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Absorption and physiological responses of rape to excess Mn and Zn.

WANG Ying1, CHEN Wei-feng1**, HU Lin-lin2, LI Min2, SUN Bin1, LIU Bao-Xian1   

  1. (1College of Resource and Environment, Shandong Agricultural University, Taian 271018, Shandong, China; 2Chinese Research Academy of Environmental Sciences, Beijing 100012, China)
  • Online:2013-12-10 Published:2013-12-10

Abstract: A germination test and a pot experiment were conducted to study the effects of different concentrations Mn (0-1500 mg·kg-1) and Zn (0-1000 mg·kg-1) on the seed germination and the plant growth and quality as well as the absorption of these two elements by rape plant. Low concentrations Mn and Zn had little effects on the germination rate and germination potential, but slightly increased the plant chlorophyll and Vc contents and photosynthetic rate. High concentrations Mn (>100 mg·kg-1) and Zn (>50 mg·kg-1) stress inhibited the seed germination and the plant growth, and decreased the plant Vc content. The sensitivity of seed germination to Mn was higher than that to Zn. There existed significant positive correlations between the plant and soil Mn and Zn contents. When the soil Mn and Zn contents were >200 mg·kg-1 and >25 mg·kg-1, respectively, the Mn and Zn residues in plant exceeded the safety limit, being not suitable for eating.