Application of low-affinity cationic transporter gene OsLCT3 in plant breeding regulation

The invention discloses an application of a low-affinity cation transporter gene OsLCT3 in regulation and control of plant breeding. Belongs to the field of plant genetic engineering. The invention relates to application of a low-affinity cation transporter gene OsLCT3 in plant breeding regulation and control. The amino acid sequence of a protein encoded by the low-affinity cation transporter gene OsLCT3 is shown as SEQ ID No: 4. According to the invention, the low-affinity cation transporter gene OsLCT3 is knocked out in rice, so that the transfer of Cd from the root to the stem leaf in the knockout plant under Cd stress is obviously reduced compared with that of a wild plant, and the content of Cd in grains in the knockout plant planted in Cd-polluted soil is obviously reduced compared with that of the wild plant; however, the content of essential elements in the grains and the yield of the rice are not negatively influenced, so that a new candidate gene resource is provided for creating safe rice with low