RRC ID 2380
Author Feng X, Zhao Z, Tian Z, Xu S, Luo Y, Cai Z, Wang Y, Yang J, Wang Z, Weng L, Chen J, Zheng L, Guo X, Luo J, Sato S, Tabata S, Ma W, Cao X, Hu X, Sun C, Luo D.
Title Control of petal shape and floral zygomorphy in Lotus japonicus.
Journal Proc. Natl. Acad. Sci. U.S.A.
Abstract Zygomorphic flowers, with bilateral (dorsoventral) symmetry, are considered to have evolved several times independently in flowering plants. In Antirrhinum majus, floral dorsoventral symmetry depends on the activity of two TCP-box genes, CYCLOIDEA (CYC) and DICHOTOMA (DICH). To examine whether the same molecular mechanism of floral asymmetry operates in the distantly related Rosid clade of eudicots, in which asymmetric flowers are thought to have evolved independently, we investigated the function of a CYC homologue LjCYC2 in a papilionoid legume, Lotus japonicus. We showed a role for LjCYC2 in establishing dorsal identity by altering its expression in transgenic plants and analyzing its mutant allele squared standard 1 (squ1). Furthermore, we identified a lateralizing factor, Keeled wings in Lotus 1 (Kew1), which plays a key role in the control of lateral petal identity, and found LjCYC2 interacted with Kew1, resulting in a double mutant that bore all petals with ventralized identity to some extents. Thus, we demonstrate that CYC homologues have been independently recruited as determinants of petal identities along the dorsoventral axis in two distant lineages of flowering plants, suggesting a common molecular origin for the mechanisms controlling floral zygomorphy.
Volume 103(13)
Pages 4970-5
Published 2006-3-28
DOI 10.1073/pnas.0600681103
PII 0600681103
PMID 16549774
PMC PMC1458779
MeSH Alleles Amino Acid Sequence Conserved Sequence Flowers / anatomy & histology* Flowers / genetics Flowers / growth & development* Flowers / metabolism Gene Expression Regulation, Plant Lotus / anatomy & histology* Lotus / genetics Lotus / growth & development* Lotus / metabolism Molecular Sequence Data Mutation / genetics Phylogeny Plant Proteins / chemistry Plant Proteins / genetics Plant Proteins / metabolism Plants, Genetically Modified Sequence Alignment
IF 9.58
Times Cited 162
Lotus / Glycine Gifu B-129 Miyakojima MG-20