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首页> 外文OA文献 >Changes in morphological, photosynthetic and physiological responses of Mono Maple seedlings to enhanced UV-B and to nitrogen addition
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Changes in morphological, photosynthetic and physiological responses of Mono Maple seedlings to enhanced UV-B and to nitrogen addition

机译：枫树幼苗对增强UV-B和氮添加的形态，光合和生理响应的变化

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In the southeast of the Qinghai- Tibetan Plateau of China, Mono Maple is a common species in reforestation processes. The paper mainly investigated the changes in morphological, photosynthetic and physiological responses of Mono Maple seedlings to UV-B radiation, nitrogen supply and their combination. The experimental design included two levels of UV-B treatments (ambient UV-B, 11.02 KJ m(-2) day(-1); enhanced UV-B, 14.33 KJ m(-2) day(-1)) and two nitrogen levels (0; 20 g N m(-2) a(-1))-to determine whether the adverse effects of UV-B on plants are eased by nitrogen supply. Enhanced UV-B caused a marked decline in growth parameters, net photosynthetic rate, and photosynthetic pigments, whereas it induced an increase in reaction oxygen species (hydrogen peroxide accumulation and the rate of superoxide radical production) and malondialdehyde content. Enhance UV-B also induced an increase in antioxidant compounds of Mono Maple, such as UV-B absorbing compounds, proline content, and activities of antioxidant enzymes (peroxidase, superoxide dimutase and catalase). On the other hand, nitrogen supply caused an increase in some growth parameters, net photosynthetic rate, photosynthetic pigments and antioxidant compounds (peroxidase, proline content and UV-B absorbing compounds), and reduced the content of reaction oxygen species (H2O2 accumulation, the rate of O-2(-) production) and malondialdehyde content under ambient UV-B. However, under enhanced UV-B, nitrogen supply inhibited some growth parameters, and increased H2O2 accumulation, the rate of O-2(-) production and MDA content, though proline content, UV-B absorbing compounds and activities of POD and SOD increased. These results implied that enhanced UV-B brought harmful effects on Mono Maple seedlings and nitrogen supply made plants more sensitive to enhanced UV-B, though increased some antioxidant activity.
机译：在中国青海高原的东南部，莫诺枫是造林过程中的常见物种。本文主要研究了单株枫树幼苗对UV-B辐射，氮素供应及其组合的形态，光合和生理响应的变化。实验设计包括两个级别的UV-B处理（环境UV-B，11.02 KJ m（-2）天（-1）;增强型UV-B，14.33 KJ m（-2）天（-1））和两个氮水平（0; 20 g N m（-2）a（-1））-确定是否通过供应氮缓解UV-B对植物的不利影响。增强的UV-B引起生长参数，净光合速率和光合色素的显着下降，而却引起反应氧种类（过氧化氢的积累和超氧自由基的产生速率）和丙二醛含量的增加。增强UV-B还会引起Mono Maple的抗氧化剂化合物增加，例如UV-B吸收化合物，脯氨酸含量和抗氧化剂酶（过氧化物酶，超氧化物歧化酶和过氧化氢酶）的活性。另一方面，氮的供应增加了某些生长参数，净光合速率，光合色素和抗氧化剂（过氧化物酶，脯氨酸含量和吸收UV-B的化合物），并降低了反应氧的含量（H2O2积累，在环境UV-B下O-2（-）的生成速率和丙二醛含量。然而，在增强UV-B的条件下，氮供应抑制了一些生长参数，并增加了H2O2的积累，O-2（-）的产生速率和MDA含量，尽管脯氨酸含量，吸收UV-B的化合物以及POD和SOD活性增加。这些结果表明，增强的UV-B对Mono Maple幼苗产生了有害影响，而氮供应使植物对增强的UV-B更加敏感，尽管增加了一些抗氧化剂的活性。

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    Yao XQ; Liu Q;

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