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以二年生三七为试验材料,水培条件下研究了镉胁迫(0,2.5,5,10μmol·L-1)对三七抗氧化酶系统和光合参数的影响及三七对镉的吸收分配规律。结果表明:2.5μmol·L-1镉处理可诱导SOD,POD,APX等酶活性的升高,10μmol·L-1镉处理则对SOD,POD,APX,CAT均产生抑制作用;镉处理对三七各部位CAT活性均具有抑制作用;三七净光合速率,蒸腾速率,气孔导度均随镉处理浓度的升高而降低,胞间CO2浓度则呈先下降后上升的趋势;三七各器官镉含量表现为须根>剪口>主根>叶片>茎;叶,茎,剪口,须根,主根镉富集系数均随镉处理浓度的升高而降低;各器官中镉含量与迁移系数均随镉处理浓度的升高而上升。综上所述,镉胁迫可对三七抗氧化酶系统和光合系统产生影响,三七对镉具有富集作用,应合理选择三七种植基地以减少对镉的吸收,合理选取三七入药部位,以降低镉摄入风险。
Under the conditions of hydroponics, the effects of cadmium stress (0, 2.5, 5, 10 and 10 μmol·L -1) on the antioxidant enzyme system and photosynthetic parameters of Panax notoginseng and the absorption and distribution of cadmium . The results showed that: 2.5μmol·L-1 cadmium treatment can induce the activity of SOD, POD, APX and other enzymes increased, 10μmol·L-1 cadmium treatment SOD, POD, APX, CAT were inhibited; cadmium treatment of three CAT activity of seven parts all inhibited. The net photosynthetic rate, transpiration rate and stomatal conductance of Panax notoginseng decreased with the increase of cadmium concentration, and the intercellular CO2 concentration decreased first and then increased. Cadmium content showed fibrous roots> notch> main root> leaf> stem; and the accumulation of cadmium in leaves, stems, scissors, fibrous roots and main roots decreased with the increase of cadmium concentration; Cadmium concentration increased and increased. In summary, cadmium stress may have an impact on the antioxidant system and the photosynthetic system of Panax notoginseng, and Panax notoginseng has an enrichment effect on cadmium. The notoginseng plantation should be selected reasonably to reduce the cadmium absorption, , To reduce the risk of cadmium intake.