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 17 of 17 for “"haustoria"”.
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Comparative analysis of membrane-associated signatures at mutualistic and pathogenic plant-microbe interfaces
… mycorrhizal (AM) fungi and the digit-like haustoria formed by the pathogenic oomycete Phytophthora palmivora. Both haustoria and arbuscules are surrounded by specialised plant interface membranes. My thesis identifies protein and lipid signatures of these interface membranes and explores …
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Exploring host-parasitic plant interactions by examining mechanisms of resistance and susceptibility
… plants by using specialized structures called haustoria. These interactions can cause 100% crop losses, yet growers lack control options that are effective and affordable. Host crops with resistance to parasitism would be an ideal solution to the problem, but well-characterized examples of host …
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Transcriptomic studies of the early stages of potato infection by <i>Phytophthora infestans</i>
… clear cell biology evidence of functional haustoria was found. Gene expression analysis of a selection of leaf infection-related genes suggested that effectors are used to promote infection also in host tuber tissue. However, some cytoplasmic RXLR effector proteins such as PITG_05146 and …
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Suppression and triggering of Arabidopsis immunity by Albugo species
… cells we find SSP6-2c localizes around AlNc14 haustoria. We propose that AlNc14 secretes the effectors SSP6-2c and CHXC1 into the plant cell to suppress defense and promote infection. Current methods to screen for virulence of effector candidates predominantly rely on measuring growth of …
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Molecular basis of plant cell death suppression by the phytophthora infestans effector AVR3a
… dynamin accumulates around P. infestans (Pi) haustoria possibly pointing to its role in the plant-Pi interaction.
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Evaluation of Downy Mildew (Peronospora farinosa f.sp. chenopodii) Resistance among Quinoa Genotypes and Investigation of P. farinosa Growth using Scanning Electron Microscopy
… fewer sporangiophores, hyphal strands, and haustoria among leaf tissues of accession 0654 than in the susceptible Chucapaca cultivar. Peronospora farinosa growth was detected in leaf, petiole, and stem tissues with polymerase chain reaction (PCR) using ITSP primers designed from the internal …
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Plasticity of Primary Metabolism in Parasitic Orobanchaceae
… attach to the roots of host plants via haustoria capable of drawing nutrients from host vascular tissue. Species in this family span the spectrum of host nutrient dependency, allowing comparisons that provide insight into parasite adaptation. A key aspect of this is the relationship …
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Investigating the role of downy mildew effectors in host resistance and susceptibility
Through specialised structures called haustoria, filamentous eukaryotic plant pathogens such as rusts and mildews can deliver “effector” proteins directly into plant cells in order to manipulate specific defence responses and processes. Hyaloperonospora arabidopsidis (Hpa) is a haustorium-producing …
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Secretion and delivery of virulence proteins from <i>Phytophthora infestans</i> to its host
… RXAA mutant effector fusions were secreted from haustoria, finger-like structures that form intimate interactions with host cells. Importantly, only wildtype effectors accumulated inside the host cell nuclei, their site of activity. Strikingly, my data demonstrate that the RXLR motif determines …
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Bridging the physiology and ecology of hemiparasitic plants
… host plants using specialized structures called haustoria. All lineages that have evolved away from autotrophy display profound changes in morphological, biochemical, and molecular traits. In addition, the adoption of a parasitic lifestyle necessitates certain physiological adaptations that allow …
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Annotation and comparative analysis of fungal genomes: a hitchhiker's guide to genomics
… accumulation of some candidate effectors in the haustoria and infection hyphae, which is described in Chapter 5.
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Phytophthora parasitica and lupin (Lupinus angustifolius) interactions: changes in gene expression during infection and after phosphite treatment
… root. At 42 hpi, P. parasitica hyphae developed haustoria within root cortical cells. No evidence of callose deposition, a typical plant defence response, by the lupin root cells was observed after infected roots stained with aniline blue. Development of the model lupin-P. parasitica infection …
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Phytophthora parasitica and lupin (Lupinus angustifolius) interactions: changes in gene expression during infection and after phosphite treatment
… root. At 42 hpi, P. parasitica hyphae developed haustoria within root cortical cells. No evidence of callose deposition, a typical plant defence response, by the lupin root cells was observed after infected roots stained with aniline blue. Development of the model lupin-P. parasitica infection …
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Studies on sweet corn: Stewart's wilt forecasting, the effect of maize dwarf mosaic on foliar diseases, and herbicide sensitivity
… affect diseases caused by pathogens which form haustoria or invade the vascular system. The extent to which SCLB severity is increased by MDM in terms of changes in level of host resistance also was determined. For MDM-susceptible hybrids, reactions to SCLB ranged from resistant to …
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Water, mineral nutrient and hormone flows and exchanges in the hemiparasitic association between root hemiparasite Rhinanthus minor and the host Hordeum vulgare
… barley roots even in the direct vicinity of the haustoria. This indicates there are no backward transport of xylem sap from parasite to host. Compared to unparasitised barley, the net biosynthesis and deposition of sucrose in the shoot and the phloem flow was decreased substantially when plants …
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Elucidating essential roles of oomycee effector proteins in immune suppression and in targeting hormonal pathways in the host plant
Effector proteins are exported to the interior of host cells by numerous plant pathogens. Effector proteins have been well characterized in bacteria. However, the mechanisms through which these effectors promote virulence are largely unknown. Bioinformatic analysis of genome sequences from oomycete …
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Development of novel approaches to study Cuscuta campestris biology
… seed production. Using the AHS, we studied haustorial function, determining the role of nutrients and phytohormones on parasite haustorium development and growth, and found genes involved in haustorial function. The AHS allowed us to demonstrate the positive effect of light on C. campestris …