PROBLEM TO BE SOLVED: To provide nucleic acid molecules encoding a starch granule-bound protein from rice as well as methods and recombinant DNA molecules for the production of transgenic plant cells and plants synthesizing a modified starch. SOLUTION: There are provided: the nucleic acid molecules encoding an R1-protein; their respective complementary strands; an R1-gene naturally present in rice; and the methods for the production of plants, which includes a step of introducing polynucleotides encoding the R1-protein into plant cells and a step of producing plants from the cells transformed thereby. COPYRIGHT: (C)2011,JPO&INPIT