title: Ectopic expression of a poplar APETALA3-like gene in tobacco causes early flowering and fast growth.
abstract: A MADS-box gene, designated PtAP3, was isolated from a floral bud cDNA library derived from Populus tomentosa. Analysis by multiple alignments of both nucleotide and amino acid sequences, together with phylogenetic analysis, revealed that PtAP3 is an ortholog of Arabidopsis AP3. Analysis of RNA extracts from vegetative and reproductive tissues of P. tomentosa by RT-PCR indicated that PtAP3 is expressed in roots, stems, leaves and vegetative and floral buds. Notably, the expression of PtAP3 fluctuated during floral bud development between September and February with differences between male and female buds. In the former, a gradual down-regulation during this period, interrupted by a slight up-regulation in December, was followed by a sharper up-regulation on February. In developing female floral buds, expression was stable from September to November, sharply up-regulated in December, and then gradually down-regulated until February. The functional role of PtAP3 was investigated in transgenic tobacco plants. Of 25 transformants, nine displayed an earlier flowering phenotype compared with the wild type plants. Furthermore, transgenic tobacco had faster growth and more leaves than untransformed controls. The traits proved to be heritable between the T0 and T1 generations. Our results demonstrate a regulatory role of the PtAP3 gene during plant flowering and growth and suggest that the gene may be an interesting target for genetic modification to induce early flowering in plants.
authors.affiliation: National Engineering Laboratory for Tree Breeding, People's Republic of China.
authors.forename: Xinmin
authors.initials: X
authors.lastname: An
authors.forename: Meixia
authors.initials: M
authors.lastname: Ye
authors.forename: Dongmei
authors.initials: D
authors.lastname: Wang
authors.forename: Zeliang
authors.initials: Z
authors.lastname: Wang
authors.forename: Guanlin
authors.initials: G
authors.lastname: Cao
authors.forename: Huiquan
authors.initials: H
authors.lastname: Zheng
authors.forename: Zhiyi
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics; D029681:Arabidopsis Proteins / Q000235:genetics; D001483:Base Sequence; D001709:Biotechnology; D018744:DNA, Plant / Q000235:genetics; D035264:Flowers / Q000254:growth & development; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D026161:MADS Domain Proteins / Q000737:chemistry / Q000235:genetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010641:Phenotype; D010802:Phylogeny; D018515:Plant Leaves / Q000254:growth & development; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics; D030821:Plants, Genetically Modified; D032107:Populus / Q000235:genetics*; D017434:Protein Structure, Tertiary; D012621:Seasons; D017386:Sequence Homology, Amino Acid; D014026:Nicotiana / Q000235:genetics* / Q000254:growth & development
chemical_list: C101342:APETALA 3 protein, Arabidopsis; D029681:Arabidopsis Proteins; D018744:DNA, Plant; D026161:MADS Domain Proteins; D010940:Plant Proteins