1
|
Kumar RR, Niraj RK, Goswami S, Thimmegowda V, Mishra GP, Mishra D, Rai GK, Kumar SN, Viswanathan C, Tyagi A, Singh GP, Rai AK. Characterization of putative calcium-dependent protein kinase-1 ( TaCPK-1) gene: hubs in signalling and tolerance network of wheat under terminal heat. 3 Biotech 2024; 14:150. [PMID: 38725866 PMCID: PMC11076446 DOI: 10.1007/s13205-024-03989-6] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 04/15/2024] [Indexed: 05/12/2024] Open
Abstract
Calcium-dependent protein kinase (CDPK) is member of one of the most important signalling cascades operating inside the plant system due to its peculiar role as thermo-sensor. Here, we identified 28 full length putative CDPKs from wheat designated as TaCDPK (1-28). Based on digital gene expression, we cloned full length TaCPK-1 gene of 1691 nucleotides with open reading frame (ORF) of 548 amino acids (accession number OP125853). The expression of TaCPK-1 was observed maximum (3.1-fold) in leaf of wheat cv. HD2985 (thermotolerant) under T2 (38 ± 3 °C, 2 h), as compared to control. A positive correlation was observed between the expression of TaCPK-1 and other stress-associated genes (MAPK6, CDPK4, HSFA6e, HSF3, HSP17, HSP70, SOD and CAT) involved in thermotolerance. Global protein kinase assay showed maximum activity in leaves, as compared to root, stem and spike under heat stress. Immunoblot analysis showed abundance of CDPK protein in wheat cv. HD2985 (thermotolerant) in response to T2 (38 ± 3 °C, 2 h), as compared to HD2329 (thermosusceptible). Calcium ion (Ca2+), being inducer of CDPK, showed strong Ca-signature in the leaf tissue (Ca-622 ppm) of thermotolerant wheat cv. under heat stress, whereas it was minimum (Ca-201 ppm) in spike tissue. We observed significant variations in the ionome of wheat under HS. To conclude, TaCPK-1 plays important role in triggering signaling network and in modulation of HS-tolerance in wheat. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-024-03989-6.
Collapse
Affiliation(s)
- Ranjeet R. Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Ravi K. Niraj
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Vinutha Thimmegowda
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Gyan P. Mishra
- Division of Seed Technology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Dwijesh Mishra
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, 110012 India
| | - Gyanendra K. Rai
- Sher-E-Kashmir University of Agricultural Science and Technology, Chatta, Jammu, 180009 India
| | | | - Chinnusamy Viswanathan
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Aruna Tyagi
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Gyanendra P. Singh
- ICAR-National Bureau of Plant Genetic Resources, New Delhi, 110012 India
| | - Anil K. Rai
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, 110012 India
| |
Collapse
|
2
|
Kumar RR, Dubey K, Goswami S, Rai GK, Rai PK, Salgotra RK, Bakshi S, Mishra D, Mishra GP, Chinnusamy V. Transcriptional Regulation of Small Heat Shock Protein 17 (sHSP-17) by Triticum aestivum HSFA2h Transcription Factor Confers Tolerance in Arabidopsis under Heat Stress. Plants (Basel) 2023; 12:3598. [PMID: 37896061 PMCID: PMC10609734 DOI: 10.3390/plants12203598] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 08/29/2023] [Accepted: 08/29/2023] [Indexed: 10/29/2023]
Abstract
Heat shock transcription factors (HSFs) contribute significantly to thermotolerance acclimation. Here, we identified and cloned a putative HSF gene (HSFA2h) of 1218 nucleotide (acc. no. KP257297.1) from wheat cv. HD2985 using a de novo transcriptomic approach and predicted sHSP as its potential target. The expression of HSFA2h and its target gene (HSP17) was observed at the maximum level in leaf tissue under heat stress (HS), as compared to the control. The HSFA2h-pRI101 binary construct was mobilized in Arabidopsis, and further screening of T3 transgenic lines showed improved tolerance at an HS of 38 °C compared with wild type (WT). The expression of HSFA2h was observed to be 2.9- to 3.7-fold higher in different Arabidopsis transgenic lines under HS. HSFA2h and its target gene transcripts (HSP18.2 in the case of Arabidopsis) were observed to be abundant in transgenic Arabidopsis plants under HS. We observed a positive correlation between the expression of HSFA2h and HSP18.2 under HS. Evaluation of transgenic lines using different physio-biochemical traits linked with thermotolerance showed better performance of HS-treated transgenic Arabidopsis plants compared with WT. There is a need to further characterize the gene regulatory network (GRN) of HSFA2h and sHSP in order to modulate the HS tolerance of wheat and other agriculturally important crops.
Collapse
Affiliation(s)
- Ranjeet R Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi 110012, India
| | - Kavita Dubey
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi 110012, India
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi 110012, India
| | - Gyanendra K Rai
- School of Biotechnology, Sher-e-Kashmir University of Agricultural University of Jammu (J&K), Jammu 180009, India
| | - Pradeep K Rai
- School of Biotechnology, Sher-e-Kashmir University of Agricultural University of Jammu (J&K), Jammu 180009, India
| | - Romesh K Salgotra
- School of Biotechnology, Sher-e-Kashmir University of Agricultural University of Jammu (J&K), Jammu 180009, India
| | - Suman Bakshi
- Nuclear Agriculture & Biotechnology Division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India
| | - Dwijesh Mishra
- Centre for Agricultural Bio-Informatics, Indian Agricultural Statistics Research Institute, New Delhi 110012, India
| | - Gyan P Mishra
- Division of Seed Technology, Indian Agricultural Research Institute, New Delhi 110012, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi 110012, India
| |
Collapse
|
3
|
Rai GK, Bhat BA, Mushtaq M, Tariq L, Rai PK, Basu U, Dar AA, Islam ST, Dar TUH, Bhat JA. Insights into decontamination of soils by phytoremediation: A detailed account on heavy metal toxicity and mitigation strategies. Physiol Plant 2021; 173:287-304. [PMID: 33864701 DOI: 10.1111/ppl.13433] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/19/2021] [Accepted: 02/23/2021] [Indexed: 06/12/2023]
Abstract
In the current era of rapid industrialization, the foremost challenge is the management of industrial wastes. Activities such as mining and industrialization spill over a large quantity of toxic waste that pollutes soil, water, and air. This poses a major environmental and health challenge. The toxic heavy metals present in the soil and water are entering the food chain, which in turn causes severe health hazards. Environmental clean-up and reclamation of heavy metal contaminated soil and water are very important, and it necessitates efforts of environmentalists, industrialists, scientists, and policymakers. Phytoremediation is a plant-based approach to remediate heavy metal/organic pollutant contaminated soil and water in an eco-friendly, cost-effective, and permanent way. This review covers the effect of heavy metal toxicity on plant growth and physiological process, the concept of heavy metal accumulation, detoxification, and the mechanisms of tolerance in plants. Based on plants' ability to uptake heavy metals and metabolize them within tissues, phytoremediation techniques have been classified into six types: phytoextraction, phytoimmobilization, phytovolatilization, phytodegradation, rhizofiltration, and rhizodegradation. The development of research in this area led to the identification of metal hyper-accumulators, which could be utilized for reclamation of contaminated soil through phytomining. Concurrently, breeding and biotechnological approaches can enhance the remediation efficiency. Phytoremediation technology, combined with other reclamation technologies/practices, can provide clean soil and water to the ecosystem.
Collapse
Affiliation(s)
- Gyanendra K Rai
- School of Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Jammu, India
| | - Basharat A Bhat
- Department of Bioresources, University of Kashmir, Jammu and Kashmir, India
| | - Muntazir Mushtaq
- School of Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Jammu, India
| | - Lubna Tariq
- Department of Biotechnology, BGSB University, Jammu and Kashmir, India
| | - Pradeep K Rai
- Advance Center for Horticulture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Jammu, India
| | - Umer Basu
- Division of Pathology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Jammu, India
| | - Aejaz A Dar
- School of Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Jammu, India
| | - Sheikh T Islam
- Department of Bioresources, University of Kashmir, Jammu and Kashmir, India
| | - Tanvir U H Dar
- Department of Biotechnology, BGSB University, Jammu and Kashmir, India
| | - Javaid A Bhat
- Ministry of Agriculture (MOA) Key Laboratory of Biology and Genetic Improvement of Soybean (General), State Key Laboratory for Crop Genetics and Germplasm Enhancement, Soybean Research Institute, National Center for Soybean Improvement, Nanjing Agricultural University, Nanjing, China
| |
Collapse
|
4
|
Kumar RR, Bhargava DV, Pandit K, Goswami S, Mukesh Shankar S, Singh SP, Rai GK, Tara Satyavathi C, Praveen S. Lipase - The fascinating dynamics of enzyme in seed storage and germination - A real challenge to pearl millet. Food Chem 2021; 361:130031. [PMID: 34058661 DOI: 10.1016/j.foodchem.2021.130031] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 11/13/2019] [Revised: 05/04/2021] [Accepted: 05/05/2021] [Indexed: 11/18/2022]
Abstract
Pearl millet is considered as 'nutri-cereal' because of high nutrient density of the seeds. The grain has limited use because of low keeping quality of the flour due to the activities of rancidity causing enzymes like lipase, lox, pox and PPO. Among all the enzymes, lipase is most notorious because of its robust nature and high activity under different conditions. we have identified 2180 putative transcripts showing homology with different variants of lipase precursor through transcriptome data mining (NCBI BioProject acc. no. PRJNA625418). Lipase plays dual role of facilitating the germination of seeds and deteriorating the quality of the pearl millet flour through hydrolytic rancidity. Different physiochemical methods like heat treatment, micro oven, hydrothermal, etc. have been developed to inhibit lipase activity in pearl millet flour. There is further need to develop improved processing technologies to inhibit the hydrolytic and oxidative rancidity in the floor with enhanced shelf-life.
Collapse
Affiliation(s)
- Ranjeet R Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi Pin 110012, India.
| | - D V Bhargava
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi Pin 110012, India
| | - Kangkan Pandit
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi Pin 110012, India
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi Pin 110012, India
| | - S Mukesh Shankar
- Division of Genetics, Indian Agricultural Research Institute, New Delhi Pin 110012, India
| | - Sumer P Singh
- Division of Genetics, Indian Agricultural Research Institute, New Delhi Pin 110012, India
| | - Gyanendra K Rai
- Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Pin 180009, India
| | - C Tara Satyavathi
- All India Coordinated Research Project on Pearl Millet, Jodhpur, Rajasthan Pin 342304, India
| | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi Pin 110012, India.
| |
Collapse
|
5
|
Kumar RR, Dubey K, Arora K, Dalal M, Rai GK, Mishra D, Chaturvedi KK, Rai A, Kumar SN, Singh B, Chinnusamy V, Praveen S. Characterizing the putative mitogen-activated protein kinase ( MAPK) and their protective role in oxidative stress tolerance and carbon assimilation in wheat under terminal heat stress. Biotechnol Rep (Amst) 2021; 29:e00597. [PMID: 33659194 PMCID: PMC7890154 DOI: 10.1016/j.btre.2021.e00597] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 12/15/2020] [Revised: 01/28/2021] [Accepted: 02/03/2021] [Indexed: 12/18/2022]
Abstract
Wheat, being sensitive to terminal heat, causes drastic reduction in grain quality and yield. MAPK cascade regulates the network of defense mechanism operated inside plant system. Here, we have identified 21 novel MAPKs through gel-based proteomics and RNA-seq data analysis. Based on digital gene expression, two transcripts (transcript_2834 and transcript_8242) showing homology with MAPK were cloned and characterized from wheat (acc. nos. MK854806 and KT835664). Transcript_2834 was cloned in pET28a vector and recombinant MAPK protein of ∼40.3 kDa was isolated and characterized to have very high in-vitro kinase activity under HS. Native MAPK showed positive correlation with the expression of TFs, HSPs, genes linked with antioxidant enzyme (SOD, CAT, GPX), photosynthesis and starch biosynthesis pathways in wheat under HS. Wheat cv. HD3086 (thermotolerant) having higher expression and activity of MAPK under HS showed significant increase in accumulation of proline, H2O2, starch, and granule integrity, compared with BT-Schomburgk (thermosusceptible).
Collapse
Affiliation(s)
- Ranjeet R Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Kavita Dubey
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Kirti Arora
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Monika Dalal
- ICAR-National Institute for Plant Biotechnology, Pusa Campus, New Delhi, 110012, India
| | - Gyanendra K Rai
- Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, 180009, India
| | - Dwijesh Mishra
- CABin, Indian Agricultural Statistics Research Institute, New Delhi, 110012, India
| | - Krishna K Chaturvedi
- CABin, Indian Agricultural Statistics Research Institute, New Delhi, 110012, India
| | - Anil Rai
- CABin, Indian Agricultural Statistics Research Institute, New Delhi, 110012, India
| | - Soora Naresh Kumar
- Centre for Environment Science and Climate Resilient Agriculture (CESCRA), Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Bhupinder Singh
- Centre for Environment Science and Climate Resilient Agriculture (CESCRA), Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| |
Collapse
|
6
|
Kumar RR, Dubey K, Goswami S, Hasija S, Pandey R, Singh PK, Singh B, Sareen S, Rai GK, Singh GP, Singh AK, Chinnusamy V, Praveen S. Heterologous expression and characterization of novel manganese superoxide dismutase (Mn-SOD) – A potential biochemical marker for heat stress-tolerance in wheat (Triticum aestivum). Int J Biol Macromol 2020; 161:1029-1039. [DOI: 10.1016/j.ijbiomac.2020.06.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 06/02/2020] [Accepted: 06/03/2020] [Indexed: 12/15/2022]
|
7
|
Kumar RR, Hasija S, Goswami S, Tasleem M, Sakhare A, Kumar S, Bakshi S, Jambhulkar S, Rai GK, Singh B, Singh GP, Pathak H, Viswanathan C, Praveen S. Gamma irradiation protect the developing wheat endosperm from oxidative damage by balancing the trade-off between the defence network and grains quality. Ecotoxicol Environ Saf 2019; 174:637-648. [PMID: 30875557 DOI: 10.1016/j.ecoenv.2019.03.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 11/08/2018] [Revised: 03/03/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Gamma irradiation has been reported to modulate the biochemical and molecular parameters associated with the tolerance of plant species under biotic/ abiotic stress. Wheat is highly sensitive to heat stress (HS), as evident from the decrease in the quantity and quality of the total grains. Here, we studied the effect of pre-treatment of wheat dry seeds with different doses of gamma irradiation (0.20, 0.25 and 0.30 kGy) on tolerance level and quality of developing wheat endospermic tissue under HS (38 °C, 1 h; continuously for three days). Expression analysis of genes associated with defence and starch metabolism in developing grains showed maximum transcripts of HSP17 (in response to 0.25 kGy + HS) and AGPase (under 0.30 kGy), as compared to control. Gamma irradiation was observed to balance the accumulation of H2O2 by enhancing the activities of SOD and GPx in both the cvs. under HS. Gamma irradiation was observed to stabilize the synthesis of starch and amylose by regulating the activities of AGPase, SSS and α-amylase under HS. The appearance of isoforms of gliadins (α, β, γ, ω) were observed more in gamma irradiated seeds (0.20 kGy), as compared to control. Gamma irradiation (0.25 kGy in HD3118 & 0.20 kGy in HD3086) was observed to have positive effect on the width, length and test seed weight of the grains under HS. The information generated in present investigation provides easy, cheap and user-friendly technology to mitigate the effect of terminal HS on the grain-development process of wheat along with development of robust seeds with high nutrient density.
Collapse
Affiliation(s)
- Ranjeet R Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Sumedha Hasija
- Division of Biochemistry, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Mohd Tasleem
- Division of Biochemistry, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Akshay Sakhare
- Division of Plant Physiology, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Sudhir Kumar
- Division of Plant Physiology, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Suman Bakshi
- Department of Atomic Energy, Bhabha Atomic Research Center, Mumbai, India.
| | - Sanjay Jambhulkar
- Department of Atomic Energy, Bhabha Atomic Research Center, Mumbai, India.
| | - Gyanendra K Rai
- Sher-e-Kashmir University of Agricultural Sciences and Technology, Chatta, Jammu 180009, India.
| | - Bhupinder Singh
- Centre for Environment Science and Climate Resilient Agriculture (CESCRA), Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Gyanendra P Singh
- Indian Institute of Wheat and Barley Research (IIWBR), Karnal, Haryana, India.
| | | | - Chinnusamy Viswanathan
- Division of Plant Physiology, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
| |
Collapse
|
8
|
Kumar RR, Singh K, Ahuja S, Tasleem M, Singh I, Kumar S, Grover M, Mishra D, Rai GK, Goswami S, Singh GP, Chinnusamy V, Rai A, Praveen S. Quantitative proteomic analysis reveals novel stress-associated active proteins (SAAPs) and pathways involved in modulating tolerance of wheat under terminal heat. Funct Integr Genomics 2018; 19:329-348. [PMID: 30465139 DOI: 10.1007/s10142-018-0648-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [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: 08/29/2018] [Revised: 11/14/2018] [Accepted: 11/14/2018] [Indexed: 02/06/2023]
Abstract
Terminal heat stress has detrimental effect on the growth and yield of wheat. Very limited information is available on heat stress-associated active proteins (SAAPs) in wheat. Here, we have identified 159 protein groups with 4271 SAAPs in control (22 ± 3 °C) and HS-treated (38 °C, 2 h) wheat cvs. HD2985 and HD2329 using iTRAQ. We identified 3600 proteins to be upregulated and 5825 proteins to be downregulated in both the wheat cvs. under HS. We observed 60.3% of the common SAAPs showing upregulation in HD2985 (thermotolerant) and downregulation in HD2329 (thermosusceptible) under HS. GO analysis showed proton transport (molecular), photosynthesis (biological), and ATP binding (cellular) to be most altered under HS. Most of the SAAPs identified were observed to be chloroplast localized and involved in photosynthesis. Carboxylase enzyme was observed most abundant active enzymes in wheat under HS. An increase in the degradative isoenzymes (α/β-amylases) was observed, as compared to biosynthesis enzymes (ADP-glucophosphorylase, soluble starch synthase, etc.) under HS. Transcript profiling showed very high relative fold expression of HSP17, CDPK, Cu/Zn SOD, whereas downregulation of AGPase, SSS under HS. The identified SAAPs can be used for targeted protein-based precision wheat-breeding program for the development of 'climate-smart' wheat.
Collapse
Affiliation(s)
- Ranjeet R Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India.
| | - Khushboo Singh
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Sumedha Ahuja
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Mohd Tasleem
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Indra Singh
- CABin, Indian Agricultural Statistical Research Institute (IASRI), Pusa, New Delhi, 110012, India
| | - Sanjeev Kumar
- CABin, Indian Agricultural Statistical Research Institute (IASRI), Pusa, New Delhi, 110012, India
| | - Monendra Grover
- CABin, Indian Agricultural Statistical Research Institute (IASRI), Pusa, New Delhi, 110012, India
| | - Dwijesh Mishra
- CABin, Indian Agricultural Statistical Research Institute (IASRI), Pusa, New Delhi, 110012, India
| | - Gyanendra K Rai
- Sher-E-Kashmir University of Agriculture Science and Technology, Chatta, Jammu and Kashmir, 180009, India
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Gyanendra P Singh
- Indian Institute of Wheat and Barley Research, Karnal, Haryana, 132001, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Anil Rai
- CABin, Indian Agricultural Statistical Research Institute (IASRI), Pusa, New Delhi, 110012, India
| | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India.
| |
Collapse
|
9
|
Kumar RR, Goswami S, Singh K, Dubey K, Rai GK, Singh B, Singh S, Grover M, Mishra D, Kumar S, Bakshi S, Rai A, Pathak H, Chinnusamy V, Praveen S. Characterization of novel heat-responsive transcription factor (TaHSFA6e) gene involved in regulation of heat shock proteins (HSPs) - A key member of heat stress-tolerance network of wheat. J Biotechnol 2018; 279:1-12. [PMID: 29746879 DOI: 10.1016/j.jbiotec.2018.05.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [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: 01/07/2018] [Revised: 05/06/2018] [Accepted: 05/07/2018] [Indexed: 11/16/2022]
Abstract
Heat stress has an adverse effect on the quality and quantity of agriculturally important crops, especially wheat. The tolerance mechanism has not been explored much in wheat and very few genes/ TFs responsive to heat stress is available on public domain. Here, we identified, cloned and characterized a putative TaHSFA6e TF gene of 1.3 kb from wheat cv. HD2985. We observed an ORF of 368 aa with Hsf DNA binding signature domain in the amino acid sequence. Single copy number of TaHSFA6e was observed integrated in the genome of wheat. Expression analysis of TaHSFA6e under differential HS showed maximum transcripts in wheat cv. Halna (thermotolerant) in response to 38 °C for 2 h during pollination and grain-filling stages, as compared to PBW343, HD2329 and HD2985. Putative target genes of TaHSFA6e (HSP17, HSP70 and HSP90) showed upregulation in response to differential HS (30 & 38 °C, 2 h) during pollination and grain-filling stages. Small HSP17 was observed most triggered in Halna under HS. We observed increase in the catalase, guaiacol peroxidase, total antioxidant capacity (TAC), and decrease in the lipid peroxidation in thermotolerant cvs. (Halna, HD2985), as compared to thermosusceptible (PBW343, HD2329) under differential HS. Multiple stresses (heat - 38 °C, 2 h, and drought - 100 mL of 20% polyethylene Glycol 6000) during seedling stage of wheat showed positive correlation between the expression of TaHSFA6e, putative targets (HSP70, HSP90, HSP17) and TAC. Halna (thermotolerant) performed better, as compared to other contrasting cvs. TaHSFA6e TF can be used as promising candidate gene for manipulating the heat stress-tolerance network.
Collapse
Affiliation(s)
- Ranjeet R Kumar
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India.
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Khushboo Singh
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Kavita Dubey
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Gyanendra K Rai
- Sher-E-Kashmir University of Science and Technology, Chatta, Jammu and Kashmir, 180009, India
| | - Bhupinder Singh
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Shivdhar Singh
- Centre for Environment Science and Climate Resilient Agriculture (CESCRA), Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Monendra Grover
- CABin, Indian Agricultural Statistical Research Institute, ICAR, New Delhi, 110012, India
| | - Dwijesh Mishra
- CABin, Indian Agricultural Statistical Research Institute, ICAR, New Delhi, 110012, India
| | - Sanjeev Kumar
- CABin, Indian Agricultural Statistical Research Institute, ICAR, New Delhi, 110012, India
| | - Suman Bakshi
- Department of Atomic Energy, Babha Atomic Research Center, Mumbai, 400085, India
| | - Anil Rai
- CABin, Indian Agricultural Statistical Research Institute, ICAR, New Delhi, 110012, India
| | - Himanshu Pathak
- Central Rice Research Institute, Cuttack, Odisha, 753006, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012, India.
| |
Collapse
|
10
|
Kumar RR, Goswami S, Shamim M, Mishra U, Jain M, Singh K, Singh JP, Dubey K, Singh S, Rai GK, Singh GP, Pathak H, Chinnusamy V, Praveen S. Biochemical Defense Response: Characterizing the Plasticity of Source and Sink in Spring Wheat under Terminal Heat Stress. Front Plant Sci 2017; 8:1603. [PMID: 28979274 PMCID: PMC5611565 DOI: 10.3389/fpls.2017.01603] [Citation(s) in RCA: 17] [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] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 08/31/2017] [Indexed: 05/11/2023]
Abstract
Wheat is highly prone to terminal heat stress (HS) under late-sown conditions. Delayed- sowing is one of the preferred methods to screen the genotypes for thermotolerance under open field conditions. We investigated the effect of terminal HS on the thermotolerance of four popular genotypes of wheat i.e. WR544, HD2967, HD2932, and HD2285 under field condition. We observed significant variations in the biochemical parameters like protein content, antioxidant activity, proline and total reducing sugar content in leaf, stem, and spike under normal (26 ± 2°C) and terminal HS (36 ± 2°C) conditions. Maximum protein, sugars and proline was observed in HD2967, as compared to other cultivars under terminal HS. Wheat cv. HD2967 showed more adaptability to the terminal HS. Differential protein-profiling in leaves, stem and spike of HD2967 under normal (26 ± 2°C) and terminal HS (36 ± 2°C) showed expression of some unique protein spots. MALDI-TOF/MS analysis showed the DEPs as RuBisCO (Rub), RuBisCO activase (Rca), oxygen evolving enhancer protein (OEEP), hypothetical proteins, etc. Expression analysis of genes associated with photosynthesis (Rub and Rca) and starch biosynthesis pathway (AGPase, SSS and SBE) showed significant variations in the expression under terminal HS. HD2967 showed better performance, as compared to other cultivars under terminal HS. SSS activity observed in HD2967 showed more stability under terminal HS, as compared with other cultivars. Triggering of different biochemical parameters in response to terminal HS was observed to modulate the plasticity of carbon assimilatory pathway. The identified DEPs will enrich the proteomic resources of wheat and will provide a potential biochemical marker for screening wheat germplasm for thermotolerance. The model hypothesized will help the researchers to work in a more focused way to develop terminal heat tolerant wheat without compromising with the quality and quantity of grains.
Collapse
Affiliation(s)
- Ranjeet R. Kumar
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
- *Correspondence: Ranjeet R. Kumar
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Mohammed Shamim
- Department of Molecular Biology and Genetic Engineering, Bihar Agricultural UniversityBhagalpur, India
| | - Upama Mishra
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Monika Jain
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Khushboo Singh
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Jyoti P. Singh
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Kavita Dubey
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Shweta Singh
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Gyanendra K. Rai
- Sher-e-Kashmir University of Agricultural Sciences and TechnologyJammu, India
| | - Gyanendra P. Singh
- Indian Institute of Wheat and Barley Research, Indian Council of Agricultural ResearchKarnal, India
| | | | | | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
- Shelly Praveen
| |
Collapse
|
11
|
Kumar RR, Goswami S, Singh K, Dubey K, Singh S, Sharma R, Verma N, Kala YK, Rai GK, Grover M, Mishra DC, Singh B, Pathak H, Chinnusamy V, Rai A, Praveen S. Identification of Putative RuBisCo Activase (TaRca1)-The Catalytic Chaperone Regulating Carbon Assimilatory Pathway in Wheat (Triticum aestivum) under the Heat Stress. Front Plant Sci 2016; 7:986. [PMID: 27462325 PMCID: PMC4940427 DOI: 10.3389/fpls.2016.00986] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 06/21/2016] [Indexed: 05/12/2023]
Abstract
RuBisCo activase (Rca) is a catalytic chaperone involved in modulating the activity of RuBisCo (key enzyme of photosynthetic pathway). Here, we identified eight novel transcripts from wheat through data mining predicted to be Rca and cloned a transcript of 1.4 kb from cv. HD2985, named as TaRca1 (GenBank acc. no. KC776912). Single copy number of TaRca1 was observed in wheat genome. Expression analysis in diverse wheat genotypes (HD2985, Halna, PBW621, and HD2329) showed very high relative expression of TaRca1 in Halna under control and HS-treated, as compared to other cultivars at different stages of growth. TaRca1 protein was predicted to be chloroplast-localized with numerous potential phosphorylation sites. Northern blot analysis showed maximum accumulation of TaRca1 transcript in thermotolerant cv. during mealy-ripe stage, as compared to thermosusceptible. Decrease in the photosynthetic parameters was observed in all the cultivars, except PBW621 in response to HS. We observed significant increase in the Rca activity in all the cultivars under HS at different stages of growth. HS causes decrease in the RuBisCo activity; maximum reduction was observed during pollination stage in thermosusceptible cvs. as validated through immunoblotting. We observed uniform carbon distribution in different tissues of thermotolerant cvs., as compared to thermosusceptible. Similarly, tolerance level of leaf was observed maximum in Halna having high Rca activity under HS. A positive correlation was observed between the transcript and activity of TaRca1 in HS-treated Halna. Similarly, TaRca1 enzyme showed positive correlation with the activity of RuBisCo. There is, however, need to manipulate the thermal stability of TaRca1 enzyme through protein engineering for sustaining the photosynthetic rate under HS-a novel approach toward development of "climate-smart" crop.
Collapse
Affiliation(s)
- Ranjeet R. Kumar
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Suneha Goswami
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Khushboo Singh
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Kavita Dubey
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Shweta Singh
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Renu Sharma
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Neeraj Verma
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| | - Yugal K. Kala
- Division of Genetics, Indian Agricultural Research InstituteNew Delhi, India
| | - Gyanendra K. Rai
- School of Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and TechnologyJammu, India
| | - Monendra Grover
- Centre for Agricultural Bioinformatics, Indian Council of Agricultural Research-Indian Agricultural Statistics Research InstituteNew Delhi, India
| | - Dwijesh C. Mishra
- Centre for Agricultural Bioinformatics, Indian Council of Agricultural Research-Indian Agricultural Statistics Research InstituteNew Delhi, India
| | - Bhupinder Singh
- Nuclear Research Laboratory, Plant Physiology, Indian Agricultural Research InstituteNew Delhi, India
| | - Himanshu Pathak
- Center for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research InstituteNew Delhi, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, Indian Council of Agricultural Research-Indian Agricultural Research InstituteNew Delhi, India
| | - Anil Rai
- Centre for Agricultural Bioinformatics, Indian Council of Agricultural Research-Indian Agricultural Statistics Research InstituteNew Delhi, India
| | - Shelly Praveen
- Division of Biochemistry, Indian Agricultural Research InstituteNew Delhi, India
| |
Collapse
|
12
|
Kumar RR, Goswami S, Sharma SK, Kala YK, Rai GK, Mishra DC, Grover M, Singh GP, Pathak H, Rai A, Chinnusamy V, Rai RD. Harnessing Next Generation Sequencing in Climate Change: RNA-Seq Analysis of Heat Stress-Responsive Genes in Wheat (Triticum aestivum L.). OMICS 2015; 19:632-47. [PMID: 26406536 DOI: 10.1089/omi.2015.0097] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Wheat is a staple food worldwide and provides 40% of the calories in the diet. Climate change and global warming pose a threat to wheat production, however, and demand a deeper understanding of how heat stress might impact wheat production and wheat biology. However, it is difficult to identify novel heat stress associated genes when the genomic information is not available. Wheat has a very large and complex genome that is about 37 times the size of the rice genome. The present study sequenced the whole transcriptome of the wheat cv. HD2329 at the flowering stage, under control (22°±3°C) and heat stress (42°C, 2 h) conditions using Illumina HiSeq and Roche GS-FLX 454 platforms. We assembled more than 26.3 and 25.6 million high-quality reads from the control and HS-treated tissues transcriptome sequences respectively. About 76,556 (control) and 54,033 (HS-treated) contigs were assembled and annotated de novo using different assemblers and a total of 21,529 unigenes were obtained. Gene expression profile showed significant differential expression of 1525 transcripts under heat stress, of which 27 transcripts showed very high (>10) fold upregulation. Cellular processes such as metabolic processes, protein phosphorylation, oxidations-reductions, among others were highly influenced by heat stress. In summary, these observations significantly enrich the transcript dataset of wheat available on public domain and show a de novo approach to discover the heat-responsive transcripts of wheat, which can accelerate the progress of wheat stress-genomics as well as the course of wheat breeding programs in the era of climate change.
Collapse
Affiliation(s)
- Ranjeet R Kumar
- 1 Division of Biochemistry, Indian Agricultural Research Institute , New Delhi, India
| | - Suneha Goswami
- 1 Division of Biochemistry, Indian Agricultural Research Institute , New Delhi, India
| | - Sushil K Sharma
- 1 Division of Biochemistry, Indian Agricultural Research Institute , New Delhi, India
| | - Yugal K Kala
- 2 Division of Genetics, Indian Agricultural Research Institute , New Delhi, India
| | - Gyanendra K Rai
- 3 Sher-e-Kashmir University of Agricultural Sciences and Technology , Jammu, India
| | - Dwijesh C Mishra
- 4 Centre for Agricultural Bio-Informatics (CAB-in), Indian Agricultural Statistics Research Institute (IASRI) , New Delhi, India
| | - Monendra Grover
- 4 Centre for Agricultural Bio-Informatics (CAB-in), Indian Agricultural Statistics Research Institute (IASRI) , New Delhi, India
| | | | - Himanshu Pathak
- 6 Division of CESCRA, Indian Agricultural Research Institute , New Delhi, India
| | - Anil Rai
- 4 Centre for Agricultural Bio-Informatics (CAB-in), Indian Agricultural Statistics Research Institute (IASRI) , New Delhi, India
| | - Viswanathan Chinnusamy
- 7 Division of Plant Physiology, Indian Agricultural Research Institute , New Delhi, India
| | - Raj D Rai
- 1 Division of Biochemistry, Indian Agricultural Research Institute , New Delhi, India
| |
Collapse
|
13
|
Kumar RR, Sharma SK, Rai GK, Singh K, Choudhury M, Singh GP, Goswami S, Pathak H, Rai RD. Exogenous application of putrescine at pre-anthesis enhances the thermotolerance of wheat (Triticum aestivum L.). Indian J Biochem Biophys 2014; 51:396-406. [PMID: 25630110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Antioxidant enzymes, besides being involved in various developmental processes, are known to be important for environmental stress tolerance in plants. In this study, the effect of treatment of 2.5 mM putrescine (Put), heat stress (HS -42 degrees C for 2 h) and their combination on the expression and activity of antioxidant enzymes was studied at pre-anthesis in the leaves of two wheat (Triticum aestivum L.) cultivars--HDR77 (thermotolerant) and HD2329 (thermosusceptible). We observed that 2.5 mM Put before HS significantly enhanced the transcript levels of superoxide dismutase (SOD), catalase (CAT), cytoplasmic and peroxisomal ascorbate peroxidase (cAPX, pAPX) in both the cultivars. However, the activities of antioxidant enzymes (SOD, CAT, APX and GR), as well as accumulation of antioxidants (ascorbic acid and total thiol content) were higher in HDR77 than in HD2329 in response to the treatment 2.5 mM Put + HS. No significant change was observed in the proline accumulation in response to HS and combined treatment of 2.5 mM Put + HS. A decrease in the H2O2 accumulation, lipid peroxidation and increase in cell membrane stability (CMS) were observed in response to 2.5 mM Put + HS treatment, as compared to HS treatment alone in both the cultivars; HDR77 was, however, more responsive to 2.5 mM Put + HS treatment. Put (2.5 mM) treatment at pre-anthesis thus modulated the defense mechanism responsible for the thermotolerance capacity of wheat under the heat stress. Elicitors like Put, therefore, need to be further studied for temporarily manipulating the thermotolerance capacity of wheat grown under the field conditions in view of the impending global climate change.
Collapse
|
14
|
Prajapati B, Rai GK, Rai SK, Upreti HC, Thapa M, Singh G, Shrestha RM. Prevalence of Salmonella typhi and paratyphi infection in children: a hospital based study. Nepal Med Coll J 2008; 10:238-241. [PMID: 19558061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The purpose of this study was to find out the prevalence and antibiotic sensitivity pattern of Salmonella typhi and paratyphi isolated from children presenting with fever at Kanti Children's Hospital in Kathmandu, Nepal. A total of 9,856 blood samples collected for culture during one year period (April 2007 to March 2008) were included in the study. Out of total, 235 (2.0%) were positive for S. typhi and paratyphi A. Of the total positive, 195 (83.0%) were S. typhi and 40 (17.0%) were S. paratyphi A. The growth positive rate in two genders (M: 53.2% and F: 46.8%) was not significant (P > 0.05). Over two-third of cases were clustered in the age-group of 1-10 years. The occurrence of infections was common in summer months (rainy season). S. typhi was found to be most sensitive to cefotaxime (100.0%) followed by ceftriaxone (98.9%), ofloxacin (93.5%), cotrimoxazole (93.5%) and chloramphenicol (93.2%) and was least sensitive to amoxyccilin (66.7%) followed by ciprofloxacin (86.6%). S. paratyphi also was found to be most sensitive to cefotaxime (100.0%), followed by ceftriaxone (97.4%), cotrimoxazole (97.1%) and chloramphenicol (92.5%) and was least sensitive to amoxycillin (15.0%) followed by ciprofloxacin (51.3%) and ofloxacin (70.3%).
Collapse
Affiliation(s)
- B Prajapati
- Department of Pediatric Medicine, Kanti Children's Hospital, Kathmandu, Nepal.
| | | | | | | | | | | | | |
Collapse
|
15
|
Rai GK, Upreti HC, Rai SK, Shah KP, Shrestha RM. Causative agents of urinary tract infections in children and their antibiotic sensitivity pattern: a hospital based study. Nepal Med Coll J 2008; 10:86-90. [PMID: 18828428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A retrospective study was conducted to find out the causative agents of urinary tract infection (UTI) in children and their antibiotic sensitivity pattern among Nepalese children. This was done at Kanti Children's Hospital in Kathmandu (Nepal) by analyzing the records of urine samples collected for culture and sensitivity tests over a period of six months (April to November, 2007). Of the total 1878 mid-stream urine samples collected from suspected cases of UTI, 538 (28.6%) were positive for pathogenic organisms. There was no significant difference in growth positive rate in two genders (M: 51.7% and F: 48.3%). Of the various pathogenic organisms isolated, Escherichia coli constituted for 93.3% followed by Proteus sp, Klebsiella sp, Citrobacter sp, Staphylococcus aureus and others. E. coli was found to be most sensitive to amikacin, chloramphenicol, nitrofurantoin and ofloxacin and least sensitive to most commonly used drugs like cephalexin, nalidixic acid, cotrimoxazole and norfloxacin.
Collapse
Affiliation(s)
- G K Rai
- Department of Pediatric Medicine, Kanti Children's Hospital, Kathmandu, Nepal.
| | | | | | | | | |
Collapse
|
16
|
Abstract
Introduction: Neonatal sepsis is a major cause of mortality and morbidity in newborn. There are many factors that contribute to neonatal sepsis. The organisms responsible for early onset and late onset sepsis are different. Objective: This study was conducted to analyze the organisms responsible for early onset and late onset neonatal sepsis. Materials and Methods: A prospective hospital based study over the period of one year was conducted at neonatal intermediate care unit of Kanti Children's Hospital, Maharajgunj, Kathmandu, Nepal. Results: Organisms were isolated in 6.1% of the collected blood samples. The male female ratio of culture proven sepsis was 1.9:1. Escherichia coli were found to be the most common organism in both early onset and late onset sepsis. Staphylococcus aureus was more common in late onset sepsis than early onset sepsis.Conclusion: Escherichia coli were the most common organism in both early onset and late onset sepsis. Staphylococcal aureus was significantly more common in late onset sepsis than early onset sepsis. Key words: Bacteriological profile; early onset sepsis; late onset sepsis; neonate DOI: 10.3126/jnps.v31i1.4158J Nep Paedtr Soc 2010;31(1):1-5
Collapse
|