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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (12): 2178-2184.doi: 10.3724/SP.J.1006.2012.02178


Development and Characterization of Wheat Lines with Resistance to Take-All and Powdery Mildew Diseases

ZHU Xiu-Liang1,LI Zhao1,DU Li-Pu1,XU Hui-Jun1,YANG Li-Hua1,2,ZHUANG Hong-Tao1,MA Ling-Jian2,ZHANG Zeng-Yan1,*   

  1. 1 National Key Facility for Crop Gene Resources and Genetic Improvement / Key Laboratory of Crop Genetic and Breeding of Agriculture Ministry / Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2 College of Agronomy, Northwest A&F University, Yangling 712100, China
  • Received:2012-04-25 Revised:2012-07-05 Online:2012-12-12 Published:2012-09-10
  • Contact: 张增艳, E-mail: zhangzy@mail.caas.net.cn, Tel: 010-82108781


“Take-all”, primarily caused by Gaeumannomyces graminis var. tritici (Ggt), and powdery mildew, mainly caused by Blumeria graminis f. sp. tritici (Bgt), are important diseases of wheat (Triticum aestivum L.) worldwide. The wheat cultivar Yangmai 18 carrying a powdery mildewresistance gene Pm21, shows broad-spectrum resistance to powdery mildew. We have isolated a lipid transfer protein gene TaLTP5 from wheat. To study the role of TaLTP5 in wheat defense responses to the major pathogens of take-all, we introduced this gene intowheat cultivar Yangmai 18via bombarding the particle containing the TaLTP5 expressing vector pA25-TaLTP5. The TaLTP5 transgenic wheat plants from T0 to T3 generations were subjected to PCR, Southern blot, RT-PCR, and Q-RT-PCR analyses. We also evaluated the disease resistances of these TaLTP5 transgenic plants against inoculating Ggt and Bgt. The PCR and Southern blotting results showed that the alien TaLTP5 was transferred and integrated into the genomes of three transgenic wheat lines, and inherited stably in the transgenic wheat lines. The RT-PCR and Q-RT-PCR results indicated that the introduced TaLTP5 was over-expressed in transgenic wheat lines, which showed significantly-enhanced resistance to take-all, suggesting that TaLTP5 gene is involved in defense response to Ggt infection. In addition, the resistance of transgenic lines to powdery mildew was not influenced bythe introduced gene TaLTP5. Thus, TaLTP5 transgenic wheat Yangmai 18 exhibits resistance to both “Take-all” and powdery mildew.

Key words: Wheat lipid transfer protein, TaLTP5, Transgenic wheat, Take-all, Powdery mildew, Resistance

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