SNPS在大豆等作物遗传及改良中的应用

单核苷酸多态性(singlenucleotidepolymorphism,SNP)是指DNA序列上的单个碱基变异,它具有分布广、多态信息量大、易于检测和统计分析等优点,被称为继RFLP和微卫星标记后的第三代基因遗传标记。单核苷酸多态性是等位基因间序列差异最为普遍的类型,可作为一种高通量的遗传标记。已建立PCR扩增目标序列及其产物测序和电子SNP(eSNP)等多种发现和检测SNP的方法。大豆等作物也已开展了SNP分析。一些栽培作物种质的多样件不断减少,其结果连锁不平衡(linkagedise鄄quilibrium,LD)增加,这有利于目的基因座上SNP单元型(haplotype)与表型的相关性分析。SNP已在作物基因作图及其整合、分子标记辅助育种和功能基因组学等领域展示了广泛的应用价值。

Application of Single Nucleotide Polymorphism in Soybean and Other Crop Genetics and Improvement

Single nucleotide polymorphism (SNP) refers to the change of single nucleotide in DNA sequence.Because of its high density in genomes and easy in detection and analysis statistically,SNP can be used in genetic linkage map construction and QTL mapping. Single nucleotide polymorphism( SNP) is the most common type of sequence difference between alleles,which can be used as a kind of high-throughput genetic marker. Several different routes have been developed to discover and identify SNP. These include the direct sequencing of PCR amplicons, electronic SNP(eSNP) and so on. SNP assays have been made in many crop species such as soybean. The elite germplasm of some crops have been narrowed in genetic diversity increasing the amount of linkage disequilibrium (LD) present and facilitating the association of SNP haplotypes at candidate gene loci with phenotypes. SNP analysis has been broadly used in the field of plant gene mapping, integration of genetic and physical maps. DNA marker-assisted breeding and functional genomics.