Gene mutation site controlling rice grain high cadmium accumulation and application thereof

The invention discloses a gene mutation site controlling rice grain high cadmium accumulation and application thereof. The gene mutation site controlling rice grain high cadmium accumulation is located at the position of downstream +1138 nucleotide of a rice OsHMA3 gene initiation codon ATG, has A/C polymorphism, and is remarkably correlative with rice grain cadmium content. According to the gene mutation site, the cadmium content of rice grain with AA genotype is remarkably lower than that of rice grain with CC genotype. Due to the fact that the mutation site exists in japonica rice varieties, detection of the mutation site by means of a simple molecular marker has significant economic and social benefits for avoiding using risks of high cadmium accumulation varieties and assisting in breeding new low cadmium accumulation varieties. 本发明公开了个控制水稻籽粒高镉积累的基因突变位点及其应用。个控制水稻籽粒高镉积累的基因突变位点，所述突变位点位于水稻OsHMA3基因起始密码子ATG下游+1138位核苷酸，且存在A/C多态性，所述突变位点与水稻籽粒镉含量显著相关，该位点具有AA基因型的水稻籽粒镉含量显著低于具有CC基因型的水稻籽粒镉含量。由于所述突变位点存在于水稻粳稻品种中，采用简易分子