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 30 for “"Salinity tolerance"”.
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Salinity Tolerance of Flowering Rush, Butomus umbellatus
… to estuarine areas, documentation on the salinity tolerance of flowering rush is scarce. Currently, information is limited to anecdotal reports suggesting intolerance to saline conditions. A better understanding of the osmotic tolerance of this species is essential to providing insight …
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Drought and salinity tolerance of cool-season turfgrasses
… in a greenhouse study, respectively. The drought tolerance trial is presented in Chapter 1. In it, the drought tolerance of thirty-five cool-season turfgrasses, including 15 Kentucky bluegrass lines, 19 tall fescue lines, and 1 perennial ryegrass line were evaluated under three deficit irrigation …
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Salinity tolerance and osmoregulation in several subtropical decapods
This study investigated salinity tolerances and osmoregulatory strategies of several subtropical brachyuran mangrove crabs and an anomuran prawn, with particular reference to Uca vocans, Uca urvillei, Uca chlorophthalmus, Uca annulipes, Dotilla fenestrata, Macrophthalmus depressus, Macrophthalmus …
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Physiological and Molecular Dissection of Salinity Tolerance in Arabidopsis and Maize and Nitrogen Uptake in Wheat
… negative regulator of flooding and low oxygen tolerance in plants. This study investigated the role of this pathway in adaptation to salinity stress in Arabidopsis and maize via physiological and molecular characterization of Arabidopsis prt6-1 and maize prt6 MU insertion mutants, respectively. …
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Effect of salinity and environmental changes on the fish community of the St Lucia Estuarine System with focus on the salinity tolerance of Oreochromis mossambicus (Mozambique Tilapia)
… species. The study investigated the effect of salinity and environmental changes on the fish community structure of the St Lucia system during periods of mouth closure as well as after opening of the new beach channels connecting St Lucia to the Mfolozi system.Sampling was conducted from May …
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Effects of arbuscular-mycorrhizal fungal colonization on management of saline lands
… fungal inoculation in increasing plant salinity tolerance and establishment in saline conditions were related to the responses of host species to AM fungi. Pre-inoculation with Glomus intraradices increased plant growth, nutrient uptake and establishment of mycorrhiza responsive …
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Patterns of Evolutionary Conservation and Divergence in the Short-Term Hyposalinity Stress Response of a Euryhaline Diatom, Skeletonema marinoi
… Diatoms may constitute one such lineage, as salinity tolerance among extant species is diverse, and the observation of frequent historic habitat transitions between marine and freshwater environments indicates that diatoms successfully mitigated (low) salinity stress in the past, followed by …
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Linking ecological divergence and reproductive isolation: a tale of two killifish
… and L. parva are differentially adapted to salinity with L. goodei being primarily freshwater and L. parva being euryhaline (able to tolerate a wide range of salinities). In my thesis I determined the extent to which divergent natural selection (with regard to salinity tolerance) has led to …
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Effects of size, age and photoperiod on hypoosmoregulation in brook trout, Salvelinus fontinalis
… seawater for 20 d to investigate the ontogeny of salinity tolerance. A single experiment examined daily changes in plasma osmolarity, [Na+], [Cl-], [K+], [Mg2+], thyroxine, hematocrit and gill Na+,K+-ATPase during adaptation to 10 ppt, 20 ppt and 32 ppt. Size was the primary determinant of …
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Effects of interspecific competition, salinity, and hurricanes on the success of an invasive fish, the Rio Grande cichlid (Herichthys cyanoguttatus)
… with L. macrochirus, a native fish, and what salinity tolerance this species has. Surveys on Lake Pontchartrain and in the GNOMA indicated that H. cyanoguttatus is well established in urban habitats. These surveys also indicate that H. cyanoguttatus has spread rapidly into Bayou Saint John and …
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Development and Standardization of a Short-Term Assay for Evaluating Polluted Estuarine and Coastal Environments: The Medaka Embryo-Larval Assay
… selected for extensive evaluations of salinity tolerance and the accuracy of the topical exposure method for representing a typical immersion exposure. The amount of material actually penetrating the eggs was determined for a number of these chemicals, as were the optimum rearing …
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Investigating the molecular mechanism whereby auxin modulates Arabidopsis thaliana growth under salinity stress conditions
… global problem in irrigated agricultural land. Salinity imposes both an osmotic and ionic stress on plants, the latter of which is unique to salt stress. Previous work has indicated that the plant growth hormone auxin could play an important role in ionic stress tolerance: transcriptome …
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Measuring the Physiological Effects of Methylobacterium oryzae Foliar Inoculation onto Salt-Stressed Tomatoes grown in a Greenhouse Semi-Hydroponic System
<p>Salinity stress has been shown to improve hydroponic produce quality such as that of tomato but at the trade-off of produce yield. In order to improve demand for hydroponic produce, techniques that improve salinity tolerance could offset declines in yield without altering the improved quality of …
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Microbial adaptation, differentiation, and community structure
… First, we study the potential temperature and salinity range of 16 marine Vibrio strains. We nd that salinity tolerance is at odds with the strains' natural habitats, and provide evidence that this incongruence may be explained by a molecular coupling between salinity and temperature tolerance. …
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Molecular mechanisms of stress tolerance in plants
… and strategies for improving resistance and tolerance in crops. In the present thesis, we describe two different approaches that increase our understanding of mechanisms of stress tolerance in plants. The first approach is to study an extreme adaptation to dehydration tolerance from a plant …
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Economic Impact Analysis of Marker-Assisted Breeding in Rice
Abiotic stresses such as salinity and phosphorous (P) deficiency are major yield-limiting factors for rice, particularly on marginal lands. Marker-aided backcrossing (MAB), enabled by advances in genomics and molecular mapping in recent years, is said to be a more precise, time-saving, and …
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Denitrification Under Salinity Stress in Biofilm Reactors
… etc. To improve the process’ performance under salinity inhibition, biofilm reactors could represent an elegant strategy, but a systematic analysis focusing on the reactor system under salinity stress is needed for their optimisation. Moreover, since the electron donors available for the process …
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EXAMINING THE GENETIC BASIS AND PHYSIOLOGY OF SURVIVAL IN EXTREME LOW SALINITY TO IMPROVE AQUACULTURE OF THE EASTERN OYSTER Crassostrea virginica
… coastal aquaculture operations to extreme low salinity (< 5), resulting in reduced productivity and mortality. The primary objectives of this dissertation were to investigate the biology and genetic basis of low salinity tolerance to improve eastern oyster aquaculture. In Chapter 2, I developed …
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