中国农业科学 ›› 2006, Vol. 39 ›› Issue (06): 1153-1158 .

• 植物保护 • 上一篇    下一篇

CP基因3'端短片段介导的对马铃薯Y病毒的抗性

竺晓平,朱常香,宋云枝,温孚江,刘红梅,李向东   

  1. 山东农业大学生命科学学院
  • 收稿日期:2005-12-02 修回日期:1900-01-01 出版日期:2006-06-10 发布日期:2006-06-10
  • 通讯作者: 温孚江

Resistance to Potato virus Y Mediated by the 3′end Segments of Coat Protein Gene in the Transgenic Tobacco Plants

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  1. 山东农业大学生命科学学院
  • Received:2005-12-02 Revised:1900-01-01 Online:2006-06-10 Published:2006-06-10

摘要: 【目的】探明马铃薯Y病毒脉坏死株系(PVYN)CP基因3′端序列短片段的不同结构转基因诱导转基因植物产生RNA介导抗性的有效性。【方法】以PVYN的CP基因cDNA 3′端202 bp片段构建非翻译的正向重复和反向重复结构的植物表达载体转化烟草。【结果】攻毒试验表明前者没有一例转基因植株表现为抗病,而转化反向重复结构的转基因植株82.8%表现近似免疫的高度抗病型,Southern印迹杂交证明目的基因已整合到烟草基因组,Northern印迹杂交结果显示反向重复结构转基因植物的抗病性与RNA的表达量呈现负相关。【结论】抗病性是RNA介导的病毒抗性。3′端短片段诱导产生的转基因抗病株比例比5′端短片段诱导产生的高。

关键词: 马铃薯Y病毒, RNA介导的病毒抗性, DsRNA, RNA沉默

Abstract: 【Objective】To determine and compare the induction efficiency of RNA silencing triggered by different construction transgene of 3′ -terminal segment derived from the Potato virus Y (veinal necrosis strain, PVYN ) coat protein gene.【Method】Transgenic tobacco plants expressing untranslated direct repeats (DR) and inverted repeats (IR) of 3′ -terminal 202bp of the PVYN coat protein gene were obtained via Agrobacterium tumefaciens-mediated transformation system. 【Result】Resistance assay of the transgenic plants indicated that none of the DR-transgenic plants are resistant to PVY, but 82.8% of IR-transgenic plants showed high resistance. Northern blot analysis revealed an inverse correlation between transgene transcript accumulation and virus resistance.【Conclusion】These results showed that the resistance was RNA-mediated. The proportion of the resistant transgenic plants induced by 3′ -terminal segment transgene of PVYN is higher than that induced by 5′ -terminal segment.

Key words: Potato virus Y, RNA-mediated virus resistance, Ds RNA, RNA silencing