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 “"Root hairs"”.
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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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Roles and Interplay of Flavonoids, Reactive Oxygen Species, and Cytokinin in the Early Infection of Medicago truncatula by Sinorhizobium meliloti
… of symbiotic infection of rhizobia in the roots of the model legume Medicago truncatula. Infection of Medicago roots is driven by the production of 'infection threads' by the plant. Infection threads are infection structures that are unique to nitrogen-fixing symbioses, and critical to our …
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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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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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Quantifying soil reinforcement by fibrous roots
Reinforcement of soil by fibrous roots is crucial for preventing soil erosion and degradation,yet the underlying mechanisms are poorly understood. Without fully understanding root enmeshment within the soil matrix, and root biomechanical properties key for increasing soil shear strength, adoption …
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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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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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Identification of the Polar Flagellum Genes in Azospirillum brasilense
… fixing rhizobacterium, can colonize plant roots and increase the yield of economically important cereals, such as rice and grasses. This organism has a mixed pattern of flagellation: a single polar flagellum for motility in liquid medium and lateral flagella which might be involved 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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Establishment and regulation of polar growth in Streptomyces
… cells grow polarly. From neuronal dendrites and root hairs to bud emergence and elongation of yeast, broadly conserved pathways control cell polarity in eukaryotes. In contrast, virtually nothing is known about the regulatory mechanisms controlling polar cell growth in prokaryotes. In …
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Concentration dependency, mode of action and characterization of compounds involved in alfalfa autotoxicity
… crops. Incorporation of fresh alfalfa residue--roots only or roots and shoots both--reduced alfalfa emergence, plant height and dry weight. Primary effect of water-soluble inhibitory compounds from alfalfa shoot appeared to be on germination and radicle elongation, the latter being more …
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Heathland Restoration after Mineral Extraction
… presence of ErM fungi in the order Heliotales on root hairs of plants grown in the ErM treated soil. Chemical analyses of topsoil stored in soil berms for up to five years identified some changes, in particular, downward movement of some chemical elements. While the soil remained suitable for …
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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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Untersuchungen zu Regulatoren der Flavonoidbiosynthese in Arabidopsis thaliana : eine Studie zu neuen Funktionen bekannter Proteinklassen
… of the cell identity of trichomes and root hairs has been shown for several R3-MYBs. In this work a negatively regulating effect of the R3-MYB protein MYBL2 on the activation of the DFR gene, which is involved in anthocyanin formation, has been shown. This is the first known example of …
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Studies on aluminum toxicity in an aluminum-sensitive cultivar of barley: impact on ion fluxes and calcium distribution
The effects of aluminum (Al) on root growth and development in the aluminum-sensitive cultivar of barley, Hordeum vulgare Lemend. Lam. var. Kearney was studied using low (1 AM) and high concentrations (50 AM) of Al. To analyze the impact of the aluminum treatments, changes in the anatomy, …
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Interactions between mycophagous nematodes, mycorrhizal and other soil fungi
… mycorrhizal (VAM) infection in plant roots and the growth response of plants to this infection was investigated in experiments carried out under controlled environmental conditions. Preliminary experiments indicated that nematodes might be able to reduce VAM infection by Glomus clarum …
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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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Quantification and functional characterization of Sinorhizobium meliloti chemotaxis proteins
… cells must actively travel to the plant's roots and successfully induce formation of a plant organ called a root nodule. To initiate the nodulation process, the bacterium needs to be in direct contact with the root hairs. This requires free living bacterial cells within the soil to sense …
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The nature of host plant recruitment by the sensory repertoire of Sinorhizobium meliloti
… or as a differentiated bacteroid inside root nodules of the legume genera Medicago, Melilotus, and Trigonella. It exists in symbiosis when inside a host plant and will fix gaseous N2 into ammonium for the plant. In return, a population of the bacteria is harbored inside the plant where it …