| 摘要: |
| 通过室内生态学对比实验，研究了龙须菜(Gracilaria lemaneiformis)在不同N、P营养盐浓度条件下对重金属Cd2+胁迫的生理响应。结果表明，环境中加入适当浓度的Ｎ、Ｐ营养盐(N 280 μmol/L、P 56 μmol/L)有利于提高龙须菜光合色素的含量和生长率，同时藻体内超氧化物歧化酶（SOD）和过氧化物酶（POD）酶活性增高，丙二醛（MDA）含量降低，从而增强了龙须菜对重金属Cd2+胁迫的耐受性；而N、P饥饿(Ｎ、Ｐ均为0 μ |
| 关键词: 龙须菜(Gracilaria lemaneiformis) Cd2+ N、P 生理响应 |
| DOI： |
| 分类号: |
| 基金项目:江苏省社会发展资助项目(BS2002016) |
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| Physiological response of Gracilaria lemaneiformi to stress of heavy metals Cd2+ under the conditions of different nitrogen and phosphorus |
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| Abstract: |
| The physiological response of Gracilaria lemaneiformi exposed to stress of heavy metals Cd2+ was studied under the conditions of different nitrogen and phosphorus and through the indoor ecological experiment. It was found that adding an appropriate concentration phosphate salt(56 μmol/L) or nitrogen salt(280 μmol/L) into the environment profited to improve the content of photosynthetic pigments of G. lemaneiformis and growth rate of the algae body at the same time, and increase their SOD and POD activities, decreased their MDA content, thus increasing their tolerance towards the heavy metal Cd2+ stress. On the status of nitrogen or phosphorus starvation (0 μmol/L) or excessive nutrient concentrations of phosphorus(216 μmol/L) or nitrogen(1 620 μmol/L), the G. lemaneiformis’s antioxidant capacity was declined, the harm degrees of lipid peroxidation and membrane system were increased, as well as the synthesis of photosynthetic pigments and the growth rate were inhibited. And the physiological adaptation of G. lemaneiformis to heavy metal Cd2+ stress is disadvantageeuas. |
| Key words: Gracilaria lemaneiformis Cd2+ nitrogen phosphorus physiological response |
