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A Novel Wheat-Dasypyrum breviaristatum Substitution Line with Stripe Rust Resistance

文献类型： 外文期刊

作者： Li, Guang-Rong 1 ; Zhao, Jin-Mei 1 ; Li, Dong-Hai 1 ; Yang, En-Nian 2 ; Huang, Yu-Feng 3 ; Liu, Cheng 1 ; Yang, Zu-Jun 1 ;

作者机构： 1.Univ Elect Sci & Technol China, Sch Life Sci & Technol, Chengdu 610054, Peoples R China

2.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu, Peoples R China

3.Ananciji Hlth Ctr, Chengdu, Peoples R China

期刊名称：CYTOGENETIC AND GENOME RESEARCH （ 影响因子：1.636； 五年影响因子：1.943 ）

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收录情况： SCI

摘要： The introduction of genetic variation from wild and cultivated Triticeae species has been a long-standing approach for wheat improvement. Dasypyrum breviaristatum species harbor novel and agronomically important genes for resistance against multi-fungal diseases. The development of new wheat-D. breviaristatum introgression lines offers chances for the identification of stripe rust resistance gene(s). A wheat line, D11-5, was selected from a cross between wheat line MY11 and wheat-D. breviaristatum partial amphiploid TDH-2. It was characterized by FISH and PCR-based molecular markers. Chromosome counting revealed that the D11-5 line shows a hexaploid set of 2n = 6x = 42 chromosomes. FISH analysis using the Dasypyrum repetitive sequence pDb12H as a probe demonstrated that D11-5 contained a pair of D. breviaristatum chromosomes, while FISH with wheat D-genomic repetitive sequences revealed that the chromosome 2D was absent in D11-5. The functional molecular markers confirmed that the introduced D. breviaristatum chromosomes belong to the homoeologous group 2, indicating that D11-5 was a 2V(b) (2D) disomic substitution line. Field resistance showed that the introduced D. breviaristatum chromosomes 2V(b) were responsible for the stripe rust resistance at the adult plant stage. FISH, C-banding, and PCR-based molecular marker analysis indicated that the chromosome 2V(b) of D. breviaristatum was completely different from the chromosome 2V of D. villosum. The identified wheat-D. breviaristatum chromosome substitution line D11-5 may be applied to produce agronomically desirable stripe rust resistance germplasm

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