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Genome-wide association mapping for disease resistance and fruit quality traits in Nordic association mapping panel of garden strawberry

Show simple item record 2022-06-17T05:25:40Z 2022-06-17T05:25:40Z 2022-06-17
dc.title Genome-wide association mapping for disease resistance and fruit quality traits in Nordic association mapping panel of garden strawberry en
ethesis.faculty Maatalous-metsätieteellinen tiedekunta fi
ethesis.faculty Faculty of Agriculture and Forestry en
ethesis.faculty Agrikultur- och forstvetenskapliga fakulteten sv
ethesis.faculty.URI Helsingin yliopisto fi University of Helsinki en Helsingfors universitet sv
dct.creator Omran, Mohammad
dct.issued 2022
dct.abstract Strawberry breeding in Finland began 60 years ago and has largely relied on traditional breeding methods. The geography of Finland, as well as local consumer preferences for darker-coloured strawberries, have been the main focus of selection in all implemented Finnish breeding programs. With several successful and popular cultivars have been released, the current focus is on increasing yield and disease resistance while maintaining the excellent fruit quality of breeders' selections. A panel of 175 garden strawberry accessions was created and trialled at the Natural Resources Institute Finland (Luke) as part of a Nordic-Baltic pre-breeding collaboration between the institute and the Norwegian breeding company Graminor AS. A medium-density, genome-wide scan for 50K SNPs has been performed on each individual of the panel. This panel represents the genetic diversity present and typical for cultivated strawberry in the Nordic-Baltic region, and it is expected to provide Nordic breeders with markers tailored to their plant material diversity, supporting their future selection decisions and accelerating their breeding cycles. In this study, symptom severities of two strawberry leaf diseases (leaf spot caused by Mycosphaerella fragariae and leaf scorch caused by Diplocarpon earlianum) and seven fruit quality traits (berry weight, skin colour, flesh colour, evenness of flesh colour, basket appearance, predominant berry shape and tip type) were scored in the panel. GAPIT and statgenGWAS statistical packages in R were used to run five different GWAS models: Significant SNP-trait associations were found using single-locus (GLM and MLM) and multi-locus (FarmCPU and BLINK) association mapping analyses. The study had shed a light on the importance of considering several statistical models and parameters for a maximum benefit of association mapping studies. Among significant SNP-trait associations for fruit weight, fruit skin colour and fruit flesh colour, four were partially characterized by inspecting their allelic effects. On chromosome Fvb6-1, appearance of consensus, significant signals from the flesh colour trait of secondary-position berries is discussed. Nine significant SNP-marker associations were detected for berry weight. en
dct.subject Garden strawberry
dct.subject Fragaria x ananassa
dct.subject berry weight
dct.subject fruit skin colour
dct.subject fruit flesh colour
dct.subject fruit quality traits
dct.subject strawberry diseases
dct.subject Mycosphaerella fragariae
dct.subject Diplocarpon earlianum
dct.subject statistical models in GWAS
dct.subject association mapping
ethesis.language englanti fi
ethesis.language English en
ethesis.language engelska sv
ethesis.supervisor Tuuli Haikonen, Karisto Petteri, Ismo Strandén and Teemu Teeri und
ethesis.thesistype pro gradu -tutkielmat fi
ethesis.thesistype master's thesis en
ethesis.thesistype pro gradu-avhandlingar sv
dct.identifier.ethesis E-thesisID:80231c3a-89b1-45f0-b0fe-89137cd3825f
ethesis-internal.timestamp.reviewStep 2022-05-16 11:50:53:989
ethesis.principalprofessor Teemu Teeri und
dct.identifier.urn URN:NBN:fi:hulib-202206172822
ethesis.facultystudyline Kasvintuotantotieteet fi
ethesis.facultystudyline Plant production sciences en
ethesis.facultystudyline Växtproduktionsvetenskap sv
ethesis.mastersdegreeprogram Erasmus-Mundus Master's Programme in Plant Breeding (EMPLANT) fi
ethesis.mastersdegreeprogram Erasmus-Mundus Master's Programme in Plant Breeding (EMPLANT) en
ethesis.mastersdegreeprogram Erasmus-Mundus Master's Programme in Plant Breeding (EMPLANT) sv

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