title: Analysis of the formation of flower shapes in wild species and cultivars of tree peony using the MADS-box subfamily gene.
abstract: Tree peony (Paeonia suffricotisa) cultivars have a unique character compared with wild species; the stamen petalody results in increased whorls of petals and generates different flower forms, which are one of the most important traits for cultivar classification. In order to investigate how petaloid stamens are formed, we obtained the coding sequence (666 bp) and genomic DNA sequence of the PsTM6 genes (belongs to B subfamily of MADS-box gene family) from 23 tree peony samples, Five introns and six exons consisted of the genomic DNA sequence. The analysis of cis-acting regulatory elements in the third and fourth intron indicated that they were highly conserved in all samples. Partial putative amino acids were analyzed and the results suggested that functional differentiation of PsTM6 paralogs apparently affected stamen petalody and flower shape formation due to due to amino acid substitution caused by differences in polarity and electronic charge. Sliding window analysis indicated that the different regions of PsTM6 were subjected to different selection forces, especially in the K domain. This is the first attempt to investigate genetic control of the stamen petalody based on the PsTM6 sequence. This will provide a basis for understanding the evolution of PsTM6 and its the function of in determining stamen morphology of tree peony.
authors.affiliation: Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences, 20 Nanxin Cun, Xiangshan, Haidian District, Beijing 100093, PR China. shuqy@ibcas.ac.cn
authors.forename: Qingyan
authors.initials: Q
authors.lastname: Shu
authors.forename: Liangsheng
authors.initials: L
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.forename: Hui
authors.initials: H
authors.lastname: Du
authors.forename: Zheng'an
authors.initials: Z
authors.lastname: Liu
authors.forename: Hongxu
authors.initials: H
authors.lastname: Ren
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D035264:Flowers / Q000033:anatomy & histology* / Q000235:genetics* / Q000254:growth & development; D017343:Genes, Plant; D005809:Genes, Regulator; D026161:MADS Domain Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D029596:Paeonia / Q000235:genetics* / Q000254:growth & development; D010802:Phylogeny; D014197:Trees / Q000235:genetics
chemical_list: D026161:MADS Domain Proteins