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Elucidating the role of CSK during early light response and chloroplast development
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
2014 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

Elucidating the role of CSK during early light response and chloroplast development

Chloroplasts of higher plants have evolved from endosymbiotic, ancestor of modern prokaryotic cyanobacteria. During evolution most of the genes from the genome of the endosymbiont have moved to the nucleus of it host. As a consequence the components of the photosynthetic machinery are encoded both in the chloroplastic and in the nuclear genomes. Therefore, expression of both genomes must be tightly coordinated to ensure a simultaneous and stoichiometric biosynthesis of the chloroplast components at different developmental stages and under environmental or metabolic changes. This is achieved by a mechanism referred to as retrograde signalling. During retrograde signalling, signals are emitted from the chloroplast consisting on intracellular pathways emitted by the chloroplast communicating the status of the chloroplast and regulating the expression of nuclear genes encoding plastid components. The aim of this project was to elucidate the role of CSK (Chloroplast Sensor Kinase) in relation to previously described retrograde signalling components PRIN2 (Plastid Redox INsensitive 2) and GUN1 (Genomes UNcoupled 1). CSK is a plastid kinase involved in the long- term, acclimation response to balance the ratio between PSII and PSI by regulating the expression of psaA. The activity of CSK is regulated by the redox state of the plastoquinone pool. My work revealed that CSK is up- regulated upon light exposure. In addition, similarly to the prin2 and gun1 mutants, the csk mutant exhibited lower chlorophyll content, a striking yellow cotyledon tip phenotype, impaired chloroplast development and a down- regulation of PEP dependent genes psaA and psbA during a de- etiolation development and for the establishment of PEP activity in light. Furthermore, the similarity in the mutant phenotypes suggests that CSK is involved in the same signalling pathway as PRIN2 and GUN1.

Ort, förlag, år, upplaga, sidor
2014.
Nyckelord [en]
chloroplast, retrograde signalling, de- etiolation, CSK, PRIN2, GUN1, PEP
Nationell ämneskategori
Biokemi och molekylärbiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-94895OAI: oai:DiVA.org:umu-94895DiVA, id: diva2:756807
Utbildningsprogram
Masterprogrammet i växt- och skogsbioteknik
Handledare
Examinatorer
Tillgänglig från: 2014-10-20 Skapad: 2014-10-20 Senast uppdaterad: 2014-10-20Bibliografiskt granskad

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Institutionen för fysiologisk botanikUmeå Plant Science Centre (UPSC)
Biokemi och molekylärbiologi

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