title: Functional analysis of GbAGL1, a D-lineage gene from cotton (Gossypium barbadense).
abstract: Cotton fibres originate from the outer ovule integument and D-lineage genes are essential for ovule development and their roles can be described by the 'ABCDE' model of flower development. To investigate the role of D-lineage genes during ovule and fibre development, GbAGL1 (GenBank accession number: FJ198049) was isolated from G. barbadense by using the SMART RACE strategy. Sequence and phylogenetic analyses revealed that GbAGL1 was a member of the D-lineage gene family. Southern blot analysis showed that GbAGL1 belonged to a low-copy gene family. Semi-quantitative RT-PCR and RNA in situ hybridization analyses revealed that the GbAGL1 gene in G. barbadense was highly expressed in whole floral bud primordia and the floral organs including ovules and fibres, but the signals were barely observed in vegetative tissues. GbAGL1 expression increased gradually with the ovule developmental stages. Over-expression of GbAGL1 in Arabidopsis caused obvious homeotic alternations in the floral organs, such as early flowering, and an extruded stigma, which were the typical phenotypes of the D-lineage gene family. In addition, a complementation test revealed that GbAGL1 could rescue the phenotypes of the stk mutant. Our study indicated that GbAGL1 was a D-lineage gene that was involved in ovule development and might play key roles in fibres development.
authors.affiliation: Plant Biotechnology Research Center, Fudan-SJTU-Nottingham Plant Biotechnology R&D Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.forename: Kai-jing
authors.initials: KJ
authors.lastname: Zuo
authors.forename: Jie-ting
authors.initials: JT
authors.lastname: Xu
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.forename: Fei
authors.initials: F
authors.lastname: Zhang
authors.forename: Hong-yan
authors.initials: HY
authors.lastname: Yao
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Cheng-xiang
authors.initials: CX
authors.lastname: Qiu
authors.forename: Xiao-fen
authors.initials: XF
authors.lastname: Sun
authors.forename: Ke-xuan
authors.initials: KX
authors.lastname: Tang
mesh_terms: D000595:Amino Acid Sequence; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D003368:Gossypium / Q000737:chemistry / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D008969:Molecular Sequence Data; D056771:Ovule / Q000737:chemistry / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D010944:Plants / Q000737:chemistry / Q000145:classification / Q000235:genetics; D017386:Sequence Homology, Amino Acid
chemical_list: D010940:Plant Proteins