Functional analysis of GbAGL1, a D-lineage gene from cotton (Gossypium barbadense).
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.
Liu
Xiang
X
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.
Zuo
Kai-jing
KJ
Xu
Jie-ting
JT
Li
Ying
Y
Zhang
Fei
F
Yao
Hong-yan
HY
Wang
Yue
Y
Chen
Yu
Y
Qiu
Cheng-xiang
CX
Sun
Xiao-fen
XF
Tang
Ke-xuan
KX
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
D010940:Plant Proteins