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 25 for “"pollen tube"”.
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Metabolism of Phytic Acid in Pollen of Lilium Longiflorum Thunb. And Mathematical Modeling of Wall Polysaccharide Formation During Pollen Tube Growth (Phytase, Simulation)
… literature about phytic acid metabolism in pollen is limited. The accumulation of phytic acid during development of lily pollen and its degradation during germination and tube growth were studied. Phytase which is responsible for phytic acid breakdown was isolated from ungerminated and …
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Pollen Tube Growth Characteristics of Selected Crabapple Cultivars and Managing Apple (Malus x domestica) Crop Load and Early Season Diseases with Organic Bloom Thinning Chemicals
… are discussed. The first project analyzed the pollen tube growth of several crabapple cultivars. Previous research had improved the use of bloom thinning chemicals, by coordinating the application timing with the pollen tube growth between pollination and fertilization. However, pollen tube …
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Arabidopsis thaliana P4-type ATPases ALA4 and ALA5 are Necessary for Normal Cellular Elongation in Developing Vegetative Tissues and Rescue the Pollen Tube Deficiencies in Knockout ala6/7 Mutants
… brasinolide. An RFP-tagged ALA4 was expressed in pollen to test its ability to rescue the fertility defect associated with a combined loss of ala6/7, the two most closely related ALAs that were previously shown to be important for normal pollen tube tip growth. The RFP-ALA4 was found to fully …
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In vitro studies of the impact of ozone and sulfur dioxide on the pollen of Fraser fir (Abies fraseri (Pursh) Poir.)
… in vitro ozone and sulfur dioxide fumigation on pollen from two Fraser fir populations was examined. Populations were located at Mt. Rogers, Va, and Mt. Mitchell, S.C.. Two age groups "young" (less then 30 years old) and "old" (more then 40 years old) were examined within each population. No …
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Can and do Ericas self pollinate?
… and autogamous self-pollination. Additionally pollen tube analyses were performed on seven Erica species, which were collected from the Constantia Mountain. In E. plukenetii, self-incompatibility seems to be the predominant breeding system. It appears that, like E. urna-viridis, most of the …
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Testing the Role of Cyclic Nucleotides in Regulating Ion Channels Essential to Pollen Fertility
… in plants. cNMP presence in growing A.thaliana pollen tubes was visualized using fluorescent biosensors, and a competitive binding assay was designed to gauge CNGC binding affinity for cNMPs. cAMP- and cGMP- specific biosensors showed strong, uniform fluorescence throughout pollen tube; the …
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Applications of RAPD Markers in Soybean: Genetic Diversity and Linkage Analysis
To determine the efficacy of the pollen tube pathway transformation procedure plasmids carrying the bar and gus genes were applied to cut stigmas. Approximately 5000 seeds were produced from treated flowers. No plants derived from seeds produced by flowers treated with the plasmid carrying the bar …
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Elucidation and Characterization of Glycosyltransferases Implicated in Pectic Polysaccharide Biosynthesis in Arabidopsis thaliana
… (OFT1) gene resulted in decreased pollen tube penetration through the stigma-style interface. Here, we demonstrate that second site mutations of Arabidopsis GALACTURONOSYLTRANSFERASE14 (GAUT14) and GALACTURONOSYLTRANSFERASE-LIKE4 (GATL4) effectively suppress the phenotype of oft1 …
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Influence of climate changes on cross allergies: possible involvement of pollen transglutaminase
… and hazelnut allergens have been identified in pollens or fruits. Allergic cross-reactivity can occur in a patient reacting to similar allergens from different origins, justifying the research in both systems as in Europe a greater number of people suffers from apple fruit allergy, but little …
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Breeding systems and pistil structure in the family proteaceae / Merran Lisa Matthews.
… in the style were highlighted as filters to pollen tube passage. Comparative studies with other angiosperm species confirmed the unusual structure of the pistil of the proteaceous flower. Seed germination was found to be promoted by exposure of seeds to controlled temperatures of 15C.
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The reproductive biology of Clematis addisonii
… that this species is protogynous. <i>In vivo</i> pollen tube growth supports this conclusion. Field observations suggest that the morphological pistillate phase lasts significantly longer than the staminate phase and is sufficient enough in length that cross-pollination is likely to occur during …
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Investigation of multiple interspecific reproductive barriers in Solanum section Lycopersicon
… clade, postmating prezygotic barriers regulating pollen tube growth in pistils are known to be important for preventing hybridization. Interspecific pollen rejection frequently displays the SI x SC rule, in which crosses between self-incompatible (SI) species and self-compatible species (SC) are …
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SELF-INCOMPATIBILITY IN CHEIRANTHUS ALLIONII
… indicated by a stigmatic barrier to incompatible pollen tube growth, seen in scanning electron micrographs, and by differences in reciprocal cross-compatibilities. Strength of the SI system varied, but no completely self-compatible plants were found. Marked segregation for SI level within self- …
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Evaluating Application Timing Strategies, Suitability, and Efficacy of Apple Blossom Thinning Chemicals for Commercial Use
… were utilized in 2019 to compare between pollen tube growth model-guided blossom thinning sprays and those that are based on fixed time intervals between the initial application and subsequent thinning sprays. It was generally found that model-guided blossom thinning sprays and sprays …
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Pollination Ecology, Self-incompatibility and Genetic Diversity in the Herbaceous Eastern North American Spring Ephemeral, Erythronium americanum
… and hand pollinations were performed to examine pollen limitation and self-incompatibility. Novel molecular markers were developed and used to quantify genetic diversity, clonal diversity, and population structure. Hand pollination treatments (natural, hand supplemented and bagged flowers) showed …
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Identification of a mitogen-activated protein kinase, p56, which mediates the self-incompatibility response in Papaver rhoeas L.
… system that inhibits the growth of incompatible pollen, whereas compatible pollen from an unrelated plant of the same species is able to grow and effect fertilization. In Papaver rhoeas, inhibition of incompatible pollen is mediated by a signal transduction pathway that activates a complex …
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Amplified fragment length polymorphism (AFLP) analysis of genetic variability in Phalaenopsis
… stress treatments during pollination and early pollen tube growth.
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Reproductive biology and ex situ conservation of the genus Restrepia (Orchidaeae)
… (SI) was confirmed by the study of pollen tube growth which further confirmed the time interval between pollination and fertilisation. A time line from pollination/fertilisation to flowering was established. The type of SI in operation was best explained by gametophytic …
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Genetic studies of phenotypic variants in the woodland strawberry, (Fragaria vesca)
… abnormalities in seed set and germination, pollen tube growth, adhesion of the abaxial epidermal layer to the mesophyll layer and reduced petiolule length. These phenotypes are consistent with actin binding and microtubule associated protein mutants in other plant species. Insertional …
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Variation in breeding systems and consequences for reproductive traits in Erica
… in selfing ability, this includes differences in pollen-ovule (P/O) ratios. However, indices suggest the resprouting form of E. mammosa to have an increased ability to self-fertilize while the seeder form has an increased ability for autonomous selfing. The 29 species analysed were divided into …
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