PROBLEM TO BE SOLVED: To provide a novel plant-disease resistance inducer, and a plant-disease control method using the plant-disease resistance inducer.SOLUTION: A compound is a cyclic peptide composed of an amino acid sequence represented by formula (I), in which an α-amino group at an amino terminal of the amino acid sequence and a carboxyl group at a carboxyl terminal are coupled together through a peptide bond. Ser-Gly-Pro-Xaa1-Xaa2-Xaa3-Gln(1) (Xaa1 is Asn, Pro or Arg Xaa2 is Pro, Arg, His, Leu or Asn Xaa3 is His, Ile, Ser, Arg, Cys, Trp, Gln, Asn or Leu).SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】新規な植物病害抵抗性誘導剤及びこの植物病害抵抗性誘導剤を用いる植物病害防除方法の提供。【解決手段】次式(I)で表されるアミノ酸配列からなり、このアミノ酸配列のアミノ末端のα-アミノ基とカルボキシル末端のカルボキシル基がペプチド結合で連結された環状ペプチドである化合物。Ser-Gly-Pro-Xaa1-Xaa2-Xaa3-Gln(1)(Xaa1はAsn、Pro又はArg;Xaa2はPro、Arg、His、Leu又はAsn;Xaa3はHis、Ile、Ser、Arg、Cys、Trp、Gln、Asn又はLeu)【選択図】図1
