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| 模拟酸雨对薇甘菊种子萌发和幼苗生长的影响 | |
| 引用本文： | 曹欣,韩诗畴,吕欣,李志刚,范志伟.模拟酸雨对薇甘菊种子萌发和幼苗生长的影响[J].生态环境,2010,19(3):679-685. |
| 作者姓名： | 曹欣 韩诗畴 吕欣 李志刚 范志伟 |
| 作者单位： | 1. 中国科学院华南植物园,广东,广州,510650;中国科学院研究所院,北京,100049 2. 广东省昆虫研究所//广东省野生动物保护与利用公共实验室,广东,广州,510260 3. 中国热带农业科学院环境与植物保护研究所,海南,儋州,571737 |
| 基金项目： | 农业部热带农林有害生物入侵监测与控制重点开放实验室开放课题基金项目 |
| 摘 要： | 薇甘菊是入侵性杂草，已在我国华南地区及云南部分地区造成严重危害。我国华南地区同时也是强酸雨分布区域。采用不同pH值的模拟酸雨对薇甘菊种子及幼苗进行处理，测定其对种子萌发和幼苗生长的影响。测定了不同pH值下薇甘菊幼苗叶绿素含量、丙二醛含量、脯氨酸含量、超氧阴离子产生速率、超氧化物歧化酶和过氧化物酶活性。结果表明，薇甘菊种子具有较强的耐酸能力，pH≥3．5时均能正常萌发，pH≤3．0时不能萌发。不同pH值模拟酸雨对薇甘菊幼苗叶绿素含量影响不显著。随着模拟酸雨pH值下降，超氧阴离子产生速率上升，丙二醛含量、脯氨酸含量、超氧化物歧化酶活性和过氧化物酶活性呈先上升后下降。pH3．5时，丙二醛含量、脯氨酸含量、过氧化物酶活性均达最大值；pH4．0时超氧化物歧化酶活性达最大值。结果表明薇甘菊对华南地区酸雨胁迫表现出适应。 |
| 关 键 词： | 薇甘菊 模拟酸雨 叶绿素含量 膜脂过氧化 保护酶 |
Effects of simulated acid rain on seed germination and seedling growth of Mikania micrantha H.B.K |
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| CAO Xin,HAN Shichou,LV Xin,LI Zhigang,FAN Zhiwei.Effects of simulated acid rain on seed germination and seedling growth of Mikania micrantha H.B.K[J].Ecology and Environmnet,2010,19(3):679-685. | |
| Authors: | CAO Xin HAN Shichou LV Xin LI Zhigang FAN Zhiwei |
| Institution: | 1. South China Botanical Garden, Chinese Academy of Science, Guangzhou 510650, China; 2. Guangdong Entomological Institute//Guangdong Provincial Public Laboratory for Wild Animal Conservation and Management, Guangzbou 510260, China; 3. Graduate University of Chinese Academy of Science, Beijing 100049, China; 4. Enviroment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China) |
| Abstract: | Mikania micrantha H.B.K, a harmful exotic weed causing great harm in southern China and part of Yunnan. Southern China is also a acid precipitation area. Effects of simulated acid rain with different pH values on the germination and seedling growth of Mikania micrantha H.B.K were studied. The concentrations of chlorophyll, malonaldehyde (MDA), proline, O_2~-·production rate, and activity of superoxide dismutase (SOD) and peroxidase (POD) were determined. The results showed the seed can germinate over pH3.5 while cannot germinate below pH3.0. Simulated acid rain has no significant effect on concentrations of chlorophyll. While pH values of simulated acid rain fell, O_2~-·production rate rose and concentrations of malonaldehyde (MDA), proline, and activity of su-peroxide dismutase (SOD) and peroxidase (POD) rose first and then fell. Concentrations of malonaldehyde (MDA), proline, and activity of peroxidase (POD) reached the peak at pH3.5 while activity of superoxide dismutase (SOD) reached the peak at pH4.0. The result indicated that Mikania micrantha H.B.K can adapt the acid precipitation in Southern China. |
| Keywords: | Mikania micrantha H B K simulated acid rain chlorophyll content membrane lipid peroxidation cell defense enzyme |
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