Dynamic evolution of resistance gene analogs in the orthologous genomic regions of powdery mildew resistance gene MlIW170 in Triticum dicoccoides and Aegilops tauschii
| Autor: | Ping Lu, Qiuhong Wu, Yong-Qiang Gu, Naxin Huo, Shuhong Ouyang, Zhenzhong Wang, Deyun Zhang, Yongxing Chen, Jingzhong Xie, Yu Cui, Dong Zhang, Ming-Cheng Luo, Jan Dvorak, Zhiyong Liu, Yan Zhang, Qixin Sun, Jie Zhu, Ziji Liu, Yong Liang |
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| Rok vydání: | 2015 |
| Předmět: |
Genetic Markers
DNA Plant Genotype Genetic Linkage Blumeria graminis Locus (genetics) Genes Plant Genome Chromosomes Plant Evolution Molecular Ascomycota Gene duplication Genetics Aegilops tauschii Gene Phylogeny Triticum Disease Resistance Plant Diseases biology food and beverages General Medicine biology.organism_classification Physical Chromosome Mapping Ploidy Agronomy and Crop Science Powdery mildew Biotechnology |
| Zdroj: | TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik. 128(8) |
| ISSN: | 1432-2242 |
| Popis: | Rapid evolution of powdery mildew resistance gene MlIW170 orthologous genomic regions in wheat subgenomes. Wheat is one of the most important staple grain crops in the world and also an excellent model for plant ploidy evolution research with different ploidy levels from diploid to hexaploid. Powdery mildew disease caused by Blumeria graminis f.sp. tritici can result in significant loss in both grain yield and quality in wheat. In this study, the wheat powdery mildew resistance gene MlIW170 locus located at the Triticum dicoccoides chromosome 2B short arm was further characterized by constructing and sequencing a BAC-based physical map contig covering a 0.3 cM genetic distance region (880 kb) and developing additional markers to delineate the resistance gene within a 0.16 cM genetic interval (372 kb). Comparative analyses of the T. dicoccoides 2BS region with the orthologous Aegilops tauschii 2DS region showed great gene colinearity, including the structure organization of both types of RGA1/2-like and RPS2-like resistance genes. Comparative analyses with the orthologous regions from Brachypodium and rice genomes revealed considerable dynamic evolutionary changes that have re-shaped this MlIW170 region in the wheat genome, resulting in a high number of non-syntenic genes including resistance-related genes. This result might reflect the rapid evolution in R-gene regions. Phylogenetic analysis on these resistance-related gene sequences indicated the duplication of these genes in the MlIW170 region, occurred before the separation of the wheat B and D genomes. |
| Databáze: | OpenAIRE |
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