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 19 of 19 for “"Plant evolution"”.
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EXPLORING LYCOPODIACEAE ENDOPHYTES, DENDROLYCOPODIUM SYSTEMATICS, AND THE FUTURE OF FERN MODEL SYSTEMS
… addressing disparate topics in seed-free plant biology. Firstly, I begin to describe the endophyte communities of lycophytes by identifying the culturable endophytes of five Lycopodiaceae species. Microbial endophytes are integral factors in plant evolution, ecology, and physiology. …
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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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Enzyme structure, function, and evolution in flavonoid biosynthesis
Plant specialized metabolism is a key evolutionary adaptation that has enabled plants to migrate from water onto land and subsequently spread throughout terrestrial environments. Flavonoids are one particularly important class of plant specialized metabolites, playing a wide variety of roles in …
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The role of enzyme promiscuity in plant metabolic evolution
… a key event facilitating the transition of early plants from aquatic to terrestrial environments and their subsequent radiation on land. The breadth and diversity of plant specialized metabolism reflects upon the adaptive innovations that took place during plants' colonization of land in the past …
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The Phenotypic Impact of Transgenic Flower Color Variation in Ipomoea quamoclit.
… engineering may be able to help address plant evolution questions by directly manipulating floral traits at the genetic level, in order to isolate individual traits and examine fitness associated with traits. Pleiotropy is a potentially confounding effect of this approach and must be …
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Grapevine Fanleaf Virus: Biology, Biotechnology And Resistance
… quinoa tissues, and imbuing GFLV with partial plant gene sequences proved the concept that endogenous plant genes can be knocked down. Infectivity of the viral vector depended on the identity of the GFLV strains or reassortants, on coapplication of heterologous silencing suppressors and on …
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The evolutionary history and impact of polyploidy in mustard crops and their relatives
… Together, these processes play a crucial role in plant evolution. Mustard crops (Brassica) such as bok choy, broccoli, cabbage, and canola belong to the tribe Brassiceae within the mustard family (Brassicaceae), nested in the larger order Brassicales. These crops share a relatively recent …
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Evolutionary conservation of host responses to arbuscular mycorrhizal symbiosis in liverworts
… 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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Molecular evolution following allopolyploidization in Gossypium
… 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 genome duplication, indicating that polyploidy plays an important role in modern agriculture. …
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Catechyl-lignin tissues in Vanilla orchid and Candlenut: structure/property studies
… a new type of lignin is another level of lignin evolution. However, the role of C-lignin related to the function of the seed coat is unclear while it exhibits different behaviors to the regular G/S/H-lignin. These points motivated us to conduct cell-wall structure/property studies in the context …
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The Effects of Whole Genome Duplication on Functional Traits and Interactions With Arbuscular Mycorrhizal Fungi
… is one of the most pervasive forces driving plant evolution, 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 …
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The Effects Of Whole Genome Duplication On Functional Traits And Interactions With Arbuscular Mycorrhizal Fungi
… is one of the most pervasive forces driving plant evolution, 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 …
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The role of SCLA-type GRAS transcriptional regulators in plant development and stress responses
… transcriptional regulators are a family of plant 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 …
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The Evolution And Reproductive Ecology Of Oenothera (Onagraceae)
… Onagraceae) is a model system for studying plant reproductive biology. It provides excellent examples of shifts in reproductive traits such as pollination and breeding system, features that have been important in angiosperm diversification. These systems are evolutionarily labile; they …
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The Evolution of Photosystem II Subunit S across the Green Lineage
Light absorbed by plants can have three different fates: it can be used to drive photosynthetic electron transport, be re-emitted as fluorescence or be dissipated as heat (non-photochemical quenching, NPQ). When light levels are too high, NPQ is an important protective process that prevents damage …
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The Phylogenetic Reconstruction of the Grass Family (Poaceae) Using matK Gene Sequences
… 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 phylogenetic questions in the Poaceae using the matK sequences from representatives of different grass groups. In order …
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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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Understanding angiosperm genome interactions and evolution: insights from sacred lotus (Nelumbo nucifera) and the carrot family (Apiaceae)
… gene transfers are driving forces in plant evolution. The transfer of DNA into a genome adds genetic diversity and successfully incorporated genes can retain their original function or develop new functions through mutation. While there are trends and hypotheses for the frequency of …
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Petal cell shape and flower-pollinator interaction in Nicotiana
… shown to affect pollination success in flowering plants. Conical epidermal cells may increase grip for insect pollinators and enhance flower colouration compared to non-conical cells. Nicotiana (Solanaceae) presents a diverse range of petal cell shapes. Interestingly, sister species in at least …