Browsing Doctoral Degrees (Genetics) by Title
Now showing items 22-41 of 59
-
Identification and characterisation of grapevine leafroll-associated virus 3 genomic and subgenomic RNAs
(Stellenbosch : University of Stellenbosch, 2010-12)ENGLISH ABSTRACT: Grapevine leafroll-associated virus 3 (GLRaV-3) is the type strain for the genus Ampelovirus, family Closteroviridae. There has been only one report that claimed the complete nucleotide sequence of ... -
Identification and molecular characterization of three genetic variants of Grapevine leafroll-associated virus 3 (GLRaV-3) from South African vineyards and their spread in local vineyards
(Stellenbosch : University of Stellenbosch, 2011-03)ENGLISH ABSTRACT: Grapevine diseases, in particular virus and virus-like diseases, are threatening grapevine industries worldwide; also in South Africa. Grapevine leafroll (GLR) is one of the most important diseases of ... -
Identification of growth related quantitative Trait Loci within the abalone using comparative microsatellite bulked segregant analysis
(Stellenbosch : Stellenbosch University, 2010-12)ENGLISH ABSTRACT: The South African abalone, Haliotis midae, is a commercially valuable mollusc and is mostly exported to the Far East. Genetics research on H. midae has increased substantially since a genetic improvement ... -
Identification of SNPs associated with robustness and greater reproductive success in the South African merino sheep using SNP chip technology
(Stellenbosch : Stellenbosch University, 2015-04)ENGLISH ABSTRACT: Reproduction and robustness traits are integral in ensuring sustainable, efficient and profitable sheep farming. Increases in genetic gain of reproduction and robustness traits are however, hampered by ... -
In silico and functional analyses of the iron metabolism pathway
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: Iron is an essential micronutrient that is an absolute requirement for correct cellular function in all eukaryotic organisms. However, ferrous iron has the ability to catalyze the formation of potentially ... -
Increasing cellulosic biomass in sugarcane
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: Increased demand of petroleum, declining fossil fuel reserves, geopolitical instability and the environmentally detrimental effects of fossil fuels have stimulated research to search for alternative sources ... -
Investigating the role of Brettanomyces and Dekkera during winemaking
(Stellenbosch : Stellenbosch University, 2008-12)Wine quality is greatly influenced by the number of microorganisms, which occur throughout the winemaking process. These microorganisms are naturally present on the grapes and in the cellar from where they can be introduced ... -
An investigation into the genetic variation of chilling requirement in apple (Malus x domestica Borkh.) progenies
(Stellenbosch : Stellenbosch University, 2002-03)ENGLISH ABSTRACT: Various experiments were undertaken over a period of five years to investigate the feasibility of initiating a large-scale programme of controlled apple breeding and selection for the improvement of ... -
Investigation of the genetic aetiology of Parkinson's disease in South Africa
(Stellenbosch : University of Stellenbosch, 2011-03)ENGLISH ABSTRACT: Parkinson’s disease (PD), a neurodegenerative movement disorder characterized by resting tremors, bradykinesia, postural instability and rigidity, is due to a selective loss of dopaminergic neurons in ... -
The isolation and characterisation of a developmentally-regulated gene from Vitis vinifera L. berries
(Stellenbosch : University of Stellenbosch, 2004-12)ENGLISH ABSTRACT: Despite increased focus on ripening-related gene transcription in grapevine, and the large number of ripening-related cDNAs identified from grapes in recent years, the molecular basis of processes involved ... -
Isolation and characterisation of carotenoid biosynthetic genes from Vitis vinifera
(Stellenbosch : University of Stellenbosch, 2007-03)Plants are constantly exposed to adverse environmental conditions including variations in light intensity and the availability of water resources. These abiotic factors are expected to worsen as the changing global climate ... -
Isolation and characterisation of novel enzymes producing fructo- and galacto-oligosaccharides through a metagenomic approach
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Prebiotic oligosaccharides and polymers are a form of dietary carbohydrate that are selectively fermented by the microbiota of the lower gastro intestinal tract and confer a health benefit to the host ... -
Isolation and evaluation of the sugarcane UDP-glucose dehydrogenase gene and promoter
(Stellenbosch : University of Stellenbosch, 2006-12)The young internodes of sugarcane are ideal targets for altering metabolism, through genetic manipulation, to potentially control known fungal diseases such as Smut or to increase sucrose yields in these regions that are ... -
Manipulation of pyrophosphate fructose 6-phosphate 1-phosphotransferase activity in sugarcane
(Stellenbosch : University of Stellenbosch, 2006-03)The main aim of the work presented in this thesis was to elucidate the apparent role of pyrophosphate fructose 6-phosphate 1-phosphotransferase (PFP) in sucrose accumulation in sugarcane. PFP activity in sugarcane ... -
Mannoprotein production and wine haze reduction by wine yeast strains
(Stellenbosch : Stellenbosch University, 2012-12)ENGLISH ABSTRACT: Wine protein haze formation is a major challenge for wine makers, and several wine clarifying agents such as bentonite are used in the industry to protect wine from this occurrence. However, clarifying ... -
Mapping and restructuring of an Ae. kotschyi derived translocation segment in common wheat
(Stellenbosch : University of Stellenbosch, 2010-12)ENGLISH ABSTRACT: The wild relatives are an important source of new genes for the genetic improvement of wheat. At Stellenbosch University the leaf and stripe rust resistance genes Lr54 and Yr37 were transferred from ... -
Mapping and survey sequencing of Dn resistance genes in Triticum aestivum L.
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT : Diuraphis noxia Kurdjumov (Russian Wheat Aphid; RWA) is a pest of wheat and barley that has spread from its home range in the fertile crescent to most wheat producing countries except Australia. Since ... -
Marker assisted breeding in sugarcane : a complex polyploid
(Stellenbosch : University of Stellenbosch, 2007-03)Association analysis was used to improve the efficiency of breeding sugarcane varieties for the negatively correlated traits of resistance to sugarcane smut and the eldana stalk borer. 275 RFLP and 1056 AFLP markers were ... -
Modulation of ascorbate peroxidase activity by nitric oxide in soybean
(Stellenbosch : Stellenbosch University, 2012-12)Salinity stress is one of the major environmental factors that lead to poor crop yield. This is due to overproduction of reactive oxygen species (ROS) which consequently lead to oxidative stress. Although these ROS may be ... -
Modulation of root nodule antioxidant systems by nitric oxide : prospects for enhancing salinity tolerance in legumes
(Stellenbosch : University of Stellenbosch, 2010-12)ENGLISH ABSTRACT: Salinity is one of the major limiting abiotic stresses on legume plant yield, leading to early senescence of root nodules. This occurs because of accumulation of reactive oxygen species (ROS) in plant ...
