Table 1.
Number of differential metabolites found in different pairwise comparisons and compound class.
| Compared Stages | PSS vs. FF | RS vs. FF | HS vs. FF | RS vs. PSS | HS vs. PSS | HS vs. RS | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Compound class | Up | Down | Up | Down | Up | Down | Up | Down | Up | Down | Up | Down | |
| Flavonoids (119/138) | 84 | 18 | 88 | 22 | 85 | 22 | 26 | 21 | 30 | 22 | 6 | 2 | |
| Lipids (37/52) | 6 | 15 | 5 | 29 | 5 | 27 | 2 | 20 | 2 | 21 | 0 | 2 | |
| Phenolic acids (37/48) | 16 | 10 | 20 | 12 | 19 | 13 | 10 | 7 | 11 | 8 | 3 | 2 | |
| Amino acids and its derivatives (28/46) | 2 | 14 | 7 | 20 | 5 | 19 | 4 | 3 | 5 | 4 | 0 | 3 | |
| Nucleotide and its derivatives (23/26) | 3 | 8 | 3 | 12 | 4 | 15 | 1 | 3 | 0 | 6 | 0 | 2 | |
| Organic acids (10/23) | 2 | 3 | 3 | 4 | 3 | 6 | 0 | 2 | 2 | 3 | 0 | 1 | |
| Alkaloids (15/21) | 6 | 3 | 9 | 3 | 9 | 4 | 4 | 2 | 4 | 2 | 1 | 1 | |
| Tannins (7/7) | 7 | 0 | 7 | 0 | 7 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | |
| Lignans and coumarins (5/6) | 5 | 0 | 5 | 0 | 5 | 0 | 1 | 0 | 2 | 0 | 0 | 0 | |
| Quinones (2/2) | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Other metabolites (19/34) | 4 | 6 | 6 | 8 | 6 | 6 | 3 | 1 | 5 | 3 | 3 | 1 | |
| Significant differentials | 136 | 77 | 154 | 111 | 149 | 113 | 52 | 59 | 62 | 69 | 13 | 14 | |
| All Significant differentials (302) | 213 | 265 | 262 | 111 | 131 | 27 | |||||||
Note: the number in (/) behind compound class referred to the total differential metabolites in this class found in all the comparisons and the total number of compounds in the metabolomic data. The class “other metabolites included three subclasses: saccharides and alcohols, vitamins, and others. Up/Down referred to the change trend of the metabolite content in the stage compared to the early stage.