Plant with reduced protein productivity in seeds, and method for producing same

A method for reducing protein productivity in seeds, comprising expressing, in a plant, a chimeric protein obtained by fusing a transcription factor and a functional peptide capable of converting an arbitrary transcription factor into a transcriptional repressor,

• wherein said transcription factor is a protein comprising the amino acid sequence of SEQ ID NO:
• 76, or a protein having transactivation activity and comprising the amino acid sequence of SEQ ID NO:
• 76 but in which 1-10 amino acids have been deleted, substituted, added, or inserted,
• and wherein the functional peptide has an amino acid sequence expressed by any one of the following formulae (1) to (8):
• (1) X1-Leu-Asp-Leu-X2-Leu-X3 (SEQ ID NO:
• 392 with deletion of 0-10 residues from the N-terminus) (where X1 denotes a set of 0 to 10 amino acid residues, X2 denotes Asn or Glu, and X3 denotes a set of at least 6 amino acid residues);
• (2) Y1-Phe-Asp-Leu-Asn-Y2-Y3 (SEQ ID NO:
• 393 with deletion of 0-10 residues from the N-terminus (where Y1 denotes a set of 0 to 10 amino acid residues, Y2 denotes Phe or Ile, and Y3 denotes a set of at least 6 amino acid residues);
• (3) Z1-Asp-Leu-Z2-Leu-Arg-Leu-Z3 (SEQ ID NO:
• 394 with deletion of 0-10 residues from the C-terminus and deletion of 0-2 residues from the N-terminus) (where Z1 denotes Leu, Asp-Leu, or Leu-Asp-Leu, Z2 denotes Glu, Gln, or Asp, and Z3 denotes a set of 0 to 10 amino acid residues);
• (4) Asp-Leu-Z4-Leu-Arg-Leu (where Z4 denotes Glu, Gln, or Asp) (residues 4-9 of SEQ ID NO.:
• 394);
• (5) α1-Leu-β1-Leu-γ1-Leu (SEQ ID NO:
• 395);
• (6) α1-Leu-β1-Leu-γ2-Leu (SEQ ID NO:
• 396);
• (7) α1-Leu-β2-Leu-Arg-Leu (SEQ ID NO:
• 397);
• and
• (8) α2-Leu-β1-Leu-Arg-Leu (SEQ ID NO:
• 398)
• (where α1 denotes Asp, Asn, Glu, Gln, Thr, or Ser;
• α2 denotes Asn, Glu, Gln, Thr, or Ser;
• β1 denotes Asp, Gln, Asn, Arg, Glu, Thr, Ser, or His;
• β2 denotes Asn, Arg, Thr, Ser, or His;
• γ1 denotes Arg, Gln, Asn, Thr, Ser, His, Lys, or Asp;
• and γ2 denotes Gln, Asn, Thr, Ser, His, Lys, or Asp, in formulae (5) to (8)).