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Pointillist structural color in Pollia fruit

机译:Pollia水果中的点画派结构色

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摘要

Biological communication by means of structural color has existed for at least 500 million years. Structural color is commonly observed in the animal kingdom, but has been little studied in plants. We present a striking example of multilayer-based strong iridescent coloration in plants, in the fruit of Pollia condensate. The color is caused by Bragg reflection of helicoidally stacked cellulose micro-fibrils that form multilayers in the cell walls of the epicarp. We demonstrate that animals and plants have convergently evolved multilayer-based photonic structures to generate colors using entirely distinct materials. The bright blue coloration of this fruit is more intense than that of any previously described biological material. Uniquely in nature, the reflected color differs from cell to cell, as the layer thicknesses in the multilayer stack vary, giving the fruit a striking pixelated or pointillist appearance. Because the multilayers form with both helicoidicities, optical characterization reveals that the reflected light from every epidermal cell is polarized circularly either to the left or to the right, a feature that has never previously been observed in a single tissue.
机译:通过结构色彩进行生物通讯已经存在了至少5亿年。在动物界中通常观察到结构颜色,但是在植物中很少对其进行研究。我们在Pollia冷凝物的果实中提出了一个基于植物的基于多层的强虹彩着色的醒目示例。颜色是由螺旋状堆积的纤维素微纤维的布拉格反射引起的,该纤维素微纤维在果皮的细胞壁中形成多层。我们证明动物和植物已经聚合进化出基于多层的光子结构,以使用完全不同的材料生成颜色。这种水果的亮蓝色比以前描述的任何生物材料的亮蓝色都强烈。自然界中,反射的颜色在每个单元之间都是独特的,因为多层堆栈中的层厚度会有所不同,从而使水果具有醒目的像素化或点画质外观。由于多层膜具有两种螺旋结构,因此光学表征表明,每个表皮细胞的反射光都向左或向右圆偏振,这是以前在单个组织中从未观察到的特征。

著录项

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  • 作者单位

    Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom;

    Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB, United Kingdom;

    Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB, United Kingdom;

    Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom;

    Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom;

    Smithsonian Institution, National Museum of Natural History, Department of Botany, MRC 166, PO Box 37012, Washington, DC 20013-7012;

    Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom;

    Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom;

    Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    helicoidal self-assembly; mimicry; fruit dispersal;

    机译:螺旋自组装模仿;水果散布;

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