title: Transgenic wheat expressing Thinopyrum intermedium MYB transcription factor TiMYB2R-1 shows enhanced resistance to the take-all disease.
abstract: The disease take-all, caused by the fungus Gaeumannomyces graminis, is one of the most destructive root diseases of wheat worldwide. Breeding resistant cultivars is an effective way to protect wheat from take-all. However, little progress has been made in improving the disease resistance level in commercial wheat cultivars. MYB transcription factors play important roles in plant responses to environmental stresses. In this study, an R2R3-MYB gene in Thinopyrum intermedium, TiMYB2R-1, was cloned and characterized. The gene sequence includes two exons and an intron. The expression of TiMYB2R-1 was significantly induced following G. graminis infection. An in vitro DNA binding assay proved that TiMYB2R-1 protein could bind to the MYB-binding site cis-element ACI. Subcellular localization assays revealed that TiMYB2R-1 was localized in the nucleus. TiMYB2R-1 transgenic wheat plants were generated, characterized molecularly, and evaluated for take-all resistance. PCR and Southern blot analyses confirmed that TiMYB2R-1 was integrated into the genomes of three independent transgenic wheat lines by distinct patterns and the transgene was heritable. Reverse transcription-PCR and western blot analyses revealed that TiMYB2R-1 was highly expressed in the transgenic wheat lines. Based on disease response assessments for three successive generations, the significantly enhanced resistance to take-all was observed in the three TiMYB2R-1-overexpressing transgenic wheat lines. Furthermore, the transcript levels of at least six wheat defence-related genes were significantly elevated in the TiMYB2R-1 transgenic wheat lines. These results suggest that engineering and overexpression of TiMYB2R-1 may be used for improving take-all resistance of wheat and other cereal crops.
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement/Key Laboratory of Biology and Genetic Improvement of Triticeae Crops of the Agriculture Ministry, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: Lihua
authors.initials: L
authors.lastname: Yang
authors.forename: Xianyao
authors.initials: X
authors.lastname: Zhou
authors.forename: Miaoping
authors.initials: M
authors.lastname: Zhou
authors.forename: Yan
authors.initials: Y
authors.lastname: Lu
authors.forename: Lingjian
authors.initials: L
authors.lastname: Ma
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Ma
authors.forename: Zengyan
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D001203:Ascomycota / Q000378:metabolism*; D015139:Blotting, Southern; D060467:Disease Resistance / Q000235:genetics* / Q000502:physiology; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D030821:Plants, Genetically Modified / Q000235:genetics* / Q000502:physiology; D006109:Poaceae / Q000235:genetics* / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013347:Subcellular Fractions / Q000201:enzymology; D014157:Transcription Factors / Q000235:genetics* / Q000502:physiology; D014908:Triticum / Q000235:genetics* / Q000382:microbiology
chemical_list: D014157:Transcription Factors
keywords: Gaeumannomyces graminis var. tritici; MYB transcription factor; Thinopyrum intermedium; Triticum aestivum.; take-all resistance; transformation
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