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.
Results
Showing 1 to 20 of 27 for “"pest resistance"”.
-
Genetic engineering for pest resistance in potato (Solanum tuberosum L.)
Insect pests of potato cause significant losses of yields under field and storage conditions. Conventional breeding techniques for targeting genes of interest is usually laborious and time-consuming. An alternative way for targeting genes of interest into the plant genome consists of …
-
Pesticide regulatory actions and the development of pest resistance: a dynamic bioeconomic model
Pest resistance to pesticides can have severe impacts on both commercial agriculture and the environment. But many resistance problems are exacerbated because pest susceptibility is a dynamic, common-property resource subject to inefficient allocation by the market. Theoretically, the impact of …
-
Genetic Engineering of Black Cherry (Prunus serotina) for Reproductive Sterility and Insect Pest Resistance
… the damage caused by cambial-mining insect pests triggers gummosis in black cherry, a non-specific defense response in which resinous gum is deposited at the site of injury. The gum defects dramatically decrease the yield of high-quality black cherry lumber, and the value can be reduced by …
-
The effects of foliar applications of seaweed extracts on plant growth and pest resistance
A commercial extract of kelp, Ascophyllum nodosum (L.) LeJolis, was applied as a foliar spray on third and fourth cutting alfalfa (Medicago sativa L.) in fertilized and nonfertilized plots. Kelp treatments alone had no effect on alfalfa yield and quality, on tissue levels of nitrogen, phosphorus, …
-
Consumers and Benefits of Genetically Modified Vegetables
… biotechnology traits such as increased pest resistance, greater herbicide resistance, and increased yields the growers have accepted them. The next wave of biotech crops have second-generation traits, such as improved nutrient content, extended shelf life, reduced pesticide and herbicide …
-
Inheritance and expression of Cry3Aa and PVY-O coat protein transgenes in diploid and tetraploid potato
… of plant genetic engineering for disease and pest resistance have been widely acknowledged in many studies, and although genetically modified crops are still encountering public wariness, these benefits warrant continued exploration. Because of its intrinsic economic benefits, the development …
-
Bioremediation of arsenic and cadmium in a Populus tremula x Populus alba mutant
… density, an elevated growth rate, enhanced pest resistance and a predicted root phenotype was investigated for its ability to tolerate and accumulate arsenic and cadmium in soil. The chlorophyll, hydrogen peroxide and proline contents of fuzzy tissues were assayed, its tissue metal content …
-
Effects of Local Plant Neighborhood on Plant Herbivory in Perennial Polyculture Cropping Systems
… spacings) that could confer specialist insect pest resistance via reduced host plant apparency, changes in herbivore attraction, and host plant tissue quality. The three chapters in this dissertation examine these themes of perennial polyculture and effects of spatial heterogeneity on insect …
-
Biosynthesis of Steroidal Glycoakaloids in Solanum chacoense Bitter
… family. SGAs are reported to be important for pest resistance and flavor enhancement at low concentrations but are toxic to humans and other mammals at high concentrations. Studies on sterol / SGA biosynthesis have implicated squalene synthase as a key regulatory enzyme because it catalyzes an …
-
The Relationship Between Resistance to the Fungal Toxin Cercosporin and Grey Leaf Spot Disease Resistance in Corn (ZEA MAYS L.)
… corn inbreds were tested for their degree of resistance to the fungal toxin cercosporin. The level of tolerance to cercosporin for each inbred was then compared to the inbred's level of resistance to Grey Leaf Spot. Resistance to cercosporin was determined by measuring the increases in the …
-
Transposon Tagging in Strawberry and Potato and Characterization of Representative Strawberry Mutants
… important genes in this species in improving the pest resistance and improving yield. One approach to characterize gene function in a model system is having large populations of T-DNA insertional or transposon tagged mutants. The idea of using AcDs construct to create transposon tagged mutant …
-
Assessing the synergy between the Sterile Insect Technique and Classical Biological Control for sustainable management of the invasive pest Bagrada hilaris (Hemiptera: Pentatomidae)
… is largely represented by phytophagous insect pests, which are responsible for global economic losses of at least $70 billion annually. The protagonist of this study, Bagrada hilaris (Burmeister) (Hemiptera: Pentatomidae), in addition to being a pest of cruciferous plants in areas where it is …
-
Understanding farmer seed systems in Sespond, North West Province
… The dominant GM maize is that designated for pest resistance using Bacillus thuringienesis (Bt), a soil bacterium which produces a toxin that is fatal to a wide variety of insects such as moths and flies. Many small-scale farmers prefer their own traditional seeds for breeding, planting, …
-
Development and testing of a greenhouse assay for screening potato germplasm for susceptibility to Spongospora subterranea f. sp. subterranea (powdery scab)
Potato resistance to powdery scab, caused by the protist Spongospora subterranea f. sp. subterranea (S.s.s.), has become extremely important in recent years due to the increased damage caused by this disease. Variable field conditions and the environmental sensitivity of the S.s.s. infection …
-
Virus induced gene silencing of <em>Fusarium verticillioides</em> pathogenicity genes in maize
1 PDF file (x, 99 pages)
-
Host-pathogen interactions in a segregating population of BC2F2 hybrid Castanea dentata and other chesnut hybirds after exposure to hypovirus-containing and hypvirus-free strains of Cryphonectria parasitica
… to screen the 4- 7 year old chestnut trees for resistance to chestnut blight disease. Two virus-containing, hypovirulent strains, Ep155(CHV1-Euro7) and Ep155(CHV1-Ep713), were used to investigate interactions of host disease resistance and expression ofhypovirulence. The BC2F2 population varied …
-
Pemanfaatan minyak biji jarak pagar (Jatropha curcas L.) sebagai insektisida nabati terhadap mortalitas larva Spodoptera litura F. (ulat grayak)
… can cause various negative impacts include: pest resistance, resurjensi, the emergence of secondary pests, soil pollution, poisoned user, and poison the host. Jatropha seed oil (J. curcas) contains chemical compounds such as kursin, forbol esters, triglycerides, alkaloid compounds. This …
-
Patogenisitas isolat lokal jamur Metarhizium anisopliae (Metsch) terhadap Helicoverpa armigera hubner
… mengendalikan hama H. armigera menggunakan pestisida kimia. Penggunaan pestisida kimia secara intensif dapat menimbulkan dampak negatif, di antaranya adalah: gejala resistensi dan resurjensi hama, terbunuhnya musuh alami, meningkatnya residu pada hasil panen serta mencemari lingkungan dan …
-
Transgenic Pest Resistant Indica Rice: An Ex-ante Economic Evaluation of an Adoption Impact Pathway in the Philippines and Vietnam for Bt Rice
Research and development of Bt rice in Southeast Asia has been overshadowed by the contentious debate over the potential release of transgenic food crops into the region. The study provides empirical evidence on the potential size and distribution of economic benefits of adopting Bt Indica rice in …
-
Temporal composition of tannin and carbohydrate content in Eucalyptus leaves in South Africa
… component in the forest sector. An insect pest of these Eucalyptus species, Gonipterus scutellatus, causes periodic defoliation in the plantations. Plants have extraordinary array of chemicals (secondary metabolites), which defend them from herbivores. This study reports on the seasonal …
Page 1 of 2