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园艺学报 ›› 2007, Vol. 34 ›› Issue (2): 403-406.

• 蔬菜 • 上一篇    下一篇

马铃薯kunitz型蛋白酶抑制子基因片段的分离及表达分析

李广存1,2;金黎平1;谢开云1;卞春松1;段绍光1;屈冬玉1*   

  1. (1中国农业科学院蔬菜花卉研究所, 北京100081; 2山东省农业科学院高新技术研究中心, 济南250100)
  • 收稿日期:2006-07-20 修回日期:2007-01-29 出版日期:2007-04-25 发布日期:2007-04-25
  • 通讯作者: 屈冬玉

Isolation and Expression Analysis of Kunitz-type Enzyme Inhibitor GeneFragment in Potato (Solanum tube rosum L. )

LI Guang-cun1,2,JIN Li-ping1,XIE Kai-yun1,BIAN Chun-song1,DUAN Shao-guang1, and QU Dong-yu1*   

  1. (1Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2High-Tech Research Center, Shandong Academ y of Agricultural Sciences, Jipnan 250100, China)
  • Received:2006-07-20 Revised:2007-01-29 Online:2007-04-25 Published:2007-04-25
  • Contact: QU Dong-yu1

摘要: 以马铃薯高抗青枯病基因型ED13为材料, 利用cDNA-RGA方法获得了青枯病菌处理和水对
照处理之间的差异表达片段( KTI-like EST) 。该EST与kunitz2type抑制子基因高度同源, 属于kunitz-type抑制子基因家族, 是马铃薯半胱氨酸蛋白酶抑制子基因家族的重要成员。半定量RT-PCR分析表明该基因受青枯病菌的诱导, 12 h内启动表达, 48 h内表达量达最高。马铃薯半胱氨酸蛋白酶抑制子基因参与马铃薯对病原的抗病防御, 推测所获得的KTI2like EST也可能参与了马铃薯的抗病防御。

关键词: 马铃薯, 马铃薯青枯病, cDNA-RGA, KTI-like EST, RT-PCR

Abstract:

The differentially exp ressed fragment, designated as kunitz2type enzyme inhibitor like (KTI-like) EST, was isolated from ED13 with high resistance to Ra lstonia solanacearum (Rs) using cDNA-RGA (resistance gene analogs, RGA). Results of BLAST against NCB I database showed that the KTI-like EST
shared a high similaritywith kunitz2type inhibitor genes, and might be one of the importantmembers of potato cysteine proteinase inhibitor (PCPI) gene family. Analysis of semi2quantity RT2PCR indicated that the KTI-like gene was induced by Rs and itwas trigged to express before 12 h and reached the highest level at about 48 h post-inoculation, then leveled off. Results of this study combined with the fact that PCPI is involved in plant defence against insects and pathogens indicated that the KTI2like gene might play an important role in plant resistance against Rs.

Key words: Potato, Potato bacterial wilt, cDNA-RGA, KTI-like EST, RT-PCR

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