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Påverkar variationer i promotorn till VRN1 frostresistens i vete (Triticum aestivum) från Nordeuropa?
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology.
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesisAlternative title
Do variations in the promotor of VRN1 affect frost resistance in wheat from Northern Europe? (English)
Abstract [sv]

Vete, Triticum aestivum är en mycket viktig matgröda. Under historiens gång har arten fått anpassa sig till många vitt skilda miljöer. I Nordeuropa har frost-resistens varit extra viktigt. En viktig gen för frostresistensen är VRN1som kontrollerar vernaliseringen d.v.s. övergången från vegetativt till aktivt tillstånd som sker på våren. Olika varianter av denna gen leder till skillnader frostresistens under våren. I detta arbete undersöktes hur variationer i promotorn till VRN1A i accessioner från norra Europa påverkar frostresistensen. Alla sorter som kunde sekvenseras visade sig ha samma promotor trots varierande frost-resistens. Detta kan bero på att promotorn till VRN1 inte är det enda som påverkar genens utryck. Även variationer i intron1 är betydelsefulla och det är därför rimligt att variationen mellan sorterna ligger där istället. En annan förklaring kan även vara att variationen ligger på ett annat genom då T. aestivum är hexaploid. Att alla sorter har samma promotorsekvens kan också tyda på ett selektivt svep. Detta selektiva svep har i så fall förekommit innan vete kom till Nordeuropa då även de franska och tyska sorterna har samma promotor som de finska och svenska.

Abstract [en]

Bread wheat, Triticum aestivum is an important crop. As history has progressed the species has been forced to adapt to different environments. In Northern Europe, frost resistance has been especially paramount. An important gene for frost resistance is VRN1 that controls vernalization, i.e. the transition from vegetative state to active state during spring. Different variants of this gene confer differences in frost resistance during spring. In this study I examined how the promotor region of VRN1A affects frost resistance in accessions of landraces of wheat from Northern Europe. All accessions from which the promotor region could be sequenced shared the same promotor sequence even though they had very varied frost resistance. This could be because the expression of VRN1 is not only affected by the promotor. Variations in intron one is also important, and so it is reasonable to assume that the variation between these landraces lies there instead. The variations could also be on one of the other genomes, because bread wheat is hexaploid. The fact that all the accessions shared the same promotor sequence indicates that a selective sweep has taken place. This selective sweep could have occurred before bread wheat arrived in Northern Europe because landraces from Germany and France shares the same promotor as Nordic Landraces.

Place, publisher, year, edition, pages
2013. , 15 p.
Keyword [sv]
frostresistens, FR-1, Promotorsekvens, Triticum aestivum, Vernalisering
National Category
Genetics
Identifiers
URN: urn:nbn:se:liu:diva-95557ISRN: LiTH-IFM- Ex--13/2812--SEOAI: oai:DiVA.org:liu-95557DiVA: diva2:636038
Subject / course
Chemical Biology
Presentation
2013-05-30, BL32, LIU Hus B, Linköping, 15:40 (Swedish)
Supervisors
Examiners
Available from: 2013-09-03 Created: 2013-07-08 Last updated: 2013-09-03Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • nn-NB
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