SNP (Single Nucleotide Polymorphism) molecular marker relevant to rice seedling root length, and application thereof

The invention relates to the field of biological molecular markers, and concretely discloses an SNP (Single Nucleotide Polymorphism) molecular marker relevant to a rice seedling root length, and application thereof. The SNP molecular marker comes from an LOC_Os08g31580 gene, and is located at a rice No.8 chromosome 19, 859bp position with a base being C or T. The SNP molecular marker is remarkablyrelevant to the rice seedling root length; the seedling root length of a rice variety with a locus genotype being T/T is remarkably larger than that of a rice variety with a locus genotype being C/C.Meanwhile, a PCR (Polymerase Chain Reaction) primer is designed according to a SNP locus, and a nucleotide sequence of the primer is as shown in SEQ ID No.2 and SEQ ID No.3. The SNP molecular markerprovided by the invention can be used for improving a rice root system and breeding for drought resistance, so that the creation of a new drought-resistant rice germplasm and a process of a drought-resistant rice molecular bree