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| Effects of yttrium on growth and physiological characteristics and microcystin release of Microcystis aeruginosa under nitrogen and phosphorus deficiency |
| Received:April 05, 2017 |
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| KeyWord:yttrium;rare earth elements;Microcystis aeruginosa;microcystin-LR;physiological characteristics |
| Author Name | Affiliation | E-mail | | DU Jin-ge | College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | WANG Ying-jun | College of Environment, Sichuan Agricultural University, Chengdu 611130, China | wwyyjj1972@163.com | | WU Yang | College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | CHENG Jing-xing | College of Environment, Sichuan Agricultural University, Chengdu 611130, China | |
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| 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 algae are slow. In order to explore the effects of Y3+ on growth and physiological characteristics and microcystin release of Microcystis aeruginosa 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), peroxidase(POD), and malondialdehyde(MDA)]. The results showed that the growth of Microcystis aeruginosa exhibited the hormesis phenomenon 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. |
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