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Articles by D.R. Thakur
Total Records ( 10 ) for D.R. Thakur
  Saruchi Sharma and D.R. Thakur
  Legume seeds are rich and varied source of secondary plant metabolites which are toxic or anti metabolic towards insect pests, possibly by virtue of these toxic substances they show resistance and susceptibility against stored grain pest species. Despite the potential nutritional and health promoting value the presence of antinutritional factors limit biological value and usage of legumes as food. Antinutritional factors interfere with digestion and also make the seeds unpalatable when consumed in raw form. Based on these possibilities the biochemical basis of bruchid resistance has been studied in different legume genotypes and the results recorded revealed that highly resistant soybean genotypes possesed high amount of fats, proteins and antinutritional factors (phenols and 4-5 times more trypsin inhibitors) than cowpea and chickpea (kabuli>desi) genotypes which contain high amount of carbohydrates and low amount of antinutritional factors and were susceptible towards Callosobruchus species.
  Renuka and D.R. Thakur
  A study has been conducted to evaluate the total flavonoids and phenolics contents of ten genotypes of Phaseolus vulgaris Linnaeus seeds as these compounds are natural antioxidants, disease preventing, anti-ageing and health promoting. All genotypes were distinct in shape, size and colour and their total flavonoids and phenolics contents also varied significantly. Genotype Triloki (K-198) contained the highest (1.67±0.00 quercetin equivalents) and Him-1 contained the lowest (0.29±0.01 mg g-1 quercetin equivalents) amount of total flavonoids. In case of total phenolics, genotype Him-1 had the highest (2.48±0.02 mg g-1 gallic acid equivalents) and PLB 14-1 had the lowest (0.66±0.02 mg g-1 gallic acid equivalents) amount of total phenolics contents. Analysis of variance (ANOVA) and Duncan’s Multiple Range Test (DMRT) also indicated the significant differences between total flavonoids and phenolics contents of all genotypes. The study therefore, revealed that consumption of a particular genotype of P. vulgaris seeds can promote the health and demote the ageing by its disease preventing potential of some natural antioxidants compounds present in cotyledons.
  Jaswant Singh , M.L. Thakur , D.R. Thakur and H.S. Banyal
  Thirteen species of mammals belonging to 13 genera, 12 families and 6 orders have been recorded from Prashar and surrounding area. Five species belonged to order Carnivora followed by Primates, Artiodactyla and Rodentia (2 species each), Insectivora and Chiroptera (one species each). Families Cercopithecidae and Mustellidae supported a maximum of two species each and other namely Soricidae, Vespertilionidae, Canidae, Ursidae, Felidae, Cervidae, Bovidae, Scuiridae and Muridae were represented by one species each. It has been reported that 11 of the 13 species have been placed under different schedules of the Wildlife (Protection) Act, 1972. Of these, one species namely Panthera pardus has been placed under Schedule-I of the WLP Act. Semnopithecus ajax has been categorised as endangered, Ursus thibetanus placed under vulnerable categoryand Panthera pardus and Naemorhedus goral declared as near threatened by IUCN.
  Ranjit Singh Rana , D.R. Thakur , H.S. Banyal and Asheesh Mehta
  The explorations of avifauna of Chandertal wetland sanctuary revealed the presence of 41 birds species belonging to 35 genera, 12 families, 7 orders of class Aves. Family Passeridae represented by 6 species, Fringilidae by 5 species and Corvidae, Phasianidae and Accipitridae has 4 species each. Family Columbidae has 3 species but families like Musciapidae, Falconidae, Scolopacidae, Charadriidae, Upupidae and Anatidae each represented by single species. There are 20 avian species found in sanctuary which are listed in Schedule IV of the Wildlife Protection Act, 1972.
  Saruchi Sharma and D.R. Thakur
  A comparative study on the varietal preference and developmental behaviour of C. maculatus on thirteen different soybean varieties has been done and results revealed that all the genotypes were highly preferred by C. maculatus for egg laying except harasoya which was with intermediate surface texture. On the basis of developmental behaviour among all the genotypes, bragg was totally resistant, Pb-1, shivalik, JS-9305, JS-9560 and harasoya were found relatively resistant while other varieties, JS-335, Him soya, P9-2-2, P2-2, Pk-472, P13-4 and Palam soya were found susceptible to C. maculatus.
  Ranjit Singh , D.R. Thakur and Asheesh Mehta
  Birds belonging to Passeriformes are commonly known passerines and constitute the most rich and diverse group among the avian orders. Studies on avian fauna of Chandertal wildlife sanctuary and wetland in greater Himalayan range of Himachal Pradesh, unveiled four passerines species belong to four different families. The studied area (wetland) is internationally known Ramsar Site (No. 1569) due to its characteristic and a few endangered flora and fauna. The lake with 2.5 km circumference and few small semi-permanent water bodies interspersed with grassy meadows and rocky pastures, hosts different alpine chordates and non-chordate fauna. Erymophila alpestris (L., 1758), Pyrrhocorax graculus (L., 1758), Phoenicurus ochruros (Gmelin, 1774) and Motacilla citreola Pallas, 1774 have been recorded in small flocks along with their juveniles and immature during summer season of each consecutive for six years (2008-2012 and 2014).
  Saruchi Sharma and D.R. Thakur
  Seeds of all legumes are vulnerable to be attacked by seed beetles, both in field and storage. The resistant/tolerant genotypes certainly be helpful to reduce storage losses by bruchids and other insect pests and can be exploited by the breeders for the evolution of new varieties. This vital information of varietal resistance among different genotypes of cowpea, chickpea and soybean will assist in devising the control procedures against these legendary pest species. The expansion of insect resistance and high yielding varieties having moderate to high levels of resistance is a promising approach for exploration of integrated pest management strategy. By keeping in view a comparative growth performance of C. maculatus on genotypes of different legumes has been studied. And the results revealed that all the legume genotypes of soybean (except harasoya) and cowpea with smooth seed coat texture were highly preferred by C. maculatus for egg laying than chickpea genotypes (kabuli>desi). Among all the genotypes of three legumes highest percentage of adult emergence, growth index, percentage reduction in weight and low developmental period was recorded in cowpea followed by chickpea (kabuli>desi) and least in soybean which may be due to physical and chemical factors which resist the growth and development of C. maculatus on soybean genotypes.
  D.R. Thakur and Asheesh Mehta
  Anas querquedula (Linnaeus, 1758) commonly known as garganey, has been reported for the first time from the Chandertal wetland, an internationally known Ramsar Site and from the wet meadows in the vicinity of Spiti river in Lossar village of Spiti Valley, Himachal Pradesh, India. Garganey has been reported in Himachal Pradesh from Pong Dam wetland (also a Ramsar Site) in Kangra District at an altitude of 390–423 meter above mean sea level. There it has been reported as a late visitor who arrives in the months of August and September every year. It is a new record of this bird from Chandertal wetland and from the Lossar area of Spiti river located on the Eastern side of famous Kunzum Pass.
  D.R. Thakur and Kalpna
  Many insect pests have crossed over the geographical boundaries and became cosmopolitan in distribution through anthropogenic migration and import and export of the comestible consignments. Acanthoscelides macrophthalmus (Schaeffer) (Coleoptera: Chrysomelidae: Bruchidae) a recently reported well known pest of Leucaena leucocephala (Lamark) de Wit (Fabaceae) from Indian subcontinent has been studied for life history traits under laboratory conditions. Acanthoscelides macrophthalmus utilizes aphagously developing and developed seeds for oviposition and larval development. Eggs were laid either on the pod surface, over a seed, or directly on exposed seeds. Female laid an average of 38.3±8.01 eggs and produced 27.4±6.77 offsprings. Larvae grew and molted inside the host seed and adult bruchid emerged out after cutting a circular window in testa of the seed and pod as the case may be. Total development was completed in 41.6±7.18 days and newly emerged insects became sexually mature after one hour of emergence. All the four larval instars were studied Scanning Electron Microscopically (SEM) and head, antenna, clypeolabial complex, leg etc., were described separately and taxonomically important structure like setae, sensillae trichodea, microtrichia etc., beared by integumentry system were projected accordingly.
  Anupam Sharma , V.K. Chandla and D.R. Thakur
  In the present study, the occurrence and diversity of fungi associated with beetles and white grub, Brahmina coriacea (Hope) (Coleoptera: Scarabaeidae) in potato fields of North Western Indian hills was explored for the first time. Sixteen species belonging to 9 genera and two non-sporulating fungi were isolated and identified from white grub cadavers, adult beetles and soil samples in question. Total 1404 out of 14164 (9.91%) beetles were found infected with fungi during year 2007-09 at studied areas. Most abundantly occurring fungi associated with beetles were Metarhizium anisopliae, 423 out of 1404 (30.12%); followed by Aspergillus flavus, 322 (23.0%); Fusarium oxysporum, 262 (18.66%); Beauveria bassiana, 143 (10.2%); Aspergillus clavatus, 130 (9.25%) and Fusarium solani, 120 (8.6%). Whereas, 21 out of 1351 (1.6%) white grubs were found infected with fungi. A. clavatus showed high frequency of infection to grubs (33.8%), followed by A. flavus, (23.8%) and Rhizopus oryzae, (19.04%). Each Aspergillus niger and Alternaria alternata showed an infection frequency of 9.53% while 4.8% was noticed for Penicillium griseofulvum. Total ten fungi were identified from soil samples with high frequency of R. oryzae (27.60%) and Cunninghamella elegans (24.13%). Preliminary pathogenicity tests were performed on late first instar grubs for all isolated fungi except non-sporulating. B. bassiana was found highly pathogenic with 63.70% mortalities followed by 60.37% by A. flavus and 50.00% by M. anisopliae after 15 days of treatment. F. oxysporum and F. solani showed mortalities up to 49.63 and 42.59%, respectively.
 
 
 
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