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Articles 31 - 36 of 36
Full-Text Articles in Plant Breeding and Genetics
Examining Vegetative Growth Of Cool-Season Forage Grasses For Dairy Cattle Grazing Preference, Eric D. Billman
Examining Vegetative Growth Of Cool-Season Forage Grasses For Dairy Cattle Grazing Preference, Eric D. Billman
Theses and Dissertations--Plant and Soil Sciences
The objective of this study was to determine dairy cattle preference amongst four species of cool-season forage grasses: eight orchardgrasses (Dactylis glomerata L.), five tall fescues [Schedonorus arundinaceus (Schreb.) Dumort.], five perennial ryegrasses (Lolium perenne L.), and six festuloliums [xFestulolium braunii (K. Richt.) A. Camus.]; 24 cultivars in total. Each grazing trial utilized four Holstein-Friesian heifers over six hours. Maturity differences were eliminated by having animals graze only vegetative material. After six grazing trials (three each in 2014 and 2015), consistent results in animal preference were not found; three of the six trials did show preference …
Breeding For Nitrogen Use Efficiency In Soft Red Winter Wheat, Katlyn Hitz
Breeding For Nitrogen Use Efficiency In Soft Red Winter Wheat, Katlyn Hitz
Theses and Dissertations--Plant and Soil Sciences
Nitrogen use efficient (NUE) wheat varieties have potential to reduce input costs for growers, limit N runoff into water ways, and increase wheat adaptability to warmer environments. Previous studies have done little to explain the genetic basis for NUE and components, nitrogen uptake efficiency (NUpE) and nitrogen utilization efficiency (NUtE). Four studies were conducted to 1) determine genotypic stability of NUE under high and low N regimes and under warming 2) determine effect of warming on NUE 3) indentify QTL associated with NUE components 4) assess the utility of canopy spectral reflectance (CSR) as a high-throughput phenotyping device for NUE. …
Fusarium Head Blight Resistance And Agronomic Performance In Soft Red Winter Wheat Populations, Daniela Sarti Dvorjak
Fusarium Head Blight Resistance And Agronomic Performance In Soft Red Winter Wheat Populations, Daniela Sarti Dvorjak
Theses and Dissertations--Plant and Soil Sciences
Fusarium head blight (FHB), caused by Fusarium graminearum Schwabe [telomorph: Gibberella zeae Schwein.(Petch)], is recognized as one of the most destructive diseases of wheat (Triticum aestivum L. and T. durum L.) and barley (Hordeum vulgare L.) worldwide. Breeding for FHB resistance must be accompanied by selection for desirable agronomic traits. Donor parents with two FHB resistance quantitative trait loci (QTL) Fhb1 (chromosome 3BS) and QFhs.nau-2DL (chromosome 2DL) were crossed to four adapted SRW wheat lines to generate backcross and forward cross progeny. F2 individuals were genotyped and assigned to 4 different groups according to presence/ absence of …
Smp1-3 Insight Into Seed Longevity, Taylor Lloyd
Molecular And Chemical Dissection Of Cellulose Biosynthesis In Plants, Darby M. Harris
Molecular And Chemical Dissection Of Cellulose Biosynthesis In Plants, Darby M. Harris
Theses and Dissertations--Plant and Soil Sciences
Plant cell walls are complex structures that must not only constrain cellular turgor pressure but also allow for structural modification during the dynamic processes of cell division and anisotropic expansion. Cell walls are composed of highly glycosylated proteins and polysaccharides, including pectin, hemicellulose and cellulose. The primary cell wall polysaccharide is cellulose, a polymer composed of high molecular weight !- 1,4-glucan chains. Although cellulose is the most abundant biopolymer on Earth, there is still a lot to learn about its biosynthesis and regulation. This research began by applying a variety of analytical techniques in an attempt to understand differences in …
Evolutionary And Functional Characterization Of Os-Pollux, A Rice Gene Orthologous To A Common Symbiosis Gene In Legume, Cui Fan
University of Kentucky Master's Theses
Root symbioses with arbuscular mycorrhizal fungi and rhizobial bacteria share a common signaling pathway in legumes. Among the common symbiosis genes are CASTOR and POLLUX, the twin homologous genes in Lotus japonicus that encode putative ion channel proteins. Orthologs of CASTOR and POLLUX are ubiquitously present in both legumes and non-legumes, but their function in non-legumes remains to be elucidated. Here, we use reverse genetic approaches to demonstrate that the rice (Oryza sativa) ortholog of POLLUX, namely Os-POLLUX, is indispensible for mycorrhizal symbiosis in rice. Furthermore, we show that Os-POLLUX can restore nodulation, …