铜、镉及其复合胁迫对麻疯树幼苗生理生化特性的影响

为了研究铜(Cu)、镉(Cd)及其复合胁迫对麻疯树(Jatropha curcas Linn.)幼苗生理生化指标的影响,测定经Cu、Cd及其复合处理后麻疯树幼苗的丙二醛(MDA)含量、根系活力、叶绿素含量、细胞膜透性、可溶性蛋白质含量、可溶性糖含量、过氧化物酶(POD)和脯氨酸含量等的变化情况。研究表明,Cu和Cd的浓度分别为50-400和10-200 mg/L时,对麻疯树幼苗有一定的负效应,且两者的复合处理存在一定的拮抗作用。负效应表现为丙二醛、可溶性蛋白质和脯氨酸含量增加,相对电导率增大,根系活力下降,叶绿素和可溶性糖含量以及过氧化物酶活性下降,表明一定浓度的Cu、Cd会影响或改变麻疯树幼苗部分生理生化特征,对麻疯树幼苗的生长造成一定的危害;当Cu+Cd复合胁迫处理液浓度为(100+50) mg/L时,其对植物细胞中丙二醛产生最大的抑制作用,从而减轻植物细胞受损程度;当Cu+Cd复合胁迫处理液浓度为(50+10) mg/L时,其对植物根系活力的积极影响相对于参照组变化最为明显。适量Cu、Cd重金属含量对植物的生长和保护具有积极影响。

Effects of Copper, Cadmium and Their Combined Stress on the Physiological and Biochemical Characteristics of Jatropha curcas Linn.Seedlings

In order to study the effects of copper (Cu), cadmium (Cd) and their combined stress on the physiological and biochemical indexes of Jatropha curcas Linn. seedlings, changes in malondialdehyde content, root vitality, chlorophyll content, cell membrane permeability, soluble protein content, soluble sugar content, peroxidase (POD) and proline content after Cu, Cd and their combined treatments were determined. Studies showed that when the concentrations of Cu and Cd were 50-400 and 10-200 mg/L, respectively, there was a certain negative effect on J. curcas Linn. seedlings and the combined treatment of the two had a certain antagonistic effect. Negative effects were manifested by the increase in the content of malondialdehyde, soluble protein and proline, the increase in relative conductivity, the decrease in root activity, the decrease in chlorophyll and soluble sugar content and peroxidase activity, indicating that a certain concentration of Cu, Cd would affect or change some physiological and biochemical characteristics of J. curcas Linn., causing certain harm to the growth of J. curcas Linn. seedling. When the concentration of Cu+Cd compound stress treatment solution was (100+50) mg/L, it had the greatest inhibitory effect on malondialdehyde in plant cells, thereby delaying the damage of plant cells. When Cu+Cd compound stress treatment solution was (50+10) mg/L, its positive effect on plant root vitality changed most significantly compared to the reference group. The appropriate amount of Cu and Cd heavy metal content has a positive effect on the growth and protection of plants.