Browsing by Author "Soumit Kumar Behera"

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GABA accretion reduces Lsi-1 and Lsi-2 gene expressions and modulates physiological responses in Oryza sativa to provide tolerance towards arsenic
(Nature Publishing Group, 2017) Navin Kumar; Arvind Kumar Dubey; Atul Kumar Upadhyay; Ambedkar Gautam; Ruma Ranjan; Saripella Srikishna; Nayan Sahu; Soumit Kumar Behera; Shekhar Mallick
GABA counteracts wide range of stresses through regulation of GABA shunt pathway in plants. Although, GABA assisted tolerance against As toxicity in plants is still unexplored. We have examined GABA induced tolerance in rice seedlings with two exposure periods of GABA i.e., short term and long term. Results showed that accumulation of GABA reduced the expressions of Lsi-1 and Lsi-2 transporter genes, which ultimately decreased the accumulation of As in rice seedlings. The accumulation of GABA also modulated the gene expression of GABA shunt pathway and activity of antioxidant enzymes, which strongly induced the tolerance in plants. Antioxidant enzymes such as CAT, POD, GPX and SOD showed maximum alteration in activity with GABA accretion. In both exposure periods, long term accumulation of GABA was highly efficient to provide tolerance to plants against As(III), while higher level of GABA at short term was toxic. Tolerance responses of GABA towards As(III) was reflected by minimal changes in various physiological (WUE, A, gs, PhiPS2, qp, NPQ, ETR and Trmmol) and growth parameters with concomitant accumulation. Oxidative stress marker such as TBARS and H2O2 contents were reduced with GABA accumulation. These results suggested that GABA sturdily inhibits As accumulation and provides tolerance towards As(III). © 2017 The Author(s).
New vegetation type map of India prepared using satellite remote sensing: Comparison with global vegetation maps and utilities
(Elsevier B.V., 2015) P.S. Roy; M.D. Behera; M.S.R. Murthy; Arijit Roy; Sarnam Singh; S.P.S. Kushwaha; C.S. Jha; S. Sudhakar; P.K. Joshi; Ch. Sudhakar Reddy; Stutee Gupta; Girish Pujar; C.B.S. Dutt; V.K. Srivastava; M.C. Porwal; Poonam Tripathi; J.S. Singh; Vishwas Chitale; A.K. Skidmore; G. Rajshekhar; Deepak Kushwaha; Harish Karnatak; Sameer Saran; A. Giriraj; Hitendra Padalia; Manish Kale; Subrato Nandy; C. Jeganathan; C.P. Singh; C.M. Biradar; Chiranjibi Pattanaik; D.K. Singh; G.M. Devagiri; Gautam Talukdar; Rabindra K. Panigrahy; Harnam Singh; J.R. Sharma; K. Haridasan; Shivam Trivedi; K.P. Singh; L. Kannan; M. Daniel; M.K. Misra; Madhura Niphadkar; Nidhi Nagabhatla; Nupoor Prasad; O.P. Tripathi; P. Rama Chandra Prasad; Pushpa Dash; Qamer Qureshi; S.K. Tripathi; B.R. Ramesh; Balakrishnan Gowda; Sanjay Tomar; Shakil Romshoo; Shilpa Giriraj; Shirish A. Ravan; Soumit Kumar Behera; Subrato Paul; Ashesh Kumar Das; B.K. Ranganath; T.P. Singh; T.R. Sahu; Uma Shankar; A.R.R. Menon; Gaurav Srivastava; Neeti; Subrat Sharma; U.B. Mohapatra; Ashok Peddi; Humayun Rashid; Irfan Salroo; P. Hari Krishna; P.K. Hajra; A.O. Vergheese; Shafique Matin; Swapnil A. Chaudhary; Sonali Ghosh; Udaya Lakshmi; Deepshikha Rawat; Kalpana Ambastha; Akhtar H. Malik; B.S.S. Devi; K.C. Sharma; Prashant Mukharjee; Ajay Sharma; Priya Davidar; R.R. Venkata Raju; S.S. Katewa; Shashi Kant; Vatsavaya S. Raju; B.P. Uniyal; Bijan Debnath; D.K. Rout; Rajesh Thapa; Shijo Joseph; Pradeep Chhetri; Reshma M. Ramachandran
A seamless vegetation type map of India (scale 1: 50,000) prepared using medium-resolution IRS LISS-III images is presented. The map was created using an on-screen visual interpretation technique and has an accuracy of 90%, as assessed using 15,565 ground control points. India has hitherto been using potential vegetation/forest type map prepared by Champion and Seth in 1968. We characterized and mapped further the vegetation type distribution in the country in terms of occurrence and distribution, area occupancy, percentage of protected area (PA) covered by each vegetation type, range of elevation, mean annual temperature and precipitation over the past 100 years. A remote sensing-amenable hierarchical classification scheme that accommodates natural and semi-natural systems was conceptualized, and the natural vegetation was classified into forests, scrub/shrub lands and grasslands on the basis of extent of vegetation cover. We discuss the distribution and potential utility of the vegetation type map in a broad range of ecological, climatic and conservation applications from global, national and local perspectives. Weused 15,565 ground control points to assess the accuracy of products available globally (i.e., GlobCover, Holdridge's life zone map and potential natural vegetation (PNV) maps). Hence we recommend that the map prepared herein be used widely. This vegetation type map is the most comprehensive one developed for India so far. It was prepared using 23.5m seasonal satellite remote sensing data, field samples and information relating to the biogeography, climate and soil. The digital map is now available through a web portal (http://bis.iirs.gov.in). © 2015 Elsevier B.V.
Shifting cultivation induced burn area dynamics using ensemble approach in Northeast India
(Elsevier B.V., 2022) Pulakesh Das; Mukunda Dev Behera; Saroj Kanta Barik; Sujoy Mudi; Buddolla Jagadish; Swarup Sarkar; Santa Ram Joshi; Dibyendu Adhikari; Soumit Kumar Behera; Kiranmay Sarma; Prashant Kumar Srivastava; Puneet Singh Chauhan
Identifying shifting cultivation areas and assessing their spatio-temporal dynamics are essential in framing climate-adaptive policies for efficient forest management and agriculture practices for the benefit of people. The current study attempts to develop an alternative approach to classify the shifting cultivation areas using an ensemble technique, integrating multiple spectral indices in three states of northeast India (NEI), such as Assam, Manipur, and Meghalaya. The adopted approach integrates green cover and leaf water content changes during shifting cultivation land preparation in Landsat imagery. The deforested burned area patches were identified based on threshold values using Landsat data-derived indices on vegetation, burned area and leaf water, and digital elevation model (DEM). The ensemble approach provided shifting cultivation maps with good overall accuracy (> 83%). The maximum shifting cultivation area was observed in Assam (126.87 km2), followed by Meghalaya (51.53 km2) and Manipur (46.04 km2) in 2016. The normalized difference vegetation index (NDVI) and NDVI difference performed better than other vegetation indices. The ensemble approach can be applied in other regions with minor modifications in threshold values, thus having the potential for accounting to shifting cultivation dynamics on an operational basis. Future research may include blending local traditional knowledge and modern scientific solutions for improved forest and land resources planning for the benefit of inhabitants and the mountain environment under the climate change scenarios. © 2021
Sucrose plays key role in amelioration of arsenic induced phytotoxicity through modulating phosphate and silicon transporters, physiological and biochemical responses in C3 (Oryza sativa L.) and C4 (Zea mays L.)
(Elsevier B.V., 2020) Ambedkar Gautam; Navin Kumar; Arvind Kumar Dubey; Ruma Ranjan; Nayan Sahu; Soumit Kumar Behera; Kavita Shah; Rudra Deo Tripathi; Shekhar Mallick
Sucrose is a precursor for several vital biomolecules and essential for growth of the plant. The present study investigated the interrelationship between sucrose (25 μM) and PO4 (iP) in amelioration of arsenic (iAs) [60 μM of AsIII and AsV] toxicity in C3 (Oryza sativa) and C4 (Zea mays) plants. Application of sucrose recovered the iAs induced phytotoxicity, morphological and physiological parameters in both C3 and C4 plant seedlings. Alternatively, iAs accumulation enhanced the endogenous level of sucrose in the seedlings. Also, sucrose suppressed the gene expression of low silicon transporters in both C3 and C4 plants, resulting in lower iAs uptake. Presence of iP, suppressed expression of root iP transporters which coincided with reduced iAs accumulation in maize root (23 %) over its AsIII, and that in shoots of both of C3 (12 %) and C4 (35 %) seedlings over AsV. However, the iP transporters in rice [OsPT-1, 6 & 9] and in maize (ZmPHT1;6, ZmPHT2;1, ZmPHT1;1), shoot and root, respectively, were upregulated with sucrose application, enhancing the iP accumulation. Sucrose application reduced the level of H2O2 and TBARS in both plants, while enhanced the thiolic compounds (GSH, cysteine and NPSH) and activities of antioxidant enzymes (APX, GPX and SOD) against iAs toxicity under both available and iP deprived conditions. The physiological parameters such as A, PhiPS2, gs and qP recovered whereas, NPQ was reduced with sucrose application, towards iAs treatments in both the seedlings. Overall, the results indicate that sucrose plays a vital role in the amelioration of iAs induced toxicity through modulation of iP and low silicon transporters, resulting in reducing the iAs accumulation, physiological parameters and antioxidants. © 2019 Elsevier B.V.