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 30 for “"leaf senescence"”.
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Biochemical basis for differential leaf senescence of two maize hybrids
Senescence, the deteriorative process that ultimately leads to the death of an organism, was examined by ear removal treatment on two maize hybrids (B73 x Mo17 and Farm Service brand 854) which are known to have different rates of natural- and ear-removal-induced leaf senescence. Changes in …
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"The Regulation of Pheophorbide a Oxygenase (Pao) in the ""Green Seed"" Problem in Canola and During Leaf Senescence"
… in the leaves all increased dramatically during senescence but by different amounts. As was observed during seed development, the increase in PaO activity during leaf senescence was greater than could be explained by the increase in protein level. It was shown that PaO is phosphorylated and that …
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Identification and Characterization of Physiological Traits Related to Productivity of Maize (Multiple Regression, Leaf Senescence, Inheritance, Green Score)
… the relationship between visual assessment of leaf senescence following ear removal and leaf green score ratings of eared plants at physiological maturity; and (d) determine the inheritance of leaf senescence following ear removal.
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Molecular insights into arabidopsis response to Myzus persicae sulzer (green peach aphid)
… have demonstrated an important role of premature leaf senescence in controlling aphid growth in Arabidopsis. Molecular and physiological studies suggest that the Arabidopsis PAD4 (PHYTOALEXIN DEFICIENT 4) gene modulates the GPA feeding-induced senescence process. Furthermore, in comparison to the …
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Computational analysis of upstream regulatory elements regulating plant chlorophyll degradation
… canola seeds. The second hypothesis was that the leaf senescence process will alter the normal expression profiles of upstream regulatory elements, leading to modulation of PAO expression that ultimately will stimulate chlorophyll degradation. Third, it was hypothesized that drought will affect …
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Unraveling the ORE1 regulon in Arabidopsis thaliana : molecular and functional characterization of up- and down-stream components
Leaf senescence is an active process required for plant survival, and it is flexibly controlled, allowing plant adaptation to environmental conditions. Although senescence is largely an age-dependent process, it can be triggered by environmental signals and stresses. Leaf senescence coordinates the …
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Physiological and nutritional changes in nitrogen fixing trees associated with autumnal senescence and chilling
In the first of two studies, autumnal leaf senescence of four temperate woody deciduous plants, autumn olive (Elaeagnus umbellata Thunb.), black locust (Robinia pseudoacadia L.), American sycamore (Platanus occidentalis L.) and honey locust (Gleditsia triacanthos L.), was studied during the autumns …
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Functional analysis of Poplar genes regulating flowering and vegetative growth
… observed that AmiSND2 transgenics showed delayed leaf senescence and leaf drop. After conducting controlled environment studies with AmiSND2 trees, I was able to confirm that downregulation of PopNAC154 and PopNAC156 genes does not alter the short daylength-induced bud set and growth cessation but …
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Biology and biocontrol potential of Taphrocerus schaefferi Nicolay and Weiss (Coleoptera, Buprestidae), a leaf miner attacking yellow nutsedge (Cyperus esculentus L.)
<u>Taphrocerus schaefferi</u> is a leaf miner of yellow nutsedge, a serious weed of many agronomic and horticultural crops. Beetles begin egg-laying in early June; the eggs have an incubation period of 16 days. There are three larval instars, the first two of which consume only the chlorenchyma and …
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The effect of early season soil temperatures on corn canopy development: A quantitative approach
Corn leaf area and the geometry of the canopy determine the percentage of solar radiation intercepted. Early season soil temperatures have been reported to affect corn ontogeny. A two year field experiment was conducted to evaluate the growth and developmental characteristics of corn under …
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The NAM-B1 transcription factor and the control of grain composition in wheat
… micronutrient content and accelerates monocarpic senescence, often without imposing a yield penalty. The aim of this thesis was to understand the mechanisms by which NAM-B1 influences nutrient remobilisation and monocarpic senescence to cause these effects. To achieve this I have examined the …
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The Residential Urban Forest: Linking structure, function and management
… plant traits--height potential at maturity and leaf senescence-- selected based on their sensitivity to management decisions and for their role in controlling ecological functions (e.g., carbon cycling). Suburban parcels had more trees than those in the urban area. However, after accounting for …
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A proteomic investigation of the rhizomes of the resurrection fern Mohria caffrorum L. (Desv.) in response to desiccation
… biological processes and pathways that relate to leaf senescence, shoot system morphogenesis and gametophyte development, among others.
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GENETIC MANIPULATION OF CYTOKININ LEVELS IN NEW PLANT TYPE RICE
The changes in chlorophyll content, rate of senescence and cytokinin (CK) levels in the top three leaves of field-grown New Plant Type (NPT) rice were determined during the grain filling period. The chlorophyll content in the leaves decreased from flowering to maturity. Fast-senescing and …
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Tail-anchored Triphosphate Tunnel Metalloenzymes in Arabidopsis thaliana: An Investigation into the Molecular Mechanisms underlying their Biological Functions
… of programmed cell death (PCD), dark-induced senescence and immunity, respectively. It was concluded that this functional differentiation was governed by their transcriptional regulation. In this thesis, I show that the knockout mutant of TTM1 (ttm1) also displays delayed natural and …
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Burkholderia phytofirmans strain PsJN effects on drought resistance, physiological responses and growth of switchgrass
… to PsJN inoculation by tracking growth and leaf physiology. In a third experiments, we tested the effects of PsJN on growth and leaf-level physiology of switchgrass under a moderate pre-drought conditioning and a successive severe drought stress. PsJN inoculation increased biomass and …
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Physiological, Metabolic, and Transcriptional Analysis of Submergence Tolerance in Rice and Nitrogen Use Efficiency in Wheat
… to the restriction of elongation growth and leaf senescence in the sink tissues. Application of nitrogen fertilizers is a necessary step to maintain high grain yield in cereals, but plants absorb only 30-50% of supplied N. Wheat, one of the most widely grown crops in the world, requires a …
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The relationship between the nutrient status and flammability of forest fuels
… However, flammability generally increases at leaf senescence and litter fall, during which substantial amounts of nitrogen, phosphorus, and potassium are withdrawn and calcium is accumulated. A number of characteristics of the eucalypt forest contribute to its considerable flammability. 'These …
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The relationship between the nutrient status and flammability of forest fuels
… However, flammability generally increases at leaf senescence and litter fall, during which substantial amounts of nitrogen, phosphorus, and potassium are withdrawn and calcium is accumulated. A number of characteristics of the eucalypt forest contribute to its considerable flammability. 'These …
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Nitrogen and carbon costs of growth and antioxidant production during acclimation to environmental stress in two species of gethyllis
… phases: a winter (cold and wet) growing phase, leaf senescence phase towards spring, flowering phase during the hot and dry summer months, and fruit and leaf formation phase in autumn. The medicinal uses of this genus (including G. multifolia “Kukumakranka” and G.villosa “hairy kukumakranka”) …
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