Change of color and components in sepals of chameleon hydrangea during maturation and senescence
Change of color and components in sepals of chameleon hydrangea during maturation and senescence
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DOI：
10.1016/j.phytochem.2008.02.024
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发表时间：
2008-12-01
期刊：
影响因子：
3.8
通讯作者：
Kondo, Tadao
中科院分区：
文献类型：
--
作者：
Yoshida, Kumi;Ito, Daisuke;Kondo, Tadao
变色龙绣球花的萼片颜色，绣球花 cv. Hovaria (TM) 'Homigo' 在成熟和衰老期间经历四个阶段的变化，从无色到蓝色，然后到绿色，最后到红色。为了阐明颜色变化的化学机制，我们分析了每个阶段萼片的成分。蓝色萼片含有 3-O-桑布二糖基-和 3-O-葡萄糖基飞燕草素以及三种辅助色素：5-O-对香豆酰基-、5-O-咖啡酰基-和 3-O-咖啡酰奎尼酸。糖基飞燕草素的含量向绿色阶段下降，同时叶绿体数量增加。在最后的红色阶段，两种3-O-糖基花青素几乎消失，另外两种花青素，3-O-桑布二糖基-和3-O-葡萄糖基花青素，数量增加。将 3-O-糖基花青素、辅助色素和 Al3+ 在 pH 3.0-3.5 的缓冲溶液中混合，得到的不是蓝色，而是红色溶液，与第四阶段的萼片颜色相同。高原地区的绣球花的萼片到了秋天也会变红，含有同样的花青素苷。绣球花在衰老过程中呈现红色是由于花青素生物合成的变化。 (c) 2008 Elsevier Ltd. 保留所有权利。
The sepal color of a chameleon hydrangea, Hydrangea macrophylla cv. Hovaria (TM) 'Homigo' changes in four stages, from colorless to blue, then to green, and finally to red, during maturation and the senescence periods. To clarify the chemical mechanism of the color change, we analyzed the components of the sepals at each stage. Blue-colored sepals contained 3-O-sambubiosyl- and 3 -O-glucosyldelphiniclin along with three co-pigments, 5-O-p-coumaroyl-, 5-O-caffeoyl- and 3-O-caffeoylquinic acids. The contents of glycosyldelphiniclins decreased toward the green-colored stage, with a coincident increase in the number of chloroplasts. During the last red colored stage, the two species of 3-O-glycosyldelphinidin almost disappeared, and another two anthocyanins, 3-O-sambubiosyl- and 3-O-glucosylcyanidin, increased in amounts. Mixing of 3-O-glycosylcyanidins, co-pigments, and Al3+ in a buffered solution at pH 3.0-3.5 gave not a blue, but a red, colored solution that was the same as that of the sepal color of the 4th stage. Sepals of hydrangea grown in an highland area also turned red in autumn, and contained the same cyanidin glycosides. The red coloration of the hydrangea during senescence was due to a change in anthocyanin biosynthesis. (c) 2008 Elsevier Ltd. All rights reserved.