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 77 for “"Land plants"”.
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Frameworks for reprogramming early diverging land plants
… processes remain poorly characterised in plants. However, engineering approaches can provide new tools and frameworks for the study and manipulation of plant development. This dissertation describes the development of engineering frameworks for reprogramming of the early diverging land …
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Pre-vegetation alluvium: Geological evidence for river behaviour in the absence of land plants
… alluvium is unique; at the present day, plants affect multiple aspects of river functioning and deposition and so those rivers that operated before the evolution of land plants largely lack modern sedimentological analogue. However, such rivers were the norm for the first 90% of Earth …
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Evolutionary conservation of host responses to arbuscular mycorrhizal symbiosis in liverworts
Arbuscular mycorrhizal symbiosis (AMS) arose in land plants more than 400 million years ago, perhaps acting as a major contributor to plant terrestrialization. The ability to engage in AMS is evolutionarily conserved across most clades of extant land plants, including early diverging bryophytes. …
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Using the psba Gene as a Measure in Determining the Phylogenetic Relationship among Bryophytes.
<p>The evolution of land plants, particularly the origin of land plants, had long been an issue of concern to biologists. Bryophytes were widely accepted as the first land plants to have emerged during the evolution of land plants (Kenrick 1997, Mishler 1994). But, the phylogeny of the groups …
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Utilising CRISPR/Cas9 mutagenesis to understand stress-induced flavonoid biosynthesis and regulation in Marchantia polymorpha : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Biological Sciences at Massey University, Palmerston North, New Zealand
… are secondary metabolites that evolved during land plant colonisation to provide protection against the plethora of abiotic and biotic stresses present in a terrestrial environment. The bryophytes lineage is thought have arisen at the first branching event during evolution of the extant land …
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A bright, sweet evolution: a molecular genetic analysis of Calvin cycle gene expression response to light and sugar in the liverwort marchantia polymorpha, and insights into Calvin cycle promoter motif enrichment in land plants
Higher plants are frequently used as model organisms in Calvin Benson Bassham cycle (CBB) research given their ease of use in the laboratory. The expression of CBB genes in higher plants is well known to be regulated by light, sugar and plant development, yet no focus has been given to lower plant …
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Understanding Plant Response to Stress Using Gene Model Quality Evaluation and Transcriptome Analysis
… overall aim of the project was to understand how plants reacted to environmental stress and evolved to overcome it. The land plants that we see today evolved from a green algal ancestor around 510 million years ago. Plants had to make significant changes to their cellular, morphological, …
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Major transitions in the plant tree of life: insights from genes, genomes and traits
The evolution of plants transformed the Earth’s surface, atmosphere and climate and enabled the colonisation of new habitats, promoting the diversity of other lineages spanning the tree of life. The evolutionary history of plants has been marked by major transitions such as multicellularity, …
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Some South African red seaweed polysaccharides
… reserve polysaccharides, analogous to starch in land plants, and into structural polyrsaccharides, analogous to cellulose in land plants. Laminarin from brown seaweeds and Floridean starch from certain red algae are reserve polysaccharides while algihates (from brown seaweeds) and carrageenin and …
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An Investigation into the Evolution and Function of RNA-Directed DNA Methylation and its Component Proteins
… (RdDM) is a major epigenetic pathway in plants that is required to establish methylation in all contexts and maintain CHH methylation. The function of RdDM is mediated by multiple proteins that are still being characterized in land plants. Pol IV and Pol V form a major part of the RdDM …
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ULTRASTRUCTURE, IMMUNOCYTOCHEMISTRY, AND BIOINFORMATICS OF SPORE DEVELOPMENT IN THE MOSS PHYSCOMITRELLA AND THE HORNWORT DENDROCEROS
… highly resistant biopolymer sporopollenin. All land plants produce spores. Spore development is described in <italic>Physcomitrella patens</italic>, a moss with single-celled spores, and <italic>Dendroceros</italic>, a hornwort with multicellular spores. Correlated light, fluorescence and …
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EXPLORING LYCOPODIACEAE ENDOPHYTES, DENDROLYCOPODIUM SYSTEMATICS, AND THE FUTURE OF FERN MODEL SYSTEMS
… the endophyte communities of all major groups of land plants have yet to be characterized. Secondly, I begin to re-evaluate the systematics of a historically perplexing genus, Dendrolycopodium (Lycopodiaceae). Lastly, I assess the status of developing fern model systems and discuss possible future …
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The effect of UV-B radiation on flavonoid accumulation and gene expression in Marchantia polymorpha
… closest living representation of the earliest land plants and as such may give insight into the response that allow the first land plants to transition from the aquatic environment onto the terrestrial. One such adaption allowing this transition was to that of UV-B radiation and is the main …
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The role of SCLA-type GRAS transcriptional regulators in plant development and stress responses
… proteins, which are highly conserved across land plants and have diverse functionality. Many of these roles involve responding to environmental stimuli, and the signalling processes involving most GRAS proteins are fairly well understood in flowering plants. This thesis investigates the GRAS …
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THE SPECIAL WALLS AROUND GAMETES IN CERATOPTERIS RICHARDII AND AULACOMNIUM PALUSTRE: USING IMMUNOCYTOCHEMISTRY TO EXPOSE STRUCTURE, FUNCTION, AND DEVELOPMENT
… cells formed during the sexual life cycle of plants. The ancestral condition of gametes in land plants is the production of small motile sperm cells and larger non-motile eggs. Unique walls or cell matrices are formed during the development of these highly specialized cells, and are integral …
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Role of the small subunit of Rubisco in the green algal phylogeny and Carbon Concentrating Mechanism expression
… found in streptophyte algae closely related to land plants (streptophytes) reflect the strength of any CCM and pyrenoid leakiness, whereas Rubisco in extant land plants reflects more recent selective pressures associated with the terrestrial atmospheric environment. This research also provides …
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On the role of pectin methylesterases in the development of the non-vascular land plant model Marchantia polymorpha
… a highly abundant component in the cell walls of land plants and charophyte algae. From angiosperms, we know that the methylesterification of pectin polymers by PMEs is implicated in growth regulation as well as interactions with the surrounding environment, including microbes. However, little is …
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Charcoal chemistry : developing a proxy for paleofire regimes.
… over geologic time since the evolution of land plants and affect global biogeochemical cycling and ecosystem processes. Charcoal particles in the geological record may contain information on several aspects of paleowildfire regimes. The fire intensity, the energy produced during a fire, is …
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Fossil C 4 plant signals in Southeast Atlantic Ocean continental margin sediments indicate climate-dependent vegetation changes on the adjacent continent
… changes in the predominance of C4 or C3 land plants. Leaf waxes of 35 C4 grasses and three C3 grasses were analysed. These investigations revealed that C4 grass waxes have significantly higher compound-specific delta13C values, high contents of n-C31 and n-C33 alkanes and the abundance of …
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Measurement of lignin and organic carbon in Lake Mead sediment
… is a useful tool for tracing the transport of land derived organic matter in an aquatic environment. Tetramethylammonium hydroxide (TMAH) thermochemolysis at sub-pyrolysis temperatures of 300°C followed by GC-MS analysis showed a great promise in being able to semi quantitatively assess the …
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