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 23 for “"root elongation"”.
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The short term effect of temperature on root elongation and initiation
Thesis (M.S.)--Michigan State University. Dept. of Horticulture, 1971
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Root responses to soil physical conditions and the role of root-particle contact
This thesis considers the elongation o f root and shoots in relation to matric potential and soil strength in contrasting species. The role of root-particle contact for root and shoot elongation in relation to particle/aggregate size and bulk density at various matric potentials is …
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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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Characterization of sugar-insensitive mutants and analysis of sugar-regulated gene expression in Arabidopsis thaliana
… abscisic acid (ABA) on seed germination and root elongation but has a wild-type response to all other phytohormones tested. The sis6-1 mutant carries a cDNA encoding the At4g28240 putative wound-inducible gene on a T-DNA insert. The dominant nature of the mutation suggests that the five-fold …
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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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Metabolomic approaches to understanding the auxin and ethylene response in Arabidopsis roots
… the metabolite responses of Arabidopsis roots to auxin or ethylene. Crosstalk between these hormones regulates many important physiological processes in plants, including the initiation of lateral root formation and the response to gravity. These occur in part through alterations in the …
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Suitability of energy cropping on abandoned metal contaminated farmland.
… a ‘worst case’ scenario. The standard barley root elongation tests, based on International Organisation for Standardisation (ISO) 11269-1,1993, were undertaken to observe the short-term effects of various treatments of the Fuyang soil, with respect to alleviating phytotoxicity to barley, and …
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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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Development of a multi-omics approach to identify highly correlated transcriptomic, proteomic and metabolic signatures in maize B73 and FR697 drought stressed nodal roots
… on maize growth and development. Nodal roots, which develop from the base of the stem and produce the framework of the mature root system, can continue to grow under water stress conditions that inhibit the growth of the leaves and stem. To better understand the molecular mechanisms that …
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TROPANE ALKALOID PRODUCTION BY DATURA
… amounts of tropane alkaloids (<lug/gDW). Root cultures were far more productive (about 1000 ug/gDW total alkaloids). It was shown that the Increase in tropane alkaloid biosynthesis in cultured roots ran parallel with root elongation. Possible explanations for this phenomenon have been …
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The Plant Growth-Promoting Potential of Root-Associated Bacteria from Plants Growing in Stressed Environments
… study in vivo. After using seed germination and root elongation screening in wheat (Trictum aestivum) and sweet clover (Melilotus alba), four isolates were selected for further study—A3 (Pseudomonas sp.) and A9 (Delftia sp.) in sweet clover and A12 (Kluyvera sp.) and B34 (Luteimonas sp.) in …
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Acclimatization physiology in tissue cultured plants
… agar as a solidifying agent was shown to reduce root growth, development and stomatal functioning in these plants. The efficiency of ion and water uptake, and translocation in in vitro and acclimatized tomato plants was assessed using [32P]-orthophosphate and [3H]_ tritiated water. The functional …
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Allelopathic effects of ferulic, gallic, and vanillic acids on corn (Zea mays L.)
… Among the growth parameters investigated, root elongation and dry weight were more affected than either germination or shoot length and dry weight. Radish and corn were more sensitive than peanut. In two-combination experiments, the interactive effects of phenolic acids on corn germination …
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Abscisic acid : interactions with auxin in the regulation of root growth under water deficit conditions
… 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 the primary …
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Recombinant Chromosome Substitution Lines as a Source of Genetic Variation for Drought Stress Tolerance in Barley
… experiment revealed genotypic variation for root traits such as seminal root elongation rate, root diameter and gravitropism that could potentially determine differences in soil water and nutrient acquisition from early stages of development in restrictive environments.<br/><br/>This study …
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Physiological and Molecular Dissection of Salinity Tolerance in Arabidopsis and Maize and Nitrogen Uptake in Wheat
… resulting in restricted Na+ accumulation in roots and shoots as well as increased expression of dehydrin genes such as RD29A and RD29B. Maize prt6 mutant plants, contrary to our observation in Arabidopsis, showed lower seed germination, primary root elongation, and shoot biomass growth along …
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Environmental risk assessment of heavy metals in urban street dust
… flow and road geometry in the risk model. Root elongation, algal growth and light emission of luminescent bacteria were employed for assessing the toxic effect of heavy metals in urban dust. All test organisms showed suppressed response under different concentrations of dust elutriates, …
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Evaluation of Heavy Metals and Metalloid Accumulation in a Small-Scale Aquaponic System and an Effect on Bacterial Antibiotic Resistance
… the HMs on the growth of lettuce, evaluated by root and shoot (edible leaves) elongation was also investigated. The HMs concentration in the aquaponics water over time were not consistent. In general, only As accumulated in the water (P<0.05), but none of the applied metals exceeded the MCL. The …
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Molecular Genetics and Subcellular Localization of Flavonoid Metabolism in Arabidopsis
… abundant in epidermal and cortex cells of the root elongation zone and the root tip, consistent with the accumulation of flavonoid endproducts at these sites. At the subcellular level, both of these enzymes were found to localize to the endoplasmic reticulum (ER), consistent with the hypothesis …
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Plant root development and hormone signalling during drought stress
The plant root system is crucial for plant survival, growth and development, and it plays an important role in plant resistance to drought stress. Drought is one of the primary factors that restrict plant growth and yield, and its threat to crop yields will increase along with the growing food …
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