Effects of organic acids on the photosynthetic and antioxidant properties and accumulations of heavy metals of Melilotus officinalis grown in Cu tailing
Effects of organic acids on the photosynthetic and antioxidant properties and accumulations of heavy metals of Melilotus officinalis grown in Cu tailing
复制标题
有机酸对铜尾矿草木樨光合、抗氧化特性及重金属积累的影响
DOI：
10.1007/s11356-016-6920-x
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发表时间：
2016-09-01
影响因子：
5.8
通讯作者：
Fu, Jiajia
中科院分区：
文献类型：
--
作者：
Han, Yulin;Wu, Xue;Fu, Jiajia
研究了柠檬酸(CA)、醋酸(Ac)和乙二胺四乙酸(EDTA)对生长在铜矿尾矿上25d的草木犀苗的光合作用、抗氧化特性和某些重金属(HMS)积累的影响。结果表明，EDTA对药用植物光合作用细胞的形成有一定的抑制作用。EDTA浓度为2 mmol/kg时，光合色素含量分别比对照降低26%、40%和19%。地上部分和地下部分的脯氨酸含量随着EDTA水平的增加而增加。CA和Ac提高了地上部分的超氧化物歧化酶(SOD)和过氧化物酶(POD)活性，EDTA抑制地下部分的POD活性。CA的添加显著促进了药用植物的生长，而当EDTA浓度为2 mmol/kg时，生物量显著下降。0.5和2.0mmoL/kgEDTA处理的地上部铜含量分别达到175.50和265.17μg/g干重。AC和EDTA处理促进了Cd从根部向地上部分的转运。结果表明，药用植物是一种耐铜尾矿的植物，可用于修复受铜污染的环境，在植物修复中合理使用有机酸，尤其是EDTA，可以促进药用植物的生长和金属的积累。
The effect of citric acid (CA), acetic acid (Ac), and ethylene diamine tetraacetic acid (EDTA) on the photosynthetic and antioxidant properties and the accumulation of some heavy metals (HMs) of Melilotus officinalis seedling growing in Cu mine tailings for 25 days were studied. Results showed that the formation of photosynthesizing cells of M. officinalis was inhibited by EDTA at 2 mmol/kg. Photosynthetic pigment contents under EDTA of 2 mmol/kg were reduced by 26, 40, and 19 %, respectively, compared to the control. The proline contents in aboveground and underground parts increased as the level of EDTA was enhanced. CA and Ac enhanced the activities of superoxide dismutase (SOD) and peroxidase (POD) in the aboveground parts and EDTA inhibited the activity of POD in the underground parts. The addition of CA promoted significantly the growth of M. officinalis, while the biomass decreased significantly under 2 mmol/kg EDTA. Cu contents in the aboveground parts treated with 0.5 and 2.0 mmol/kg EDTA reached 175.50 and 265.17 μg/g dry weight, respectively. Ac and EDTA treatments promoted Cd to translocate from root to aboveground parts. The result indicated that M. officinalis was a tolerant species of Cu tailing and can be used to remediate Cu contaminated environment, and rationally utilization of organic acids, especially EDTA, in the phytoremediation can improve the growth and metals accumulation of M. officinalis.