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采用水培试验,研究了镉(Cd)不同处理浓度对两种基因型小白菜(金夏王青梗菜和上海矮抗青)的生长及根系形态的影响。结果表明,随着Cd处理浓度的增加,两种基因型小白菜根系除直径无显著差异外,根系鲜重、长度、体积、表面积、根系活力均持续下降,且青梗菜的下降幅度显著高于矮抗青。随着镉处理浓度的增加,两种小白菜体内镉含量明显增加,与处理浓度呈显著正相关。当处理浓度大于Cd~(2+)0.25 mg/L,矮抗青地上部与根系镉含量超过青梗菜。两种小白菜地上部分鲜重和光合速率均呈先升后降的趋势,其中青梗菜的临界值为Cd~(2+)0.1 mg/L时,而矮抗青的临界值为Cd~(2+)0.25 m异/L。镉浓度为Cd~(2+)1.0 mg/L时,二品种气孔导度均有显著下降,而蒸腾速率变化相对较小。根系较地上部分对镉更为敏感。两种小白菜对镉浓度的反应虽然总体趋势一致,但青梗菜根系的生物量、形态参数、活力及光合参数的下降幅度显著高于矮抗青,表明矮抗青比青梗菜具有较强的耐镉特性,与种子萌发时的敏感性一致。
The hydroponic experiments were conducted to study the effects of different concentrations of cadmium on the growth and root morphology of two Chinese cabbage cultivars (Amorphophallus krylovirus and Shanghai dwarfing green). The results showed that with the increase of Cd concentration, the root weight, length, volume, surface area and root activity of the two genotypes of Chinese cabbage except the diameter had no significant difference, and the decreasing extent of the Chinese cabbage was significantly higher than that of the Chinese cabbage Short anti-green. With the increase of cadmium concentration, the content of cadmium in both Chinese cabbages increased significantly, which was positively correlated with the concentration of cadmium. When Cd concentration was higher than 0.25 mg / L, the cadmium content in the upper part and the root of the low resistance green land exceeded that of the Qinglei. The fresh weight and photosynthetic rate of two kinds of Chinese cabbage showed the trend of first increasing and then decreasing, the critical value of which was 0.1 mg / L Cd 2+, while the critical value of short anti-cyanobacteria was Cd ~ ( 2+) 0.25 m iso / L. When Cd concentration was 1.0 mg / L Cd 2+, the stomatal conductance of two cultivars decreased significantly while the transpiration rate changed relatively less. Roots are more sensitive to cadmium than aboveground parts. The responses of two Chinese cabbage to cadmium concentration were the same, but the decrease of biomass, morphological parameters, vigor and photosynthetic parameters in the root, Cadmium resistance, consistent with the sensitivity of the seed germination.