title: STAMENLESS 1, encoding a single C2H2 zinc finger protein, regulates floral organ identity in rice.
abstract: Floral organ identity is defined by organ homoetic genes whose coordinated expression is crucial with respect to the time and place of floral organ formation. Here, we report molecular cloning and characterization of the rice STAMENLESS 1 (SL1) gene that is involved in floral development. The sl1 mutant largely resembles the rice B-class gene mutant spw1; both exhibit homeotic conversions of lodicules and stamens to palea/lemma-like organs and carpels. Additionally, sl1 produces flowers with varied numbers of inner floral organs, and amorphous tissues without floral organ identity were frequently formed in whorls 3 and 4. We also show that SL1 specifies lodicule and stamen identities through positive transcriptional regulation of SPW1/OsMADS16 expression. SL1 encodes a member of the C2H2 family of zinc finger proteins, closely related to JAG of Arabidopsis. The functional divergence between SL1 and JAG implies that SL1 was co-opted for its distinctive roles in specification of floral organ identity in rice after the lineage split from Arabidopsis.
authors.affiliation: State Key Laboratory of Plant Genomics & National Plant Gene Research Centre (Beijing), Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Datun Road, Chaoyang District, Beijing 100101, China.
authors.forename: Han
authors.initials: H
authors.lastname: Xiao
authors.forename: Jinfu
authors.initials: J
authors.lastname: Tang
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Li
authors.forename: Wenming
authors.initials: W
authors.lastname: Wang
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Li
authors.forename: Liang
authors.initials: L
authors.lastname: Jin
authors.forename: Rong
authors.initials: R
authors.lastname: Xie
authors.forename: Hongfa
authors.initials: H
authors.lastname: Luo
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Zhao
authors.forename: Zheng
authors.initials: Z
authors.lastname: Meng
authors.forename: Guanghua
authors.initials: G
authors.lastname: He
authors.forename: Lihuang
authors.initials: L
authors.lastname: Zhu
mesh_terms: D002874:Chromosome Mapping; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D035264:Flowers / Q000235:genetics / Q000254:growth & development* / Q000648:ultrastructure; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D009154:Mutation; D012275:Oryza / Q000235:genetics* / Q000254:growth & development; D010641:Phenotype; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D016335:Zinc Fingers
chemical_list: D018076:DNA, Complementary; D010940:Plant Proteins