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 “"gametophyte"”.
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THE FEMALE GAMETOPHYTE: DEVELOPMENT AND FUNCTION
… the diploid sporophyte and the haploid gametophyte. The female gametophyte of flowering plants develops within the ovule, a specialized structure within the ovary, which gives rise to the seed after fertilization. Sexual reproduction in plants entails a series of developmental steps that …
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GENETIC NETWORK CONTROLLING FEMALE GAMETOPHYTE AND EMBRYO DEVELOPMENT IN ARABIDOPSIS THALIANA
… The identification of genes involved in female gametophyte formation is of significant interest since they are of great importance for plant reproduction. In the last year, different researches have been done in order to identify genes important for embryo sac development. In particular, I was …
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The role of bZIPtranscription factors in the male gametophyte of Arabidopsis thaliana
Disertační práce: Role bZIP transkripčních faktorů v samčím gametofytu Arabidopsis thalinana Abstrakt Pohlavní rozmnožování u rostlin závisí na produkci a správné diferenciaci gamet v rámci haploidní gametofytické generace. V současnosti je stále nedostatek poznatků týkajících se pochopení …
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Profiling gene expression during early gametophyte development and sex determination in Ceratopteris richardii
… to develop as either a male or hermaphroditic gametophyte. Gametophyte sex is determined by a GA-like pheromone (ACE) that is secreted by hermaphrodites approximately 6 days after spore inoculation and induces male development in other juvenile gametophytes. Our goal is to better understand the …
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THE ROLE OF AURORA KINASE IN THE DEVELOPING MALE GAMETOPHYTE OF MARSILEA VESTITA
The development of the male gametophyte of Marsilea vestita occurs via an ordered sequence of cellular events, which result in the formation of 32 motile sperm. The blepharoplast is a subcellular structure that arises de novo at ~3.5 hours following microspore hydration and functions as a …
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The Search for Modifiers of the Maze Gametophyte Factor Ga1-s and Quantitative Trait Polymorphisms Emerging from Doubled-Haploid Maize Lines
… localization of the modifiers of the maize gametophyte factor (<em>Ga1-s</em>) and the second project was to establish and identify heritable polymorphic lines that have descended from a single doubled-haploid B73 plant. The objectives were (1) to search for modifier genes and loci on the …
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Phylogenetic relationships of the Genus Andreaea Hedw.(Andreaeceae,Bryophyta) as inferred from RPS4 and TRNL-F sequences and morphology
… 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 sporophyte characters were …
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PHYSIOLOGICAL STUDIES USING TISSUE CULTURES OF PLATYCERIUM CORONARIUM (KOENIG) DESV
… ferns. Apogamous sporophytes were produced on gametophytes cultured in the presence on 40 µM indole-3-acetic acid (IAA). When ethylene was allowed to accumulate in the culture vessels in the presence of IAA, the frequency of regeneration and the total number of apogamous sporophytes producted …
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The biosystematics of pteridophytes: aspects of morphology and reproductive biology of some epiphytic ferns
<p>Characteristics of fern gametophytes relate to their habitats. Epiphytic habitats are generally covered by bryophyte mats, making a challenging environment for sporophyte production by resident fern gametophytes. Gametophyte morphology and reproductive biology of several epiphytic ferns, …
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The ecology and demography of the introduced macroalga Undaria pinnatifida (Harvey) Suringar in Port Phillip Bay, Victoria, Australia
… and photoperiod on germination of zoospores, gametophyte growth and reproduction of U. pinnatifida in culture. Information on its recruitment, growth and reproductive capacity in the field is also presented for the first time for a population Australia.
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Elevated temperatures create bottlenecks in the life history of bull kelp (Nereocystis luetkeana, Phaeophyceae)
… (10, 12, 15, and 18°C) on the development of gametophytes and young sporophytes cultured from field-collected sori over four weeks. The density of female gametophytes declined significantly at 15°C and 18°C, while the density of male gametophytes remained consistent across temperatures, …
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Integrative high-throughput study of arsenic hyper-accumulation in Pteris vittata
… The transcriptome of the <em>P. vittata</em>gametophyte under arsenate stress was obtained using RNA-Seq technology and Trinity <em>de novo</em> assembly. Functional annotation of the transcriptome was performed in terms of blast search, Gene Ontology term assignment, Eukaryotic Orthologous …
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A proteomic investigation of the rhizomes of the resurrection fern Mohria caffrorum L. (Desv.) in response to desiccation
… leaf senescence, shoot system morphogenesis and gametophyte development, among others.
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Small RNAs within the developing seed of Arabidopsis thaliana
… cell and the egg cell of the unfertilized female gametophyte, finding preliminary evidence that sRNAs might move between these cells, as has been previously hypothesized. This work contributes to our understanding of the role of sRNAs within the developing seed and their relationship with other …
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Molecular phylogeny, phylogeography and population genetics of the red seaweed genus <i>Asparagopsis</i>
… Even after removal of the carpogonia, gametophyte thalli exhibited multiple allelic patterns, which is indicative for polyploidy. The markers were then used to assess genetic structure and diversity within and among Mediterranean populations of <i>A. taxiformis</i> lineages 1 and 2. …
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Studies of E2s Related to Unconventional Ubiquitination in Arabidopsis thaliana
… the formation of functional megaspore and female gametophyte. Moreover, certain ubc22 mutant plants showed distinct phenotypes in vegetative development. The RNA-seq analysis revealed that genes of different pathways were differentially affected in different subtypes of plants. Plants of one …
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Investigating the role of RNA 5- methylcytosine on ribosomal and transfer RNAs in Arabidopsis thaliana
… nop2a nop2b mutants were lethal due to female gametophyte abortion at the two to eight-nucleate stages. Reduction of NOP2A in nop2b nop2c mutants using an artificial miRNA led to a range of post-embryo phenotypes, impaired ribosome activity and reduced m5C methylation of C2268 on the 25S rRNA. …
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The development of Mazzaella capensis (J.Ag.) Fredericq in culture, in the field, and the effect of environmental factors
… potential and of patterns and mechanisms of gametophyte / sporophyte alternation. The South African Atlantic species, Mazzaella capensis, however has been neglected in these studies. This project sets out to investigate some basic hypotheses on the biology of M. capensis. The rate of …
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Physiological effects of climate change and estimations of carbon standing stock of southern Salish Sea kelps
… In our second experiment, we exposed microscopic gametophytes from the same two populations to a fully crossed experiment manipulating temperature (12 and 18 C) and pH (8.0 and 7.5) for one month. Because the gametophyte stage governs reproduction, recruitment, and long-term population …
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Gametophytic Selection for Thermotolerance in Phalaenopsis
Gametophytic selection was examined as a breeding tool in developing Phalaenopsis hybrids that are more cool or warm temperature tolerant. Two hybrid Phalaenopsis, P. (Taisoco Windian à Sogo Sogo Yukidian) by P. hybrid unknown, were reciprocally cross-pollinated and exposed to 14°C/9°C for 7 days …