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 96 for “"Poaceae"”.
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A molecular phylogeny of the subfamily Arundinoideae (Poaceae)
The subfamily Arundinoideae has long been considered to be an unnatural assemblage of genera, the relationships of which are obscure or unknown. Because morphological and anatomical data have, to date, been unable to elucidate relationships among these genera, sequence data from two chloroplast …
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Evolutionary history of the canary grasses (Phalaris, Poaceae)
Canary grasses (Phalaris, Poaceae) include 21 species widely distributed throughout temperate and subtropical regions of the world with centers of diversity in the Mediterranean Basin and western North America. The genus contains annual/perennial, endemic/cosmopolitan, wild, and invasive species …
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DNA systematic studies in the genus Bromus L. (Poaceae)
Chloroplast and ribosomal DNA restriction endonuclease analyses were used to assess phylogenetic relationships between different subgenera 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 …
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Mollecular Phylogeny of tribolium (Danthoniodeae: Poaceae) and its taxonomic implications
Molecular sequence data from two noncoding regions of D A (ITS AND TRNL-F) Were used to produce a phylogeny for the genus Tribolium and its African and Australasian allies. Topological comparisons of the combined molecular data with the appended existing morphological tree were made. A significant …
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Molecular phylogeny of Tribolium (Danthonioideae: Poaceae) and its taxonomic implications
Molecular sequence data from two noncoding regions of DNA (ITS AND TRNL-F) were used to produce a phylogeny for the genus Tribolium and its African and Australasian allies. Topological comparisons of the combined molecular data with the appended existing morphological tree were made. A significant …
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Biosystematic studies in the North American Trisetum spicatum complex (Poaceae)
Trisetum spicatum (Poaceae) is circumboreal as well as bipolar in distribution. The species is comprised of both tetraploid and hexaploid cytotypes that display high morphological diversity. Previous taxonomic treatments have resulted in the separation of the species into a series of species, …
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Natural hybridization between two allopolyploid wheatgrasses Elytrigia intermedia and E.repens (Poaceae, Triticeae)
Cí|epnice Disertačnípráce je součástíširšíhoprojektu, kteý hodnotí hybridizaci v komplexu druhi Triticum aestivum-Elytrigia intermedia-E. repens. Tento komplex představujereálný modeloý systémplodina_plevel (planý příbumý) s možným genoým tokem. Cílem projekfu je detekovat a případně ohodnotit …
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The Phylogenetic Reconstruction of the Grass Family (Poaceae) Using matK Gene Sequences
… the family level and within the grass family (Poaceae). There are three major objectives in the research. The first one is to study the utility of the matK gene in plant evolution. The second objective is to characterize the matK gene in the grass family. The last major goal is to address the …
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Phylogenetic relationships of the African species of the genus Merxmuellera Conert (Poaceae: Danthonioideae)
This study expands on existing molecular (rpoC2 and ITS) and morphological data sets to further test the hypothesis of non-monophyly of Merxmuellera sensu lato. The results reveal that despite high levels of resolution, the morphological data yield poorly supported phylogenies due to high levels of …
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An investigation of character variation in Chaetobromus Nees (Danthonieae: Poaceae) in relation to taxonomic and ecological pattern
Character variation in Chaetobromus, a genus of palatable grasses endemic to the arid western areas of southern Africa, was used to derive a classification reflecting taxonomic and ecological pattern. The present study differs from earlier biosystematic investigations by its much more intensive …
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Genetic variation among inland and coastal populations of Distichlis spicata sensu lato (poaceae) in the western United States
The taxonomic status of the North American endemic grass Distichlis spicata subsp. striata has been in flux for more than a century. Distichlis spicata hosts the larval stage of a federally endangered butterfly and is being investigated for use in restoration and recreation, so the relationship …
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The Distribution of ORCUTTIA CALIFORNICA (Poaceae) in the Vernal Pools of the Santa Rosa Plateau, Riverside County, California
<p>Ecological studies were conducted on the rare annual grass Orcuttia californica (Vasey), an endemic to California, from April to September, 1976 in 11 vernal pools located on the Santa Rosa Plateau in Riverside County. To help determine why Orcutt grass occurs in only 6 of the 11 pools and more …
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Metabarcoding pollen to identify allergenic species of grasses (Poaceae) and ragweed (Ambrosia spp.) across six monitored sites in South Africa
… rbcL and ITS2 sequences identified 233 unique Poaceae species, including Lolium perenne (ryegrass), which was one of the 17 species identified by both barcodes. RDP classifications resulted in 48 Poaceae species, with Poa annua (annual bluegrass) and Cynodon dactylon (Bermuda grass) being two …
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Metabarcoding pollen to identify allergenic species of grasses (Poaceae) and ragweed (Ambrosia spp.) across six monitored sites in South Africa
… rbcL and ITS2 sequences identified 233 unique Poaceae species, including Lolium perenne (ryegrass), which was one of the 17 species identified by both barcodes. RDP classifications resulted in 48 Poaceae species, with Poa annua (annual bluegrass) and Cynodon dactylon (Bermuda grass) being two …
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Modern Pollen-Vegetation Relationships In Ghana, Tropical West Africa
… landscapes evidenced by very high proportions of Poaceae pollen. This thesis explores the modern pollen-vegetation relationships of a forest-savannah transitional mosaic, a moist semi-deciduous forest and a wet evergreen rainforest in Ghana, using artificial pollen traps. It also tests the ability …
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Anemofilinių žiedadulkių sklaidos ore ir krūvio Šiaulių mieste įvertinimas /
… aerobic station, it was found that in 2018 poaceae plant pollen stayed in the air for the longest time in Šiauliai. During the study period, from lignified plants analyzed, pollen of pinaceae (776 pollen/m3 air) and pollen from grass plants – urtica (758 pollen/m3 air), poaceae (657 …
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