- TOXICITY OF HEAVY METALS TO HORDEUM VULGARE
- Abstract：The toxic effects of six heavy metals (Hg2+ , Cd2+ , Pb2+ , Ni2+ , Cu2+ , Zn2+ ) at different concentrations on H ordeum vulgare seedlings were studied. The results indicated that the percentage of seed germination rate of root growth and mitotic index decreased progressively with the increasing of concentrations of heavy metals and treatment durations. After 24 h treatment with 1×10-2 mol/L Hg2+ , Cd2+ , and Pb2+ , cell division was completely inhibited by Hg2+ , Cd2+ , Pb2+ . The total frequency of chromosomal aberrations induced by Hg2+ , Cd2+ , Pb2+ was higher than that of Ni2+ , Cu2+ and Zn2+ . After the treatment with Hg2+ , Cd+2 , Pb2+ at concentrations of 5×10-3 —5×10-4 mol/L for 24 h and Ni2+ at same concentration for 48 h, the nucleolus was disintegrated and forming a large amount of nucleolar particles which go into the cytoplasm from the cell nucleus. But after the treatment with Cu2+ and Zn2+ , the nucleous was not affected. The order of six heavy metals on cytogenetical toxical effects is Hg2+ >Cd2+ >Pb2+ >Ni2+ >Cu2+ >Zn2+ . The possible mechanism of poisoning of heavy metals on plant cells was also discussed.
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