欢迎访问林业科学,今天是

林业科学 ›› 2012, Vol. 48 ›› Issue (7): 92-97.doi: 10.11707/j.1001-7488.20120715

• 论文 • 上一篇    下一篇

过量表达LAR3Bbchit1以提高毛白杨对叶枯病的抗性

黄艳, 刘虹, 袁丽, 贾之春, 罗克明   

  1. 西南大学生命科学学院 三峡库区生态环境教育部重点实验室 西南大学资源植物研究所 重庆 400715
  • 收稿日期:2011-07-23 修回日期:2011-12-21 出版日期:2012-07-25 发布日期:2012-07-25
  • 通讯作者: 罗克明

Overexpression of LAR3 and Bbchit1 Genes in Transgenic Populus tomentosa Raising the resistance to Alternaria alternata

Huang Yan, Liu Hong, Yuan Li, Jia Zhichun, Luo Keming   

  1. Institute of Resources Botany of Southwest University Key Laboratory of Eco-Environments of Three Gorges Reservoir Region of Ministry of Education School of Life Sciences, Southwest University Chongqing 400715
  • Received:2011-07-23 Revised:2011-12-21 Online:2012-07-25 Published:2012-07-25

摘要:

利用转基因技术将多种抗病基因共同转入毛白杨中以提高其抗性,从而获得毛白杨抗病新品种是目前解决杨树真菌病害的主要研究方向之一。本研究通过根癌农杆菌介导的二次遗传转化,将来源于球孢白僵菌几丁质酶基因Bbchit 1 转入过量表达无色花色素还原酶基因LAR 3 转基因毛白杨中,实时定量PCR显示Bbchit 1LAR3均能有效表达,离体抗病试验显示Bbchit1+LAR3 共表达转基因毛白杨细胞粗提液对杨树叶枯病菌具有明显抑制作用,进一步将叶枯病菌接种在转基因和非转基因毛白杨叶片上培养30天,转基因植株的感病面积均低于非转基因植株且 Bbchit1+LAR3共表达转基因株系抗病效果更明显。上述抗病试验结果表明:LAR3Bbchit1 在杨树中共表达可提高其对叶枯病的抗性。

关键词: LAR3, Bbchit1, 二次遗传转化, 毛白杨, 杨树叶枯病

Abstract:

Plant genetic engineering offers an alternative opportunity to enhance plant resistance to fungal pathogens. In this study, a chitinase gene (Bbchit 1 ) from Beauveria bassiana was introduced into transgenic plants of Chinese white poplar (Populus tomentosa) which constitutively overexpresses LAR 3 via Agrobacterium-mediated retransformation. The expression of Bbchit 1 and LAR 3 was detected in transgenic plants by real time-PCR. In vivo assays demonstrated that the transgenic poplar plants displayed a significant reduction in their disease symptoms after infected with Alternaria alternata compared to control plants. These results suggest that constitutive expression of LAR 3 and Bbchit 1 genes can be exploited to improve resistance to fungal pathogens in the poplar.

Key words: LAR 3, Bbchit 1, retransformation, Populus tomentosa, Alternaria alternata

中图分类号: