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 23 for “"Root hair"”.
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REGULATION OF CALCIUM INFLUX AND REACTIVE OXYGEN SPECIES PRODUCTION DURING INFECTION OF LEGUMES BY RHIZOBIA
… induce two separate calcium responses in legume root hairs. Nuclear-associated calcium spiking is central to the symbiosis signalling (Sym) pathway, which is necessary for the activation of genes required for nodule formation and bacterial infection. In addition NF activates a tip-focused calcium …
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The analysis of Metarhizium robertsii potential as endophytic plant root coloniser, plant growth enhancer and antagonist to bean root pathogen Fusarium solani f. sp. phaseolis.
… Metarhizium robertsii also colonizes plant roots endophytically, thus showing potential as a plant symbiont. M robertsii is not randomly distributed in soils but preferentially associates with the plant rhizosphere when applied in agricultural settings. Root surface and endophytic …
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Investigating the effect of mutations in lipopolysaccharides (LPS) (O-antigen and Core region) of Salmonella Typhimurium on the colonisation of “microgreens”
… Extracts from nine different microgreens root and leaf samples infected by S. Typhimurium ATCC 14028 were plated on Xylose Lysine Deoxycholate (XLD) agar to quantify bacterial proliferation and attachment. These results demonstrated that S. Typhimurium ATCC 14028 successfully colonised the …
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Roots adhesion processes in the Mediterranean seagrass Posidonia oceanica
This doctoral thesis investigates root and root hair adhesion in Posidonia oceanica seedlings and its relevance for restoration. This endemic Mediterranean seagrass delivers key ecosystem services, including carbon sequestration, sediment stabilization, and biodiversity support, yet its meadows …
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Phosphate starvation alters calcium signalling in roots of Arabidopsis thaliana
… ([Ca2+]cyt), in stress signalling by P-starved roots of the model plant Arabidopsis thaliana. The hypothesis was that under P starvation and a resulting decreased cellular P pool, the use of [Ca2+]cyt may have to be restricted to avoid cytotoxic complexation of Ca2+ with limited P groups. …
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Phosphorous uptake and utilization efficiency in cluster root and non-cluster root forming species of the Core Cape Subregion, South Africa
… to enhance P-acquisition, such as increased root surface area (SA) and specific root length (SRL), cluster root and root hair proliferation and exudation of organic acids and acid phosphatases (APase) from the roots. Crop yield is limited worldwide due to the unavailability of P and …
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Characterization of a plant-specific membrane-tethered myb transcription factor in Arabidopsis thaliana
… identified in protein lysates extracted from root tissue. Furthermore, through mutagenesis studies, it was shown that this cleavage is dependent upon the integrity of the TMD region and therefore occurs as a result of specific proteolytic activity. The third aim was to identify the functional …
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Assessing the role of probiotics for the enhancement of soil quality under cover crops
… Probiotics are believed to improve plant growth, root development and production of plant growth promoting substances. The main objective of this study was to quantify the effects of SCD Probiotics (Bio-Ag) on soil quality (SQ; microbial biomass, microbial communities, enzymatic activity) in …
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Tissue-Specific Influence on Developmental Modulation in Response to Phosphate Deprivation in Arabidopsis thaliana Roots
<p>Roots are developmentally plastic and highly dependent on the immediate environment. By studying root responses to abiotic stress, we have identified novel regulators of developmental modulation. When roots are deprived of phosphate (Pi), developmental programs are modulated to slow primary root …
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Beyond membrane curvature: Clade 6 reticulons and their role within the plant endoplasmic reticulum
… proteins mediating cisternae formation, and ROOT HAIR DEFECTIVE 3 (RHD3/Atlastin/Sey1p) which is required for 3-way junction formation. The differential expression of these proteins induces changes in ER morphology, and morphological dysregulation has been associated with disruptions in …
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Early land plant origins of the MYB-bHLH-WDR complex
… patterns of flavonoid pigments, trichomes and root hairs in this cell layer. We reasoned that investigating the origins and diversification of the MBW complexes may give insights into the origins of these cell types. Phylogenetic analysis and interrogation of the conservation of implicated …
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Analysis of gene expression, regulation and function of three symbiotic ABC subfamily-B transporters in Medicago truncatula
… nitrogen-fixing soil bacteria called rhizobia (Root Nodule Symbiosis) and fungi which assist in the acquisition of phosphate, collectively called arbuscular mycorrhizae (Arbuscular Mycorrhizal Symbiosis). Establishment of functional beneficial symbioses requires successful microbial infection. …
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Studies of E2s Related to Unconventional Ubiquitination in Arabidopsis thaliana
… ubc13 mutant plants display strong phenotypes in root development. In this study, a family of six E3s that can interact with UBC13 were identified, and when a subgroup of three genes were inactivated, the T-DNA mutants showed a glucose-sensitive phenotype suggesting their possible role in sugar …
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The structure and dynamics of the plant endoplasmic reticulum
… in maintaining or modifying plant ER structure: root hair defective 3 (RHD3) a proposed ER fusogen, and the reticulon protein family which mediates ER membrane curvature. Here we introduce a new family of ER shaping proteins: the Lunapark protein family, comprised of AtLNP1 and 2. AtLNP1 …
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Regulation of nitrate uptake and calcium signaling in arabidopsis
… A unique calcium signature was identified in root epidermal cells and root hair cell-specific responses were captured in response to low NO3-. Two potential transcriptional regulators (TFs) were identified through gene regulatory network analysis of NO3--responsive time-series datasets, DIV1 …
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Influence of Penicillium simplicissimum (Oud.) Thom and Penicillium citrinum Thom on growth, chemical composition and root exudation of axenic marigold
… plant containers, designed for collecting root exudates, inside sterile gnotobiotic flexible plastic isolators. Plant roots were treated with washed conidiospores of Penicillium simplicissimum (Oud.) Thom (7 to 8 x 10⁶ per plant) or Penicillium citrinum Thom (4 x 10⁶ conidiospores per …
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Influence of Trichoderma Harzianum Rifai on growth, chemical compositions and root exudation of axenic tobacco
… Rifai by introducing conidia into the rooting medium at a concentration of 1.08 X 10<sup>6</sup> to 1.44 X 10<sup>6</sup> conidia per plant. Experiments were harvested 35 days and 123 days after inoculation. Growth measurements were made, shoot and root tissue dried for 48 hours at 75 C …
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Identification and analysis of genes involved in cotton fibre initiation.
Cotton fibres are single-celled hairs, arising from the epidermal surface of the cotton ovule. One factor in determining the length of the mature cotton fibre is the timing of fibre initiation, which is therefore a crucial step in obtaining commercial cotton fibres. To achieve a greater …
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Deciphering the contribution of root hairs in barley to the structure and function of the rhizosphere bacterial microbiota
… of soil surrounding and influenced by plant roots, termed the rhizosphere, defines a distinct and selective microhabitat compared to that of the surrounding soil: the bulk soil. The microbial populations that reside in the rhizosphere, commonly referred to as the rhizosphere microbiota, …
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Root responses to soil physical conditions and the role of root-particle contact
This thesis considers the elongation o f root and shoots in relation to matric potential and soil strength in contrasting species. The role of root-particle contact for root and shoot elongation in relation to particle/aggregate size and bulk density at various matric potentials is …
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