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首页> 外文期刊>Russian Journal of Plant Physiology >Chemical composition of leaves and structure of photosynthetic apparatus in aquatic higher plants
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Chemical composition of leaves and structure of photosynthetic apparatus in aquatic higher plants

机译：水生高等植物叶片的化学组成和光合装置的结构

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摘要

Chemical composition of leaves (the content of carbon, nitrogen, nonstructural carbohydrates, organic acids, mineral substances, and water) and the structure of photosynthetic apparatus (specific leaf weight, cell volume, and the number of cells per unit leaf area) were investigated for 18 species of aquatic plants featuring various degrees of contact with aqueous environment and sediment. The rooted hydrophytes with floating leaves were characterized by comparatively high content of carbon and nitrogen (437 and 37 mg/g dry wt, respectively) and by low concentration of nonstructural carbohydrates, mineral substances, and organic acids (161, 54, and 60 mg/g dry wt, respectively). Unlike rooted plants, the free-floating nonrooted hydrophytes had characteristically higher content of nonstructural polysaccharides and mineral substances (by a factor of 1.3 and 1.6, respectively), while the leaf nitrogen content was 1.4 times lower, and the proportion of soluble carbohydrates in the total content of nonstructural carbohydrates was rather low (9%). The chemical composition of leaves in submerged rooted hydrophytes was intermediate between those for rooted hydrophytes with floating leaves and for nonrooted free plants. We found reliable positive correlations between the volume of photosynthesizing cells and the leaf content of organic acids (r = 0.69), as well as between specific leaf weight, the number of photosynthesizing cells per unit leaf area, and carbon content (r = 0.67 and r = 0.62, respectively). The content of nitrogen and nonstructural carbohydrates in hydrophytes was unrelated to structural characteristics of photosynthetic apparatus and depended on the absence or presence of plant attachment to the sediment. It is concluded that the structural traits of photosynthetic apparatus and the leaf chemical composition in hydrophytes featuring different degrees of plant contact with water and sediment reflect the specificity of plant adaptation to complex conditions of their habitats.
机译：研究了叶片的化学组成（碳，氮，非结构性碳水化合物，有机酸，矿物质和水的含量）和光合装置的结构（比叶重，细胞体积和每单位叶面积的细胞数）适用于18种水生植物，具有与水环境和沉积物不同程度的接触。带有漂浮叶子的生根水生植物的特征是碳和氮含量较高（分别为437和37 mg / g干重），并且非结构性碳水化合物，矿物质和有机酸的浓度较低（161、54和60 mg / g干重）。与有根植物不同，自由漂浮的无根水生植物通常具有较高的非结构性多糖和矿物质含量（分别为1.3和1.6倍），而叶氮含量低1.4倍，可溶性碳水化合物在植物中的比例较低。非结构性碳水化合物的总含量相当低（9％）。淹没的生根水生植物叶片的化学成分介于带浮叶的生根水生植物和非生根游离植物的叶片之间。我们发现光合作用细胞的体积与有机酸的叶子含量之间（r = 0.69），比叶重，单位叶面积的光合作用细胞数量和碳含量之间存在可靠的正相关性（r = 0.67和r = 0.62）。水生植物中氮和非结构性碳水化合物的含量与光合作用的结构特征无关，取决于植物是否附着于沉积物。结论是，植物与水和沉积物接触程度不同，水生植物的光合作用结构特征和叶片化学组成反映了植物适应其生境复杂条件的特异性。

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