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园艺学报 ›› 2012, Vol. 39 ›› Issue (5): 923-930.

• 蔬菜 • 上一篇    下一篇

欧洲山芥皂苷合成关键酶基因Bv-beta-AS 克隆及表达分析

 魏小春, 张晓辉, 吴青君, 王海平, 沈镝, 邱杨, 宋江萍, 李锡香   

  1. (中国农业科学院蔬菜花卉研究所,农业部蔬菜作物基因资源与种质创制北京科学观测实验站,北京 100081)
  • 出版日期:2012-05-25 发布日期:2012-05-25

Cloning,Characterization and Real-time RT-PCR Analysis of a Key Gene beta-Amyrin synthase for Saponin Biosynthesis in Barbarea vulgaris

WEI  Xiao-Chun, ZHANG  Xiao-Hui, WU  Qing-Jun, WANG  Hai-Ping, SHEN  Di, QIU  Yang, SONG  Jiang-Ping, LI  Xi-Xiang   

  1. (Institute of Vegetables and Flowers,China Academy of Agricultural Sciences,China Academy of Agricultural Sciences,Beijing Research Station of Vegetable Crop Gene Resource and Germplasm Enhancement Ministry of Agriculture,Beijing 100081,China)
  • Online:2012-05-25 Published:2012-05-25

摘要: 以能够产生抗虫皂苷的高抗小菜蛾资源G 型欧洲山芥(Barbarea vulgaris R. Br.)B44 为材料,利用RACE 技术克隆出皂苷合成关键酶beta–香树脂合成酶的基因(Barbarea vulgaris beta-amyrin synthase,Bv-beta-AS)。该基因编码区序列长为2 289 bp(GenBank 登录号JQ172795),推导其编码762个氨基酸;在基因组水平上长度为4 107 bp (GenBank 登录号JQ172796),含有15 个内含子。Bv-beta-AS编码的氨基酸具有beta–香树脂合成酶基因家族的保守序列,即DCTAE 序列和QW 特征序列,氨基酸多序列比对和进化树分析表明,该基因与拟南芥beta–香树脂合成酶基因的相似性最高,为74%。利用荧光定量PCR 对欧洲山芥在小菜蛾诱导下该基因的表达进行研究,结果表明,该基因受虫害诱导时上调表达,但是上升到12 h 达顶峰后随时间推移呈回归的趋势。从序列特征和表达模式上推测,Bv-beta-AS 可能是抗虫皂苷合成途径的一个关键酶的基因。

关键词: 欧洲山芥, 小菜蛾, 皂苷, beta–香树脂合成酶, 克隆, 荧光定量RT-PCR, 抗虫

Abstract: G-type Barbarea vulgaris R.Br. which producesaponins is a rare insect resistant vegetable in Cruciferae. A beta-amyrin synthase gene which codes a key enzyme of saponin biosynthesis pathway was cloned from Barbarea vulgaris R.Br. using RT-PCR and RACE(Rapid Amplification of cDNA Ends)method,and named as Bv-beta-AS. The Bv-beta-AS contained a coding sequence of 2 289 bp(GenBank accession number:JQ172795),which encoded 762 amino acids. The gene of 4 107 bp from genomic DNA was further cloned,which contained 15 introns embedded in its coding sequences. The deduced protein of this gene contained the conserved characteristic motif of beta-amyrin synthase -DCTAE and QW. And the  high similarity of this gene with the beta-amyrin synthase from other plants indicated it was a homologue of beta-amyrin synthase. Multiple sequence alignments and phylogenetic tree analyses showed that Bv-beta-AS was clustered with Arabidopsis beta-amyrin synthase and showed the highly similarity(74%) in amino acid sequences. The expression of Bv-beta-AS under the diamondback moth(Plutella xylostella) attack was determined by real-time RT-PCR. The results showed that Bv-beta-AS gene expression was up-regulate within 12 h of diamondback moth attack,but decline tendency appeared after 12 hours. Both the sequences analysis results and the real-time RT-PCR data indicated that Bv-beta-AS may be an important candidate gene of saponin biosynthesis pathway. d

Key words: Barbarea vulgaris, Plutella xylostella, saponin, beta-amyrin synthase, cloning, real-time RT-PCR, insect resistant