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Evolutionary diversification of the MADS-box gene family; an analysis of nine novel genes from the conifer Norway spruce
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
Manuscript (Other academic)
Identifiers
URN: urn:nbn:se:uu:diva-89836OAI: oai:DiVA.org:uu-89836DiVA: diva2:161641
Available from: 2002-04-29 Created: 2002-04-29 Last updated: 2016-04-25Bibliographically approved
In thesis
1. MADS-Box Gene Phylogeny and the Evolution of Plant Form: Characterisation of a Family of Regulators of Reproductive Development from the Conifer Norway Spruce, Picea abies
Open this publication in new window or tab >>MADS-Box Gene Phylogeny and the Evolution of Plant Form: Characterisation of a Family of Regulators of Reproductive Development from the Conifer Norway Spruce, Picea abies
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The evolutionary relationships between the angiosperm floral organs and the reproductive organs of other seed plants is not known. Flower organ development requires transcription factors encoded by the MADS-box genes. Since the evolution of novel morphology likely involve changes in developmental regulators, I have analysed MADS-box genes from the conifer Norway spruce, Picea abies, a representative of the gymnosperm group of seed plants.

The results show that the MADS-box gene family has evolved via gene duplications and subsequent diversifications in correlation in time with the evolution of morphological novelties along the seed-plant lineage.

Angiosperm MADS-box genes that determine petal and stamen development have homologues in the conifers, that are specifically active in pollen cones. It is, therefore, likely that the common ancestor of these genes controlled the development of the pollen-bearing organs in the early seed plants, and later were recruited for petal development in the angiosperms.

Norway spruce set cones at an age of 15-20 years. One of the spruce MADS-box genes analysed may have a function in the control of the transition to reproductive phase, supported by expression data and the effect of the gene on development of transgenic Arabidopsis plants.

Two of the spruce genes identified are not closely related to any known angiosperm gene. These may have roles in gymnosperm-specific developmental processes, possibly in the patterning of the conifer cones, as suggested by their expression patterns.

The molecular regulation of cone- and flower development in fundamental aspects is highly conserved between conifers and angiosperms, however, differences detected may be informative regarding the origin of morphological complexity.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 46 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 718
Keyword
Plant physiology, Växtfysiologi
National Category
Botany
Research subject
Physiological Botany
Identifiers
urn:nbn:se:uu:diva-2020 (URN)91-554-5326-0 (ISBN)
Public defence
2002-05-24, the lecture hall at the department of physiological botany, EBC, Uppsala University, Uppsala, 13:00
Opponent
Available from: 2002-04-29 Created: 2002-04-29 Last updated: 2016-04-26Bibliographically approved

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Carlsbecker, Annelie

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