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 49 for “"Ecotype"”.
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Dissecting the NCR Peptide Landscape in the R108 Ecotype in Medicago Truncatula and the Search for the NF21325 Symbiotic Mutant
… gaps and sequence divergence compared to the A17 ecotype. Altogether, these findings emphasize the value of combining molecular, phenotypic, and computational approaches to dissect gene function in legume-rhizobia symbiosis, while also cautioning against oversimplified interpretations based on …
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Assessment of silvicultural practices to improve survival and growth of pioneer and mid-successional hardwoods on old field restoration sites
… tree species. This study evaluated seed source ecotype, greenhouse preconditioning and combinations of five mechanical site preparation techniques (mound, bed, rip, disk, pit), four levels of planting stock (gallon, tubeling, bare root, and direct seed), and three planting aids (mat, tube, none) …
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Character displacement in Burkholderia biofilm communities and the effect of adaptive history on the evolution of niche breadth
… of phenotypically and genetically distinct ecotypes each fulfilling a separate ecological role. We found that diversification in the biofilm was associated with altered resource, as each ecotype occupied distinct spatial niches. We then evolved each ecotype in isolation in planktonic …
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The individual and collective behavior of social organisms across environments
… and social networks between two stickleback ecotypes, the “common” type that exhibits typical paternal care and the “white” ecotype where paternal care is significantly reduced. I found that the white ecotype is bolder than the common ecotype. There were also social network differences, with …
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Parasite abundance in Atlantic cod (Gadus morhua) in shallow and deep waters around Iceland
… two stocks there are also coastal and frontal ecotypes which inhabit different depths during the feeding season. Today these ecotypes are detected by molecular sequencing but here I show that parasites as biological tags might be a useful method in cod ecotype identification since results …
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Understanding urban ecology : exploring the ecological integrity of small scale greening interventions in the City of Cape Town
… of Cape Town, within the Cape Flats Sand Fynbos ecotype. The chosen intervention sites were namely: Tokai Park, Princess Vlei and Bottom Road Sanctuary. The study aimed to bridge a gap in the current research by contributing to an understanding of the ecological value of social management and …
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Associated behavioral, genetic, and gene expression variation with alternative life history tactics in salmonid fishes
… polymorphisms to test for associations with ecotype, as well as population structure, in polymorphic populations. First, we evaluated the variation in a suite of ecologically relevant behaviors across time in juvenile progeny produced from crosses within and between migratory and resident …
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Genetic diversity and its consequences for light adaptation in Prochlorococcus
… gene family may define a Prochlorococcus ecotype if those genes are possessed by all members of that ecotype, and if their presence gives that ecotype a selective advantage in some circumstance, thus contributing to the determination of its niche. One gene family is conspicuous for …
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A molecular genetic analysis of resistance to poleroviruses in sugar beet and oilseed rape
… a naturally BMYV resistant A. thaliana ecotype, Sna-1. Crosses of the susceptible ecotype (Col-0) to the resistant ecotype Sna-1 identified the resistance as ‘passive’, where susceptibility was dominant, and conditioned by a monogenic trait. This study began by characterising the gene …
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Effects of Changes of Redox Properties of the Chloroplast ATP Synthase in Arabidopsis
… generated by transformating wild type (Columbia ecotype) plants with the site-directed mutated gene constructs of gamma-subunit. The transgenes were overexpressed behind a constitutive 35S promoter compared with the endogenous gamma-subunit gene. In the isolated mutant chloroplasts, the high …
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Recreating a functioning forest soil in reclaimed oil sands in northern Alberta
… were compared with a range of natural forest ecotypes to identify the age at which the treatments become similar to a natural site with respect to vegetation composition and key soil attributes relevant to nutrient cycling. Ecosystem function was estimated from plant community composition, …
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Trace metals and the ecology of marine cyanobacteria
… members of the low chi BIA (high light adapted) ecotype were less sensitive than strains with high chi BIA ratios (low light adapted). In the field, the in situ concentration of free Cu2+ had a strong effect on the copper sensitivity of Prochlorococcus. Net growth rates were substantially reduced …
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An Ecophysiological study of two key grass species, Anthephora Pubescens Nees and Eragrostis Curvula (Schrad.) Nees
… two key grass species, Athephora pubescens Nees ecotype VH20 and Eragrostis curvula (Schrad.) Nees cultivar Ermelo. Increasing competition resulted in a decrease in the total yield per plant in both species. Eragrostis curvula proved to be the superior competitor, while A. pubescens was evidently …
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Investigating hydrogen peroxide dynamics and the role of plasma membrane aquaporin PIP1:4 in plant sensitivity to ozone.
… protein PIP1:4, along with wildtype Columbia ecotype (Col), were investigated to probe the relationship between the ROS burst and ozone-sensitivity and the potential role of H2O2 transport across the plasma membrane. Ozone-sensitive Cape Verde Island ecotype (Cvi) was included in several …
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Molecular cloning and characterization of two Arabidopsis thaliana sulfotransferases
… was cloned via PCR from Arabidopsis thaliana ecotype Col-0 genomic DNA. A cDNA clone of AtST6 was obtained and fully sequenced. AtST4a and AtST6 were both cloned into the bacterial expression vector pQE30. The recombinant proteins expressed in E. coli were 42 and 40 KDa, respectively. It was …
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When do propagules matter? The role of ecological filters and regeneration dynamics during community assembly in tallgrass prairie restorations
… source of dominant grasses (cultivar vs. local ecotype) and sown subordinate species (three unique pools of non-dominant species) as the subplot factor, respectively. Different sown species pools were included to assess whether any observed differences in propagule abundance or richness between …
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Pectin: New insights from an old polymer through pectinase-based genetic screens
… visible phenotype compared to wild type or other ecotypes and may thus contain a different pectin structure (pec-mutants). After confirming that the altered phenotype occurs only when the pectinase is present, the EMS mutants were subjected to a detailed cell wall analysis with particular emphasis …
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Constraints on plant resistance and tolerance trade-offs
… lines from a cross between the overcompensating ecotype Col-4 and the undercompensating Ler-0 of the annual plant Arabidopsis thaliana were utilized to assess the relationship between tolerance and resistance. Total glucosinolate content for each ecotype following simulated mammalian herbivory …
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Polyamine metabolism in Arabidopsis: Transgenic manipulation and gene expression
… type and transgenic Arabidopsis thaliana (Col 0 ecotype) plants was studied using the techniques of transgenic manipulation and gene expression. Two specific objectives were: (1) To study the effects of inducible and constitutive transgenic manipulation of polyamines via a mouse ornithine …
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Developing Production Techniques and A Site Assessment Tool for Forest Farmed Ramps in Appalachia
… particularly examining best-suited ramp ecotypes, mycorrhizal treatment, and habitat suitability determination. In the first study, bulbs and seeds from diverse Appalachian locations were gathered and transplanted to a common experimental site to investigate the effects of different ramp …
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