This study was to examine the variations of chromosome number and the ranges of variety in the suspension culture of ginseng (Panax ginseng C. A. Meyer) callus cell, and the effect of plant hormones for the chromosome aberration. Plant hormones added with MS medium in the suspension culture were 2,4-D, kinetin, and 2,4-D+kinetin and concentration of the plant hormones were 1000 μM, 10 μM and 0.1 μM respectively. As a result of these experiment the following conclusion has been obtained. Media contained with 2,4-D+kinetin in 10 μM concentration was very effective in the suspension culture result from 26.4% mitosis frequency, and found the various variation of chromosome number. Variety of chromosome number was diversed (9～110), espicially frequency of hypohaploid and hyperhaploid cells were very higher than hyperdiploid cells. In this experiments, it is suggested that 10 μM 2,4-D+kinetin added with medium in the suspension culture of ginseng callus was effect in the variations of chromosome number.

This experiment was carried out to investigate the effects of mercury and arsenic on the growth of Arabidopsis thaliana when treated with three different concentrations. When treated with mercury, there was no noticeable difference in the growth of the plant between the group treated with 0.5 ㎍/L (the effluent standard established by the Ministry of Environment) and the group treated with the concentration 100 times higher. They both showed almost the same level of growth as that of the normal plant. But the group of the concentration 10 times higher showed significantly 10% more growth compared with the normal plant. When treated with arsenic, the three different groups all showed a little more growth compared with the normal plant. Interestingly, the group of the concentration 10 times higher than the official standard concentration of arsenic (50 ㎍/L) showed the highest level of growth, significantly 20% more than the normal plant. These results show that some amount of mercury and arsenic in the soil do not have much effect on the growth of Arabidopsis thaliana, and that optimum concentrations of mercury and arsenic can even stimulate the growth of the plant.