Zn和Cd胁迫作用对长梗白菜形态和生理性能的生态毒理影响

本文以不同Cd、Zn浓度胁迫下的长梗白菜为研究对象,采用盆栽实验,分析了Cd和Zn胁迫下长梗白菜形态参数(重量、长度、表面积、叶的分形维数)、生理性能的影响以及从土壤中提取Cd和Zn的能力.结果 表明,Cd、Zn胁迫对长梗白菜的生长具有"低促高抑"效应,且共同胁迫对生长的影响大于单一胁迫.在0.6 mg·kg-1 Cd...

Ecotoxicological effects of Zn and Cd stress on the morphology and physiological properties of long-stalk cabbage

In this paper,the long-stalk cabbage under different Cd and Zn concentration stresses was used as the research object.Potted experiments were used to analyze the morphological parameters(length,weight,surface area,leaf fractal dimension)and physiological properties of long-stemmed cabbage under Cd and Zn stress.Influence and the ability to extract Cd and Zn from the soil.The results showed that:Cd and Zn stress have a“low-promoting high-inhibition”effect on the growth of long-stemmed cabbage,and the common stress has a greater impact on the growth than a single stress.Under the simultaneous stress of 0.6 mg·kg^-1 Cd and 250 mg·kg^-1 Zn,the leaf and stem biomass increased by 93.27%and 155.84%,respectively;when Cd and Zn were simultaneously stressed,the concentration increased to 0.9 mg·kg^-1 and 350,respectively mg·kg^-1,the leaf and stem biomass decreased by 63%and 66.23%,respectively.As the concentration of heavy metals increases,the activity of peroxidase(POD)in plants first increases and then decreases.Compared with the control group,POD activity increased by 64.17%under 150 mg·kg^-1 Zn stress,and decreased by 31.50%under 350 mg·kg^-1 Zn stress.The treatment of heavy metals resulted in the increase of CAT activity in long-stemmed cabbage.The maximum activity of 99.74 U·g^-1 was reached under the simultaneous stress of 0.9 mg·kg^-1 Cd and 350 mg·kg^-1 Zn.The combined treatment of Cd and Zn significantly reduced the content of malondialdehyde(MDA).The addition of Zn promotes the absorption of Cd,and the Cd content in the root can reach 0.21 mg·kg^-1.The research results can provide scientific support for the prevention and control of soil heavy metal compound pollution and the improvement of vegetable quality.