on 16S rRNA gene sequence analysis, strongly indicated that all strains belonged to the genus Streptomyces. An endophytic strain BPSAC70 isolated from root tissues showed highest percentage of inhibition (98.3 %) against Fusarium culmorum with significant activity against other tested fungal pathogens. Phylogenetic analysis based on 16S rRNA gene sequences revealed that all seven strains shared 100 % similarity with the genus Streptomyces. In addition, the isolates were subjected to the amplification of antimicrobial genes encoding polyketide synthase type I (PKS-I) and nonribosomal peptide synthetase (NRPS) and found to be present in most of the potent strains. Our results identified some potential endophytic Streptomyces species having antagonistic activity against multiple fungal phytopathogens that could be used as an effective biocontrol agent against pathogenic fungi.
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Affiliation(s)
- Ajit K Passari
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, India
| | - Vineet K Mishra
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, India
| | - Vijai K Gupta
- Molecular Glyco-biotechnology Group, Department of Biochemistry, National University of Ireland Galway, Galway, Ireland
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Bhim P Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, India
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Talukdar M, Bordoloi M, Dutta P, Saikia S, Kolita B, Talukdar S, Nath S, Yadav A, Saikia R, Jha D, Bora T. Structure elucidation and biological activity of antibacterial compound from Micromonospora auratinigra
, a soil Actinomycetes. J Appl Microbiol 2016; 121:973-87. [DOI: 10.1111/jam.13233] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 05/20/2016] [Accepted: 07/04/2016] [Indexed: 11/28/2022]
Affiliation(s)
- M. Talukdar
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - M. Bordoloi
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - P.P. Dutta
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Saikia
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - B. Kolita
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Talukdar
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Nath
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - A. Yadav
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - R. Saikia
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - D.K. Jha
- Microbial Ecology Laboratory; Department of Botany; Gauhati University; Guwahati Assam India
| | - T.C. Bora
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
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18
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Leo VV, Passari AK, Joshi JB, Mishra VK, Uthandi S, Ramesh N, Gupta VK, Saikia R, Sonawane VC, Singh BP. A Novel Triculture System (CC3) for Simultaneous Enzyme Production and Hydrolysis of Common Grasses through Submerged Fermentation. Front Microbiol 2016; 7:447. [PMID: 27065995 PMCID: PMC4815437 DOI: 10.3389/fmicb.2016.00447] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 03/18/2016] [Indexed: 11/13/2022] Open
Abstract
The perennial grasses are considered as a rich source of lignocellulosic biomass, making it a second generation alternative energy source and can diminish the use of fossil fuels. In this work, four perennial grasses Saccharum arundinaceum, Panicum antidotale, Thysanolaena latifolia, and Neyraudia reynaudiana were selected to verify their potential as a substrate to produce hydrolytic enzymes and to evaluate them as second generation energy biomass. Here, cellulase and hemi-cellulase producing three endophytic bacteria (Burkholderia cepacia BPS-GB3, Alcaligenes faecalis BPS-GB5 and Enterobacter hormaechei BPS-GB8) recovered from N. reynaudiana and S. arundinaceum were selected to develop a triculture (CC3) consortium. During 12 days of submerged cultivation, a 55–70% loss in dry weight was observed and the maximum activity of β-glucosidase (5.36–12.34 IU) and Xylanase (4.33 to 10.91 IU) were observed on 2nd and 6th day respectively, whereas FPase (0.26 to 0.53 IU) and CMCase (2.31 to 4.65 IU) showed maximum activity on 4th day. Around 15–30% more enzyme activity was produced in CC3 as compared to monoculture (CC1) and coculture (CC2) treatments, suggested synergetic interaction among the selected three bacterial strains. Further, the biomass was assessed using Fourier-transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The FTIR analysis provides important insights into the reduction of cellulose and hemicellulose moieties in CC3 treated biomass and SEM studies shed light into the disruption of surface structure leading to access of cellulose or hemicelluloses microtubules. The hydrolytic potential of the CC3 system was further enhanced due to reduction in lignin as evidenced by 1–4% lignin reduction in biomass compositional analysis. Additionally, laccase gene was detected from A. faecalis and E. hormaechei which further shows the laccase production potential of the isolates. To our knowledge, first time we develop an effective endophytic endogenous bacterial triculture system having potential for the production of extracellular enzymes utilizing S. arundinaceum and N. reynaudiana as lignocellulosic feedstock.
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Affiliation(s)
- Vincent V Leo
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram UniversityAizawl, India; Department of Biotechnology, J.J College for Arts and SciencePudukkottai, India
| | - Ajit K Passari
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
| | - J Beslin Joshi
- Biocatalysts Lab, Department of Agricultural Microbiology, Tamil Nadu Agricultural University Coimbatore, India
| | - Vineet K Mishra
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
| | - Sivakumar Uthandi
- Biocatalysts Lab, Department of Agricultural Microbiology, Tamil Nadu Agricultural University Coimbatore, India
| | - N Ramesh
- Department of Biotechnology, J.J College for Arts and Science Pudukkottai, India
| | - Vijai K Gupta
- Molecular Glyco-biotechnology Group, Department of Biochemistry, National University of Ireland Galway Galway, Ireland
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science and Technology Jorhat, Assam, India
| | - Vijay C Sonawane
- Biochemical Engineering Research and Process Development Centre (BERPDC), Institute of Microbial Technology Chandigarh, India
| | - Bhim P Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
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Debnath R, Yadav A, Gupta VK, Singh BP, Handique PJ, Saikia R. Rhizospheric Bacterial Community of Endemic Rhododendron arboreum Sm. Ssp. delavayi along Eastern Himalayan Slope in Tawang. Front Plant Sci 2016; 7:1345. [PMID: 27642287 PMCID: PMC5009118 DOI: 10.3389/fpls.2016.01345] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 08/22/2016] [Indexed: 05/15/2023]
Abstract
Information on rhizosphere microbiome of endemic plants from high mountain ecosystems against those of cultivated plantations is inadequate. Comparative bacterial profiles of endemic medicinal plant Rhododendron arboreum Sm. subsp. delavayi rhizosphere pertaining to four altitudinal zonation Pankang Thang (PTSO), Nagula, Y-junction and Bum La (Indo-China border; in triplicates each) along cold adapted Eastern slope of Himalayan Tawang region, India is described here. Significant differences in DGGE profile between below ground bulk vs. rhizospheric community profile associated with the plant was identified. Tagged 16S amplicon sequencing from PTSO (3912 m) to Bum La (4509 m), revealed that soil pH, total nitrogen (TN), organic matter (OM) significantly influenced the underlying bacterial community structure at different altitudes. The relative abundance of Acidobacteria was inversely related to pH, as opposed to TN which was positively correlated to Acidobacteria and Proteobacteria abundance. TN was also the significant predictor for less abundant taxonomic groups Chloroflexi, Gemmatimonadetes, and Nitrospirae. Bum La soil harbored less bacterial diversity compared to other sites at lower altitudes. The most abundant phyla at 3% genetic difference were Acidobacteria, Actinobacteria, and Proteobacteria amongst others. Analysis of similarity indicated greater similarity within lower altitudinal than higher altitudinal group (ANOSIM, R = 0.287, p = 0.02). Constraining the ordination with the edaphic factor explained 83.13% of variation. Unique phylotypes of Bradyrhizobium and uncultured Rhizobiales were found in significant proportions at the four regions. With over 1% relative abundance Actinobacteria (42.6%), Acidobacteria (24.02%), Proteobacteria (16.00%), AD3 (9.23%), WPS-2 (5.1%), and Chloroflexi (1.48%) dominated the core microbiome.
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Affiliation(s)
- Rajal Debnath
- Microbial Biotechnology Group, Biological Science and Technology Division, Council of Scientific and Industrial Research-North East Institute of Science and TechnologyJorhat, India
| | - Archana Yadav
- Microbial Biotechnology Group, Biological Science and Technology Division, Council of Scientific and Industrial Research-North East Institute of Science and TechnologyJorhat, India
| | - Vijai K. Gupta
- Molecular Glycobiotechnology Group, Discipline of Biochemistry, National University of Ireland GalwayGalway, Ireland
| | - Bhim P. Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram UniversityAizawl, India
| | | | - Ratul Saikia
- Microbial Biotechnology Group, Biological Science and Technology Division, Council of Scientific and Industrial Research-North East Institute of Science and TechnologyJorhat, India
- *Correspondence: Ratul Saikia,
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Passari AK, Mishra VK, Gupta VK, Yadav MK, Saikia R, Singh BP. In Vitro and In Vivo Plant Growth Promoting Activities and DNA Fingerprinting of Antagonistic Endophytic Actinomycetes Associates with Medicinal Plants. PLoS One 2015; 10:e0139468. [PMID: 26422789 PMCID: PMC4589368 DOI: 10.1371/journal.pone.0139468] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 09/14/2015] [Indexed: 11/18/2022] Open
Abstract
Endophytic actinomycetes have shown unique plant growth promoting as well as antagonistic activity against fungal phytopathogens. In the present study forty-two endophytic actinomycetes recovered from medicinal plants were evaluated for their antagonistic potential and plant growth-promoting abilities. Twenty-two isolates which showed the inhibitory activity against at least one pathogen were subsequently tested for their plant-growth promoting activities and were compared genotypically using DNA based fingerprinting, including enterobacterial repetitive intergenic consensus (ERIC) and BOX repetitive elements. Genetic relatedness based on both ERIC and BOX-PCR generates specific patterns corresponding to particular genotypes. Exponentially grown antagonistic isolates were used to evaluate phosphate solubilization, siderophores, HCN, ammonia, chitinase, indole-3-acetic acid production, as well as antifungal activities. Out of 22 isolates, the amount of indole-3-acetic acid (IAA) ranging between 10–32 μg/ml was produced by 20 isolates and all isolates were positive for ammonia production ranging between 5.2 to 54 mg/ml. Among 22 isolates tested, the amount of hydroxamate-type siderophores were produced by 16 isolates ranging between 5.2 to 36.4 μg/ml, while catechols-type siderophores produced by 5 isolates ranging from 3.2 to 5.4 μg/ml. Fourteen isolates showed the solubilisation of inorganic phosphorous ranging from 3.2 to 32.6 mg/100ml. Chitinase and HCN production was shown by 19 and 15 different isolates, respectively. In addition, genes of indole acetic acid (iaaM) and chitinase (chiC) were successively amplified from 20 and 19 isolates respectively. The two potential strains Streptomyces sp. (BPSAC34) and Leifsonia xyli (BPSAC24) were tested in vivo and improved a range of growth parameters in chilli (Capsicum annuum L.) under greenhouse conditions. This study is the first published report that actinomycetes can be isolated as endophytes from within these plants and were shown to have antagonistic and plant growth promoting abilities. These results clearly suggest the possibility of using endophytic actinomycetes as bioinoculant for plant growth promotion, nutrient mobilization or as biocontrol agent against fungal phytopathogens for sustainable agriculture.
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Affiliation(s)
- Ajit Kumar Passari
- Molecular Microbiology and Systematic Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India
| | - Vineet Kumar Mishra
- Molecular Microbiology and Systematic Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India
| | - Vijai Kumar Gupta
- Molecular Glyco-biotechnology Group, Department of Biochemistry, National University of Ireland Galway, Galway, Ireland
| | - Mukesh Kumar Yadav
- Korea University college of Medicine, Korea University, Seoul, South Korea
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science & Technology, Jorhat, 785006, Assam, India
| | - Bhim Pratap Singh
- Molecular Microbiology and Systematic Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India
- * E-mail:
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Gohain A, Gogoi A, Debnath R, Yadav A, Singh BP, Gupta VK, Sharma R, Saikia R. Antimicrobial biosynthetic potential and genetic diversity of endophytic actinomycetes associated with medicinal plants. FEMS Microbiol Lett 2015; 362:fnv158. [PMID: 26347302 DOI: 10.1093/femsle/fnv158] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/01/2015] [Indexed: 11/13/2022] Open
Abstract
Endophytic actinomycetes are one of the primary groups that share symbiotic relationships with medicinal plants and are key reservoir of biologically active compounds. In this study, six selective medicinal plants were targeted for the first time for endophytic actinomycetes isolation from Gibbon Wild Life Sanctuary, Assam, India, during winter and summer and 76 isolates were obtained. The isolates were found to be prevalent in roots followed by stem and leaves. 16S rRNA gene sequence analysis revealed 16 genera, including rare genera, Verrucosispora, Isoptericola and Kytococcus, which have never been previously reported as endophytic. The genus Streptomyces (66%) was dominant in both seasons. Shannon's diversity index showed that Azadirachta indica (1.49), Rauwolfia serpentina (1.43) and Emblica officinalis (1.24) were relatively good habitat for endophytic actinomycetes. Antimicrobial strains showed prevalence of polyketide synthase (PKS) type-II (85%) followed by PKS type-I (14%) encoded in the genomes. Expression studies showed 12-fold upregulation of PKSII gene in seventh day of incubation for Streptomyces antibioticus (EAAG90). Our results emphasize that the actinomycetes assemblages within plant tissue exhibited biosynthetic systems encoding for important biologically active compounds.
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Affiliation(s)
- Anwesha Gohain
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Animesh Gogoi
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Rajal Debnath
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Archana Yadav
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Bhim P Singh
- Department of Biotechnology, Mizoram University, Aizawl, Mizoram 796004, India
| | - Vijai K Gupta
- Glyco-Biotechnology Group, Department of Biochemistry, National University of Ireland Galway, Galway H91CF50, Ireland
| | - Rajeev Sharma
- Centre for Bioinformatics Studies, Dibrugarh University, Dibrugarh 786004, Assam, India
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India
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22
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Passari AK, Mishra VK, Saikia R, Gupta VK, Singh BP. Isolation, abundance and phylogenetic affiliation of endophytic actinomycetes associated with medicinal plants and screening for their in vitro antimicrobial biosynthetic potential. Front Microbiol 2015; 6:273. [PMID: 25904906 PMCID: PMC4388002 DOI: 10.3389/fmicb.2015.00273] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 03/19/2015] [Indexed: 11/13/2022] Open
Abstract
Microorganisms associated with medicinal plants are of interest as the producers of important bioactive compounds. To date, the diversity of culturable endophytic actinomycetes associated with medicinal plants is in its initial phase of exploration. In this study, 42 endophytic actinomycetes were isolated from different organs of seven selected medicinal plants. The highest number of isolates (n = 22, 52.3%) of actinomycetes was isolated from roots, followed by stems (n = 9, 21.4%), leaves (n = 6, 14.2%), flowers (n = 3, 7.1%), and petioles (n = 2, 4.7%). The genus Streptomyces was the most dominant among the isolates (66.6%) in both the locations (Dampa TRF and Phawngpuii NP, Mizoram, India). From a total of 42 isolates, 22 isolates were selected for further studies based on their ability to inhibit one of the tested human bacterial or fungal pathogen. Selected isolates were identified based on 16S rRNA gene analysis and subsequently the isolates were grouped to four different genera; Streptomyces, Brevibacterium, Microbacterium, and Leifsonia. Antibiotic sensitivity assay was performed to understand the responsible antimicrobials present in the isolates showing the antimicrobial activities and revealed that the isolates were mostly resistant to penicillin G and ampicillin. Further, antimicrobial properties and antibiotic sensitivity assay in combination with the results of amplification of biosynthetic genes polyketide synthase (PKS-I) and non-ribosomal peptide synthetase (NRPS) showed that the endophytic actinomycetes associated with the selected medicinal plants have broad-spectrum antimicrobial activity. This is the first report of the isolation of Brevibacterium sp., Microbacterium sp., and Leifsonia xyli from endophytic environments of medicinal plants, Mirabilis jalapa and Clerodendrum colebrookianum. Our results emphasize that endophytic actinomycetes associated with medicinal plants are an unexplored resource for the discovery of biologically active compounds.
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Affiliation(s)
- Ajit K Passari
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
| | - Vineet K Mishra
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science and Technology Jorhat, Assam, India
| | - Vijai K Gupta
- Molecular Glyco-biotechnology Group, Department of Biochemistry, National University of Ireland Galway Galway, Ireland
| | - Bhim P Singh
- Molecular Microbiology and Systematics Laboratory, Department of Biotechnology, Mizoram University Aizawl, India
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Sarma RK, Gogoi A, Dehury B, Debnath R, Bora TC, Saikia R. Community profiling of culturable fluorescent pseudomonads in the rhizosphere of green gram (Vigna radiata L.). PLoS One 2014; 9:e108378. [PMID: 25279790 PMCID: PMC4184808 DOI: 10.1371/journal.pone.0108378] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 08/20/2014] [Indexed: 11/25/2022] Open
Abstract
Study on microbial diversity in the unexplored rhizosphere is important to understand their community structure, biology and ecological interaction with the host plant. This research assessed the genetic and functional diversity of fluorescent pseudomonads [FP] in the green gram rhizophere. One hundred and twenty types of morphologically distinct fluorescent pseudomonads were isolated during vegetative as well as reproductive growth phase of green gram. Rep PCR, ARDRA and RISA revealed two distinct clusters in each case at 75, 61 and 70% similarity coefficient index respectively. 16S rRNA partial sequencing analysis of 85 distantly related fluorescent pseudomonads depicted Pseudomonas aeruginosa as the dominant group. Out of 120 isolates, 23 (19%) showed antagonistic activity towards phytopathogenic fungi. These bacterial isolates showed varied production of salicylic acid, HCN and chitinase, 2, 4-diacetylphloroglucinol (DAPG), phenazine-1-carboxylic acid (PCA) and pyoluteorin (PLT). Production efficiency of inherent level of plant growth promoting (PGP) traits among the 120 isolates demonstrated that 10 (8%) solubilised inorganic phosphates, 25 (20%) produced indoles and 5 (4%) retained ACC deaminase activity. Pseudomonas aeruginosa GGRJ21 showed the highest production of all antagonistic and plant growth promoting (PGP) traits. In a greenhouse experiment, GGRJ21 suppressed root rot disease of green gram by 28-93% (p = 0.05). Consistent up regulation of three important stress responsive genes, i.e., acdS, KatA and gbsA and elevated production efficiency of different PGP traits could promote GGRJ21 as a potent plant growth regulator.
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Affiliation(s)
- Rupak K Sarma
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Animesh Gogoi
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Budheswar Dehury
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, Assam, India
| | - Rajal Debnath
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Tarun C Bora
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Ratul Saikia
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India
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Hussain N, Gogoi A, Sarma RK, Sharma P, Barras A, Boukherroub R, Saikia R, Sengupta P, Das MR. Reduced Graphene Oxide Nanosheets Decorated with Au Nanoparticles as an Effective Bactericide: Investigation of Biocompatibility and Leakage of Sugars and Proteins. Chempluschem 2014. [DOI: 10.1002/cplu.201402240] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Fellahi O, Sarma RK, Das MR, Saikia R, Marcon L, Coffinier Y, Hadjersi T, Maamache M, Boukherroub R. The antimicrobial effect of silicon nanowires decorated with silver and copper nanoparticles. Nanotechnology 2013; 24:495101. [PMID: 24231372 DOI: 10.1088/0957-4484/24/49/495101] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The paper reports on the preparation and antibacterial activity of silicon nanowire (SiNW) substrates coated with Ag or Cu nanoparticles (NPs) against Escherichia coli (E. coli) bacteria. The substrates are easily prepared using the metal-assisted chemical etching of crystalline silicon in hydrofluoric acid/silver nitrate (HF/AgNO3) aqueous solution. Decoration of the SiNWs with metal NPs is achieved by simple immersion in HF aqueous solutions containing silver or copper salts. The SiNWs coated with Ag NPs are biocompatible with human lung adenocarcinoma epithelial cell line A549 while possessing strong antibacterial properties to E. coli. In contrast, the SiNWs decorated with Cu NPs showed higher cytotoxicity and slightly lower antibacterial activity. Moreover, it was also observed that leakage of sugars and proteins from the cell wall of E. coli in interaction with SiNWs decorated with Ag NPs is higher compared to SiNWs modified with Cu NPs.
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Affiliation(s)
- Ouarda Fellahi
- Institut de Recherche Interdisciplinaire (IRI, USR-3078), Université Lille1, Parc de la Haute Borne, 50 avenue de Halley, BP 70478, F-59658 Villeneuve d'Ascq, France. Unité de Développement de la Technologie du Silicium (UDTS), 2, Bd. Frantz Fanon, BP 140 Alger-7 merveilles, Algiers, Algeria. Laboratoire de Physique Quantique et Systèmes Dynamiques, Département de Physique, Université de Sétif, Sétif 19000, Algeria
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Debnath R, Saikia R, Sarma RK, Yadav A, Bora TC, Handique PJ. Psychrotolerant antifungal Streptomyces isolated from Tawang, India and the shift in chitinase gene family. Extremophiles 2013; 17:1045-59. [PMID: 24085523 DOI: 10.1007/s00792-013-0587-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 09/16/2013] [Indexed: 10/26/2022]
Abstract
A total of 210 Streptomyces were isolated from the soil samples of Tawang, India where temperature varied from 5 °C during daytime to -2 °C during the night. Based on antifungal activity, a total of 33 strains, putatively Streptomyces spp., were selected. Optimal growth temperature for the 33 strains was 16 °C, with growth occurring down to 6 °C but not above 30 °C. Phylogenetic analysis based on 16S rDNA sequences revealed the taxonomic affiliation of the 33 strains as species of Streptomyces. To examine the relatedness of the chitinase genes from six strong antifungal Streptomyces strains, a phylogenetic tree was constructed using the catalytic domain nucleotide sequences and resulted in seven distinct monophyletic groups. A quantitative PCR study for chitinase expressing ability revealed that of the six antifungal strains tested, the strain Streptomyces roseochromogenus TSR12 was the most active producer of family 18 chitinase genes. Streptomyces strains with enhanced inhibitory potential usually encode a family 19 chitinase gene; however, our present study did not show expression of this family in the six strains tested.
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Affiliation(s)
- Rajal Debnath
- Biotechnology Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, 785 006, Assam, India
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Das MR, Sarma RK, Borah SC, Kumari R, Saikia R, Deshmukh AB, Shelke MV, Sengupta P, Szunerits S, Boukherroub R. The synthesis of citrate-modified silver nanoparticles in an aqueous suspension of graphene oxide nanosheets and their antibacterial activity. Colloids Surf B Biointerfaces 2013; 105:128-36. [DOI: 10.1016/j.colsurfb.2012.12.033] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 12/22/2012] [Accepted: 12/27/2012] [Indexed: 01/14/2023]
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Kakati D, Sarma RK, Saikia R, Barua NC, Sarma JC. Rapid microwave assisted synthesis and antimicrobial bioevaluation of novel steroidal chalcones. Steroids 2013; 78:321-6. [PMID: 23287649 DOI: 10.1016/j.steroids.2012.12.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 11/30/2012] [Accepted: 12/16/2012] [Indexed: 10/27/2022]
Abstract
A novel class of chalconoyl pregnenolones has been prepared via Claisen-Schmidt condensation under microwave activation and solvent free reaction conditions. The compounds were screened for antimicrobial activity against two bacterial strains Bacillus subtilis and Escherichia coli and two fungal strains Aspergillus niger and Candida albicans. Some of the compounds exhibited significant inhibitory activity against the microbial strains. Presence of the α,β-unsaturated carbonyl moiety in the synthesized compounds was found to be essential for the activity as manipulation of the same through epoxidation of the double bond diminished the activity.
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Affiliation(s)
- Dwipen Kakati
- Natural Products Chemistry Division, CSIR North East Institute of Science & Technology, Jorhat, Assam, India.
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Sarma RK, Debnath R, Saikia R, Handique PJ, Bora TC. Phylogenetic analysis of alkaline proteinase producing fluorescent pseudomonads associated with green gram (Vigna radiata L.) rhizosphere. Folia Microbiol (Praha) 2012; 57:129-37. [PMID: 22374358 DOI: 10.1007/s12223-012-0097-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Accepted: 01/11/2012] [Indexed: 12/01/2022]
Abstract
Fifty fluorescent pseudomonads were isolated from rhizospheric soil of green gram from nearby area of Kaziranga, Assam, India and assayed for their extracellular proteinase production. Out of these isolates, 20 were found to be prominent in proteinase production. Genetic diversity of the 20 isolates were analyzed through BOX-PCR fingerprinting and 16S rDNA-RFLP along with three reference strains, viz., Pseudomonas fluorescens (NCIM2099(T)), Pseudomonas aureofaciens (NCIM2026(T)), and Pseudomonas aeruginosa (MTCC2582(T)). BOX-PCR produced two distinct clusters at 56% similarity coefficient and seven distinct BOX profiles. 16S rDNA-RFLP with three tetra-cutters restriction enzymes (HaeIII, AluI, and MspI) revealed two major clusters A and B; cluster A contained only single isolate FPS9 while the rest of 22 isolates belonged to the cluster B. Based on phenotypic characters and 16S rDNA sequence similarity, all the eight highly proteinase-producing strains were affiliated with P. aeruginosa. The proteinase was extracted from two most prominent strains (KFP1 and KFP2), purified by a three-step process involving (NH(4))(2)SO(4) precipitation, gel filtration, and ion exchange chromatography. The enzyme had an optimal pH of 8.0 and exhibit highest activity at 60°C and 37°C by KFP1 and KFP2 respectively. The specific activities were recorded as 75,050 (for KFP1) and 81,320 U/mg (for KFP2). The purified enzyme was migrated as a single band on native and SDS-PAGE with a molecular mass of 32 kDa. Zn(2+), Cu(2+), and Ni(2+) ion inhibited the enzyme activity. Enzyme activity was also inhibited by EDTA established as their metallo-proteinase nature.
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Affiliation(s)
- Rupak K Sarma
- Biotechnology Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India
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Saikia R, Gogoi D, Mazumder S, Yadav A, Sarma R, Bora T, Gogoi B. Brevibacillus laterosporus strain BPM3, a potential biocontrol agent isolated from a natural hot water spring of Assam, India. Microbiol Res 2011; 166:216-25. [DOI: 10.1016/j.micres.2010.03.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2009] [Revised: 02/28/2010] [Accepted: 03/01/2010] [Indexed: 11/24/2022]
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Medhi N, Das SB, Das RR, Medhi S, Sarma P, Duwara R, Das P, Saikia R. MRI findings of cerebral malaria. A report of two cases. Neuroradiol J 2009; 22:407-12. [PMID: 24207146 DOI: 10.1177/197140090902200408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2009] [Accepted: 07/19/2009] [Indexed: 11/17/2022] Open
Abstract
Cerebral malaria is a protozoal disease affecting the brain caused by Plasmodium falciparum. The hallmark of cerebral malaria is progressive decline in the sensorium leading to coma and in some cases death. MR findings reported in cerebral malaria are diffuse cerebral swelling / edema, bilateral nearly symmetrical T2 hyperintense lesions in basal ganglia and similar lesions in thalamus, pons and cerebellum. The imaging findings of cerebral malaria depend on the duration of the illness and time of MR examination. We describe two patients of cerebral malaria having mixed Plasmodium falciparum and Plasmodium vivex infestation showing bilateral basal ganglia infarcts with cerebral swelling in one patient and bilateral basal ganglia and cerebellar lesions in the other.
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Affiliation(s)
- N Medhi
- Radiology Department, Primus, International Hospital, Sanjeevani Hospital; Guwahati, India -
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Medhi N, Goswami P, Sarma P, Barkataky RK, Duarah R, Saikia R. Klebsiella meningitis. A case report. Neuroradiol J 2008; 21:323-6. [PMID: 24256900 DOI: 10.1177/197140090802100305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Accepted: 04/09/2008] [Indexed: 11/16/2022] Open
Abstract
Acute bacterial meningitis is a severe CNS infection occurring mostly in infants and older children. Bacterial meningitis caused by gram-negative bacteria is usually fatal. Klebsiella pneumoniae is an uncommon gram-negative bacteria causing meningitis with a poor outcome. Though the commonest presentation of bacterial meningitis is fever, patients usually seek medical attention for uncontrolled seizure and features of raised ICP. The commonest complications of gram-negative bacterial meningitis including Klebsiella meningitis are subdural hygroma / empyema, hydrocephalus, infarcts (both arterial and venous) and cortical blindness due to hypoxic ischaemic insult. MRI is the best modality for evaluating these patients for early diagnosis. Early institution of treatment significantly reduces the mortality and morbidity. We describe a case of acute bacterial meningitis caused by Klebsiella pneumoniae with MR evidence of sinus thrombosis, venous infarcts and subdural hygroma.
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Affiliation(s)
- N Medhi
- Radiology Department, Primus, Guwahati; Assam; India -
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Gogoi D, Mazumder S, Saikia R, Bora T. Impact of submerged culture conditions on growth and bioactive metabolite produced by endophyte Hypocrea spp. NSF-08 isolated from Dillenia indica Linn. in North-East India. J Mycol Med 2008. [DOI: 10.1016/j.mycmed.2007.10.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Saikia R, Varghese S, Singh BP, Arora DK. Influence of mineral amendment on disease suppressive activity of Pseudomonas fluorescens to Fusarium wilt of chickpea. Microbiol Res 2007; 164:365-73. [PMID: 17604612 DOI: 10.1016/j.micres.2007.05.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Revised: 05/09/2007] [Accepted: 05/10/2007] [Indexed: 11/29/2022]
Abstract
Fusarium wilt caused by Fusarium oxysporum f. sp. ciceri causes considerable yield loss of chickpea. Pseudomonas fluorescens4-92 (Pf4-92) strain can suppress the disease. Amendment of zinc EDTA and copper EDTA could not suppress the disease significantly when used alone; however, they significantly suppressed the disease in presence of Pf4-92. In vitro observation showed that at 40, 30 and 20microgml(-1) concentrations of these minerals, i.e. Zn, Cu and Zn plus Cu, respectively, completely repressed the production of the phytotoxin, fusaric acid (FA). FA concentration (0.5microgml(-1)) has been shown to suppress the production of 2,4-diacetylphloroglucinol (DAPG) by Pf4-92, and DAPG, salicylic acid, pyochelin and pyoluteorin production was enhanced by these mineral amendments. In rockwool bioassays, Zn, Cu and Zn plus Cu amendments reduced FA production and enhanced DAPG production. This study demonstrates that Zn and Cu enhance biocontrol activity by reducing FA produced by the pathogen, F. oxysporum f. sp. ciceri.
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Affiliation(s)
- Ratul Saikia
- National Bureau of Agriculturally Important Microorganisms (NBAIM), Kushmaur, Mau 275 101, Uttar Pradesh, India.
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Gogoi DK, Deka Boruah HP, Saikia R, Bora TC. Optimization of process parameters for improved production of bioactive metabolite by a novel endophytic fungus Fusarium sp. DF2 isolated from Taxus wallichiana of North East India. World J Microbiol Biotechnol 2007. [DOI: 10.1007/s11274-007-9442-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Saikia R, Kumar R, Arora DK, Gogoi DK, Azad P. Pseudomonas aeruginosa inducing rice resistance against Rhizoctonia solani: production of salicylic acid and peroxidases. Folia Microbiol (Praha) 2007; 51:375-80. [PMID: 17176755 DOI: 10.1007/bf02931579] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Three isolates of Pseudomonas aeruginosa were used for seed treatment of rice; all showed plant growth promoting activity and induced systemic resistance in rice against Rhizoctonia solani G5 and increased seed yield. Production of salicylic acid (Sal) by P. aeruginosa both in vitro and in vivo was quantified with high performance liquid chromatography. All three isolates produced more Sal in King's B broth than in induced roots. Using a split root system, more Sal accumulated in root tissues of bacterized site than in distant roots on the opposite site of the root system after 1 d, but this difference decreased after 3 d. Sal concentration 0-200 g/L showed no inhibition of mycelial growth of R. solani in vitro, while at > or =300 g/L it inhibited it. P. aeruginosa-pretreated rice plants challenged inoculation with R. solani (as pathogen), an additional increase in the accumulation of peroxidase was observed. Three pathogenesis-related peroxidases in induced rice plants were detected; molar mass of these purified peroxidases was 28, 36 and 47 kDa. Purified peroxidase showed antifungal activity against phytopathogenic fungi R. solani, Pyricularia oryzae and Helminthosporium oryzae.
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Affiliation(s)
- R Saikia
- Laboratory of Applied Mycology, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, India.
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Saikia R, Srivastava AK, Singh K, Arora DK, Lee MW. Effect of Iron Availability on Induction of Systemic Resistance to Fusarium Wilt of Chickpea by Pseudomonas spp. Mycobiology 2005; 33:35-40. [PMID: 24049472 PMCID: PMC3774855 DOI: 10.4489/myco.2005.33.1.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2004] [Indexed: 06/02/2023]
Abstract
Selected isolates of Pseudomonas fluorescens (Pf4-92 and PfRsC5) and P. aeruginosa (PaRsG18 and PaRsG27) were examined for growth promotion and induced systemic resistance against Fusarium wilt of chickpea. Significant increase in plant height was observed in Pseudomonas treated plants. However, plant growth was inhibited when isolates of Pseudomonas were used in combination with Fusarium oxysporum f. sp. ciceri (FocRs1). It was also observed that the Pseudomonas spp. was colonized in root of chickpea and significantly suppressed the disease in greenhouse condition. Rock wool bioassay technique was used to study the effect of iron availability on the induction of systemic resistance to Fusarium wilt of chickpea mediated by the Pseudomonas spp. All the isolates of Pseudomonas spp. showed greater disease control in the induced systemic resistance (ISR) bioassay when iron availability in the nutrient solution was low. High performance liquid chromatography (HPLC) analysis indicated that all the bacterial isolates produced more salicylic acid (SA) at low iron (10µM EDDHA) than high iron availability (10µFe(3+) EDDHA). Except PaRsG27, all the three isolates produced more pseudobactin at low iron than high iron availability.
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Affiliation(s)
- Ratul Saikia
- National Bureau of Agriculturally Important Microorganisms (NBAIM), Kushmaur, Mau - 275101, UP, India
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Singh T, Saikia R, Jana T, Arora DK. Hydrophobicity and surface electrostatic charge of conidia of the mycoparasitic Trichoderma species. Mycol Prog 2004. [DOI: 10.1007/s11557-006-0092-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Saikia R, Singh T, Kumar R, Srivastava J, Srivastava AK, Singh K, Arora DK. Role of salicylic acid in systemic resistance induced by Pseudomonas fluorescens against Fusarium oxysporum f. sp. ciceri in chickpea. Microbiol Res 2003; 158:203-13. [PMID: 14521230 DOI: 10.1078/0944-5013-00202] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Selected isolates of Pseudomonas fluorescens (Pf1-94, Pf4-92, Pf12-94, Pf151-94 and Pf179-94) and chemical resistance inducers (salicylic acid, acetylsalicylic acid, DL-norvaline, indole-3-carbinol and lichenan) were examined for growth promotion and induced systemic resistance against Fusarium wilt of chickpea. A marked increase in shoot and root length was observed in P. fluorescens treated plants. The isolates of P. fluorescens systemically induced resistance against Fusarium wilt of chickpea caused by Fusarium. oxysporum f.sp. ciceri (FocRs1), and significantly (P = 0.05) reduced the wilt disease by 26-50% as compared to control. Varied degree of protection against Fusarium wilt was recorded with chemical inducers. The reduction in disease was more pronounced when chemical inducers were applied with P. fluorescens. Among chemical inducers, SA showed the highest protection of chickpea seedlings against wilting. Fifty two- to 64% reduction of wilting was observed in soil treated with isolate Pf4-92 along with chemical inducers. A significant (P = 0.05; r = -0.946) negative correlation was observed in concentration of salicylic acid and mycelial growth of FocRs1 and at a concentration of 2000 microg ml(-1) mycelial growth was completely arrested. Exogenously supplied SA also stimulated systemic resistance against wilt and reduced the disease severity by 23% and 43% in the plants treated with 40 and 80 microg ml(-1) of SA through root application. All the isolates of P. fluorescens produced SA in synthetic medium and in root tissues. HPLC analysis indicated that Pf4-92 produced comparatively more SA than the other isolates. 1700 to 2000 nanog SA g(-1) fresh root was detected from the application site of root after one day of bacterization whereas, the amount of SA at distant site ranged between 400-500 nanog. After three days of bacterization the SA level decreased and was found more or less equal at both the detection sites.
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Affiliation(s)
- Ratul Saikia
- Laboratory of Applied Mycology, Centre of Advanced study in Botany, Banaras Hindu University, Varanasi 221005, India
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