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 15 of 15 for “"Plant Introductions"”.
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Plant introductions and community dynamics across environmental gradients in Great Lakes coastal wetlands
… various threats, including invasion by nonnative plants. Within coastal wetlands, the uppermost edge of the herbaceous wetland is a dynamic transitional zone influenced by lake level fluctuations and the adjacent upland; this zone may serve as a refugium for herbaceous emergent vegetation species …
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Examination of the inheritance of resistance to Phytophthora megasperma var. sojae in two soybean plant introductions
Call number: LD2668 .T4 1978 K55
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Use of digital image analysis to identify <i>Rhizoctonia solani</i> and <i>Rhizoctonia zeae</i> resistance in <i>Festuca arundinacea</i> plant introductions
… disease and to use DIA to screen tall fescue plant introductions (PIs) for resistance to <i>R. solani</i> and <i>R. zeae</i>. There was a strong correlation (r<sup>2</sup> = 0.97) between actual disease severity, measured by applying lesioned tissue of a known area to healthy leaves, and DIA …
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AN ELECTROPHORETIC ANALYSIS OF THE GENETIC VARIATION IN THE WILD AND CULTIVATED SOYBEAN GERMPLASM
… soybean (Glycine max (L.) Merr.) cultivars and plant introductions and more than 100 wild soybean (Glycine soja Sieb & Zucc.) plant introductions from a wide geographic distribution were examined by polyacrylamide, slab electrophoresis for genetic variation in 15 enzymes. Allozymes for 25 loci …
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Propagation of Vallisneria Americana (MICHX): Vegetation Management In South Carolina Piedmont Reservoirs
<p>Aquatic plant communities in reservoirs can support biological and chemical processes that are typical of those found in more natural settings which may benefit reservoir managers and users through the associated enhancements that aquatic plants can bring to reservoir purposes. Reservoirs are …
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Genetic Studies on Lipoxygenase and Some Other Factors Possibly Associated With Soybean Oil Stability
Two soybean accessions, plant introductions (P.I.) 133226 from Indonesia and P.I. 408251 of the U.S. Department of Agriculture germplasm collection, were found to lack lipoxygenase-1 (linoleate: O(,2) oxidoreductase, EC 1.13.11.12). Spectrophotometric assays, measurement of oxygen uptake, …
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Enhancing Economic and Environmental Value in Soybean Production through Value-Added Innovation
… First, we evaluated 218 diverse soybean plant introductions across multiple environments, revealing significant genotype-by-environment interactions affecting fatty acid profiles. A metabolite-based genome-wide association study identified 20 single nucleotide polymorphisms (SNPs) …
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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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Characterization of cytoplasmic diversity in soybean (Glycine max L. Merr) using mitochondrial markers
… Modem cultivars are derived from relatively few plant introductions (PIs) which severely limits diversity in soybean germplasm. The United States Department of Agriculture (USDA) maintains the soybean germplasm collection. Mitochondrial DNA sequences have been used as markers of diversity at the …
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Detection of viable urediniospores, morphological characterization in resistant and susceptible genotypes, and germ tube anastomosis of Phakopsora pachyrhizi
… cultivar UG5 conferred complete resistance, and plant introductions 567102B and 224268, which were classified as having incomplete resistance, had extensive necrosis of the mesophyll cells. These results, in combination with fungal DNA concentrations, are the first detailed evidence of …
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Restriction fragment length polymorphism mapping of quantitative and qualitative traits in soybean
… max experimental line A81-356022 and the G. soja Plant Introduction 468916. Each F[subscript]2 was genotyped with 252 marker loci. Markers that explained significant (Pr < 0.01) variation were found for all traits. Many of the markers significantly associated with variation for the seed traits …
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Confirming QTL for seed yield from exotic soybean germplasm
… base, has resulted in a very narrow gene pool. Plant introductions (PI) have been used to expand the N.A. genetic base with limited success when conventional breeding methods have been used. Quantitative trait loci (QTL) mapping has been used to identify genetic regions within PIs that could …
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Identification of phytotoxins produced by fusarium virguliforme associated with foliar symptoms of sudden death syndrome and genome-wide association studies for soybean disease resistance
"Plant pathology is a multidisciplinary subject and the scientific progress in plant pathology follows the advent of sciences. Beginning in the 1800s, the father of plant pathology, Dr. Anton de Bary, initiated studies on the identification of oomycetes and fungal plant pathogens. This was the …
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Soybean disease research on green stem disorder, effects of seed treatments on Sclerotinia stem rot, and resistance to Cercospora leaf blight
Soybean plants often exhibit varying delayed maturity symptoms at the end of the growing season. One delayed maturity malady known as green stem disorder (GSD) is the occurrence of non-senescent, fleshy green stems at harvest maturity with normal, fully mature pods and seeds. Data on GSD incidence …
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Genomic and genetic resource for soybean disease resistance improvement
… application of Chromium linked-reads in diploid plant genome de novo assembly. With the growing knowledge of the vital regulatory role of miRNAs in gene expression over the past two decades, there has been great interest to identify both conserved and novel miRNAs in response to environmental …