富营养化水体对水芹抗氧化系统和营养品质的影响

该试验以水芹(Oenanthe javanica DC.)为材料,通过浮床栽培技术,研究水芹的营养品质和抗氧化系统在富营养化水体中的变化,以明确富营养化水体对水芹生长和营养品质的影响,探讨利用水芹进行富营养化水体生态修复的可行性。结果表明:(1)在富营养化水体中生长30d后,水芹全株鲜重增长4.18~7.00倍,且在高浓度富营养化水体中生长的水芹生物量与正常栽培条件下无显著差异,可以在富营养化水体中正常生长。(2)在富营养化水体中,水芹体内SOD和POD活性均保持较高水平,MDA含量和电解质渗透率均维持在较低水平,表现出很强的抗氧化能力和对富营养化水体的适应性,避免了膜脂过氧化伤害。(3)在富营养化水体中,水芹Vc含量显著高于对照,可溶性糖含量与对照无差异,且亚硝酸盐含量远低于国家标准,其在该试验环境下营养品质较好,符合国家允许的食用标准。研究发现,水芹对富营养化水体具有较好的适应性,可以在富营养化水体中正常生长,且营养品质未受影响,能安全食用,可用于富营养化水体的生态修复。

Effect of Eutrophic Water Body on Antioxidant System and Nutritional Quality of Oenanthe javanica DC.

In this study, taking Oenanthe javanica DC. as experimental material, we used floating bed cultivation technique investigate the nutritional quality and antioxidant enzyme responses of O. javanica DC. in eutrophic water body, aiming to explore the feasibility of using O. javanica DC. in ecological remediation. The results showed that: (1) the fresh weight of O. javanica DC. increased 4.18-7.00 times after growing for 30 d in eutrophic water body, and there was no difference between high level eutrophic water body and the control, indicating that O. javanica DC. can grow normally in eutrophic water body. (2) Under the treatment of eutrophic water body, SOD and POD activities of O. javanica DC. maintained a high level, and MDA content and electrolyte leakage both remained at a low level, showing strong antioxidant capacity and adaptability to eutrophic water without the occurrence of lipid peroxidation. (3) In eutrophic water, compared with the control, Vc content of O. javanica DC. was significantly higher, soluble sugar content was not different from it, and nitrite content was far lower than the national standard, indicating that nutritional quality of O. javanica DC. was good in this study, and according with national edible standards. All of the above shows that O. javanica DC. has good adaptability to eutrophic water body. It can grow normally in eutrophic water with the nutritional quality not affected, be consumed safely and be used for ecological remediation of eutrophic water body.