Single Nucleotide Polymorphism and Its Research and Application in Crops
Single nucleotide polymorphism(SNP)mainly refers to DNA sequence polymorphism caused by sin-gle nucleotide variation at genome level.As a kind of genetic marker,SNP is widely used in crop genetic analysis because of its high density,genetic stability and easy automation.Because SNP directly affects the expression of related genes and the change of protein structure in organisms,it leads to genetic variation,which has fundamental advantages for studying the changes of biological morphology or traits and adaptive evolution.In this study,the re-search and application progress of single nucleotide polymorphism(SNP),the third generation molecular marker te-chnology,in the development of plant gene map,the study of plant genetic diversity and genetic relationship,gene location and molecular marker-assisted selection were reviewed.