Abstract: In order to explore the effect of Bacillus polymyxa on the pesticide residues and ginsenoside content in different parts of ginseng, the pesticide residues and ginsenoside content in different parts of ginseng were determined by gas chromatography and high performance liquid chromatography before and after treatment with Bacillus polymyxa. The results showed that the degradation rates of Bacillus polymyxa on the five parts of pesticide residues in descending order were 87.25% of rhizome, 69.87% of fibrous roots, 69.02% of branch roots, 54.28% of xylem, and 32.69% of phloem. The degradation rate was only 7.58%-13.33% (P<0.05). The cumulative effects of Bacillus polymyxa on the content of the 9 ginsenosides in each part of ginseng in descending order were 21.34% fibrous root, 12.00% rhizome, 9.03% branch root, 8.60% phloem, 8.18% xylem (P<0.05). The results showed that the pesticide residues and ginsenoside content in different parts of ginseng had different distributions. Bacillus polymyxa had a significant effect on the degradation rate of pesticide residues in five parts and the content of 9 ginsenosides (P<0.05).

Key words: ginseng, different part, endophytes Bacillus polymyxa, pesticide residue, ginsenoside