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园艺学报 ›› 2017, Vol. 44 ›› Issue (5): 828-838.doi: 10.16420/j.issn.0513-353x.2016-0655

• 研究论文 • 上一篇    下一篇

苹果‘长富2号’开花调控转录因子基因MdIDD7的克隆及表达分析

齐思言*,邢利博*,张 东,杜利莎,李有梅,樊 胜,马娟娟,赵彩平,韩明玉**   

  1. 西北农林科技大学园艺学院,陕西杨凌 712100
  • 出版日期:2017-05-25 发布日期:2017-05-25

Molecular Cloning and Expression Analysis of the Flowering Regulation Transcription Factor Gene MdIDD7 in Malus × domestica

QI Siyan*,XING Libo*,ZHANG Dong,DU Lisha,LI Youmei,FAN Sheng,MA Juanjuan,ZHAO Caiping,and HAN Mingyu**   

  1. College of Horticulture,Northwest A & F University,Yangling,Shannxi 712100,China
  • Online:2017-05-25 Published:2017-05-25

摘要:

以‘长富2号’苹果为试验材料,采用RT-PCR的方法,从其芽中克隆得到INDETERMINATE DOMAIN(IDD)转录因子基因MdIDD7,其开放阅读框长度为1 626 bp,编码541个氨基酸。序列比对和结构域分析表明,该转录因子含有1个核定位信号和4个高度保守的锌指蛋白结构域。系统进化树分析表明,MdIDD7与白梨(Pyrus × bretschneideri,XP_009364602.1)、桃(Prunus persica,XP_007225628.1)和梅(Prunus mume,XP_008220893.1)聚在一起。实时荧光定量PCR表明,MdIDD7在‘长富2号’不同组织(茎、叶、花、果和芽)中均有表达,其中芽的表达量最高。花后40 ~ 60 d,MdIDD7在易成花品种‘烟富6号’芽中表达量显著高于难成花品种‘长富2号’。“小年”树顶芽组织中MdIDD7的表达量显著高于“大年”树。在花芽诱导前期,外源GA处理诱导MdIDD7下调表达,而蔗糖处理诱导其上调表达,说明MdIDD7响应激素和糖信号,促进苹果成花。以‘长富2号’苹果为试验材料,采用RT-PCR的方法,从其芽中克隆得到INDETERMINATE DOMAIN(IDD)转录因子基因MdIDD7,其开放阅读框长度为1 626 bp,编码541个氨基酸。序列比对和结构域分析表明,该转录因子含有1个核定位信号和4个高度保守的锌指蛋白结构域。系统进化树分析表明,MdIDD7与白梨(Pyrus × bretschneideri,XP_009364602.1)、桃(Prunus persica,XP_007225628.1)和梅(Prunus mume,XP_008220893.1)聚在一起。实时荧光定量PCR表明,MdIDD7在‘长富2号’不同组织(茎、叶、花、果和芽)中均有表达,其中芽的表达量最高。花后40 ~ 60 d,MdIDD7在易成花品种‘烟富6号’芽中表达量显著高于难成花品种‘长富2号’。“小年”树顶芽组织中MdIDD7的表达量显著高于“大年”树。在花芽诱导前期,外源GA处理诱导MdIDD7下调表达,而蔗糖处理诱导其上调表达,说明MdIDD7响应激素和糖信号,促进苹果成花。

关键词: 苹果, 成花诱导, MdIDD7, 基因克隆, 表达分析

Abstract:

Using the‘Fuji’apple,we cloned a key transcription factor INDETERMINATE DOMAIN(IDD)family gene MdIDD7,in which had 1 626 bp of open reading frame(ORF)and encoded 541 amino acids. By the sequence alignment and domain analysis,its contained a nuclear localization signal(NLS)and four zinc finger protein conserved domains. Phylogenetic tree analysis showed that MdIDD7 gene of Malus × domestica,Pyrus × bretschneideri(XP_009364602.1),Prunus persica (XP_007225628.1),Prunus mume(XP_008220893.1)were clustered together. The MdIDD7 gene was expressed in five different tissues(stem,leaf,flower,fruit and bud) of‘Fuji’apple trees,and its expression in buds was the highest. During the days after flowering(from 40 to 60 days),the expression levels of MdIDD7 gene was significantly higher in‘Yanfu 6’than in‘Changfu 2’apple. Inaddition,the expression level of MdIDD7 gene was significantly higher in“Off-year”trees than in“On-year”trees. In the early stage of flower bud induction,the expression of MdIDD7 gene was significantly down-regulated in the exogenous GA treatment compared to water spring treatment,but was significantly up-regulated in sucrose treatment during the early stages of flower bud induction,suggesting that the MdIDD7 can promote apple flower bud formation in response to GA and sugar signaling.

Key words: apple, flowering induction, MdIDD7, gene clone, expression analysis