Objective: To research into the cause of distinction in antiendotoxic activation of Radix Isatidis from different cultivated populations.
Method: 19 samples of Radix Isatidis were gathered. 12 portions of seeds were cultivated in the same field in Shanghai, and the selected and artificially bred autotetraploid seeds were planted in 5 different locations. All the samples were compared through antiendotoxic experiment.
Results: There are some marked distinction among the 19 samples from different populations. The distinction of the 12 samples cultivated in the same field didn't disappear. The activation of autotetraploid from 5 different locations didn't vary on the whole.
Conclusion: Germplasm is the main factor to cause activation distinctions of Radix Isatidis, while environment is less important.