镉胁迫对花生生长和矿质元素吸收的影响

Effects of Cadmium on Peanut Growth and Mineral Nutrient Uptake

以鲁花14为材料,采用盆栽的方法,设置0.10(CK)、3.24、7.35、8.38、18.80mg·kg-15种土壤镉浓度,研究了土壤镉胁迫对鲁花14生长和籽粒矿质元素吸收的影响。结果表明:随着镉浓度的增加,花生叶和茎的干重,荚果和籽粒重均呈现先增加后降低的趋势,这几个指标值均在镉浓度为3.24mg·kg-1时达到峰值,而镉浓度达到18.80mg·kg-1时显著低于对照。花生叶、茎、根和籽粒中的镉含量和镉积累量随镉浓度的增加呈持续上升的趋势,且不同土壤镉浓度间差异极显著。镉胁迫对花生籽粒矿质元素含量的影响不一致,随着镉浓度的增加,P元素呈不断下降的趋势,而K、Mg、Ca、Fe、Zn元素呈现先增加后降低的趋势。

A pot experiment was conducted using Luhua 14 to study the effects of cadmium on growth and mineral nutrient uptake of peanut cultivars. Five different cadmium concentrations were tested[0.10（CK）, 3.24, 7.35, 8.38 and 18.80 mg·kg^-1 of soil]. The results showed that the dry weight of leaves, shoots, legumes and grains from Luhua 14 first rose but dropped afterwards when increasing cadmium concentration. Maximum values were obtained for a soil cadmium concentration of 3.24 mg·kg^-1, while minimum values were obtained for a soil cadmium concentration of 18.80 mg·kg^-1. Cadmium accumulation in leaves, shoots, roots and grains from Luhua 14 increased proportionally with the cadmium concentration applied in soil. The results also showed that applying cadmium had different effects on the mineral nutrient concentration in grains. Phosphorus concentration was gradually reduced over increased cadmium concentrations, while concentrations of potassium, magnesium, calcium, iron and zinc first rose but dropped afterwards when increasing cadmium concentration.