Toxic Effects of Complex Heavy Metal Stress on Wheat
To investigate the toxic effect of complex heavy metal stress on wheat,we cultured wheat in water and ZnSO4·7H2 O,FeCl3,CuSO4·5H2 O and MnSO4 were added into the aqueous solution.Three different concentrations of mixed solutions(low concentration G1,medium concentration G2 and high concentration G3)were prepared to simulate the heavy metal pollution environment.The study investigated the growth and develop-ment of wheat seedlings,as well as the enrichment and transport of zinc(Zn),iron(Fe),copper(Cu),and manganese(Mn)in wheat seedlings under the influence of complex heavy metal stress.The results showed that the morphological characteristics of wheat seedling growth showed that with the increase of the concentration of complex heavy metals,the leaves and roots of wheat seedlings became stronger and greener than the control group.Especially,the wheat seedlings cultured in G2 medium concentration had the strongest leaves and roots and the greenest leaves.After that,the plant height and root growth of wheat seedlings were significantly inhibi-ted,and the difference was significant(P<0.05),even the roots growth were distorted.From the heavy metal contents of wheat seedlings,with the increasing concentration of complex heavy metals,the contents of Zn in wheat seedlings increased firstly and then decreased.When the concentration of G2 increased,the contents of Zn wheat seedlings were the highest.However,the contents of Fe,Cu and Mn in wheat seedlings didn't change regularly,and the contents of Mn didn't change significantly.With the increase of the concentration of complex heavy metals,the enrichment coefficient of Zn and Fe in wheat seedlings decreased gradually.The bioenrichment coefficient and biotransport coefficient of Zn were significantly higher than that of Fe,Cu and Mn,and the ab-sorption and enrichment ability of Zn in the seedling of wheat seedlings were very strong.The migration rate of Zn in wheat seedlings treated with G3 concentration were significantly higher than that other treatments.
NETL
NSTL
万方数据
