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Flower development of Lilium longiflorum - The Lilium information ...

Flower development of Lilium longiflorum - The Lilium information ...

Chapter 1 Winter K-U,

Chapter 1 Winter K-U, Weiser C, Kaufmann K, Bohne A, Kirchner C, Kanno A, Saedler H, Theissen G (2002) Evolution of class B floral homeotic proteins: obligate heterodimerization originated from homodimerization. Mol Biol Evol 19: 587-596 Wolfe KH, Gouy M, Yang YW, Sharp PM, Li W-H (1989) Data of monocot divergence estimated from chloroplast DNA sequence data. Proc Natl Acad Sci USA 86: 6201-6205 Yang Y, Fanning L, Jack T (2003) The K domain mediates heterodimerization of the Arabidopsis floral organ identity proteins, APETALA3 and PISTILLATA. Plant J 33: 47-59 Zhang H, Forde BG (1998) An Arabidopsis MADS-box gene that controls nutrient-induced changes in root architecture. Science 279: 407-409 Zik M, Irish VF (2003) Global identification of target genes regulated by APETALA3 and PISTILLATA floral homeotic gene action. Plant Cell 15: 207-222 14

CHAPTER 2 Characterisation of LLAG1 in Arabidopsis Ectopic expression of LLAG1, an AGAMOUS homologue from lily (Lilium longiflorum Thunb.) causes floral homeotic modifications in Arabidopsis Vagner A. Benedito 1 , Peter B. Visser 1 , Jaap M. van Tuyl 1 , Gerco C. Angenent 1 , Sacco C. de Vries 2 , and Frans A. Krens 1 1 Plant Research International, Droevendaalsesteeg 1, 6700 AA Wageningen, The Netherlands; 2 Wageningen University, Laboratory of Biochemistry, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands. Abstract The ABC model for floral development was proposed more than 10 years ago and since then many studies have been performed in model species, such as Arabidopsis thaliana, Antirrhinum majus and many other species in order to confirm this model. This has led to additional information on flower development and to more complex molecular models. AGAMOUS (AG) is the only C type gene in Arabidopsis and it is responsible for stamen and carpel development as well as floral determinacy. LLAG1, a putative AG orthologue from lily (Lilium longiflorum Thunb.) was isolated by screening a cDNA library derived from developing floral buds. The deduced amino acid sequence revealed the MIKC structure and a high homology in the MADS-box among AG and other orthologues. Phylogenetic analysis indicated close relationship between LLAG1 and AG orthologues from monocot species. Spatial expression data showed LLAG1 transcripts exclusively in stamens and carpels, constituting the C domain of the ABC model. Functional analysis was carried out in Arabidopsis by overexpression of LLAG1 driven by the CaMV 35S promoter. Transformed plants showed homeotic changes in the two outer floral whorls with some plants having the second whorl completely converted into stamens. Altogether, these data indicate a functional relationship between LLAG1 and AG. 15

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