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Characterization And Management Of Auxin-Resistant Palmer Amaranth In Tennessee, Delaney C. Foster
Characterization And Management Of Auxin-Resistant Palmer Amaranth In Tennessee, Delaney C. Foster
Doctoral Dissertations
Palmer amaranth has a long history of evolving resistance to herbicides to the point it has become a significant row crop production obstacle. Cotton and soybean growers were offered new technologies in 2016, expanding in-crop herbicide options to include dicamba or 2,4-D. Within three years of commercialization, dicamba use in these crops increased ten-fold and growers began to report Palmer amaranth escapes in west Tennessee auxin-tolerant production systems. A survey of Palmer amaranth escapes in dicamba and 2,4-D-tolerant cotton and soybean fields in Tennessee was conducted in the fall of 2021 with the objective of determining if poor control was …
Functional Analysis Of Soybean Proteinase Inhibitor Genes And Cyst Nematode-Inducible Synthetic Promoters For Insects And Nematode-Resistance In Plants, Mst Shamira Sultana
Functional Analysis Of Soybean Proteinase Inhibitor Genes And Cyst Nematode-Inducible Synthetic Promoters For Insects And Nematode-Resistance In Plants, Mst Shamira Sultana
Doctoral Dissertations
Proteinase inhibitors (PIs) from legumes have the potential for use as protectants in response to pests and pathogens. Soybean (Glycine max) contains two trypsin inhibitors (TIs): Kunitz trypsin inhibitor (KTI) and Bowman-Birk inhibitor (BBI). In this study, the possible role of soybean TIs in plant defense against insects and nematodes was investigated. In addition to the three known TIs (KTI1, KTI2 and KTI3), novel inhibitors KTI5, KTI7, and BBI5 were identified in soybean. Their functional role was further examined by overexpression in soybean and Arabidopsis. In vitro enzyme inhibitory assays showed significant increase in trypsin and chymotrypsin inhibitory …
Fungicide Sensitivity Screening Of Corynespora Cassiicola In Us Soybean And Cotton, Tyler Miles Smith
Fungicide Sensitivity Screening Of Corynespora Cassiicola In Us Soybean And Cotton, Tyler Miles Smith
Doctoral Dissertations
Target spot, caused by the fungus Corynespora cassiicola, is a foliar disease of cotton and soybean. Target spot has become a disease of concern in soybean and cotton production systems. Data for fungicide sensitivity and understanding potential impact on yield is lacking for C. cassiicola. Fungicide resistance is also a concern in C. cassiicola with the increase in resistant pathogens in soybean. With the lack of knowledge about baseline fungicide sensitivity and the concern of fungicide resistance the objectives of this study were: (i) to evaluate fungicide products and mixes in small plot soybean and cotton trials, (ii) …
Mapping And Identification Of Qtl Associated With Soybean Seed Protein, Oil, And Yield In 5601t × U99-310255 Ril Population Using Snp Genotyping, Mia Justina Cunicelli
Mapping And Identification Of Qtl Associated With Soybean Seed Protein, Oil, And Yield In 5601t × U99-310255 Ril Population Using Snp Genotyping, Mia Justina Cunicelli
Doctoral Dissertations
Soybean [Glycine max (L.) Merr.] is the world’s leading source of vegetable oil and high quality protein meal. However, soybean protein and oil and protein and yield are negatively genetically correlated. Agronomic and seed quality traits of soybean lines are important because they lead to increased soybean value. Molecular markers have played and will continue to play a major role in the genetic characterization and improvement of soybeans. Quantitative trait loci (QTL) are regions within a genome that contain genes that influence particular quantitative traits. Identification of QTLs through phenotypic evaluation only is not possible; therefore, to locate, identify, and …
Understanding Soybean Root Microbiome Assembly Along Its Development From Both Plant And Soil Perspectives, Fang Liu
Doctoral Dissertations
Plants have evolved intimate partnerships with microorganisms to compensate for their sessile nature and to respond to changing biotic and abiotic environmental conditions. The plant-associated microbiome greatly expands plant functions and plasticity via improved nutrient availability/uptake, enhancing plant abiotic stress tolerance, and promoting plant defense. Understanding plant microbiome assembly is crucial for leveraging their versatile benefits to the plant host and advancing the next green movement in sustainable agriculture. In this study, we comprehensively characterized soybean root-associated microbiome assembly via the 16S rRNA gene and ITS2 (internal transcribed spacer) region amplicon sequencing. Using this technology, we examined different factors influencing …
Global Dna Methylation Changes In Soybean As A Response To Soybean Cyst Nematode (Scn) Infection., Aditi Rambani
Global Dna Methylation Changes In Soybean As A Response To Soybean Cyst Nematode (Scn) Infection., Aditi Rambani
Doctoral Dissertations
Soybean cyst nematode (SCN, Heterodera glycines) is the most damaging pest in soybean production worldwide. The compatible interaction of SCN with susceptible soybean plants is mediated by differential expression of thousands of genes in the infected root cells, leading to the formation of a functional feeding site, the syncytium. During an incompatible interaction of SCN with resistant soybean, the developing syncytium degenerates leading to nematode death. The resistance to SCN in soybean is derived from two major loci, Rhg1 and Rhg4. In this study, the role of genome-wide DNA methylation in regulating gene expression during the compatible interaction was …
Molecular Breeding Strategies For Improvement Of Complex Traits In Soybean, Christopher Joseph Smallwood
Molecular Breeding Strategies For Improvement Of Complex Traits In Soybean, Christopher Joseph Smallwood
Doctoral Dissertations
Soybean [Glycine max (L.) Merrill] is the leading oilseed crop grown in the world. Yield, fatty acids, protein, and oil are commercially important soybean traits; thus evaluation of breeding strategies for improvement of these traits is merited. To accomplish this, a comparison of molecular and phenotypic breeding strategies from progeny row selections was performed. From this it was determined that molecular strategies consistently outperformed phenotypic selections (PS) in the progeny row stage for soybean yield, fatty acids, protein, and oil. For yield, Epistacy was the preferred selection method. For fatty acids, protein, and oil, the genomic selection (GS) strategies were …
Effects Of Leaflet Orientation And Root Morphology On Physiological Traits And Yield In Soybeans., Richard Dewayne Johnson
Effects Of Leaflet Orientation And Root Morphology On Physiological Traits And Yield In Soybeans., Richard Dewayne Johnson
Doctoral Dissertations
Drought is the most important abiotic stress adversely affecting soybean (Glycine max (L.) Merr.) yield. Leaflet orientation has been shown to reduce leaflet temperatures and transpiration while root morphology has been related to slower wilting phenotypes. The objective of this study was to investigate effects of leaflet orientation and rooting morphology on whole plant transpiration, yield, water use efficiency, and other physiological traits in soybeans using grafting techniques, population lines, near-isogenic lines, and restrained leaf canopy experiments. Experiments were conducted in Knoxville, TN with additional yield trial plots at Springfield, Spring Hill, and Milan, TN. Data were collected on …