According to the present invention, including any protein of the following (A) ~ a (C), flower induction agent is provided. Protein comprising an amino acid sequence as set forth in (A) SEQ ID NO: the amino acid sequence as set forth in (B) SEQ ID NO: flowering and comprises the amino acid sequence by deletion, substitution and / or one or several amino acid residues proteins with flower induction activity and comprising an amino acid sequence having at least 60% identity with a protein inducing activity, the amino acid sequence as set forth in (C) SEQ ID NO. The flower induction agent may be administered to the plants from the plant body.本発明により、以下の(A)~(C)のいずれかのタンパク質を含む、開花誘導剤が提供される。(A)配列番号2記載のアミノ酸配列を含むタンパク質、(B)配列番号2記載のアミノ酸配列において、1もしくは数個のアミノ酸が欠失、置換および/または付加されたアミノ酸配列を含み、かつ開花誘導活性を有するタンパク質、(C)配列番号2記載のアミノ酸配列と60%以上の同一性を有するアミノ酸配列を含み、かつ開花誘導活性を有するタンパク質。この開花誘導剤は、植物体外から植物体内に投与することができる。
