利用已知植物抗病基因编码氨基酸保守区域NBS-LRR(核苷酸结合位点-富亮氨酸区域)设计了42个简并引物组合,运用抗病基因类似物多态性(resistance gene analog polymorphism,RGAP)分子标记技术,对中国春、中国春-长穗偃麦草双二倍体及其...利用已知植物抗病基因编码氨基酸保守区域NBS-LRR(核苷酸结合位点-富亮氨酸区域)设计了42个简并引物组合,运用抗病基因类似物多态性(resistance gene analog polymorphism,RGAP)分子标记技术,对中国春、中国春-长穗偃麦草双二倍体及其附加系和代换系基因组DNA进行PCR扩增。结果表明,共有38对引物组合获得扩增产物,其中35对在普通小麦中国春、中国春-长穗偃麦草双二倍体中能扩增出多态性,平均每个引物组合扩增出38.5个片段。在普通小麦背景下,共获得275条长穗偃麦草E基因组多态性谱带,占扩增总谱带数的17.44%,揭示出在普通小麦背景下E基因组和普通小麦A、B、D基因组间的高丰度遗传变异。另外,利用RGAP分子标记技术,构建了一套完整的长穗偃麦草1E^7E染色体的特异RGAP标记。为小麦背景中长穗偃麦草外源遗传物质的快速检测提供了新途径。展开更多
Triticum aestivum-Hayaldia villosa translocation line V3 has shown effective all-stage resistance to the seven dominant pathotypes of Puccinia striiforms f.sp.tritici prevalent in China.To elucidate the genetic basis ...Triticum aestivum-Hayaldia villosa translocation line V3 has shown effective all-stage resistance to the seven dominant pathotypes of Puccinia striiforms f.sp.tritici prevalent in China.To elucidate the genetic basis of the resistance,the segregating populations were developed from the cross between V3 and susceptible genotype Mingxian 169,seedlings of the parents and F 2 progeny were tested with six prevalent pathotypes,including CYR29,CYR31,CYR32-6,CYR33,Sun11-4,and Sun11-11,F 1 plants and F 3 lines were also inoculated with Sun11-11 to confirm the result further.The genetic studied results showed that the resistance of V3 against CYR29 was conferred by two dominant genes,independently,one dominant gene and one recessive gene conferring independently or a single dominant gene to confer resistance to CYR31,two complementary dominant genes conferring resistance to both CYR32-6 and Sun11-4,two independently dominant genes or three dominant genes（two of the genes show cumulative effect） conferring resistance to CYR33,a single dominant gene for resistance to Sun11-11.Resistance gene analog polymorphism（RGAP） and simple-sequence repeat（SSR） techniques were used to identify molecular markers linked to the single dominant gene（temporarily designated as YrV3） for resistance to Sun11-11.A linkage map of 2 RGAP and 7 SSR markers was constructed for the dominant gene using data from 221 F 2 plants and their derived F 2：3 lines tested with Sun11-11 in the greenhouse.Amplification of the complete set of nulli-tetrasomic lines of Chinese Spring with a RGAP marker RG1 mapped the gene on the chromosome 1B,and then the linked 7 SSR markers located this gene on the long arm of chromosome 1B.The linkage map spanned a genetic distance of 25.0 cM,the SSR markers Xgwm124 and Xcfa2147 closely linked to YrV3 with genetic distances of 3.0 and 3.8 cM,respectively.Based on the linkage map,it concluded that the resistance gene YrV3 was located on chromosome arm 1BL.Given chromosomal location,the reaction patterns and pedigree analysis,YrV3 should be a novel gene for resistance to stripe rust in wheat.These closely linked markers should be useful in stacking genes from different sources for wheat breeding and diversification of resistance genes against stripe rust.展开更多
文摘利用已知植物抗病基因编码氨基酸保守区域NBS-LRR(核苷酸结合位点-富亮氨酸区域)设计了42个简并引物组合,运用抗病基因类似物多态性(resistance gene analog polymorphism,RGAP)分子标记技术,对中国春、中国春-长穗偃麦草双二倍体及其附加系和代换系基因组DNA进行PCR扩增。结果表明,共有38对引物组合获得扩增产物,其中35对在普通小麦中国春、中国春-长穗偃麦草双二倍体中能扩增出多态性,平均每个引物组合扩增出38.5个片段。在普通小麦背景下,共获得275条长穗偃麦草E基因组多态性谱带,占扩增总谱带数的17.44%,揭示出在普通小麦背景下E基因组和普通小麦A、B、D基因组间的高丰度遗传变异。另外,利用RGAP分子标记技术,构建了一套完整的长穗偃麦草1E^7E染色体的特异RGAP标记。为小麦背景中长穗偃麦草外源遗传物质的快速检测提供了新途径。
基金supported by the 111 Project from the Education Ministry of China(B07049)the Key Technologies R&D Program of China during the 11th Five-Year Plan period(2006BAD08A05)the project of the Toxicity Variation of Wheat Stripe Rust Pathogen and Demonstration of Integrated Management of Stripe Rust,China(200903035-02)
文摘Triticum aestivum-Hayaldia villosa translocation line V3 has shown effective all-stage resistance to the seven dominant pathotypes of Puccinia striiforms f.sp.tritici prevalent in China.To elucidate the genetic basis of the resistance,the segregating populations were developed from the cross between V3 and susceptible genotype Mingxian 169,seedlings of the parents and F 2 progeny were tested with six prevalent pathotypes,including CYR29,CYR31,CYR32-6,CYR33,Sun11-4,and Sun11-11,F 1 plants and F 3 lines were also inoculated with Sun11-11 to confirm the result further.The genetic studied results showed that the resistance of V3 against CYR29 was conferred by two dominant genes,independently,one dominant gene and one recessive gene conferring independently or a single dominant gene to confer resistance to CYR31,two complementary dominant genes conferring resistance to both CYR32-6 and Sun11-4,two independently dominant genes or three dominant genes（two of the genes show cumulative effect） conferring resistance to CYR33,a single dominant gene for resistance to Sun11-11.Resistance gene analog polymorphism（RGAP） and simple-sequence repeat（SSR） techniques were used to identify molecular markers linked to the single dominant gene（temporarily designated as YrV3） for resistance to Sun11-11.A linkage map of 2 RGAP and 7 SSR markers was constructed for the dominant gene using data from 221 F 2 plants and their derived F 2：3 lines tested with Sun11-11 in the greenhouse.Amplification of the complete set of nulli-tetrasomic lines of Chinese Spring with a RGAP marker RG1 mapped the gene on the chromosome 1B,and then the linked 7 SSR markers located this gene on the long arm of chromosome 1B.The linkage map spanned a genetic distance of 25.0 cM,the SSR markers Xgwm124 and Xcfa2147 closely linked to YrV3 with genetic distances of 3.0 and 3.8 cM,respectively.Based on the linkage map,it concluded that the resistance gene YrV3 was located on chromosome arm 1BL.Given chromosomal location,the reaction patterns and pedigree analysis,YrV3 should be a novel gene for resistance to stripe rust in wheat.These closely linked markers should be useful in stacking genes from different sources for wheat breeding and diversification of resistance genes against stripe rust.
