the invention discloses a gene DU1, which controls straight-chain starch content of rice endosperm in the rice beauty-water 11, wherein the gene ribonucleotide sequence is selected from (1) the ribonucleotide sequence of amino acid sequence of coded SEQ ID NO: 2; (2) the ribonucleotide sequence to control plant organ starch composition and rice endosperm straight-chain starch content simultaneously. the invention also provides protein to control straight-chain starch content of rice endosperm and plant expressive carrier of gene as well as plant cultivating method, which comprises the following steps: converting the gene of expressive carrier into plant cell; cultivating the converted plant cell into plant. |