Effects of exogenous cadmium application on Ligusticum chuanxiong Lingzong germination and seedling growth
This study aimed to investigate the effects of various cadmium(Cd)concentrations on Ligusticum chuanxiong Ling-zong germination and seedling growth.The effect of Cd stress on the germination,seedling growth,physiological metabolism,and Cd content of L.chuanxiong Lingzong was investigated by applying different concentrations of CdCl2·2.5H2O(0,0.1,0.25,0.5,1,2 mmol/L)solution in a hydroponic experiment applying quartz sand as the substrate.According to the find-ings,plant height and root length were inhibited at higher Cd concentrations.The Cd content of the root,leaf,and stem node significantly aggrandized with increasing Cd concentrations,but plant height,root length,and fresh weight of leaf and root re-duced.Besides,antioxidant enzyme activities(catalase,peroxidase,peroxidase),non-enzymatic substance content(soluble protein,glutathione,proline),and malonaldehyde content increased first before decreasing.The study found that Cd concentra-tions ranging from 0.1 to 2.0 mmol/L had a substantial harmful effect on L.chuanxiong Lingzong germination and early seed-ling growth and that the toxic effect increased with increasing Cd stress concentration.The root of L.chuanxiong seedlings was the most sensitive organ to Cd stress.Under Cd stress,the physiological and biochemical indices of L.chuanxiong seedlings exhibited a low-promoting and high-suppressing hormesis.The results revealed that L.chuanxiong seedlings were able to de-crease membrane damage,and reactive oxygen species formation,mitigate the toxic effects and improve tolerance of Cd by boosting antioxidant enzyme activity and non-enzymatic material accumulation.
Ligusticum chuanxiong Lingzongcadmiumstressgerminationgrowth and development
万方数据
维普
