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首页> 外文期刊>Journal of Experimental Botany >Effect of anthocyanins, carotenoids, and flavonols on chlorophyll fluorescence excitation spectra in apple fruit: signature analysis, assessment, modelling, and relevance to photoprotection
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Effect of anthocyanins, carotenoids, and flavonols on chlorophyll fluorescence excitation spectra in apple fruit: signature analysis, assessment, modelling, and relevance to photoprotection

机译：花青素，类胡萝卜素和黄酮醇对苹果果实叶绿素荧光激发光谱的影响：特征分析，评估，建模以及与光保护的相关性

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摘要

Whole apple fruit (Malus domestica Borkh.) widely differing in pigment content and composition has been examined by recording its chlorophyll fluorescence excitation and diffuse reflection spectra in the visible and near UV regions. Spectral bands sensitive to the pigment concentration have been identified, and linear models for non-destructive assessment of anthocyanins, carotenoids, and flavonols via chlorophyll fluorescence measurements are put forward. The adaptation of apple fruit to high light stress involves accumulation of these protective pigments, which absorb solar radiation in broad spectral ranges extending from UV to the green and, in anthocyanin-containing cultivars, to the red regions of the spectrum. In ripening apples the protective effect in the blue region could be attributed to extrathylakoid carotenoids. A simple model, which allows the simulation of chlorophyll fluorescence excitation spectra in the visible range and a quantitative evaluation of competitive absorption by anthocyanins, carotenoids, and flavonols, is described. Evidence is presented to support the view that anthocyanins, carotenoids, and flavonols play, in fruit with low-to-moderate pigment content, the role of internal traps (insofar as they compete with chlorophylls for the absorption of incident light in specific spectral bands), affecting thereby the shape of the chlorophyll fluorescence excitation spectrum.
机译：通过记录其在可见光和近紫外区域的叶绿素荧光激发和漫反射光谱，研究了色素含量和组成差异很大的整个苹果果实（Malus domestica Borkh。）。已经确定了对颜料浓度敏感的光谱带，并提出了通过叶绿素荧光测量对花色苷，类胡萝卜素和黄酮醇进行非破坏性评估的线性模型。苹果果实对高光胁迫的适应性涉及这些保护性颜料的积累，这些保护性颜料吸收从UV到绿色，在含花青素的品种中到红色区域的宽光谱范围内的太阳辐射。在成熟的苹果中，蓝色区域的保护作用可能归因于类囊外类胡萝卜素。描述了一个简单的模型，该模型允许在可见光范围内模拟叶绿素荧光激发光谱，并定量评估花色苷，类胡萝卜素和黄酮醇的竞争吸收。证据支持花青素，类胡萝卜素和黄酮醇在色素含量低至中等的水果中发挥内部陷阱的作用（因为它们与叶绿素竞争特定光谱带中入射光的吸收） ，从而影响叶绿素荧光激发光谱的形状。

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  • 来源
    《Journal of Experimental Botany》 |2008年第2期|p.349-359|共11页
  • 作者

    Mark N. Merzlyak1* Thor Bernt Melø2 and K. Razi Naqvi2;

  • 作者单位

    1Department of Physiology of Microorganisms, Faculty of Biology, Moscow State University, 119991, GSP-2 Moscow, Russia 2Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim, N-7491, Norway;

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