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土壤四环素污染对小白菜幼苗生长发育的生态毒性

ISSN号：0250-3301
期刊名称：《环境科学》
时间：0
分类：X171.5[环境科学与工程—环境科学]
作者机构：[1]中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳110016, [2]中国科学院研究生院,北京100049, [3]南开大学环境科学与工程学院,环境污染过程与基准教育部重点实验室,天津300071
相关基金：国家自然科学基金重点项目（40930739）; 中国博士后科学基金项目; 中国科学院沈阳应用生态研究所博士启动基金项目

关键词：四环素, 小白菜, 生态毒性, 生理指标, 抗氧化防御系统, tetracycline, Chinese white cabbage, ecotoxicological, physiological index, antioxidant defense system

中文摘要：

采用土培盆栽试验模拟研究了土壤四环素污染对小白菜幼苗生长发育的生态毒性.结果表明,1～100 mg/kg四环素暴露促进了小白菜的茎伸长,但抑制了小白菜的根伸长和鲜重.100 mg/kg四环素处理28 d后,小白菜根长抑制率达到36.0%,鲜重抑制率达到34.6%.随着四环素暴露时间的延长,100 mg/kg四环素处理的小白菜叶片中叶绿素含量显著低于其他浓度处理,其抑制率为21.7%～29.0%.四环素胁迫7 d后,小白菜幼苗中可溶性蛋白（SP）含量及丙二醛（MDA）含量无显著性变化,但随着暴露时间的延长,小白菜幼苗中SP含量显著下降,MDA含量则显著上升.1～100 mg/kg四环素对小白菜幼苗中SOD、POD和CAT酶活性均有不同程度的抑制作用;100 mg/kg四环素处理下,SOD、POD和CAT酶活性抑制率分别为33.9%～45.3%、33.8%～67.7%和29.6%～57.7%.试验结果表明,土壤四环素长期暴露对小白菜幼苗生长发育具有不良的生态毒性效应.

英文摘要：

The ecotoxicological effects of tetracycline（TC） on the early growth and seedlings development of Chinese white cabbage were investigated using the pot-culture method.The results showed that the stem elongation of the cabbages was promoted,while the root elongation and fresh weight of the cabbages were inhibited by 1-100 mg/kg TC.After a 28-day exposure,the inhibition rate of root elongation was up to 36.0% and that of fresh weight was up to 34.6% stressed by 100 mg/kg TC.With the exposure time of TC prolonged,the content of chlorophyll in leaves of the cabbage seedlings stressed by 100 mg/kg TC was significantly lower than that treated by other concentrations of TC,with the inhibition rate of chlorophyll was 21.7%-29.0%.After a 7-day exposure to TC,the content of soluble protein（SP） and malondialdehyde（MDA） in the cabbage seedlings changed insignificantly.With the exposure time of TC prolonged,the content of SP in the cabbage seedlings decreased significantly,while the content of MDA increased significantly.Moreover,the activity of SOD,POD and CAT in Chinese white cabbage seedlings was inhibited by 1-100 mg/kg TC.The inhibition rates of SOD,POD and CAT activity exposed to 100 mg/kg TC were 33.9%-45.3%,33.8%-67.7% and 29.6%-57.7%,respectively.It suggested that TC has ecotoxicological effects on Chinese white cabbage seedlings with a chronic exposure.