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 58 for “"polyploid"”.
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Polyploid speciation in the Greater Cape Floristic Region : species limits within Ehrhara calycina
… within E. calycina, and suggest that the role of polyploidy in generating floral diversity in the GCFR may be more important than previously thought.
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Cloning and Characterization of the dominant Inhibitor of Wax 1 (Iw1) gene in polyploid wheat
The Inhibitor of Wax 1 (Iw1) is a dominant inhibitor of glaucousness, the whitish waxy bloom present on the aerial surfaces of a wheat plant: The presence of Iw1 leads to non-glaucousness. In previous work a doubled-haploid population segregating for the presence of the Iw1 locus was created. The …
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Colchicine-induced polyploidy in the azalea cultivar Coral Bells
… 2, 3, or 4 consecutive days. Colchicine-induced polyploidy was found in the first and second histogenic layers but not in the third layer and a completely polyploid shoot was not isolated. Evidence indicates the formation of sectorial and periclinal cytochimeras. Within the single and the …
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Polyploidy in Saccharomyces cerevisiae leads to the loss of cell cycle control in stationary phase
… that suggest that evolution is driven by polyploidization. This evidence must be balanced by recent experiments that demonstrate that newly formed polyploid genomes manifest problems in genomic stability, gene regulation, and development. In order to determine the consequences of nascent …
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Mitotic regulators and their effects on Drosophila : chromosome structure during development
… one extreme, the sister chromatids are separate (polyploid) and at the other extreme, the sisters are held together (polytene). The endocycle itself can be modified and these variations are speculated to correlate with the observed differences in chromosome structure. In this thesis, we have …
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Investigation of the role of polyploidization in glial cells during the development of the drosophila nervous system
… is scaled correctly and can function properly. Polyploidization is a process by which cells increase their DNA content and is used across species to generate large cells. Our lab had previously determined that subperineurial glia (SPG) of the Drosophila melanogaster nervous system become …
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SELF-INCOMPATIBILITY IN CHEIRANTHUS ALLIONII
… of a self-incompatibility (SI) system in the polyploid crucifer, Cheiranthus allionii = Siberian wallflower, was suggested by results of greenhouse screening and confirmed by results of controlled pollinations in the field. Sporophytic control of the system was indicated by a stigmatic barrier …
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Polyploidy and Mitotic Cell Death are Two Distinct HIV-1 Vpr-Driven Outcomes in Renal Tubule Epithelial Cells
… cells (RTECs) induces G2 arrest, apoptosis and polyploidy. The ability of a subset of cells to overcome the G2/M block and progress to polyploidy is not well understood. Polyploidy frequently associates with a bypass of cell death and disease pathogenesis. Given the ability of the kidney to …
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A preliminary study of the MDH variability in Lemna minor - Lemna turionifera /
Lemna minor is a small aquatic polyploid angiosperm which reproduces apomictically and has a worldwide distribution. This study was vmdertaken to characterize the extent and nature of phenotypic variability. The techniques of starch gel electrophoresis were used in this investigation and. MDH …
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Evolutionary dynamics of mechanisms that affect genome size in the cotton genus (Gossypium)
… vary twofold in genome size as well as their polyploid derivative, and using a phylogenetic approach employing as an outgroup Gossypioides kirkii. We assessed the rates and mechanisms operating in four Gossypium genomes: the two co-resident genomes of the allopolyploid G. hirsutum and its …
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The Effects of Whole Genome Duplication on Functional Traits and Interactions With Arbuscular Mycorrhizal Fungi
… yet modelling efforts on the establishment of polyploid plants have shown that early generation polyploids, or "neopolyploids", should experience high extinction rates due to a population demographic disadvantage. A major gap in understanding why established polyploids are so prevalent despite …
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The Effects Of Whole Genome Duplication On Functional Traits And Interactions With Arbuscular Mycorrhizal Fungi
… yet modelling efforts on the establishment of polyploid plants have shown that early generation polyploids, or “neopolyploids”, should experience high extinction rates due to a population demographic disadvantage. A major gap in understanding why established polyploids are so prevalent despite …
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Cloning and characterisation of the waxy genes of wheat and investigation of their potential applications
… diploid progenitors and various genomes of polyploid wheat. The waxy proteins encoded by the waxy genes of the different types of wheat were analysed.
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Linkage mapping in tetraploid blackberry (Rubus spp.) using high-throughput genomic sequencing and restriction-site associated DNA sequencing (RAD-seq)
… research and linkage mapping in cultivated polyploid species of Rubus, in particular blackberry, has lagged behind diploid members of the genus due to the complex analyses required to deduce allele dosage among homologous and homeologous chromosomes. Traditional techniques for studying …
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Delineation of the molecular mechanisms underlying DNA replication initiation and changes in gene copy number during Drosophila development
… to locally underreplicated regions in Drosophila polyploid tissues. We identified copy number changes genome-wide in two additional polyploid tissues and compared our results to three previously profiled larval tissues. These results revealed a high level of tissue-specificity in the number of …
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DNA systematic studies in the genus Bromus L. (Poaceae)
… of Bromus, a genus of over 100 diploid and polyploid species. Variation in chloroplast DNA (cpDNA) fragment pattern was examined, initially, in 15 species of subgenera Festucaria and Ceratochloa. Subsequently, cpDNA restriction site variation was examined in 38 species, using 10 enzymes and …
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Molecular Systematics of <i>Isoëtes</i> (Isoëtaceae) in Eastern North America
… through allopatric speciation, and fertile allopolyploids derived from whole genome duplication following primary hybridization. Phylogenies inferred from whole chloroplast genome DNA sequences using maximum-likelihood and Bayesian inference were fully resolved with high support. Ancestral state …
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Molecular evolution following allopolyploidization in Gossypium
Whole genome duplication (polyploidy) is an important mechanism of speciation and generator of novel genetic and phenotypic diversity, particularly in plants. While over 400 polyploidy events have been identified throughout the angiosperm phylogeny, many crops also have a recent episode of whole …
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Polyploidy inference across time scales in the charismatic carnivorous plant genus Drosera L. (Droseraceae, Caryophyllales)
… the parental lineages of Drosera anglica, a neopolyploid, and in Chapter 3, I explored polyploidy along the backbone of Drosera and inferred the backbone relationship in the genus. I found highly elevated rates of single chromosome change in Drosera subgenus Ergaleium compared to the rest of the …
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Scalable methods for storage, processing and analysis of sequencing datasets
… a Bayesian framework for accurate diploid and polyploid haplotype reconstruction of an individual genome using NGS datasets. Lastly, we extend this haplotype reconstruction framework to high-throughput transcriptome sequencing datasets.
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