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Articles by G.P. Singh
Total Records ( 6 ) for G.P. Singh
  G.P. Singh and H.B. Chaudhary
  A study was conducted to work out the phenotypic and genotypic variance, heritability, genetic advance, correlation coefficients and path analysis for yield and yield contributing traits. Harvest index and biological yield per meter had direct positive effect both at genotypic and phenotypic level across the entire environment. Higher heritability was observed for plant height and its components. However, the heritability was in general found to lower under moisture stress conditions. Plant height, peduncle length and seedling dry weight showed positive correlation with grain yield at genotypic level. Hence these traits should be given emphasis while selecting high yielding wheat genotypes under moisture stress conditions.
  K.N. Madhusudhan , G. Vinayarani , S.A. Deepak , S.R. Niranjana , H.S. Prakash , G.P. Singh , A.K. Sinha and B.C. Prasad
  The present study was aimed to investigate the effect of inducers viz., plant extracts, plant seed oils and salicylic acid on tobamoviruses in both indicator and host plant. Tobamoviruses are major hurdles in the production of tomato and bell pepper. Currently, different inducers derived from various origins are being used to reduce the virus concentration. Preliminary screening of the inducers against tobamoviruses was conducted by using the local lesion assay (Nicotiana glutinosa). The results showed that all the inducers used for screening were effective in reducing the number of local lesions formed by the challenge inoculation of tobamoviruses. Both spray and seed treatment of inducers against the tobamoviruses reduced the concentration of viruses in the seedlings as evident from the results of Indirect Enzyme linked immunosorbent assay. Among the inducers used for the induction of resistance against tobamoviruses, Bougainvillea spectabilis extract was found to be most effective. The inducer-treated seeds also showed enhancement of seed germination and seedling vigor.
  Sunil Kr Pandey , G.P. Singh and Dr. Vineet Kansal
  Problem statement: Object and component technologies, rapidly maturing branches of information technology, have been becoming pervasive elements of systems development, especially the recently popular Internet applications and thus leading to increased complexity and at the same time broader range of applications. Approach: This needs to be understood in order to maximize its benefits and applications with consistent results. However, mainstream Object Oriented Systems Development (OOSD), consisting of Object Oriented Analysis and Design (OOAD) and Object-Oriented Programming (OOP), has a history of difficulties and is still struggling to gain prevalent acceptance. Results: There have been number of studies and experiments conducted by experts and researchers in the past which provides a solid base to take up this study and look into various intricacies present. There have been several studies and focused efforts in this direction which laid down the basis for a segment of people to form the opinion as “technology adoption is mostly the result of marketing forces, not scientific evidence” whereas there have been another segment that believes that object technology is “still long on hype and short on results …”. The gurus of OOSD continue to tout its vast superiority over conventional systems development, even to the extent of developing a unified software development process. Conclusion: The advocates of OOSD claim many advantages including easier modeling, increased code reuse, higher system quality and easier maintenance. It is well understood that analysis and design are extremely critical aspects of successful systems development especially in the case of OOSD. As the development of any successful information system must begin with a well-conceived and implemented analysis and design, this study will focus on the most recent empirical evidence on the pros and cons of OOAD.
  K.P. Kiran Kumar , G.P. Singh , A.K. Sinha , K.N. Madhusudhan and B.C. Prasad
  Among the diseases of tasar silkworm, virosis caused by Cytoplasmic Polyhedrosis Virus (CPV) is highly contagious and more prevalent. Thirteen antiviral plants were used to test their efficacy against Antherae mylitta cytoplasmic polyhedrosis virus (AmCPV) in tasar silkworm. The aqueous extracts of these plants in different concentrations were used for containment of virosis in virus-infected silkworm and mortality was recorded. The influence of best three phytoextracts which have shown good results in suppressing virosis were subjected for the study of cellular and biochemical changes. Two percent aqueous extracts of Aloe barbedensis (AKP 3), P. corylifolia (AKP13) and Bougainvillea spectabilis (AKP 9) were found more effective in suppressing the virosis and reduced the mortality due to virus infection of 66.17, 64.47 and 57.19%, respectively. The total hemocyte count increased up to 6th day of post inoculation in phytoextract treated batches while in the inoculated control the increase was within 3 days indicating the positive hemocyte mediated response in silkworm treated with phytoextract. The hemolymph protein in Aloe barbedensis treated silkworm (35.27 mg mL-1) was significantly higher than inoculated control (20.25 mg mL-1). The gradual increase of total hemolymph proteins from 1st day (16.31 mg mL-1) to 8th day (33.73 mg mL-1) was observed in healthy control where as in inoculated control increasing trend was observed from day 1 (16.26 mg mL-1) to day 3 (24.22 mg mL-1) there after decreasing trend was observed and finally reached to 20.25 mg mL-1 (8th day). The plant extract of Aloe barbedensis (AKP 3) is more effective in suppressing virosis based on the results of mortality reduction against virosis cellular and biochemical changes.
  K.P. Kiran Kumar , A.K. Sinha , G.P. Singh and K.N. Madhusudhan
  Penicillium citrinum causes white muscardine in tasar silkworm and significantly damage cocoon production at farmer’s field. Four systemic fungicides Bavistin, a carbandazim fungicide (AK 1), Bayleton, a triazole compound (AK 2), Dithane M-45, a mancozeb fungicide (AK 3) and Thiram, a dimethyl dithiocarbamate (AK 4) were tested for efficacy to control white muscardine in, Antheraea mylitta D. One and two percent of AK 1 and AK 3, 0.15 to 2% of AK 2 and 2% of AK 4 in aqueous solution were found to be effective in in vitro condition for the control of muscardine. These fungicides on feeding through the T. arjuna leaves continuously for two days in 5th instar larvae inoculated topically with conidia of Penicillium citrinum (4x106 conidia mL-1) resulted in reduction in mortality due to muscardine by 49-94% as against 100% mortality in inoculated control (control 6). AK 1 reduced the mortality by 93 and 94% in the final instar silkworm at 1 and 2%, respectively. AK 2 at 0.05 and 0.1% concentration reduced the mortality by 85 and 87%, respectively. In case of AK 3 and AK 4 at 1% concentration reduced the mortality by 88 and 69%, whereas at 2% reduced mortality by 90 and 75%, respectively. No mortality was noticed in the controls 1 to 4 which indicated the non toxicity at the particular concentrations. Bavistin (AK 1) and Dithane M-45 (AKP 3) at 1 and 2% concentrations were more effective among tested systemic fungicides in suppressing muscardine in tasar silkworm.
  G.P. Singh , A.K. Sinha , P.K. Kumar and B.C. Prasad
  Tropical tasar silkworm, Antheraea mylitta D., an economically important insect is affected by bacteriosis caused by bacteria, which accounts considerable loss of 10-15% to silk cocoon production. The aim of the present investigation was to isolation, characterization and identification of bacteria causing diseases in Indian tropical tasar silkworm, Antheraea mylitta D. Total 15 isolates of bacteria in two groups (8 from anal lip sealing diseased silkworms and 7 from rectal protrusion diseased worms) were isolated. The shape, size and colour of bacterial colony were recorded. The gram reaction of vegetative cells, its shape, size and pattern of reaction with different enzymes were observed for characterization of different bacterial isolates. Pathogenecity of these bacteria have shown that only two bacterial isolates coded SA3 and RP2 were responsible for anal lip sealing and rectal protrusion diseases, respectively in tasar silkworm. The bacterial isolates coded SA3 and RP2 on the basis of cultural, morphological and biochemical characters tentatively identified as Serratia sp. which were, close to Serratia nematodiphila and Serratia marcescens sub sp., respectively. The infection of anal lip sealing and rectal protrusion diseases in Indian tropical tasar silkworm caused by Serratia nematodiphila and Serratia marcescens was reported first time.
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