The Effect Of Zn²⁺ On The Growth And Antioxidant System Of Triticum Aestivum Under Cd²⁺ Stress

Cd²⁺ is environmental pollution and has toxic effect on organism.This experiment studied the growth and antioxidant effects of Triticum aestivum under different concentration of Cd²⁺ stress,which offered some evidence on studying the damage of Triticum aestivum under Cd²⁺ stress and how Triticum aestivum could resist the damage of Cd²⁺.Furthermore,we also researched the growth and antioxidant effects of Triticum aestivum under Zn²⁺-Cd²⁺ compounds stress, which offered some evidence on how Zn²⁺ alleviated the damage of Cd²⁺ .The results were as follows.1.The germination of Triticum aestivum under different concentration of single Zn²⁺ and Cd²⁺ and Zn²⁺-Cd²⁺ compounds:Certain concentration of Cd²⁺ and Zn²⁺ affected the germination remarkably.The germination and the seedling growth increased notably under 20mg/L Zn²⁺ and 1mg/L Cd²⁺;the germination ratio,germination energy,shoot length and root length decreased fastly and seedling growth inhibited distinctly with the increasing concentration of 50mg/L Zn²⁺ and Cd²⁺; the effect of Cd²⁺was higher than Zn²⁺. We could conclude that 20mg/L Zn²⁺ could promote the germination brought by Cd²⁺ stress.2.The growth and antioxidant effect of Triticum aestivum under different concentration of single Cd²⁺ when cultivating in water and soil respectively:1mg/L Cd²⁺and≦3mg/kg Cd²⁺ had no adversely effect on growth, but had promoted effect on biomass,chlorophyll ,root vigor,soluble protein , antioxidant enzyme and MDA content; Biomass ,chlorophyll ,root vigor,soluble protein ,antioxidant enzyme decreased and the growth inhibited seriously with the increasing concentration of Cd²⁺,furthermore, and the inhibition of leaf was more serious than root; the concentration of Cd²⁺ which inhibited the growth when cultivating in water promoted the growth when cultivating in soil, so we could conclude soil amortized the damage of Cd²⁺ strongly.3.The growth and antioxidant effect of Triticum aestivum under different concentration of Zn²⁺ when cultivating in water and soil respectively under Cd²⁺ stress:The growth was greatly inhibited,plant height,biomass,root vigor,antioxidant enzyme and the content of soluble protein decreased and the content of MDA increased under very high concentration of Zn²⁺ when cultivating in water and soil respectively under Cd²⁺ stress; and the growth was promoted;plant height,biomass,root vigor,antioxidant enzyme and the content of soluble protein increased and the content of MDA decreased under certain concentration of Zn²⁺ when cultivating in water and soil respectively under Cd²⁺ stress; so we could confer certain concentration of Zn²⁺ could alleviate the damage of Cd²⁺.In general, we can add certain concentration of Zn²⁺ to soil which cultivate Triticum aestivum under pollution of certain concentration of Cd²⁺,which will bring economic and economical advantage,and is an available method to improve and make use of heavy-metal polluted soil.