Molecular characterization of a Thinopyrum intermedium Group 2 chromosome (2Ai-2) conferring resistance to barley yellow dwarf virus
文献类型: 外文期刊
第一作者: Zhang, ZY
作者: Zhang, ZY;Xin, ZY;Larkin, PJ
作者机构:
关键词: Thinopyrum intermedium;barley yellow dwarf virus (BYDV);genomic in situ hybridization (GISH);RFLP;SCAR;homoeologous group 2
期刊名称:GENOME ( 影响因子:2.166; 五年影响因子:2.474 )
ISSN: 0831-2796
年卷期: 2001 年 44 卷 6 期
页码:
收录情况: SCI
摘要: The wheat - Thinopyrum intermedium addition lines Z1 and Z2 carry 21 pairs of wheat chromosomes and one pair of Th. intermedium chromosomes (2Ai-2) conferring resistance to barley yellow dwarf virus (BYDV). GISH results using the genomic DNA of Pseudoroegneria strigosa (S genome) as the probe indicated that the 2Ai-2 chromosome in Z1 and Z2 is an S-J intercalary translocation. Most of the 2Ai-2 chromosome belongs to the S genome, except for about one third in the middle region of the long arm that belongs to the J genome. The results of detailed RFLP analyses confirmed that the 2Ai-2 chromosome is extensively homoeologous to wheat group 2 chromosomes. Some new RFLP markers specific to the 2Ai-2 chromosome were identified. A RAPD marker, OP-R16(340), specific to the 2Ai-2 chromosome, was screened. We converted the RAPD marker into a sequence-characterized amplified region (SCAR) marker (designated SC-R16). The study establishes the basis for selecting translocation lines with small segments of the 2Ai-2 chromosome and localizing the BYDV resistance gene when introgressed into a wheat background.
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