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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 154 for “"root growth"”.
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Toxicity of manufactured particulate materials on plant root growth
… particles are evaluated by means of a root elongation test in this study. The particles studied include 13-nm alumina, 14-nm hydrophilic silica, 21-nm titania, 161.2-nm spherical hydrophilic silica, 1 .0-um alumina, 667.6-nm spherical hydrophilic silica, and 0.96-um titania. Six plant …
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Forest Productivity as a Function of Root Growth Opportunity
… forest management practices can reduce tree growth, but the causes of growth reduction are usually complex interactions between soil properties and tree species. We used a 7 by 7 factorial greenhouse experiment to create a matrix of bulk density ((Ï b)) and volumetric water content (θv) to …
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Development of a Low-Cost System for Monitoring Root Growth Dynamics
Understanding root system dynamics is crucial for improving plant resilience and optimising resource allocation in agriculture and forestry. Despite the importance of monitoring root dynamics, roots remain difficult to study because of their below-ground structure. Minirhizotrons – root imaging tools …
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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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Factors controlling root growth in heterogeneous substrates: physical structures and root behaviour
Roots are essential for nutrient uptake and anchorage for the plant, however there is published evidence to suggest that the physical structure of soil has a strong influence on their abilities to grow and develop healthily. Observing roots in 3-dimensions, <i>in situ</i> and non-destructively is …
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High throughput profiling of transcription factors involved in soybean root growth under water deficit
… limiting crop productivity worldwide. Plant root and shoot systems respond to environmental changes by altering the expression of complex gene networks through sensing environmental stresses and modifying signaling and metabolic pathways. Previous work (Yamaguchi et al., 2009) showed that the …
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Function of abscisic acid in maintenance of maize primary root growth under water deficit
… is required to maintain maize primary root elongation under water deficit and that one of the functions of ABA is to restrict ethylene evolution. These studies were conducted by using carotenoid deficient seedlings to induce ABA deficiency. Using the recently available ABA-deficient …
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Root growth potential and outplanting performance of loblolly pine seedlings raised at two nurseries
Root growth potential CRGP) is the measure of seedling ability to grow new roots. Loblolly pine (Pinus taeda L.) seedlings from 5 seedlots were raised at two widely separated nurseries (Summerville, SC and New Kent, VA). In Experiment I, RGP was determined during the fall and winter of 1984-85 and …
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Abscisic acid : interactions with auxin in the regulation of root growth under water deficit conditions
Water stress has been shown to inhibit shoot growth more than root growth (Sharp et al., 1988). Abscisic acid (ABA) has been shown to be involved in this differential growth response in maize (Zea mays L.) seedlings (Saab et al., 1990; Sharp et al., 1994). ABA accumulates in the elongation zone of …
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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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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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Root growth potential and bud dormancy of three northern pines with emphasis on eastern white pine
A two year study examined Root Growth Potential (RGP) in a hydroponic system and Dormancy Release Index (DRI) in one-year-old (1-0) and two-year-old (2-0) eastern white pine (Pinus strobus L.), red pine (Pinus resinosa Ait.), and Scotch pine (Pinus sylvestris L.) seedlings with emphasis on eastern …
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The influence of preplanting dips and postplanting temperatures on root growth and development of tulips, hyacinths, and daffodils
Thesis (M.S.)--Michigan State University. Dept. of Horticulture, 1976
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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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Changes in loblolly pine seedling root growth potential over time, during cold storage, and among half-sib families
Root growth potential (RGP), the ability of a transplanted seedling to rapidly elongate existing roots and initiate new roots, is used as an indicator of seedling physiological quality. Three separate experiments were conducted on loblolly pine RGP during 1983-84 and 1984-85 using 1-0 nursery-grown …
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Effects of nitrogen and cutting management on root growth and productivity of a Kentucky bluegrass (Poa pratensis L.) and white clover (Trifolium repens L.) pasture
… (N) and defoliation effects on productivity, root growth and soil nitrate (NO3-) in a Kentucky bluegrass and white clover pasture were examined. Nitrogen was applied annually in two equally split applications at rates of 0, 80 or 160 kg N ha -1. After reaching 12.7 cm, plants were cut to 2.5, …
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Complementation of an AtCAM3 knockout line restores wild type root growth and provides localization data through expression of a chimeric GFP:AtCAM3 fusion protein in Arabidopsis thaliana
Regulation of growth and acclimation to biotic or abiotic stressors involves a multitude of signal transduction events in higher eukaryotes, and oscillations in cytosolic Ca2+ are one highly conserved mechanism for transducing these signals. In Arabidopsis thaliana there are four main isoforms of …
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Root growth potential and weed control effects on the first year growth of pitch x loblolly pine (Pinus ridiga x P. taeda L.) and loblolly pine
… and westvaco loblolly pine (WCO-Iob). Lateral roots had the greatest response to the Oust treatment compared to all other seedling parts. All seedlot and treatment interactions were associated with lateral roots. After one growing season the Oust treatment resulted in a 148% increase in lateral …
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Studies on the POLARIS gene of Arabidopsis
… a 36 amino acid peptide required for correct root growth and vascular patterning. Previous work indicates that PLS acts as a negative regulator of ethylene signalling. The pls mutant has enhanced ethylene signalling, which is the key determinant of its short root phenotype and results in a …
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