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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

From: Metabolite fingerprints of maize and sugarcane seedlings: searching for markers after inoculation with plant growth-promoting bacteria in humic acids

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]
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
  1. The number represent the percentage of increase in respect to control level followed by the F significance test (p < 0.01** and p < 0.05)