An object of the present inventioin is to search for a genehaving a novel function that can cause an increase or decrease inmaterial productivity, and particularly, fat and oil content. In thepresent invention, a chimeric protein obtained by fusing a transcriptionfactor consisting of a protein comprising an amino acid sequence shownin any of the even-numbered SEQ ID NOS: 1 to 158 and a functionalpeptide capable of converting an arbitrary transcription factor into atranscriptional repressor is expressed in a plant.
