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MBE Advance Access published online on April 2, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msg089
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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Accepted January 13, 2003
© 2003 Society for Molecular Biology and Evolution

Original Articles

MADS-Box Genes in Ginkgo biloba and the Evolution of the AGAMOUS Family

Muriel Jager 1, Alexandre Hassanin 1, Michael Manuel 1, Hervé Le Guyader 2, Jean Deutsch 3*

1 Service de Biosystématique, Université P et M Curie, Paris, France
2 Service de Biosystématique, Université P et M Curie, Paris, France; Équipe Développement et Évolution, UMR 7622 "Biologie du Développement" CNRS & Université P et M Curie, Paris, France
3 Équipe Développement et Évolution, UMR 7622 "Biologie du Développement" CNRS & Université P et M Curie, Paris, France

* To whom correspondence should be addressed. E-mail: jean.deutsch{at}snv.jussieu.fr.


  Abstract

MADS-box proteins are a large family of transcription factors. In plants, many genes belonging to this family are involved in the homeosis of the floral system. Up to now, they have mainly been studied in angiosperms, especially in the model species Arabidopsis thaliana and Antirrhinum majus. We undertook a study of MADS-box genes in Ginkgo biloba, the unique extant representative of a whole branch of the phylogenetic tree of the seed plants. A PCR survey reveals the diversity of MADS-box genes present in the genome of the Ginkgo. Duplications probably occurred specifically in the ginkgophyte lineage. Phylogenetic analyses revealed that one of these genes, GBM5, is an orthologue of the AGAMOUS gene of A. thaliana. We cloned and sequenced the entire cDNA of the GBM5 gene and studied its intron/exon structure. We showed by RT-PCR that it is expressed in both floral and vegetative tissues. We discuss the molecular evolution of the AGAMOUS family of genes.

Key Words: developmental genes, floral organs, gene expression, gymnosperms, phylogeny


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