Dataset for: Growth and physiological responses in Myriophyllum spicatum L. exposed to linear alkylbenzene sulfonate

The exogenous organic pollutant linear alkylbenzene sulfonate (LAS) is frequently detected in water. Myriophyllum spicatum L., a submerged aquatic plant, is a popular choice for phytoremediation. The present study investigated the growth and physiological responses of M. spicatum to different concentrations of LAS (0, 0.1, 0.5, 1, 10, 50, 100, 500 mg/L) after 14 and 28 days (D) treatment. After 14 D, higher LAS doses (50-100 mg/L) significantly reduced the growth of M. spicatum as compared with the controls. Plants died at 500 mg/L LAS. The chlorophyll a and total chlorophyll contents exhibited a markedly increase at higher doses of LAS (10-100 mg/L). LAS significantly enhanced peroxidase (POD) activity at 50 mg/L and lowered superoxide dismutase (SOD) activity at 100 mg/L, while other indices showed no significant changes under LAS stress. After 28 D, no significant effect was observed for the growth of plants when exposed to LAS doses (0.1-100 mg/L), while plants died at 500 mg/L LAS. Compared to the controls. SOD activity was increased significantly at 0.1 mg/L LAS and maintained a same level with the controls at higher concentrations. POD activity in all LAS exposures was higher than the controls. Other indices for M. spicatum had no remarkable changes at 28 D. Our results indicated that the oxidative damage of M. spicatum caused by LAS stress after 28 D is obviously lower than 14 D.

外源性有机污染物直链烷基苯磺酸钠（linear alkylbenzene sulfonate, LAS）在水体中频繁检出。沉水植物穗花狐尾藻（Myriophyllum spicatum L.）是植物修复（phytoremediation）领域常用的受试物种。本研究考察了穗花狐尾藻在不同浓度LAS（0、0.1、0.5、1、10、50、100、500 mg/L）分别处理14天与28天后的生长与生理响应变化。处理14天后，相较于对照组，50~100 mg/L的高浓度LAS显著抑制了穗花狐尾藻的生长；当LAS浓度达到500 mg/L时，受试植株全部死亡。在10~100 mg/L的LAS胁迫下，穗花狐尾藻的叶绿素a与总叶绿素含量显著升高。LAS在50 mg/L浓度下显著提升了过氧化物酶（peroxidase, POD）活性，而在100 mg/L时降低了超氧化物歧化酶（superoxide dismutase, SOD）活性，其余生理指标在LAS胁迫下未出现显著变化。处理28天后，0.1~100 mg/L的LAS对穗花狐尾藻的生长无显著影响，但500 mg/L浓度下植株全部死亡。与对照组相比，0.1 mg/L的LAS显著提升了SOD活性，当浓度进一步升高时，SOD活性与对照组无显著差异；所有LAS处理组的POD活性均高于对照组。其余生理指标在28天处理周期内未出现显著变化。本研究结果显示，经28天LAS胁迫后，穗花狐尾藻所受的氧化损伤明显低于14天胁迫处理组。