The phosphatidylethanolamine-binding proteins (PEBP) widely exist in eukaryotes. In angiosperms, PEBP family genes play important role in promoting or inhibiting flowering, as well as plant architecture control. Eight PEBP genes were iden-tified from diploid cottonGossypiumarboreum (A2) andGossypium raimondii (D5) genome database, respectively. All the PEBP genes of cotton contained four exons and three introns, and their encoded proteins contained a conserved PEBP motif and critical amino acid sites of PEBP family, which indicated there were at least eight PEBP genes in diploid cotton. Phylogenetic analysis showed that eight cotton PEBP genes comprised three subfamilies:FLOWERING LOCUS T (FT)-like containing one gene, TERMINAL FLOWER 1 (TFL1)-like containing five genes including threeTFL1 and twoBFT genes, andMOTHER OF FT AND TFL1 (MFT)-like containing two genes. The expression patterns of eightGossypium hirsutum PEBP family genes in root, stem, leaf, shoot apical meristem, flower, ovule and 25 days post-anthesis (DPA) fiber were determined with quantitative Real-time reverse transcription PCR (qRT-PCR). The results showed thatFT1 transcript was preferentially expressed in leaf and secondly in fiber, ovule and flower.MFT1 expressed in all the tissues, with the highest expression level in fiber, then in flower and leaf, while MFT2 transcript was preferentially expressed in leaf.TFL1a,TFL1b, andTFL1c expressed mainly in root, andTFL1c also ex-pressed in leaf, flower and ovule. Expression ofBFT1 andBFT2 were present mainly in leaf, and that ofBFT1 in the other six tissues except for shoot apical meristem (SAM) were higher than that ofBFT2. Expression analysis revealed that eight PEBP genes in cotton have different expression patterns, showing their different functional roles in regulation of cotton development.%磷脂酰乙醇胺结合蛋白(phosphatidyl ethanolamine-binding proteins, PEBP)基因家族广泛存在于真核生物中,在被子植物中主要起着促进或抑制开花和控制株型的作用。利用亚洲棉(Gossypiumarboreum, A2)和雷蒙德氏棉(Gossypium raimondii, D5)的基因组数据库,分别搜索到8个棉花PEBP同源基因,都包含4个外显子和3个内含子,编码的蛋白都存在PEBP家族的保守基序和关键氨基酸位点,表明二倍体棉花中至少存在8个PEBP家族基因。进化分析表明,8个PEBP基因分属于3个亚家族,含FLOWERING LOCUS T(FT)-like亚家族1个、TERMINAL FLOWER 1(TFL1)-like亚家族5个(包括3个TFL1和2个BFT)、MOTHER OF FT AND TFL1(MFT)-like亚家族2个。实时荧光定量PCR分析陆地棉(Gossypium hirsutum)8个PEBP基因在根、茎、叶、幼苗顶端分生组织、花、胚珠和25 d的纤维组织中的表达,表明FT1在叶片中表达量最高,其次在纤维、胚珠和花中； MFT1在各组织中均表达,但在纤维中表达量最高,其次是花和叶片中,而MFT2以在叶片中表达为主； TFL1a、TFL1b和TFL1c均在根中表达量最高,但TFL1c 在叶片、花和胚珠中也有相对较高的表达； BFT1和 BFT2在叶片中表达量最高,但除幼苗顶端分生组织外, BFT1在其他各组织中的表达明显高于BFT2。这些结果表明, PEBP家族基因在棉花的生长发育中可能具有不同的功能。
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