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首页> 外文期刊>Limnology >Physiological mechanisms for plant distribution pattern: responses to flooding and drought in three wetland plants from Dongting Lake, China
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Physiological mechanisms for plant distribution pattern: responses to flooding and drought in three wetland plants from Dongting Lake, China

机译：植物分布格局的生理机制：来自洞庭湖的三种湿地植物对洪水和干旱的响应

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摘要

Both flooding and drought are important in determining plant distribution in wetlands. However, the roles of plant’s physiological response to flooding and drought in accounting for plant distribution are far from clear. To this end, three typical wetland plants with different distribution patterns (high-elevation species Miscanthus sacchariflorus, low-elevation species Carex brevicuspis and Polygonum hydropiper) in Dongting Lake were treated with three water levels (flooding 25 cm, control 0 cm, drought −25 cm), and relative growth rate (RGR), malondialdehyde (MDA) content, electrolyte leakage and proline content were investigated. The RGR of the three species decreased significantly in both flooding and drought treatments. Compared to the control, the RGR of M. sacchariflorus decreased more in the flooding treatment but less in the drought treatment compared to the other two species. The contents of MDA in the three species increased in both flooding and drought treatments, except for P. hydropiper in the flooding treatment. MDA contents increased more in M. sacchariflorus in the flooding treatment but less in the drought treatment compared to the other two species. Only M. sacchariflorus had a higher electrolyte leakage in the flooding treatment, and drought led to a higher electrolyte leakage in P. hydropiper and C. brevicuspis. Proline content increased 69.2, 66.7 and 39.6 % in P. hydropiper, C. brevicuspis and M. sacchariflorus in the flooding treatment, and increased 44.2, 13.0 and 45.3 % in the drought treatment, respectively. These results suggest that M. sacchariflorus has a higher tolerance to drought but a lower tolerance to flooding than do the other two species, which might be the intrinsic mechanisms accounting for their different distribution patterns.
机译：洪水和干旱对于确定湿地植物的分布都很重要。然而，植物对洪水和干旱的生理反应在解释植物分布方面的作用还不清楚。为此，对洞庭湖三种不同分布模式的典型湿地植物（高海拔物种芒草，低海拔物种Carex brevicuspis和何首乌）进行了三种水位处理（洪水25厘米，对照0厘米，干旱- 25厘米），并研究了相对生长速率（RGR），丙二醛（MDA）含量，电解质渗漏和脯氨酸含量。在洪水和干旱处理中，这三个物种的RGR显着下降。与对照组相比，与其他两个物种相比，在水淹处理中，糖蔗分枝杆菌的RGR下降更多，而在干旱处理中，下降幅度较小。在水淹和干旱处理中，这三种物种中的丙二醛含量都增加了，但在水淹处理中除了水hydro。与其他两个物种相比，水淹处理中糖精分枝杆菌的MDA含量增加，而干旱处理中MDA含量增加。在水淹处理中，只有糖摩氏菌具有较高的电解质渗漏，而干旱导致水hydro和淡水梭菌的电解质渗漏较高。在水淹处理中，水生P，短小隐孢子虫和糖醋栗的脯氨酸含量分别增加69.2％，66.7％和39.6％，而在干旱处理中脯氨酸含量分别增加44.2％，13.0％和45.3％。这些结果表明，与其他两个物种相比，酿酒酵母对干旱具有较高的耐受性，但对洪水的耐受性较低，这可能是解释其分布模式不同的内在机制。

著录项

  • 来源
    《Limnology》 |2013年第1期|71-76|共6页
  • 作者

    Feng Li; Xianyan Qin; Yonghong Xie; Xinsheng Chen; Jiayu Hu; Yinyin Liu; Zhiyong Hou;

  • 作者单位

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

    Graduate School of the Chinese Academy of Sciences">(3);

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences">(1);

    Dongting Lake Station for Wetland Ecosystem Research Institute of Subtropical Agriculture">(2);

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  • 正文语种 eng
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  • 关键词

    Flooding; Drought; MDA content; Electrolyte leakage; Proline content;

    机译：洪水;干旱;MDA内容;电解液泄漏;脯氨酸含量;

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