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 94 for “"Root length"”.
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An Evaluation of Root Length Change Measurements using Intraoral Scan and Panoramic Radiographs
… of using panoramic radiographs to measure root length change over the course of orthodontic treatment, using intraoral scans of crowns, and a mathematical model to account for distortions in the radiographs. The study additionally evaluated whether a best-fit equation could be created from …
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Post-Transplant Root Production, Mortality, and Periodicity of Landscape-Sized Shade Trees
A more thorough knowledge of rooting behavior of transplanted trees is needed to better understand plant establishment. The objectives of this research were to: 1) determine if transplant timing affected root system regeneration of northern red oak (Quercus rubra L.) and willow oak (Q. phellos L.), …
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Development of root observation method by image analysis system
Knowledge of plant roots is important for determining plant-soil relationships, managing soil effectively, studying nutrient and water extraction, and creating a soil quality index. Plant root research is limited by the large amount of time and labor required to wash the roots from the soil and …
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Root growth of wheat genotypes in hydroponics and soil in relation to water stress tolerance and grain yield
Root characteristics of wheat (Triticum aestivum L.) genotypes are believed to be important in tolerance to drought and flooding, yet neither the extent of differences in root size among modern soft red wheat genotypes, nor the degree of association between root size and drought or flooding …
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Novel Approach to Assess Periodontal Disease Severity Using Volumetric Analysis
… of a maxillary central incisor at full and half root length along the vertical axis is directly proportional to volumetric change. The secondary aim was to evaluate if the variation of root volume is influenced by difference in root morphology.</p> <p>Three dimensional digital models of 70 random …
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Evaluation of seed and seedling response to aid revegetation of hazardous chemical waste sites
… Germination proved to be less sensitive than root length. S. italica had highest ECSOs. In eu 20.7 and 15.3 in Cd. All plant species were grown for 7 days in 0.3, 1.0, 3.0 10.0, and 30.0mg Cu/kg soil and in control. Germination was not effected by metal concentrations in most species …
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Effects of Elevated Atmospheric CO2 on Root Growth, Turnover and Decomposition in a Scrub Oak Ecosystem
… function are not well understood. Measurement of root growth response to elevated atmospheric carbon dioxide is critical to understanding soil carbon input. I investigated the effects of elevated carbon dioxide on fine root growth and decomposition using open top chambers with both ambient and …
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Evaluating Vegetation, Root, and Media Characteristics of a Bioretention Installation and their Influence on Stormwater Retention
… rely on complex interactions between vegetation, root dynamics, and growing media properties. Parameters of three growing media and three vegetation palates in a mature bioretention research facility were investigated in an arid, cold-climate region. Stormwater retention ranged from 0% to 67%, was …
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Acclimation of marine macrophytes (Saccharina latissima and Zostera marina) to water flow
… limited by DIC uptake. Water flow also affected root length in Z. marina but root length and below ground biomass were also significantly affected by sediment type, an indirect effect of water flow.
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Corn root growth and distribution as influenced by soil physical properties
Mechanisms of root growth under variable field conditions were investigated by observing corn ( Zea mays L.) root growth and distribution in the field and by observing the influence of soil physical stresses on corn seedling root growth in controlled environments. The field soil was Groseclose silt …
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Measuring Root Growth Response to Nitrogen Fertilization Rates in Young Pecan Seedlings Using the Minirhizotron Method
… how N affects the establishment of pecan tree roots, specifically fine roots (0-2 mm) responsible for nutrient uptake. The objectives of this study are to: 1) determine how fine root growth is impacted by five rates of N fertilizer and 2) pinpoint times in the growing season when fine root …
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Combining genotyping-by-sequencing data sets for GWAS and GWS study for maize root System architecture traits
Maize has a sophisticated and complex root architecture that is important for plant anchorage and uptake of nutrients and water. Tools such as genome-wide association (GWAS) and genome-wide selection (GWS) can help the breeders to make decisions about which genotypes should advance in their …
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Variation for root and shoot growth among wheat cultivars and the effects of barley yellow dwarf virus on growth
… wheat cultivars to evaluate differences in root growth, to evaluate the effects of barley yellow dwarf virus (BYDV) on root and shoot growth, and to study the effects of a plant growth regulator on root growth of healthy and BYDV infected plants. Cultivars evaluated were Caldwell, Cardinal, …
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The Heritability of Seedling Stage Drought Resistance in Rape and Its Relationship to Seedling Root Morphology
… campestris L.) and its association with seedling root morphology. The heritabilities of seedling stage drought resistance, based on percentage survival data from 40 half-sib families grown under high and low water stress conditions were 43% and 63%, respectively. Comparisons of digital image …
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Plant Species and Soil Type Effects on Root Characteristics, Microbiota and Plant-soil Feedback Responses in Four Prairie Species
… The effects of plant species and soil type on root characteristics, plant-soil feedback and influence on microbiota and arbuscular mycorrhizal colonization were assessed through a manipulative laboratory study. Aster laevis, Parthenium integrifolium, Aster novae-angliae and Andropogon gerardii …
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Gametophytic Selection for Thermotolerance in Phalaenopsis
… Protocorms were evaluated for leaf and root formation 125 days after initial plating. Transfer to warm or cold incubators occurred as protocorms developed leaves and roots. Seedlings were finally transferred to dried sphagnum and placed in growth chambers set to original pollination …
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The incidence and severity of Heterobasidion annosus (Fr.) Bref. in loblolly pine plantations and the effect on radial increment growth
… inoculum. A bulldozer was utilized to excavate root systems of the trees. The root systems of all trees visually estimated to have greater than 1% infection (this included 51% of the trees sampled) were measured with a tape and the root length measurements were categorized as resin soaked, …
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Heterologous Expression of Arabidopsis Thaliana Purple Acid Phosphatase Gene (Atpap15) in Crops for Phytoremediation of Sites Contaminated with Excess Phosphorus
… IHP)- and analyzed for total biomass, primary root length, soluble phosphorus (Pi) content and acid phosphomonoesterase (Apase) activity. Results demonstrated that under high organic phosphorus conditions, transgenic lines presented increased biomass, longer primary root length, high total …
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Negative Effects Of ComMycorrhizal Networks And Roots On Upland Oak Seedlings In Open-Canopy Woodlands And Closed-Canopy Forests
… were grown adjacent to mature oak trees in root exclusion cylinders that alloseedlings access to fungal networks but isolated them from direct root competition. A subset of seedlings was trenched to disconnect them from the network. Response variables were relative growth rate of height and …
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Peningkatan viabilitas benih tembakau (Nicotiana tabacum L) dengan osmoconditiong polyethilene glikol (PEG) 6000
… Capacity Germination, Time Germination, Germ Length and Root Length. To determine if the effect was significant, the data of counted digestibility result were analyzed using One Way Anova. To assure if there was any real influence, the Duncan Multiple Range Test (DMRT) and Polynomial …
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