Different proportion of Se to Pb mixed liquid were used separately to treat the root tip of garlic for 6 hours, 18 hours and 24 hours ,through normal chromosome pressing technology ,it shows that with a bigger concentration of the mixed liquid and the longer time of poison ,mitotic index went down gradually;when the concentration of Pb is lower ,the opposite effect of Se is obviously. During this process, bad - distributed of chromosome, micronucleus and some other abnormal phenomena were observed and polyp...
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