title: Molecular cloning and expression analysis of an F-box protein gene responsive to plant hormones in Brassica napus.
abstract: F-box protein family is characterized by an F-box motif that has been shown to be critical for the controlled degradation of regulatory proteins. In plant, F-box protein plays an important role in signal pathways and involved in various signal transduction systems. A full-length cDNA encoding a putative F-box protein, designated as BnSLY1, was isolated from Brassica napus. The full-length cDNA of BnSLY1 was 809 bp containing a 438 bp open reading frame encoding a precursor protein of 138 amino acid residues. Comparative and bioinformatic analyses revealed that BnSLY1 showed high degree of homology with F-box proteins from other plant species and contained F-box, GGF and LSL conserved motifs. The expression of BnSLY1 under exogenous gibberellins acid-3 (GA3), abscisic acid (ABA) and GA biosynthetic inhibitor paclobutrazol (PAC) was analyzed using real-time PCR. The results showed that the expression of BnSLY1 was down-regulated after GA3 treatment and prominently induced by ABA in the low concentrations. Moreover, BnSLY1 was also induction in the high concentrations of PAC. These results suggest that the expression of BnSLY1 was regulated by the exogenous GA3, ABA and PAC and may be related to endogenous level of GA in B. napus.
authors.affiliation: Key Laboratory of Bio-Resources and Eco-Environment, Ministry of Education, College of Life Sciences, Sichuan University, 610064 Chengdu, Sichuan, People's Republic of China. yonggao1202@hotmail.com
authors.forename: Yong
authors.initials: Y
authors.lastname: Gao
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhao
authors.forename: Tingting
authors.initials: T
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Caixia
authors.initials: C
authors.lastname: Ren
authors.forename: Maolin
authors.initials: M
authors.lastname: Wang
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D000595:Amino Acid Sequence; D029688:Brassica napus / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000302:isolation & purification; D044783:F-Box Proteins / Q000235:genetics* / Q000302:isolation & purification; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D017343:Genes, Plant; D005875:Gibberellins / Q000494:pharmacology; D008969:Molecular Sequence Data; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000494:pharmacology*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D018076:DNA, Complementary; D044783:F-Box Proteins; D005875:Gibberellins; D010937:Plant Growth Regulators; D000040:Abscisic Acid