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Functional and evolutionary analysis of flowering time genes in Brassica nigra and Physcomitrella patens

Hedman, Harald (2008). Functional and evolutionary analysis of flowering time genes in Brassica nigra and Physcomitrella patens. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2008:55
ISBN 978-91-85913-88-6
[Doctoral thesis]

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Plant genomes harbour many gene families reminiscent of previous duplication events. In this thesis, the molecular evolution of duplicated genes is analysed with special emphasis on flowering-time genes. In Brassica nigra, a close relative to Arabidopsis, three COL genes have been associated with flowering time (BnCOa, BnCOb and BnCOL1). The molecular evolution of these genes have been studied. All aspects of the data can not easily be explained by demography, indicating that selection has played a role in shaping the variation at these genes. BnCOb appear to be in the early process of pseudogenization. A functional study of COL genes in the moss Physcomitrella patens shows that in Ppcol3 knockout mutants, the generation of gametophores (leafy shoots) was diminished under blue light. Indicating that PpCOL3 is required for gametophore development Stem elongation was affected in white light in Ppcol2-Ppcol3 double mutants, but not in a Ppcol3 single mutant, suggesting that PpCOL2 might be involved in growth regulation of the gametophore. A phylogenetic study of plant PEBP genes show that three major clades exists in land plants: the basal MFT clade and FT and TFL1 clades. An analysis of positively selected sites in the tree branches identified six putatively selected sites. A detailed study of the basal MFT clade, together with an expression analysis in Physcomitrella, shows that moss MFT-like genes are light-induced and appear to be associated with development of reproductive structures.

Authors/Creators:Hedman, Harald
Title:Functional and evolutionary analysis of flowering time genes in Brassica nigra and Physcomitrella patens
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2008
Number of Pages:40
ALLI. Sjödin, P., Hedman, H., Kruskopf Österberg, M., Gustafsson, S., Lagercrantz, U., Lascoux, M. (2008). Polymorphism and divergence at three duplicate genes in Brassica nigra. Journal of Molecular Evolution 66 (6), 581-590. II. Sjödin, P., Hedman, H., Shavorskaya, O., Finet, C., Lascoux, M., Lagercrantz, U. (2007). Recent degeneration of an old duplicated flowering time gene in Brassica nigra. Heredity 98 (6), 375-384. III. Hedman, H., Thelander, M., Ronne, H., Lagercrantz, U. (2008). PpCOL2 and PpCOL3 are involved in growth and development in Physcomitrella patens. (Manuscript). IV. Hedman, H., Källman, T., Moore, D., Lascoux, M., Lagercrantz, U., Gyllenstrand, N. (2007). Molecular evolution of the PEBP gene family in plants: evidence of positive selection on amino acids involved in functional change (Submitted). V. Hedman, H., Källman, T., Lagercrantz, U. (2008). Early evolution of the MFT-like gene family in plants (Submitted).
Place of Publication:Uppsala
ISBN for printed version:978-91-85913-88-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:brassica nigra, bryophyta, flowering, genes, evolution, molecular biology, photoperiodicity
Keywords:Flowering time, Molecular evolution, CONSTANS, FLOWERING LOCUS T, Brassica nigra, Physcomitrella patens
Permanent URL:
ID Code:1796
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: Harald Hedman
Deposited On:25 Aug 2008 00:00
Metadata Last Modified:02 Dec 2014 10:14

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