PROBLEM TO BE SOLVED: To provide a new compound which is a dye of a rose provided with an ability to produce delphinidin by a plant, especially gene recombination, and a method for modifying a flower color of a plant such as a rose using a plant containing the dye, a portion of the same, and the compound.SOLUTION: To provide a new blue dye of rosacyanins having a large molecular weight, which is produced by causing a blue color gene (flavonoid 3,5-hydroxylase), does not exist in conventional rose variety plants, has an enhanced solubility improving effect due to presence of three hydroxy groups in a B ring, and is effective in exhibiting a blue color by being transported to vacuoles of petal cells. Also provided is a rose of the genus Rosa belonging to Rosaceae family having the blue dye in a plant body including flower petals.COPYRIGHT: (C)2015,JPO&INPIT【課題】植物、特に遺伝子組換えによりデルフィニジンを生産する能力が付与されたバラの色素である新規化合物、並びに該色素を含むバラなどの植物及びその部分並びに該化合物を用いて植物の花色を改変する方法の提供。【解決手段】青色遺伝子(フラボノイド3’,5’-水酸化酵素)を機能させることにより、従来のバラ品種植物中には存在しない、B環に水酸基を3個を有することによる溶解度向上効果がより高められ、花弁細胞の液胞に輸送されて青色を発揮する上で有効な、分子量が大きいロザシアニン類の新青色色素及び前記青色色素と花弁を含む植物体に含有するバラ科バラ属バラ。【選択図】なし
