Table 1.
Candidate metabolites (VIP > 0.5) of muscadine grape genotypes at selected developmental stages.
| No. | Compounds | VIP | Chemical Class | FS | V | RIP-SF | RIP-S |
|---|---|---|---|---|---|---|---|
| 1 | Malic acid | 11.16 | Dicarboxylic acid | YES | YES | YES | YES |
| 2 | Malonic acid | 7.35 | Dicarboxylic acid | YES | YES | YES | YES |
| 3 | Tartaric acid | 7.34 | Carboxylic acid | YES | YES | YES | YES |
| 4 | Oxalic acid | 7.33 | Dicarboxylic acid | YES | YES | YES | YES |
| 5 | Trehalose | 3.04 | Disaccharide | YES | YES | YES | YES |
| 6 | Catechin | 2.27 | Flavonoid | YES | YES | YES | YES |
| 7 | Gallic acid | 2.06 | Phenolic acid | YES | YES | YES | YES |
| 8 | L-arginine | 1.97 | Essential amino acid | YES | YES | YES | YES |
| 9 | Citric acid | 1.65 | Tricarboxylic acid | YES | YES | YES | YES |
| 10 | Oxalacetic acid | 1.63 | Oxodicarboxylic acid | YES | YES | YES | YES |
| 11 | Quinic acid | 1.53 | Cyclohexanecarboxylic acid | YES | YES | YES | YES |
| 12 | 4-Acetamidobutanoic acid | 1.04 | Gamma amino acids | YES | YES | YES | YES |
| 13 | Glutamine | 0.98 | Amino acid | YES | YES | YES | YES |
| 14 | Dihydrouracil | 0.95 | Pyrimidones | YES | YES | YES | YES |
| 15 | 2-Furanmethanol | 0.86 | Heteroaromatic compound | YES | YES | YES | YES |
| 16 | Pyroglutamic acid | 0.82 | Alpha amino acids | YES | YES | YES | YES |
| 17 | Serine | 0.81 | Amino acid | YES | YES | YES | YES |
| 18 | Ornithine | 0.79 | Amino acid | YES | YES | YES | YES |
| 19 | Proline | 0.79 | Amino acid | YES | YES | YES | YES |
| 20 | Glycerophosphocholine | 0.75 | Glycerophosphocholine | YES | YES | YES | YES |
| 21 | Epicatechin-3-gallate | 0.71 | Flavan-3-ol | YES | YES | YES | YES |
| 22 | L-leucine | 0.67 | Essential amino acid | YES | YES | YES | YES |
| 23 | Fumaric acid | 0.61 | Organic compound | YES | YES | YES | YES |
| 24 | 7-Methylxanthine | 0.55 | Purines | YES | YES | YES | YES |
| 25 | Ellagic acid | 0.53 | Hydrolyzable tannin | YES | YES | YES | YES |
| 26 | Hydroxypropionic acid | 0.52 | Alpha hydroxy acid | YES | YES | YES | YES |
| 27 | Tiglic acid | 0.51 | Monocarboxylic unsaturated organic acid | YES | YES | YES | YES |
FS: fruit-set stage; V: veraison stage; RIP-SF: ripening skin/flesh stage; RIP-S: ripening seeds stage.