Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Genotypic variation"”.
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Genotypic variation in Actinidia deliciosa fruit size and carbohydrate content
… was strongly source limited, whereas in genotype variation it was not. Moreover, CPPU-treated fruit gene expression (at sucrose cleavage and AGPase levels) was similar to that in high dry matter genotypes. It was therefore concluded that CPPU promotes both sink size and sink activity, but at …
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Genotypic variation in water use efficiency, gaseous exchange and yield of four cassava landraces grown under rainfed conditions in South Africa
… using the water balance approach. There was no variation in the root yield and yield components amongst the landraces in 2017/2018 cropping season but, genotypes affected aboveground biomass, root girth, number of roots per plant and root yield in 2016/2017 cropping season. There was a …
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Assessing Multivariate Heritability through Nonparametric Methods
… quantified by heritability. By distinguishing genotypic variation, or variation due to parental pairings, from phenotypic variation, or normal intraspecies variation, the heritability of traits can be estimated. Due to the multivariate nature of many traits, such as size and shape, computation …
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Identification and Characterization of Physiological Traits Related to Productivity of Maize (Multiple Regression, Leaf Senescence, Inheritance, Green Score)
… Our objectives were to: (a) evaluate genotypic variation and the relationship of a large array of physiological traits to maize (Zea mays L.) grain yield and stalk lodging in a group of 76 hybrids; (b) utilize multiple regression techniques to identify and characterize the combination …
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Assessment of plant hormone quantification as a new physiological trait for crop breeding using a new classification method for crop performance under drought
… Due to the complexity of spatial and temporal variation of hormone accumulation (ABA and ethylene) and their different effects in plant development in response to stress environments, it is necessary to investigate how factors other than environment can influence the production of hormones. The …
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The Influence of HIV-1 Subtype C LTR Genotype on Latency Potential
… remission in infected individuals. Subtype level genotypic variation within regulatory elements of the HIV-1 promoter, the long terminal repeat (LTR), has been shown to influence latency establishment in in vitro models. We investigated the influence of inter-participant subtype C LTR genotypic …
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Genotypic and Phenotypic Variation of the Florida Scrub Lizard (Sceloporus Woodi)
In my 1st chapter I investigate the phenotypic variation of the Florida scrub lizard by examining sprinting and jumping ability. These are key performance measures that have been widely studied in vertebrates. The vast majority of these studies, however, use methodologies that lack ecological …
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Induced defenses in apple fruits: linking fruit chemistry, quality, and plant-insect-microbe interactions
… and subject to temporal, environmental, or genotypic variation. Overall, these chapters examined the relationship between biotic interactions and induced fruit chemistry, with the goal of improving understanding of plant-microbe-insect interactions and incorporating these interactions into …
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Basidiospore infection of Austropuccinia psidii and resistance ofopen-pollinated Eucalyptus globulus families to rust and Teratosphaeria Leaf Disease
… be conclusively identified as the source of the genotypic variation observed between these populations through inoculation tests with basidiospores of A. psidii race 1 (biotype Brazilian) in Eucalyptus. A single multilocus genotype (MLG) of T. nubilosa predominates in Brazil and Spain - an …
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Algorithms for discovering disease genes by integrating 'omics data
… the subset of SNPs that best describes the genotypic variation in the patient population. Subsequently, we focus on the problem of disease gene prioritization. We propose a novel algorithm, VAVIEN, that utilizes the topological similarity of proteins in the human PPI network to prioritize …
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Association Mapping for Elemental Concentration Resulting from Vegetative Stage Soil Waterlogging Stress in Wheat (Triticum aestivum L.)
… (EC) measured using ICP-AES found significant genotypic variation for Al in both AR13 and LA14, for Fe in AR13 and for Na in AR13 and AR14, with the percent of phenotypic variation explained by genotype ranging from 0 to 60%. Overall, EC were higher in the 2012-2013 than in 2013-2014 growing …
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Recombinant Chromosome Substitution Lines as a Source of Genetic Variation for Drought Stress Tolerance in Barley
Exploring the naturally occurring genetic variation of the wild barley genepool has become a major target of barley crop breeding programmes aiming to increase crop productivity and sustainability in global climate change scenarios. However this diversity remains unexploited and effective …
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The Dynamics of Natural Enemy Resistance in Aphid Populations
… infections, dual protective infections and genotypic variation in the strength of protection.
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Genomic characterization of multi-parental populations of sorghum and rice
… collected for the subsets indicates considerable genotypic variation, and researchers have shown interest in using these lines in their breeding programs. A total of sixteen lines, four from each population, were selected based on the 2018 DS and are being tested at IRRI for physiological traits.
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Physiological Traits and Quantitative Trait Loci Associated with Nitrogen Use Efficiency in Soft Red Winter Wheat
… system. The first study sought to evaluate genotypic variation for N use efficiency (NUE) and identify lines consistently expressing high or low NUE under two or more N rates in a total of 51 N-environments. The results indicated that significant genotype by N rate interactions were …
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Earliness factors in Nordic spring barley (Hordeum vulgare L.) Detection of QTL for growth and development traits in a Golf x Tampar barley mapping population
… (GWAS) and QTL analysis were performed to link genotypic variation to the observed phenotypic variation. Results showed large phenotypic variance in earliness of heading, maturity and height in the population. Year, line type, row type and line ID all significantly influenced phenotypic …
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High throughput phenotyping and quantitative genetics of leaf functional traits in C4 grasses
… 2 were successfully applied across broad genetic variation of hundreds of genotypes in both maize and sorghum. In contrast, work presented in Chapter 3 showed that performance of PLSR models to predict leaf nitrogen are more context dependent, thus resulting in poor performance when applied across …
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The effects of clonal reproduction on population demography, genetic structure, and mating pattern of <i>Dicentra canadensis</i>
… varied significantly among years. Despite strong variation in sexual reproduction, stage-based population models showed stable annual growth rates in all populations and manipulation of pollination had little effect on population growth rates. Populations in forest remnants depended significantly …
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The Structural Basis of Flaviviridae Interaction with Antibodies and Receptors
… the icosahedral virion. Our results suggest that variation of dimer structure and stability may influence the assembly, receptor interaction and uncoating of virions. St. Louis Encephalitis Virus: SLEV) is another member of the JEV serocomplex with similar pathogenesis to JEV. We determined the …
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Quantitative Trait Locus Analysis of Iron Deficiency Chlorosis in Soybean
… the map. The IDC trait displayed continuous variation in the RIL population at each of the 3 or 4 time points. Both genotypic and environmental (year and field block) effects on IDC were significant. Estimated heritability for the IDC trait varied from 26 to 72%. The IDC scales were …
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