The present invention relates to glycerol-3-phosphate acyltransferases polynucleotides encoding the same etc. The present invention provides a polynucleotide comprising the nucleotide sequence of e.g. SEQ ID NO: 1 or 4 a polynucleotide encoding a protein consisting of the amino acid sequence of SEQ ID NO: 2 an expression vector and transformant comprising the polynucleotide a method for producing food etc. using the transformant food etc. produced by the method and so on.