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 20 for “"Liverworts"”.
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Evolution of Male Gametes in Liverworts
Liverworts are speciose, morphologically diverse, and members of an ancient lineage that is now recognized as the sister group to all other land plants. Spermatozoid ultrastructural characters have provided insight on interrelationships among plant groups as well as the puzzling placement of some …
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Evolutionary conservation of host responses to arbuscular mycorrhizal symbiosis in liverworts
… genes were recently shown to be conserved in liverworts and hornworts, but evidence of them being associated with symbiosis in bryophytes is scarce. The present study aimed to bridge this knowledge gap by investigating the evolutionary conservation of AMS molecular pathways in the liverwort …
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Bryophyte and macrolichen diversity of the Purdiaea nutans forest in southern Ecuador and its relationship to soil, climate and vegetation structure
… high species numbers of mosses and Macrolichens; liverworts are relatively more pronounced in our study sites. The extremely high precipitation of the area favours liverworts and strong winds constrain the growth of projecting or hanging species such as Meteoriaceae and macrolichens typical for …
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Using the psba Gene as a Measure in Determining the Phylogenetic Relationship among Bryophytes.
… currently two popular but conflicting ideas: the liverworts-basal topology (LBT) and the hornworts-basal topology (HBT). This psbA gene study provided additional information to help resolve the debate. <em>Bazzania</em>, <em>Blasia</em>, <em>Megaceros</em>, and <em>Sphagnum</em> psbA gene …
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BRYOPHYTE ASSEMBLAGES ON AMERICAN HORNBEAM (CARPINUS CAROLINIANA) AND THE SURROUNDING ARBOREAL COMMUNITIES WITHIN THE FOREST OF EAST TEXAS
… with approximately 13,000 species), the liverworts (Marchantiophyta with approximately 5,000 species), and the hornworts (Anthocerotophyta with approximately 150 species). Initial observations indicated that the midstory tree Carpinus caroliniana Walter (American hornbeam) has a bryophyte …
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Molecular systematics of the leafy liverwort family Lophoziaceae cavers
… of phylogenetic relationships in the leafy liverworts with emphasis on the various elements usually placed in Lophoziaceae. The following conclusions are drawn.
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Liverwort-Fungal Associations: Novel Symbioses In Polar Regions?
… of the most ancient groups of land plants — the liverworts — and in the bryophyte enriched floras of the polar regions. This study provides the first large-scale survey of fungal colonisation of liverworts on Svalbard in the High Arctic and on South Georgia in sub-Antarctica, increasing current …
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Bryophytes in the hydrological cycle and climate change implications : A case study of La Réunion cloud forest
… to the in situ water content of the liverworts. The abundance of both species and their cloud water interception ability together with the wide range of photosynthetic tolerance of M. diclados and the large water storage capacity and slow desiccation rate of B. decrescens make both …
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COMPARATIVE ULTRASTRUCTURE OF APICAL CELLS AND DERIVATIVES IN BRYOPHYTES, WITH SPECIAL REFERENCE TO PLASMODESMATA
… mosses have tetrahedral apical cells and the liverworts possess tetrahedral, hemidiscoid and lenticular AC geometries. The primary cell wall in the studied taxa is comprised of two layers. A fibrillar layer, which is the outer wall layer, contains compacted cellulosic fibrils, and represents …
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The role of SCLA-type GRAS transcriptional regulators in plant development and stress responses
… This thesis investigates the GRAS family in liverworts. Mp*GRAS7*, a GRAS gene in the liverwort *Marchantia polymorpha* (common name: Marchantia) was found to be transcriptionally responsive to stress, and it was hypothesised that it had a role in controlling biological responses to the …
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The bryophyte flora of Bridal Veil Falls, British Columbia : an analysis of its composition and diversity
… is composed of 210 species (150 mosses and 60 liverworts). In addition, Barbula convoluta var. gallinula was found new to British Columbia. An analysis of bryophyte occurrence in habitats showed that high species diversity can be attributed to the wide variety of both habitats available at the …
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Phylogenetic relationships of the Genus Andreaea Hedw.(Andreaeceae,Bryophyta) as inferred from RPS4 and TRNL-F sequences and morphology
… possesses some sporophyte features that resemble liverworts or mosses and some gametophyte features resembling only the mosses, whereas other features are unique. This thesis presents the first phylogenetic study of the genus, based on both morphological and molecular evidence. Gametophyte and …
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Bryophyte Community Response to Prescribed Fire and Thinning in Mixed-Oak Forests of the Unglaciated Allegheny Plateau
… a total of 116 bryophyte taxa (97 mosses, 19 liverworts). Of these, only 65 were found in more than 5% of the transects. Burning in xeric sites clearly altered bryophyte community richness and composition as burned sites had a 50% 4 reduction in mean richness and a disproportionate decrease in …
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Early land plant origins of the MYB-bHLH-WDR complex
… for trichome and root hair patterning, and in liverworts, for specialised metabolism in a lineage-specific organelle, the oil body.
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Mid Cretaceous fossil forests of Alexander Island, Antarctica
… vegetation dominated by Taeniopteris, liverworts, angiosperms and ferns, occupied river channel banks where frequent floods provided fresh surfaces for these early colonising plants to flourish. Patch forest communities dominated by podocarp conifers, ginkgo trees, cycadophytes and …
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Palaeoclimatic impacts on the phylogeography of an Afro-montane liverwort: Jamesoniella colorata (Lophoziaceae )
… major palaeoclimatic trends in South Africa. Liverworts are generally well-suited for phylogeographical studies because they often have low dispersal rates, broad geographical ranges and long evolutionary persistence. In addition, the high among-population diversity observed in J colorata is …
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Diversity and biogeography of Madagascan bryophytes with an analysis of taxic and functional diversity along an elevational gradient in Marojejy National Park
… 254 epiphytic bryophytes species including 157 liverworts and 97 mosses were reported. Species richness distribution has a hump-shaped pattern along the elevational gradient, with a richness peaking at mid-elevation, 1250 m. My results suggest that middomain-effect was the most effective in …
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From Genes to Traits and Ecosystems: Evolutionary Ecology of <i>Sphagnum</i> (Peat Moss)
… absent from seedless plants including mosses, liverworts, and ferns. These results suggest that the production of red-violet flavonoid pigments in seedless plants, including sphagnorubins, requires the activity of novel enzymes and represents convergent evolution of red-violet coloration across …
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The Phylogenetic Reconstruction of the Grass Family (Poaceae) Using matK Gene Sequences
… from GenBank representing seed plants and liverworts and nine partial sequences generated for genera representing the monocot families Poaceae, Joinvilleaceae, Cyperaceae, and Smilacaceae were analyzed. The study underscored the following useful properties of the matK gene for phylogenetic …