四种抗寒花卉对镉的生理响应和富集特征

以矮型四季菊、羽扇豆、欧报春和虞美人等冬春季常见花卉为试验材料,通过盆栽试验,研究了不同浓度Cd处理下4种花卉对Cd的生理响应和富集特征,探讨利用这4种花卉在冬春季寒冷时期修复Cd污染土壤的可行性,为提高植物修复技术的效率提供参考.结果 表明:(1)在所有Cd处理下,羽扇豆各部位生物量与对照均无差异;欧报春仅根系生物量...

Physiological responses and Cd accumulation characteristics in four cold-resistant flower species exposed to Cd polluted soil

A pot experiment was conducted to investigate the physiological responses and accumulation characteristics to cadmium(Cd)of Dendranthema morifolium,Lupinus luteus,Primula vulgaris and Papaver rhoeas.The aims of this study were to explore the feasibility of phytoremediation technology using these four ornamental flowers in winter and spring,and to provide reference for improving the efficiency of phytoremediation technology.The results showed that:(1)There was no difference in the biomass of L.luteus between Cd treatments and the control.The root biomass of P.vulgaris was significantly lower at 80 mg·kg^-1 Cd treatment than that of the control,being 74.51% of the control.The total biomass of D.morifolium and P.rhoeas was significantly lower than that of the control when the Cd concentration was higher than 10 and 40 mg·kg^-1,respectively,with the minimum value at 80 mg·kg^-1 Cd treatment,which were41.21% and 64.15% of the control,respectively.(2)Under Cd treatments,the activities of antioxidant enzymes in L.luteus were significantly higher than those in the control,the content of MDA was not changed,and the ability of scavenging ROS was the strongest and unharmed.The activity of antioxidant enzymes in P.vulgaris increased slightly,the content of MDA and REC increased slightly,and the ability of scavenging ROS was better.The capacity of scavenging ROS of D.morifolium and P.rhoeas was the lowest,which were suffered serious oxidative damage.(3)Under all Cd treatments,the allocation of Cd was higher in shoot than in root,the BCF and TF were greater than 1,and the maximum concentration and content of Cd in shoot were 136.20 mg·kg^-1 and 1118.20μg·plant^-1,respectively.TF in L.luteus,P.vulgaris and P.rhoeas was less than 1,Cd concentration and accumulation of shoot,BCF and TF were L.luteus>P.vulgaris and P.rhoeas.In summary,compared with P.vulgaris and P.rhoeas,D.morifolium has relatively poor tolerance to Cd,but it has strong absorption and transfer ability to Cd,which is suitable for the remediation of Cd polluted soil in winter and spring.L.luteus has strong tolerance,absorption and transfer ability to Cd,which is also suitable for the remediation of Cd polluted soils in winter and spring.