Effects of manganese fertilizer and zinc fertilizer seed coating on cadmium reduction in peanut
Peanut has a fairly strong ability of accumulating cadmium(Cd)from the soil,and the problem of Cd content in peanut exceeding the food safety standard is serious in some regions of China.Seed coating is a common technology to control diseases and insect pests and enhance stress resistance in peanut production,but the research of using seed coating technology to control Cd pollution risk in peanut producing areas has not been reported.This study first screened out three suitable concentrations of manganese(Mn)and zinc(Zn)coating agents by seed germi-nation test,and then further screened out the concentration of coating agent with the best Cd reduction effect by pot experiment.The effect of Mn fertilizer and Zn fertilizer seed coating on Cd transfer within peanut plant in Cd-con-taminated soil was further explored through pot experiment.The results of seed germination test showed that the seed coating treatment with low to moderate concentrations of Mn and Zn fertilizer did not affect the seed germina-tion rate and could promote the root length,while the excessive concentration could obviously inhibit the seed germi-nation.The results of pot experiment showed that among the seed coating agents of Mn and Zn,3%Mn fertilizer coating agent(Mn3)and 2%Zn fertilizer coating agent(Zn2)had the most significant effect on reducing Cd in pea-nut seeds,with the Cd reduction rates reaching 19.0%and 24.1%respectively,and Zn2 had the better Cd reduction effect.Compared with the control,the Cd bioaccumulation factor of roots in the two treatments decreased significant-ly,the Cd translocation factor(TF)from roots to shoots increased significantly,the TF from shoots to seeds de-creased,while the TF from roots to seeds had no obvious change.Compared with the control,the absorption of Cd in peanut plants under Mn3 and Zn2 treatments decreased by 9.18%and 13.6%.There was a significant negative cor-relation between the contents of Cd in peanut seeds and roots and the contents of Mn and Zn in roots.Seed coating with Mn and Zn can reduce the Cd content in peanut seeds by inhibiting the absorption of Cd by roots and the trans-port of Cd within peanut plant.This study put forward the technology of reducing Cd content in peanut by seed coat-ing,which provided a new method for risk control of Cd pollution in peanut producing areas.
国家科技期刊平台
NSTL
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