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Home > Genetic Behavior of Morpho-Physiological Traits in Different Generations of Wheat under Normal and Water Deficit Environments

Genetic Behavior of Morpho-Physiological Traits in Different Generations of Wheat under Normal and Water Deficit Environments

Thesis Info

Access Option

External Link

Author

Saleem, Salman

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2015

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/7021/1/PHD%20Thesis%20Salman%20Saleem%202008-ag-691_UAF_2015_PlantBreeding_Genetics.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726284696

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The present study was designed by keeping in view the future scenario of increasing demand of wheat and decreasing resources especially irrigation water which is the most important of all the inputs. Hundred wheat accession were screened for relative water content and relative water loss of excised leaf. Based on the screening results two crosses and their generations P1, P2, F1, F2, BC1 and BC2 were developed among the contrasting parents for each of these traits. Further research was carried out to un-reveal the gene action of various yield and drought related traits using six wheat generations in field conditions under normal irrigation and water stress conditions. The relative water loss of excised leaf appeared as a better screening parameter for drought tolerance because the generations developed on the basis of this parameter performed better under drought for almost all the morpho-physiological traits. Conventional biometrical breeding methods were used to un-reveal the inheritance of chlorophyll ‘a’, chlorophyll ‘b’, leaf carotenoids, leaf water potential, leaf osmotic potential, leaf turgor potential at vegetative stage and plant height, number of tillers, flag leaf area, flag leaf weight, number of spikelets per spike, grain weight per spike, grain filling period, canopy temperature and grain yield per plant at maturity. Almost all the traits showed additive and non-additive (epistatic and dominant) nature of gene control except canopy temperature, leaf weight and turgor potential which were controlled by simple additive gene action which was further supported by high heritability. Overall less epistatic effects were observed in physiological traits as compared to yield and yield component traits which indicated that these traits can be manipulated comparatively easily for tailoring drought tolerant cultivars, the correlation results also supported these findings by showing their positive association with grain yield. The accession 8126 is suggested to be used in wheat breeding program to tailor drought resistance in the crop.
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موضوع 10:اردو تنقیدکا ارتقا
تنقید کے پس منظرکاپہلانظریہ :
بعض لوگوں کے مطابق اردو تنقید کا آغاز تذکروں سے ہوتا ہے۔ اس سلسلے میں فارسی زبان میں۱۷۶۷ء یں فارسی زبان میں چھپنے والے میر تقی میر کے تذکرے "نکات الشعراء " کو سب سے پہلا تذکرہ تسلیم کیا جاتا ہے۔ اس میں اردو شاعروں کے حوالے سے لکھا گیا تھا۔اردو زبان میں پہلا تذکرہ ۱۸۰۸ء میں 'مرزا علی لطف 'نے" گلشن ہند "کے نام سے لکھا۔
تنقید کے پس منظرکادوسرانظریہ :
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Chronic Hepatitis C: Genotypes in Relation to Grading and Staging, Risk Factors and Response to Therapy

HCV infection is a worldwide common health problem having a high affinity for long persistent infections which may develop to considerable changes in liver like hepatocellular carcinoma, cirrhosis and chronic hepatitis. HCV is inherently unstable, giving rise to multiple genotypes and more than 50 subtypes. Mutations that occur during viral replications result in its substantial heterogeneity and overtime in one entity multiple dozen mutant strains may be found. Due to geographical distribution of several different genotypes of Hepatitis C Virus in the world, many of them giving out multiple routes of infection. Constant response to treatment of HCV genotype is a burly forecaster. Assessment of rating and phase is used in evaluating histological outcome in clinical trials or as variables in statistical analyses of progression or therapeutic response. Beginning of amalgamation treatment with ribavirin and interferon has deliberately enhanced clinical result. 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ELISA for the presence of HCV antibodies was performed and positive patients were submitted to a laboratorial protocol. The clinical and epidemiological data were recorded on a proforma and various biochemical tests were performed. HCV RNA was detected by RT PCR (Quantitative and Qualitative methods), the first viral load was low in 295 (85.96%) cases, medium in 29 (8.43%) cases, high in 15 (4.36%) and very high in 5 (1.45%) cases. The genotying was performed and the results of genotyping revealed that HCV 3a was the major genotype in 242(70.34%) cases, followed by genotype 3b in 19(5.52%) cases, genotype 1a in 10(2.61%) cases, genotype 1b in 5(1.45%) cases, genotype 2 in 4(1.16%) cases, genotype 5 in 3(0.87%) cases and mixed genotype in 9(2.61%) cases. However no other genotype could be identified in 52(15.11%) cases and hence were considered as “untypable”. 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Out of 276 cases of positive response with combined antiviral therapy, 272 (98.55%) cases showed low level of initial viral load, while out of 68 unresponsive 48 (66.1%) showed medium, high and very high level initial viral load. The current study verifies the results of various international researches; this is the first ever study conducted which covers the data of the whole interior Sindh. The information gained out of the current study will help improving our understanding of HCV which will be beneficial for clinicians in treating these patients with precise therapy. Furthermore, investigating the association of genotype with histological staging and grading, threat and response to treatment will also show its impact on progression of persistent hepatitis C and curing stratigies. Key Words: HCV RNA, Chronic hepatitis, Genotyping, Transmission, Histological staging and grading, Treatment response.