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Dissertations / Theses on the topic 'Genetic variability marker-assisted selection'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Soattin, Marica. "The use of molecular markers for analyzing genes and genomes of livestock." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425494.

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The present thesis has been developed considering three different livestock species such as chicken, cattle and sheep. The aim of the study was the evaluation of the application of molecular makers in order to assay the genetic population structure on seven local breeds of chicken, to evaluate the applicability of candidate genes as support of conventional breeding on Piedmontese cattle breed and to detect new SNPs on a sheep population. The first two researchs were carried out at Department of Animal Science of University of Padova while the last one at Reprogen (Faculty of Veterinary Science

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2

PINHEIRO, Letícia da Silveira. "Determinação da variabilidade genética nas populações de seleção recorrente de arroz CNA-IRAT 4 e CNA 12 utilizando marcadores microssatélites." Universidade Federal de Goiás, 2008. http://repositorio.bc.ufg.br/tede/handle/tde/2661.

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Made available in DSpace on 2014-07-29T16:24:17Z (GMT). No. of bitstreams: 1 Dissertacao Leticia da Silveira Pinheiro.pdf: 1061417 bytes, checksum: d3b6dccd4e5c363bd8b7c9da2c672cc0 (MD5) Previous issue date: 2008-03-07<br>Recurrent Selection is a population inbreed method that is not traditionally used in autogamous species as rice. However, it is still an interesting methodology to the implementation of recurrent selection populations, due to the possibility of obtaining genotypes with wide genetic base and adequate agronomical traits. It is even more attractive when a great genetic variabi

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3

Harris, Sheila Catherine. "Genetic Marker-Assisted Management of Virginia Sport Fishes." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98505.

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Molecular genetic markers can be used to assess genetic diversity, assign parentage, quantify inbreeding, and demonstrate structuring of populations across a system. Striped Bass Morone saxatilis, and Walleye Sander vitreus, are widely sought gamefishes in the Commonwealth of Virginia. Striped Bass along the Atlantic Coast and within the Roanoke River drainage exhibit low genetic variation. Screening 12 microsatellite DNA markers across the range to define population genetic structure, I found that anadromous populations in the Southeast and the Chesapeake Bay were differentiated from landlock

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4

Ntladi, Solomon Magwadi. "Implementation of marker assisted breeding in triticale." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18035.

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Thesis (MScAgric)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Research into markers for the detection of genetic diversity and cultivar identification has become an important component of the genetic improvement of crops. However, the incorporation of marker assisted selection (MAS) as a tool for the identification and characterization of breeding material has not been fully implemented in the breeding of spring triticale at Stellenbosch University’s Plant Breeding laboratory (SU-PBL). The present study served as a case study in order to achieve this. The first part of the study

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5

Bitalo, Daphne Nyachaki. "Implementation of molecular markers for triticale cultivar identification and marker-assisted selection." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71670.

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Thesis (MSc)--Stellenbosch University, 2012.<br>Triticale is an amphidiploid that consists of wheat (A and B) and rye (R) genomes. This cereal is fast becoming important on a commercial basis and warrants further assessment for the better management and breeding of the hybrid. The assessment of the genetic diversity among the wheat and rye genomes within triticale can be obtained by using molecular markers developed in both donor genomes. Simple sequence repeats markers (SSRs) and amplified fragment length markers (AFLPs) have been previously used to assess the genetic diversity among tritical

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6

Ito(Fukino), Nobuko. "Construction of a genetic linkage map and its application to marker-assisted selection in Cucumis." Kyoto University, 2010. http://hdl.handle.net/2433/120499.

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7

Khan, Mohd Golam Quader. "Marker-assisted selection in enhancing genetically male Nile tilapia (Oreochromis niloticus L.) production." Thesis, University of Stirling, 2011. http://hdl.handle.net/1893/2980.

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All-male fry are preferred to prevent uncontrolled reproduction before harvest in intensive Nile tilapia (Oreochromis niloticus) aquaculture. Males also grow faster than females. An alternative approach to direct hormonal masculinisation of tilapia fry is to produce fry that are genetically male. However, sex determination system in tilapia is fairly complex. Recent developments have resulted in a linkage map and genetic markers that can be used to analyse the sex determination system. To analyse the genetic sex determination mechanism and to develop marker-assisted selection in the Stirling N

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8

Sirizzotti, A. "GENETIC INVESTIGATION OF FUSARIUM RESISTANCE IN CORN." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/150042.

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Fusarium related mycotoxins represent an issue in maize cultivation in many world areas, including Italy. The proven toxicity of this class of metabolites induced the major health organization to emanate rules for limiting their presence in human food and animal feed. There are several known physiological mechanisms involved in resistance but little knowledge is available about the genetic bases of this resistance. Aim of the work was the investigation of the genetic base of the resistance to Fusarium. The visual selection against the presence of the pathogen is an effective method to reduce

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9

Asea, Godfrey Rox. "Genetic characterization of partial resistance and comparative strategies for improvement of host-resistance to multiple foliar pathogens of maize." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133833939.

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10

Gill, Jennifer. "Assessment of genetic markers for the improvement of beef quality and consistency." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4711.

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The overall aim of this thesis was to investigate the genetic control of beef quality in a commercial population of Aberdeen Angus-sired cattle with a view to trait improvement. The population studied included 500 Angus-cross animals, all with purebred Aberdeen Angus sires, from a selection of farms throughout Scotland. A number of carcass-related weight traits and taste panel assessed sensory traits were measured on these animals. A population of 265 Charolais cross cattle (all with purebred sires) was then used to explore the extrapolation of results across breeds. The first aim of this thes

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11

Bernal, Eduardo. "Development of tomato (S. lycopersicum) lines with resistance to Xanthomonas spp. and use of genetic resources to characterize infection and diversity in pathogen populations." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595524724989212.

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12

Wright, Emily Elizabeth. "Identification of Native FHB Resistance QTL in the SRW Wheat Cultivar Jamestown." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64327.

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Fusarium Head Blight (FHB) is a devastating fungal disease of wheat (Triticum aestivum L.) and results in significant economic losses due to reductions in grain yield and the accumulation of mycotoxins, such as deoxynivalenol (DON) and nivalenol (NIV). As a result, breeding programs have been working to identify resistance genes in wheat varieties known to be resistant to FHB. Some of the major quantitative trait loci (QTL) for FHB resistance identified to date have been from exotic sources such as 'Sumai3' and the Chinese landrace Wangshuibai, and native resistance has been identified in Nor

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13

Coaker, Gitta Laurel. "Genetic and biochemical characterization of resistance to bacterial canker of tomato caused by Clavibacter michiganensis subsp. michiganensis." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1069188955.

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14

Sikes, Tiffany Rochelle. "Validation of Loci Conferring Adult Plant Resistance to Powdery Mildew in Wheat Cultivar Massey and Identification of Diagnostic Molecular Markers." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64152.

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Powdery mildew, caused by the pathogen Blumeria graminis (DC) Speer (Syn. Erysiphe graminis DC) f. sp. tritici, is a major disease of wheat (Triticum aestivum L.). Race-specific resistance is easily identified in the field due to its qualitative phenotype and it is easy to incorporate because it is inherited as a single gene. Unfortunately, this type of resistance is easily overcome by the pathogen. Traits associated with quantitative trait loci (QTL) such as adult-plant resistance (APR), have become popular with plant breeders because of their durability over a wide geographic range and ti

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15

Meier, Nicholas Alan. "Investigation of winter wheat sowing date management and genetic architecture of malting quality in winter barley and milling/baking performance in soft red winter wheat." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96604.

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Wheat (Triticum aestivum, L) and barley (Hordeum vulgare) are widely grown as winter annual grains in a double crop rotation with soybean (Glycine max, L. Merr.) in much of the U.S. Improved management strategies and the development cultivars that meet the quality requirements of higher value end-use markets is important to increase production and profitability of winter annual grains and the double crop rotation in the Eastern U.S. In Chapter I, fifteen commercially relevant winter wheat genotypes ranging in maturity were sown in a split-plot design (sowing date=main plot, genotype=subplot) a

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16

Sabadin, Priscilla Karen. "Mapeamento de QTL's e base genética da correlação entre caracteres em uma população de milho tropical." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-11072008-163229/.

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Os caracteres quantitativos normalmente têm elevada importância agronômica e econômica, sendo geralmente os mais importantes nos programas de melhoramento das mais diversas espécies, como é o caso do milho (Zea mays L.). Dentre os vários caracteres considerados, destaca-se a produção de grãos e seus componentes. Dessa forma, o objeto de estudo do presente trabalho foi mapear QTL´s relacionados à vários caracteres de importância agronômica, estimar seus efeitos genéticos e entender as causas da correlação genética (pleiotropia ou ligação), em uma população de milho tropical. Para tanto, foi uti

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17

Jung, Hyungtaek. "Transcriptomics approaches to identify genes and markers for production traits in giant freshwater prawn Macrobrachium rosenbergii." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/60883/1/Hyungtaek_Jung_Thesis.pdf.

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This study used next generation sequencing technologies to investigate growth in a cultured crustacean. The objective was to identify and characterise specific gene loci that contribute important phenotypic variation to growth as well as to develop a large set of SNP markers in candidate genes for assessing correlations between specific mutations and individual growth performance. The genomic dataset generated provides a fundamental resource for application in future crustacean stock improvement programs. Ultimately, the data can be applied to development of culture lines with improved growth

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18

Vijayalakshmi, Kolluru. "Physiological and genetic analyses of post-anthesis heat tolerance in winter wheat (Triticum aestivum L.)." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/300.

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19

Alvares, Renata Cristina. "Escurecimento de grãos em feijão: parâmetros genéticos e fenotípicos, associação com tempo de cocção, seleção assistida por marcadores e obtenção de linhagens elite." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/9096.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2018-11-27T11:35:22Z No. of bitstreams: 2 Tese - Renata Cristina Alvares - 2015.pdf: 6545735 bytes, checksum: 57eee901abeda481f65a8b76157955fc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-11-27T12:04:54Z (GMT) No. of bitstreams: 2 Tese - Renata Cristina Alvares - 2015.pdf: 6545735 bytes, checksum: 57eee901abeda481f65a8b76157955fc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available in

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20

Wessels, Elsabet. "Ontwikkeling van ’n koringkwekery met gestapelde, spesie-verhaalde roesweerstand." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5459.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2010.<br>Includes bibliography.<br>ENGLISH ABSTRACT: Wheat rust is a significant contributor to the total impact of diseases on sustainable wheat production. Genetic resistance, produced by using resistance genes from wheat and other related wild species, is the simplest and most cost-effective way to guard against these diseases. The pyramiding of resistance genes in a single line is a vital practice in bringing about durable resistance. This study aimed to develop a series of doubled haploid (DH) wheat lines containing combination's of wi

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21

Tsehay, Fitsum. "Untersuchung zur Gestaltung von Zuchtprogrammen in der Legehennenzucht." Doctoral thesis, [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/tsehay.

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22

Santana, Fernanda Abreu. "Seleção assistida e diversidade genética de fontes de resistência ao nematóide de cisto da soja." Universidade Federal de Viçosa, 2008. http://locus.ufv.br/handle/123456789/4687.

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Made available in DSpace on 2015-03-26T13:42:06Z (GMT). No. of bitstreams: 1 texto completo.pdf: 240857 bytes, checksum: 3f9c86d66de4b1f6bcf6c09ccae2d966 (MD5) Previous issue date: 2008-02-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Due to difficulties in the performance of the phenotypic selection for the resistance to the soybean cyst nematode (NCS), the need to implant the marker-assisted selection to this pathogen, and the little knowledge about the genetic diversity of the resistant cultivars developed by the Brazilian breeding programs, the objectives of this w

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23

Keildson, Sarah. "Computer simulation of marker-assisted selection utilizing linkage disequilibrium." 2006. http://hdl.handle.net/10413/5528.

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The face of animal breeding has changed significantly over the past few decades. Traditionally, the genetic improvement of both plant and animal species focussed on the selective breeding of individuals with superior phenotypes, with no precise knowledge of the genes controlling the traits under selection. Over the past few decades, however, advances in molecular genetics have led to the identification of genetic markers associated with genes controlling economically important traits, which has enabled breeders to enhance the genetic improvement of breeding stock through linkage disequilibrium

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24

Fazio, Gennaro. "Comparative study of marker-assisted and phenotypic selection and genetic analysis of yield components in cucumber." 2001. http://www.library.wisc.edu/databases/connect/dissertations.html.

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25

"Genetic characterization of the acetohydroxyacid synthase (AHAS) gene responsible for imidazolinone resistance in chickpea (Cicer arietinum L.)." Thesis, 2013. http://hdl.handle.net/10388/ETD-2013-12-1343.

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Weed control in chickpea (Cicer arietinum L.) is challenging because of poor crop competition ability and limited herbicide options. Development of chickpea varieties with resistance to different herbicide modes of action would be desirable. Resistance to imidazolinone (IMI) herbicides in chickpea has been previously identified, but the genetic inheritance and the mechanism were unknown. In many plant species, IMI resistance is caused by point mutation(s) in the acetohydroxyacid synthase (AHAS) gene resulting in an amino acid substitution. This changes the enzyme configuration at the herbicide

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26

Mehtre, S. P. "Genetic diversity analysis, QTL mapping and marker-assisted selection for shoot fly resistance in sorghum [Sorghum bicolor (L,) Moench]." Thesis, 2006. http://oar.icrisat.org/6620/1/63766.pdf.

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The present investigation entitled. "Genetic diversity analysis, QTL mapping and marker-assisted selectiocl for shoot fly resistance in sorgllum [Sorghl~rrr hicolor (L.) Moench]" was aimed, 1) to assess genetic dhersity by SSR markers in a set of insect resistant lines. 2) to understand tlie genetics of tlie shoot fly resistance and locnte the chromosomal regions harboring the quantitative trait loci (QTLs) for shoot fly resistance and related component traits. and 3) introgression of shoot fly resistance co~nponents traits in agronomically superior genotypes using ~nolecular markerassis

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27

Mafu, Nothando Fowiza. "Marker-assisted selection for maize streak virus resistance and concomitant conventional selection for Downy Mildew resistance in a maize population." Thesis, 2013. http://hdl.handle.net/10413/10023.

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Maize streak virus (MSV) disease, transmitted by leafhoppers (Cicadulina mbila, Naude), and maize downy mildew (DM) disease caused by Peronosclerospora sorghi (Weston and Uppal) Shaw, are major contributing factors to low maize yields in Africa. These two diseases threaten maize production in Mozambique, thus the importance of breeding Mozambican maize varieties that carry resistance to these diseases. Marker-assisted selection (MAS) was employed to pyramid MSV and DM disease resistant genes into a single genetic background through simultaneous selection. Firstly, it was essential to determine

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28

Chutimanitsakun, Yada. "From the Oregon Wolfe Barley to fall-sown food barley : markers, maps, marker-assisted selection and quantitative trait loci." Thesis, 2011. http://hdl.handle.net/1957/26225.

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Understanding complex traits is a fundamental challenge in plant genetics and a prerequisite for molecular breeding. Tools for trait dissection are markers, maps, and quantitative trait locus (QTL) analysis. Marker-assisted selection (MAS) is an application that integrates these tools. In this thesis research, a new sequence-based marker was evaluated, maps were constructed and used, and QTLs were detected using two types of populations. Marker-assisted selection was used to develop a novel class of barley. Restriction-site Associated DNA (RAD), a sequence based-marker technology, allows for s

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29

Welna, Gregor Christian. "Genetische Analysen für eine markergestützte Verbesserung der Trockenstresstoleranz von Winterackerbohnen." Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5F43-2.

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In dieser Arbeit zu genetischen Analysen für die Vorbereitung eine markergestützten Selek-tion auf Trockenstresstoleranz bei der Winterackerbohne wurden 196 Winterackerbohnen-Inzuchtlinien und vier Sommerackerbohnen-Inzuchtlinien genotypisiert. Diese Inzuchtlinien wurden außerdem hinsichtlich der Physiologie-Merkmale Spad-Wert, Membranstabilitäts-index, Blattwassergehalt, Gesamtgehalt löslicher Zucker sowie Prolin- und Glycinbetainge-halt in je einer Kontroll- und einer Stressbehandlung phänotypisiert. Anhand eines Verifika-tionssatzes von 40 der 196 Winterackerbohnen-Inzuchtlinien wurden korr

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