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Genetic basis for correlated variation in circadian rhythm and flowering time in the tetraploid weed Capsella bursa-pastoris (Brassicaceae)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Functional Genomics.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Functional Genomics.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Functional Genomics.
(English)Manuscript (preprint) (Other academic)
Identifiers
URN: urn:nbn:se:uu:diva-119232OAI: oai:DiVA.org:uu-119232DiVA: diva2:299928
Available from: 2010-02-24 Created: 2010-02-24 Last updated: 2010-02-24
In thesis
1. Studies on Natural Variation and Evolution of Photoperiodism in Plants
Open this publication in new window or tab >>Studies on Natural Variation and Evolution of Photoperiodism in Plants
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Photoperiodism refers to the organism’s ability to detect and respond to seasonal changes in the daily duration of light and dark and thus constitutes one of the most significant and complex examples of the interaction between the organism and its environment. This thesis attempts to describe the prevalence of variation in a photoperiodic response, its adaptive value, and its putative genetic basis in a common cruciferous weed, Capsella bursa-pastoris (Brassicaceae). Furthermore, the thesis presents a first comprehensive comparative overview of the circadian clock mechanism in an early land plant, Physcomitrella patens (Bryophyta), thus providing insights into the evolution of the plant circadian system.

In an introductory survey of global gene expression changes among early- and late flowering accessions of C. bursa-pastoris we found an enrichment of genes involved in photoperiodic response and regulation of the circadian clock. Secondly, by phenotyping circadian rhythm variation in a worldwide sample of accessions with known flowering time, we detected robust latitudinal clines in flowering time and circadian period length, which constitute strong indications of local adaptation to photoperiod in the shaping of flowering time variation in this species. In an attempt to elucidate putative genetic causes for the correlated variation between circadian rhythm and flowering time, we found that sequence variation and diverged expression in components regulating light input to the clock, PHYTOCHROME B (PHYB) and DE-ETIOLATED 1 (DET1) make them strong candidate genes. Finally, we present a comparative study of circadian network topology in the moss P. patens. Phylogenetic analyses and time series expression studies of putative clock homologues indicated that several core clock genes present in vascular plants appeared to be lacking in the moss. Consequently, while the clock mechanism in higher plants constitutes at least a three-loop system of interacting components, the moss clock appears to comprise only a single loop.

We conclude that C. bursa-pastoris is a highly suitable model system for the further elucidation of the molecular variation that influences adaptive change in natural plant populations. Furthermore, we believe that the continuing study of the seemingly less complex circadian network of P. patens not only can provide insights into the evolution of the plant circadian system, but also may help to clarify some of the remaining issues of the circadian clock mechanism in higher plants.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 37 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 718
Keyword
photoperiodism, circadian, flowering time, natural variation, evolution, Caspella bursa-pastoris, Physcomitrella patens
Research subject
Biology with specialization in Evolutionary Functional Genomics
Identifiers
urn:nbn:se:uu:diva-119269 (URN)978-91-554-7730-1 (ISBN)
Public defence
2010-04-09, Zootissalen, Evolutionsbiologiskt centrum (EBC), Villavägen 9, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2010-03-17 Created: 2010-02-24 Last updated: 2010-03-17Bibliographically approved

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