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Table 2 Response ratios of amino acids and compounds related to nitrogen metabolism (HA-treated vs control)

From: Humic acids increase the maize seedlings exudation yield

Compound Root extract Exudates
Amino acids
 Methionine − 2.41 13.4*
 Oxoproline − 1.65* 5.1*
 Lysine − 1.72* 4.6*
 Tyrosine − 1.95 3.7*
 Glutaric acid − 1.62* 3.7*
 Tryptophan − 2.22* 2.5*
 Valine − 2.41* 2.5*
 Homoserine − 1.65 13.7*
 Citrulline − 2.11 23.2*
 Aspartic acid − 1.76 7.9*
 Histidine − 1.76 7.0*
 Alanine–alanine − 2.16 3.8*
 Threonine − 1.57 3.3*
 5-Hydroxynorvaline − 2.22 2.5*
 Phenylalanine − 2.15 2.2*
 Methionine sulfoxide 1.39 2.0*
 Proline − 1.57* − 2.5
 Ornithine − 1.98* 1.0
 Glycine − 2.41 1.6
 Isoleucine − 3.30 2.2
 Asparagine − 2.48 2.0
 Glutamine − 2.12 2.0
 Glutamic acid − 1.14 1.2
 Leucine − 2.55 1.9
 Alanine − 1.95 1.3
 Beta-alanine − 2.93 1.1
 Serine − 1.76 2.0
 O-Acetylserine − 2.53 − 3.0
Nucleotides related compounds
 Adenine − 2.72* 6.74*
 Adenosine 2.66 1.14
 Guanosine − 2.35* 1.51*
 5′-Deoxy-5′-methylthioadenosine − 1.47 − 3.22*
 2′-Deoxyguanosine − 3.00* 1.23
 Thymidine − 1.72 2.6*
 Thymine − 1.43 − 1.3
 4-Aminobutyric acid − 1.43 1.1
 3-Aminoisobutyric acid − 1.72* − 1.1
 Uridine 1.12 5.59*
 Urea − 3.44* 1.23
 Uracil − 1.11 2.76*
 Pseudo uridine − 2.44 2.60*
 Allantoic acid − 1.23 8.34*
 Uric acid − 3.57 2.21*
Compounds linked to stress response
 Putrescine − 1.68* 2.60
 N-Acetylputrescine − 1.73 16.70*
Compounds linked to carbohydrates metabolism
 Aminomalonate − 2.57* 18.76*
 N-Acetyl-d-hexosamine − 2.01 4.41*
 N-Acetyl-d-galactosamine − 1.08 3.20*
 Cyclohexylamine − 1.59* − 1.78*
 N-Acetyl-d-mannosamine − 1.84 1.46
 Hydroxylamine − 1.03 − 1.20
 Ethanolamine − 1.01 1.58
 1,3-Diaminopropane 1.05 1.90
Vitamins
 Nicotinic acid − 1.63 2.79*
  1. When the response ratio (level in a given treatment divided by the level in the control) was lower than 1 the inverse was taken, and the sign changed. Values in italic type and indicated by * represent a Dunnett’s test significance of p < 0.05 against the control