<論文>べにばな頭状花の色調変化 : そのメカニズムについて
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概要
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Colour of Carthamus florets transits from bright-yellow to dark-red at the late phase of blooming. This is caused by carthamin accumulation in the flower florets. The red carthamin arises from orange-yellow precarthamin via oxidative reaction catalyzed by an enzyme which was tentatively named carthamin-synthesizing enzyme. This enzyme requires atmospheric oxygen for optimal reaction. It differs clearly from polyphenol oxidase (EC 1.14.18.1) and peroxidase (EC 1.11.1.7) judging from its catalytic properties. It shows no activities for hydrogenperoxide-guaiacol or for 3,4-dihydroxyphenylalanine. The enzyme is easily inactivated at a low concentra-tion of ortho-phosphate and enhanced by the presence of divalent manganese. The catalytically synthesized carthamin fixes with glucose units on cellulose distributed all over the surface of the floral tissues, through the processs of which a dramatic flower colour transition might be induced in the capitula of C. tinctorius.
- 北海道東海大学の論文
- 1990-03-20