农业环境科学学报2017，Vol.36Issue(8)：1500-1507,8.DOI:10.11654/jaes.2017-0495
钇(Y3+)对缺氮、缺磷胁迫下铜绿微囊藻生长和生理特性及藻毒素释放的影响
Effects of yttrium on growth and physiological characteristics and microcystin release of Microcystis aeruginosa under nitrogen and phosphorus deficiency
杜金戈 1王应军 1武阳 1成晶星1
作者信息
- 1. 四川农业大学环境学院,成都 611130
- 折叠
摘要
Abstract
Yttrium is a rare earth heavy metal element which has been gradually considered as an important metal pollutant because of its serious adverse effects on aquatic ecosystems. Under the condition of nitrogen and phosphorus deficiency, the growth and metabolism of al-gae are slow. In order to explore the effects of Y3+on growth and physiological characteristics and microcystin release of Microcystis aerugi-nosa under nitrogen and phosphorus deficiency, we measured the growth curves of Microcystis aeruginosa and the contents of chlorophyll a, soluble sugar, soluble protein, microcystin-LR;the activity of antioxidant enzymes[superoxide dismutase(SOD), catalase(CAT), peroxi-dase(POD), and malondialdehyde(MDA)]. The results showed that the growth of Microcystis aeruginosa exhibited the hormesis phe-nomenon as a result of Y3+. Low concentrations of Y3+(0.10~0.20 mg·L-1)could effectively improve the growth of Microcystis aeruginosa and enhance the activity of antioxidant enzymes under the condition of nitrogen and phosphorus deficiency, reducing the damage caused by the lack of nutrients. High concentrations of Y3+(0.50~2.00 mg·L-1)exacerbated the damage caused by the nutrient deficiency. Photosynthetic pigments, soluble sugar, and soluble protein content decreased gradually, and the degree of membrane lipid peroxidation and the content of microcystin-LR showed apparent upward trends with the increase of Y3+concentration.关键词
钇/稀土元素/铜绿微囊藻/微囊藻毒素-LR/生理特性Key words
yttrium/rare earth elements/Microcystis aeruginosa/microcystin-LR/physiological characteristics分类
资源环境引用本文复制引用
杜金戈,王应军,武阳,成晶星..钇(Y3+)对缺氮、缺磷胁迫下铜绿微囊藻生长和生理特性及藻毒素释放的影响[J].农业环境科学学报,2017,36(8):1500-1507,8.
