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 238 for “"Agriculture, Plant Pathology"”.
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Maize Transformation for Resistance to Aspergillus Flavus
… were found in embryos of the glu transgenic plants. No CH18 protein could be detected in leaves, stems, and roots of young ch18 transgenic seedlings by Western blots. Thus it appears that the globulin1 promoter is seed-specific and not embryo-specific. Mature kernels of line R4 (with glu), …
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Belowground Carbon Budget and Nutrient Uptake of Temperate Forest Species in Response to Elevated Carbon Dioxide and Temperature
A large proportion of carbon in forest ecosystems is lost from belowground through root respiration. Maintenance respiration of attached fine roots was measured on mature loblolly pine and sweetgum (Liquidambar styraciflua ) growing in atmospheric CO2 elevated by 200 mu1 1 -1 above ambient. Fine …
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Cloning and Characterization of Putative Parasitism Genes From the Plant Parasitic Nematode Meloidogyne Javanica
*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Internet Browser; Microsoft Office; Quicktime; Windows MediaPlayer or RealPlayer.
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Characterization of Maize Cytochrome P450s
Messenger RNAs encoded by other maize P450 clones (CYP71C1, CYP51, CYP73A7, CYP73A6, CYP92A1, CYP95A1, and the ESTs 6c06b11 and 7c02c12) were also characterized with regard to their induction response to naphthalic anhydride and triasulfuron treatment. In addition, maize seedlings were also …
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Case Study of a Variant of Western Corn Rootworm, Diabrotica Virgifera Virgifera LeConte, in East Central Illinois
… applying soil insecticides prophylactically at planting. In fact, findings from this research might enable growers to reduce the use of soil insecticides. These findings also could open new avenues for managing this important pest. What role dose phenological asynchrony of corn and soybean …
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Transgenic Insecticidal Corn and Coleomegilla Maculata
… and prey that had consumed insect-resistant plants, and examined the population responses and feeding behaviors of C. maculata and Harmonia axyridis under field conditions. We found that corn pollen from different hybrids is nutritionally variable, and certain critical nutrients for C. …
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Metabolite Profiling of Leaves and Vascular Exudates in Soybean Grown Under Free-Air Concentration Enrichment
Exudate metabolomics combined with leaf biochemistry provided novel information and an understanding on inflow and outflow of metabolites in the leaves for a better explanation of source-sink relationships. It is hoped that the results will facilitate the phenotyping of C3 species allowing for the …
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Identification and Characterization of a Tolerant Response in Arabidopsis Thaliana to Tobacco Ringspot Virus and Cloning of a Single Locus That Confers Tolerance
The TTR1 locus was mapped using the progeny of crosses of Col-0 and Estland. In the initial mapping, PCR-based short sequence length polymorphism and cleaved amplified polymorphic sequence markers located across the A. thaliana genome were scored on 31 F$\sb3$ families to determine the chromosome …
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Genetic Analysis of the Resistance of Soybean Genotypes to Sclerotinia Sclerotiorum
… stem rot in crosses between S19--90 and plant introductions (PIs) 358.318A, 391.589B, and 561.353; and (iv) identify molecular markers associated with field resistance in a cross between S19--90 and Williams 82. Sixty-eight PIs had sclerotinia stem rot resistance levels equal to or better …
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Resistance to Fusarium Solani F. Sp. Glycines, the Causal Organism of Sudden Death Syndrome of Soybean
Finally, the inheritance of resistance was studied in a population from a MR G. sofa line (PI 522.211 A) and susceptible cv. Spencer. The frequency distribution of the F4 family means based on foliar disease severity ratings resembled a normal distribution and the distribution of means of SIDS …
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Investigations Into the Genetic Basis of Resistance to Brown Stem Rot in Soybean
These studies examine the inheritance of brown stem rot (BSR) resistance in soybean [Glycine max (L.) Merr.], caused by a soil-borne fungal pathogen Phialophora gregata f. sp. sojae. Three known BSR resistance genes or quantitative trait loci (QTL) have all been mapped together on linkage group …
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Association Between SCN Resistance and Yield in Soybean, And, QTL Mapping of Field Resistance to Sclerotinia Sclerotiorum in Soybean
Confirmation and refinement of results from both studies will enable soybean breeders to use marker-assisted breeding for the development of SCN resistant cultivars with higher yield potential and the development of soybean cultivars with increased levels of resistance to Sclerotinia stem rot.
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Soybean Mosaic Virus Hc-Pro Enhances Viral Symptoms, Bean Pod Mottle Virus and Transgene RNA Stability, siRNA Accumulation, and Reduces Soybean Seed Production
The interactions between plant viruses and their hosts are constantly evolving. When plants produce a defense system against viral infection, viruses develop means to overcome this host response. Soybean [Glycine max (L.) Merr.] plants infected with Bean pod mottle virus (BPMV) alone develop acute …
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Resistance of Soybean [Glycine Max (L.) Merr.] to Fusarium Solani F. Sp. Glycines: Causal Agent of Sudden Death Syndrome
The objective of my third study was to detect QTL conferring SDS resistance in two populations of recombinant inbred lines (RILs) populations. These populations were from the crosses PI 567374 x 'Omaha' and 'Ina' x LN91-1695. Six chromosomal regions were significantly associated with SDS resistance …
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The Relative Efficiency of Replicates in Sweet Corn Hybrid Disease Nurseries and Posterior Probabilities as a Measure of Confidence in Assigning Sweet Corn Hybrids to Disease Reaction Categories
The objectives of this research are to use Monte Carlo methods to determine the effect of replicate number on the absolute and relative ability of disease nurseries to classify hybrids into reaction categories and to calculate posterior probabilities with Bayes' theorem as a measure of confidence …
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Wheat Take-All: Quantification of Resistance and Pseudomonad Suppression and the Potential for Their Interaction
A new 10-day in vitro assay was developed to study the dynamic colonization of Ggt-infected roots by both antagonistic and non-antagonistic bacteria. Pseudomonas fluorescens (strain 2-79), as antagonist of Ggt and Bacillus megaterium (strain B153-2-2), a non-antagonist, were used to determine if …
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Field Infection Studies on Common Smut of Sweet Corn
… for resistance to stalk and tassel galls. Plants were inoculated by stalk injection and silk channel injection. Incidence of ears with galls was not correlated with severity of stalk and tassel galls. Two thousand Zea mays accessions were screened by stalk and seedling injection. Three …
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Molecular Genetic Characterization of the Mating Pair Formation and Vegetative Replication Regions on the Agrobacterium Tumefaciens Ti Plasmid pTiC58
Conjugal transfer of pTiC58 requires the tra region and an undefined region located at the 2-o'clock position of this plasmid. This region, now called trb, and the adjacent vegetative replication (rep) region have been the focus of this dissertation research. Nucleotide sequence analysis of the …
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Introgression of the Genes for Sesquiterpene Carboxylic Acid Synthesis From a Wild Tomato, Lycopersicon Hirsutum, Into the Cultivated Tomato for Increased Host -Plant Resistance to Insect Pests
… SCA levels and the DNA combined of individual plants within the phenotypic classes. Bulk segregant analysis was used to identify polymorphic AFLP markers present in LA 1777 and absent in 'Chico III' and LA 1033. Comparisons of these polymorphic AFLP markers between high-SCA bulks and the …
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