Table 1 List of metabolites that showed significantly higher abundances in both maize and sugarcane extracts from seedlings treated with humic acids and plant growth-promoting bacteria in comparison with respective control
Compounds | Maize | Sugarcane | Remark |
|---|---|---|---|
Maleic acid | 116* | 122* | From Krebs tricarboxylic acid cycle (TCA) |
Malic acid | 1384** | 345** | |
Malonic acid | 416** | 298** | |
Fumaric acid | 505** | 126** | |
Citric acid | 949** | 740** | |
Isocitric acid | 2131** | 140** | |
Aconitic acid | 6959** | 2567** | |
Aspartic acid | 120** | 629** | Essential amino acid |
Shikimic acid | 955** | 385** | Precursor of aromatic compounds, key metabolism in the phenyl propanoid pathway |
4-Hydroxybenzoate | 223** | 98** | It is isomeric with 2-hydroxybenzoic acid, known as salicylic acid, a precursor to aspirin |
3,4-Dihydroxycinnamic acid | 113** | 29** | Aromatic compound |
Quinic acid | 578** | 494** | A cyclic polyol |
Mucic acid | 395** | 408** | Is an aldaric acid obtained by oxidation of galactose or galactose |
Ribonic acid | 136** | 155** | Ribonic acid is a product of the enzyme ribose 1-dehydrogenase (NADP+) [EC 1.1.1.115] |
Trehalose | 25* | 133** | Sugar linked to drought-stress plant response |
Erythritol | 53* | 169* | Nutrient for several α-2 Proteobacteria |
Oxalic acid | 971** | 259** | Strong dicarboxylic acid produced by metabolism of glyoxylic acid or ascorbic acid |
Threonic acid | 216** | 211** | Sugar acid derived from threose. The l-isomer is a metabolite of ascorbic acid (vitamin C) |
Isothreonic acid | 233** | 211** | Vitamin C derivative |
Tocopherol | 38* | 49* | Vitamin E |
Linolenic acid | 29* | 495** | Unsaturated fatty acid:octadecatrienoic acids (18:3) |
Myristic acid | 42* | 175* | Saturated fatty acid with the molecular formula CH3(CH2)12COOH |
2-Monopalmitin | 42* | 357** | Unsaturated fatty acid |