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首页> 外文期刊>Marine biology >Leaf reddening in the seagrass Thalassia testudinum in relation to anthocyanins, seagrass physiology and morphology, and plant protection
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Leaf reddening in the seagrass Thalassia testudinum in relation to anthocyanins, seagrass physiology and morphology, and plant protection

机译：与花青素，海草生理形态和植物保护有关的海草地中海藻中的叶片变红

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摘要

Numerous seagrass species growing in highlight environments develop red coloration in otherwise green leaves, yet the ecophysiology of leaf reddening in seagrasses is poorly understood. To increase our understanding of the process of leaf reddening in Thalassia testudinum found in the lower Florida Keys (USA), we identified the molecules responsible for red coloration in leaves and compared physiological, morphological, and growth attributes of entirely red-leafed shoots to entirely green-leafed shoots. We determined that four anthocyanin molecules are responsible for red coloration in leaves. In addition, we found that red leaves had higher concentrations of photoprotective pigments (anthocyanins and UV-absorbing compounds), higher effective quantum yields (△F/F_m) at midday, and were shorter, narrower, and weighed less than green leaves. No significant difference in growth rates was observed between red- and green-leafed shoots, but patches of red-leafed shoots had shorter canopy heights and smaller LAI compared to patches of green-leafed shoots. Our results demonstrate that leaf reddening in T. testudinum is caused by high concentrations of anthocyanins, is associated with physiological and morphological attributes, and acts as a sunscreen since red leaves were able to maintain high effective quantum yields at high light intensities.
机译：在高光环境中生长的许多海草物种在原本为绿色的叶子中会呈现红色，但人们对海草中的叶子变红的生态生理学知之甚少。为了加深我们对在佛罗里达下游群岛（美国）发现的地中海藻（Thalassia testudinum）叶片变红过程的了解，我们鉴定了导致叶片红色变色的分子，并将完全红叶的芽的生理，形态和生长特性与完全变红的芽进行了比较。绿叶芽。我们确定了四个花色苷分子负责叶片中的红色。此外，我们发现红叶在午间时具有较高浓度的光防护性颜料（花色素苷和紫外线吸收化合物），有效量子产率（△F / F_m），并且比绿叶更短，更窄且重量更轻。在红叶和绿叶芽之间没有观察到生长速率的显着差异，但是与绿叶芽的斑块相比，红叶芽的斑块具有更短的冠层高度和更小的LAI。我们的结果表明，T。testudinum中的叶子变红是由高浓度的花色苷引起的，与生理和形态学特征相关，并且由于在红光下能够在高光强度下保持高的有效量子产量而起到防晒作用。

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    《Marine biology》 |2011年第6期|p.1403-1416|共14页
  • 作者

    Alyssa B. Novak; Frederick T. Short;

  • 作者单位

    Department of Natural Resources and the Environment,Jackson Estuarine Laboratory, University of New Hampshire,85 Adams Point Road, Durham, NH 03824, USA;

    Department of Natural Resources and the Environment,Jackson Estuarine Laboratory, University of New Hampshire,85 Adams Point Road, Durham, NH 03824, USA;

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