FLAVONOLS - PIGMENTS RESPONSIBLE FOR ULTRAVIOLET-ABSORPTION IN NECTAR GUIDE OF FLOWER
FLAVONOLS - PIGMENTS RESPONSIBLE FOR ULTRAVIOLET-ABSORPTION IN NECTAR GUIDE OF FLOWER
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DOI：
10.1126/science.177.4048.528
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发表时间：
1972-01-01
期刊：
影响因子：
56.9
通讯作者：
EISNER, T
中科院分区：
文献类型：
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作者：
THOMPSON, WR;ANESHANSLEY, D;EISNER, T
黑眼苏珊（Rudbeckia hirta）的花瓣含有3种黄酮醇苷（6，7-二甲氧基-3 ′，4 ′，5-三羟基黄酮-3-O-葡萄糖苷、展青霉素和槲皮素）。这些化合物在340至380纳米处显示出强烈的光谱吸收，其分布局限于花瓣基部，因此花瓣基部是紫外线吸收的。这种吸收紫外线的花瓣区域，被称为“花蜜向导”，我们看不见，但对降落在花朵上寻找食物的授粉昆虫来说是可见的，具有定向价值。这是第一次，紫外线吸收花蜜指南已被解释在化学术语。鉴于黄酮醇在花中的广泛存在，有人建议，这些色素专门用于划分可见的紫外花瓣图案和相关的昆虫。
The petals of the black-eyed susan (Compositae:Rudbeckia hirta) contain three flavonol glucosides (6,7-dimethoxy-3′,4′,5-trihydroxyflavone-3-O-glucoside, patulitrin, and quercetagetin). These compounds, which show intense spectral absorption at 340 to 380 nanometers, are restricted in distribution to the petal bases, which are ultraviolet absorbing as a result. Such ultraviolet-absorbing petal zones, known as "nectar guides," are invisible to us, but are visible and of orientation value to the pollinating insect that lands on the flower in search for food. This is the first time that ultraviolet absorption in a nectar guide has been interpreted in chemical terms. In view of the widespread occurrence of flavonols in flowers, it is suggested that these pigments serve specifically for demarcation of ultraviolet petal patterns visible and relevant to insects.