Browsing Doctoral Degrees (Genetics) by Title
Now showing items 1-20 of 59
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AFLP and PCR markers for the Ht1, Ht2, Ht3 and Htn1 resistance genes in maize
(Stellenbosch : Stellenbosch University, 2001-12)ENGLISH ABSTRACT: Maize is undoubtedly South Africa's most important field crop. The identification of markers and genes for traits of interest is important to sustain the improvement of maize cultivation. Northern corn ... -
The analysis of starch degradation in Solanaceae species
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: This project involved the analysis of genes in Solanaceae species that have previously been shown to be involved in the phosphorylation of starch or its subsequent dephosphorylation. Both these processes ... -
Characterisation of sucrose synthase activity in the sugarcane culm
(Stellenbosch : University of Stellenbosch, 2004-04)ENGLISH ABSTRACT: This study had three main goals: 1. to investigate the occurrence on the protein level of sucrose synthase (SuSy) isoforms in sugarcane sink tissue, 2. to determine the kinetic properties of these ... -
Characterization of citrus tristeza virus variants and their influence on symptom expression in grapefruit
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: Citrus tristeza virus (CTV), a member of the family Closteroviridae, was responsible for large scale destruction of citrus, especially in the Americas, due to tristeza disease and necessitated a production ... -
The development and characterisation of grapevine virus-based expression vectors
(Stellenbosch : University of Stellenbosch, 2010-03)ENGLISH ABSTRACT: Grapevine (Vitis vinifera L.) is a very important agricultural commodity that needs to be protected. To achieve this several in vivo tools are needed for the study of this crop and the pathogens that ... -
Development of a transformation system for sugarcane (Saccharum spp. hybrids) in South Africa using herbicide resistance as a model system
(Stellenbosch : Stellenbosch University, 2002-12)ENGLISH ABSTRACT: Please refer to fulltext for abstract -
Drought tolerance studies in spring wheat cultivars produced in South Africa
(Stellenbosch : Stellenbosch University, 1999-12)ENGLISH SUMMARY: Drought is considered, worldwide, to be the most important factor limiting crop yields. Spring wheat produced in the Western Cape region of South Africa is also affected by water stress. The onset of ... -
Elucidating functional interactions between the Russian wheat aphid (D. noxia Kurjumov) and bread wheat (Triticum aestivum L.)
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: The Russian wheat aphid (Diuraphis noxia, Kurdj., Hemipetra, Aphididae, RWA) is an important pest of wheat, causing large-scale damage and yield losses. Various studies have been done at a transcriptomics ... -
The evolutionary history of the genus Seriola and the phylogeography and genetic diversity of S. lalandi (yellowtail) across its distribution range
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: The genus Seriola includes several important commercial fish species, yet the phylogenetic relationships between species have not been fully investigated to date. This study reports the first molecular ... -
Functional characterization of a putative signalling peptide TAXIMIN in the model plant Arabidopsis thaliana and a medicinal plant Sutherlandia frutescens L. R. Br.
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Secondary metabolite production in plants assists with protection against predators and attraction of pollinators. Manipulation of secondary metabolite pathways towards increased production of compounds ... -
Functional roles of raffinose family oligosaccharides: Arabidopsis case studies in seed physiology, biotic stress and novel carbohydrate engineering
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The raffinose family of oligosaccharides (RFOs) are α1,6-galactosyl extensions of sucrose (Suc-Galn) unique to the plant kingdom. Their biosynthesis is mediated via α1,6-galactosyltransferases which ... -
Gene discovery and expression analysis in sugarcane leaf and culm
(Stellenbosch : Stellenbosch University, 2002-12)ENGLISH ABSTRACT: Sugarcane (Saccharum spp. hybrids) is a commercial crop plant capable of storing up to 20% sucrose on a fresh mass basis in the culm. Knowledge about gene expression during sugarcane growth and maturation ... -
A genetic analysis of the occurrence of pulmonary haemorrhage in racing thoroughbreds in Southern Africa
(Stellenbosch : Stellenbosch University, 2004-12)ENGLISH ABSTRACT: This study was carried out to investigate whether environmental and/or genetic factors had an effect on the incidence of epistaxis related to exercise-induced pulmonary haemorrhage among racehorses in ... -
Genetic enhancement of pearl millet
(Stellenbosch : Stellenbosch University, 2004-03)ENGLISH ABSTRACT: The aim of this study was toe stablish a reliable protocol for the production 0 f transgenic pearl millet as this will open new avenues for augmenting the gene pool of this crop. This was achieved by ... -
Genetic improvement of growth rate in rainbow trout (Oncorhynchus mykiss)
(Stellenbosch : University of Stellenbosch, 2004-12)ENGLISH ABSTRACT: A breeding programme aimed at the genetic improvement of growth rate of rainbow trout was initiated in 1988 by the Department of Genetics, University of Stellenbosch, in collaboration with the local ... -
Genetic manipulation of sucrose-storing tissue to produce alternative products
(Stellenbosch : University of Stellenbosch, 2007-03)The main aim of the work presented in this dissertation was to explore the possibility to genetically manipulate the sucrose storing crops, sugarcane and sweet sorghum, to convert their sucrose reserves into higher-value ... -
Genetic manipulation of the cell wall composition of sugarcane
(Stellenbosch : University of Stellenbosch, 2007-03)In order to understand and manipulate carbon flux to sucrose one needs to consider not only its biosynthetic pathways, but also the competing sinks for carbon in various parts of the plant and at different stages of ... -
Genetic mapping of adult plant stripe rust resistance in the wheat cultivar Kariega
(Stellenbosch : Stellenbosch University, 2003-04)ENGLISH ABSTRACT: Stripe (yellow) rust of wheat, caused by Puccinia striiformis f.sp. tritici, was first detected as a single introduction into South Africa in 1996. Two additional pathotypes have since been identified. ... -
Genetic mapping of gray leaf spot resistance genes in maize
(Stellenbosch : Stellenbosch University, 2000-12)ENGLISH ABSTRACT: Gray leaf spot (GLS) of maize, caused by the fungus Cercospora zeae-maydis, can reduce grain yields by up to 60% and it is now recognized as one of the most significant yield-limiting diseases of maize ... -
Genome and transcriptome sequencing of vitis vinifera cv pinotage
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Examining the genetic basis of natural phenotypic variation, and the transfer of this knowledge to a breeding program for improved crop cultivars or livestock races, is a major goal for biological ...
