title: Sex-specific cell division during development of unisexual flowers in the dioecious plant Silene latifolia.
abstract: We analyzed cell division patterns during the differentiation of unisexual flowers of the dioecious plant Silene latifolia using in situ hybridization with histone H4 and cyclin A1 genes. The gene expression patterns indicated that the activation of cell divisions in whorls 3 and 4 was reversed in young male and female flower buds. During maturation of flower buds, a remarkable reduction in cell division activity occurred in the male gynoecium primordium and female stamen primordia. Our analyses showed that differential activation and reduction of cell division strongly correlated with sex-specific promotion and cessation in the sex differentiation of unisexual flowers.
authors.affiliation: Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8562 Japan. sachi@bio.eng.osaka-u.ac.jp
authors.forename: Sachihiro
authors.initials: S
authors.lastname: Matsunaga
authors.forename: Wakana
authors.initials: W
authors.lastname: Uchida
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Kawano
mesh_terms: D002455:Cell Division / Q000235:genetics; D019925:Cyclin A / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D018076:DNA, Complementary / Q000032:analysis / Q000235:genetics; D019143:Evolution, Molecular; D035264:Flowers / Q000235:genetics* / Q000254:growth & development* / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental / Q000235:genetics; D018506:Gene Expression Regulation, Plant / Q000235:genetics; D006657:Histones / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D018519:Meristem / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D012100:Reproduction, Asexual / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D012733:Sex Differentiation / Q000235:genetics*; D029751:Silene / Q000235:genetics* / Q000254:growth & development* / Q000378:metabolism
chemical_list: D019925:Cyclin A; D018076:DNA, Complementary; D006657:Histones; D010940:Plant Proteins