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The approach of this study on isoenzyme variation which emploies the principle of electrophoresis is a new and pricise means for the study of genetic variation at present. The experimental procedures were essentially similar to those described by Miyazaki et al.(1969) and Chu et al. (1972). They contained (1)preparation for reagents and samples (2)extraction of soluble protein (3)electrophoretic separation, and (4)staining. Three replications were made for each of the sample. Samples of needle-leaves of Taiwania crypto-merioides Hay. Were collected from various locations of Taiwan, then analyzed for the isoenzyme variation patterns of peroxidase. The results showed that: (1)needle-leaves collected from various parts within the same tree exhibited the same pattern of peroxidase isoenzymes; (2)peroxidase isoenzymes exhibited different patterns in various ages, but all combined with five bands; (3)the activity of peroxidase isoenzymes varied in different seasens and showed the lowest level in rich year. (4)the patterns of peroxidase isoenzymes of both grafted saplings and their mother trees were identical. According to the results of the analysis of the peroxidase isoenzymes of Taiwania cryptomerioides Hay., no significantly genetic variations were found among different sources of Taiwania cryptrmerioides Hay.
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