硫酸铜对苋菜生长及食用安全性的影响

Growth and safety of Amaranthus mangostanus in response to bluestone

为了研究铜制剂是否会对蔬菜产量和品质产生影响，本研究以苋菜为材料，分析硫酸铜处理下苋菜种子萌发及幼苗生长和品质的变化。结果显示，硫酸铜的大量使用导致基质铜积累大幅提高。0.05～1.50 mmol/L硫酸铜处理对苋菜种子发芽率无显著影响，但其胚根和下胚轴的伸长受到了抑制，种子活力指数急剧下降。1.00～15.00 mmol/L硫酸铜处理下，苋菜幼苗没有表现出明显的毒性症状，但幼苗株高、叶面积、生物量、根系活力、光合色素含量、最大荧光、最大光化学效率和PSⅡ潜在活性均随着处理浓度的增加而降低；幼苗各器官铜含量及叶片丙二醛含量、电导率、O＋2含量、H2 O2含量、硝态氮含量和硝酸还原酶活性则是随着硫酸铜处理浓度的升高而升高。

To study the effects of copper agents on the yield and quality of vegetables, Amaranthus mangostanus was selected as materials to analyze the changes of seed germination, seedling growth, and quality with bluestone （ CuSO4 ） treatment. 0. 05-1. 50 mmol/L CuSO4 had no significant effect on the seed germination rate, but inhibited the radicle and hypocotyl elongations of A. mangostanus germinating seeds, and the seed vigor index dropped sharply. Seedlings under 1. 00-15. 00 mmol/L CuSO4 treatment showed no obvious toxic symptoms, but their heights, leaf areas, biomass, root ac-tivities, photosynthetic pigment contents, maximal fluorescence, maximal fluorescence efficiencies and PSⅡ potential ac-tivities decreased with the increase of CuSO4 concentration, and copper contents in different organs and malondialdehyde contents, electrical conductivities, O＋2 contents, H2 O2 contents, nitrate contents and nitrate reductase activities in leaves increased with the increase of CuSO4 concentration.