Table 2. Metabolites identified as important variables in the projection for species discrimination.
| No. | RT(min) | Name | VIP | p-value | FDR-value |
|---|---|---|---|---|---|
| 1 | 29.94 | Sucrose | 1.192 | 1.07E-15 | 6.30E-15 |
| 2 | 24.49 | Glucose | 1.191 | 3.27E-27 | 3.27E-25 |
| 3 | 24.31 | Galactose | 1.178 | 1.59E-15 | 1.47E-18 |
| 4 | 18.95 | Succinate | 1.163 | 1.08E-16 | 7.35E-16 |
| 5 | 24.08 | Fructose | 1.161 | 2.98E-22 | 8.70E-21 |
| 6 | 22.61 | 1-Cyclohexene-1-carboxylic acid | 1.148 | 0.06 | 0.06 |
| 7 | 25.04 | Hexadecanoate | 1.145 | 7.98E-08 | 1.09E-07 |
| 8 | 12.73 | Propanoate | 1.145 | 0.06 | 0.06 |
| 9 | 28.99 | Oleanitrile | 1.140 | 2.35E-28 | 8.24E-26 |
| 10 | 25.37 | Myo-inositol | 1.118 | 8.2E-10 | 1.24E- 09 |
| 11 | 16.05 | Glycerol | 1.099 | 1.79E-15 | 9.43E-15 |
RT, retention time; VIP, variable importance in the projection; p-value and FDR-value indicate the significance and false discovery rate of difference of the relative metabolite levels between D. officinale and D. huoshanense, respectively.