https://www.ahs.ac.cn/images/0513-353X/images/top-banner1.jpg|#|苹果
https://www.ahs.ac.cn/images/0513-353X/images/top-banner2.jpg|#|甘蓝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner3.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner4.jpg|#|灵芝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner5.jpg|#|桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner6.jpg|#|黄瓜
https://www.ahs.ac.cn/images/0513-353X/images/top-banner7.jpg|#|蝴蝶兰
https://www.ahs.ac.cn/images/0513-353X/images/top-banner8.jpg|#|樱桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner9.jpg|#|观赏荷花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner10.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner11.jpg|#|月季
https://www.ahs.ac.cn/images/0513-353X/images/top-banner12.jpg|#|菊花

园艺学报 ›› 2013, Vol. 40 ›› Issue (12): 2373-2381.

• 果树 • 上一篇    下一篇

苹果MdGA20ox1 基因的克隆、亚细胞定位及表达分析

姜志昂, 孙建设, 彭建营, 邵建柱   

  1. 河北农业大学园艺学院,河北保定 071000
  • 出版日期:2013-12-25 发布日期:2013-12-25

Isolation,Subcellular Location and Expression of MdGA20ox1 Gene from Apple

 JIANG  Zhi-Ang, SUN  Jian-She, PENG  Jian-Ying, SHAO  Jian-Zhu   

  1. College of Horticulture,Agricultural University of Hebei,Baoding,Hebei 071000,China
  • Online:2013-12-25 Published:2013-12-25

摘要: 以苹果砧木SH40[(Malus × domestica)× M. honanensis]为试材,采用RT-PCR 结合RACE
技术从SH40 茎尖中克隆得到一个赤霉素合成关键酶基因(GA20–氧化酶基因),命名为MdGA20ox1
其cDNA 全长1 579 bp,编码392 个氨基酸。该基因在GenBank 登录号为KC493633。氨基酸序列同源性
分析表明:MdGA20ox1 与玉米、拟南芥、梨等植物GA20ox 具有55.9% ~ 96.7%的相似性。洋葱表皮细
胞瞬时表达显示,MdGA20ox1 蛋白定位于细胞核与细胞质膜。植株生长量测定和相对定量表达结果表明,
MdGA20ox1 基因在砧木SH28、SH40 和M26 自根苗的表达呈先下降再上升然后下降的趋势,这与其生长
动态基本一致。嘎啦/SH28 的植株生长量和MdGA20ox1 表达量最高,嘎啦/M26 次之,嘎啦/SH40 最低,
初步表明该基因的表达有与苹果植株矮化程度呈负相关的趋势。MdGA20ox1 在嘎啦/SH40 和嘎啦/SH28
不同组织中的表达模式一致,且半矮化类型砧木SH28 嫁接‘嘎啦’,其茎尖、幼叶、成熟叶和枝皮中的
表达量均高于矮化类型SH40 嫁接‘嘎啦’。

关键词: 苹果, 砧木, MdGA20ox1, 克隆, 表达, 亚细胞定位

Abstract: GA20-oxidase is a critical enzyme in the pathway of gibberellins biosynthesis. In this
research,a GA20-oxidase gene in Malus,designated as MdGA20ox1(GenBank accession number:
KC493633),was isolated from the apical tissue of apple rootstock SH40[(Malus × domestica)× M.
honanensis] by RT-PCR and RACE method. The length of full cDNA was 1 579 bp,containing a complete
open reading frame that encoding 392 amino acids. Amino acid sequence analysis revealed that the
sequence of MdGA20ox1 had 55.9%–96.7% identities with the sequence of GA20ox from plants such as
Zea mays,Arabidopasis thaliana,Pyrus communis and so on. Subcellular localization showed that the
MdGA20ox1 protein was located in the nucleus and the plasma membrane. The expression of MdGA20ox1
in SH28,SH40 and M26 showed a trend of decline-rise-decline,which were corresponded with the growing periods of their own-rooted seedlings. The expression of MdGA20ox1 and growth increment of
SH28 grafted cultivar‘Gala’were the highest of them,M26 grafted cultivar‘Gala’were higher than the
SH40 grafted cultivar‘Gala’. And the expression intensity of the MdGA20ox1 gene was negatively
associated to the dwarfing degree of the different rootstocks. The trend of expression of MdGA20ox1 gene
was the same in SH40 and SH28 grafted cultivar‘Gala’. The expression of MdGA20ox1 gene in the apical
tissue,young leaf,leaf and branch bark of semi-dwarf type SH28 grafted cultivar‘Gala’were higher than
dwarf type SH40 grafted cultivar‘Gala’.

Key words: apple, rootstock, MdGA20ox1, cloning, expression, subcellular location

中图分类号: