title: Sex determination in plants.
abstract: Most dioecious plant species are believed to derive from hermaphrodite ancestors. The regulatory pathways that have been modified during evolution of the hermaphrodite ancestors and led to the emergence of dioecious species (with separate sexes) still remain unknown. Silene latifolia is a dioecious plant species harbouring XY sex chromosomes. To identify the molecular mechanisms involved in female organ suppression in male flowers of S. latifolia, we looked for genes potentially involved in the establishment of floral organ and whorl boundaries. We identified Arabidopsis thaliana homologs of SHOOTMERISTEMLESS (STM) and CUP SHAPED COTYLEDON 1 (CUC1) and CUC2 genes in S. latifolia. Our phylogenetic analyses suggest that we identified true orthologs for both types of genes. Detailed expression analyses showed a conserved expression pattern for these genes between S. latifolia and A. thaliana, suggesting a conserved function of the corresponding proteins. Both orthologs showed clear differences in their expression pattern between males and females or hermaphrodites suggesting their possible involvement in the sex determination pathway in S. latifolia.
authors.forename: Françoise
authors.initials: F
authors.lastname: Monéger
references.citation: Nature. 2000 Mar 23;404(6776):388-90
references.pmid: 10746725
references.citation: EMBO J. 1999 Aug 2;18(15):4169-79
references.pmid: 10428956
references.citation: Nature. 1998 May 21;393(6682):263-6
references.pmid: 9607762
references.citation: PLoS Biol. 2005 Jan;3(1):e4
references.pmid: 15630476
references.citation: Genetics. 1999 Mar;151(3):1173-85
references.pmid: 10049933
references.citation: Genome. 1997 Oct;40(5):705-15
references.pmid: 9352647
references.citation: J Plant Res. 2002 Dec;115(6):411-7
references.pmid: 12579444
references.citation: Plant Cell. 1994 Dec;6(12):1775-87
references.pmid: 7866023