Response of the Growth of Vallisneria natans Under High Zn2+ Stress and Different NH4+/NO3- Ratios

文献类型： 外文期刊

第一作者： Wang, Baozhong

作者： Wang, Baozhong;Zhou, Lihua;Li, Susu;Wang, Baozhong;Zhang, Xia;Luo, Yanqing

作者机构：

关键词： Enzymes;Eutrophication;Physiological characteristics;Pollution;Submerged macrophytes

期刊名称：CLEAN-SOIL AIR WATER （ 影响因子：1.77； 五年影响因子：1.955 ）

ISSN： 1863-0650

年卷期： 2015 年 43 卷 12 期

页码：

收录情况： SCI

摘要： In order to evaluate the combined effects of Zn2+ and NH4+/NO3- stress, a cross experiment composed of different concentrations of Zn2+ (0, 2, 4, 8 mg L-1) and ratios of NH4+ and NO3- (1:6, 3:4, and 5:2) was conducted with Vallisneria natans under eutrophication (N = 4.667 mg L-1). Chlorophyll, protein, malondialdehyde (MDA), superoxide dismutase (SOD) activity, and ascorbate peroxidase (APX) activity of V. natans leaves were measured after cultivation for 7 days under stress of NH4+/NO3- and Zn2+. Variance analysis indicated that chlorophyll continuously decreased significantly with increasing Zn2+ concentration and NH4+/NO3- ratio, with the highest value at 0 mg L-1 Zn2+ and NH4+/NO3-, 1:6. However, MDA, soluble protein, SOD activity, and APX activity increased first and decreased subsequently, showing the greatest values at 2 mg L-1 Zn2+ and NH4+/NO3-, 1:6. Physiological responses of V. natans under high Zn2+ stress were obvious. A Zn2+ concentration of <2 mg L-1 could promote the growth of V. natans. Physiological functions of V. natans were partly affected under high NH4+/NO3- . However, it could promote the growth of V. natans at NH4+/NO3- <3:4 and a total nitrogen concentration of 4.667 mg L-1. Meanwhile, this study also showed that Zn2+ and NH4+/NO3- have a synergistic effect on V. natans.

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