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Table 4 Response ratios of aromatic and other compounds (HA-treated vs control)

From: Humic acids increase the maize seedlings exudation yield

  Root extract Exudates
Aromatic compounds
 Shikimic acid 1.04 9.05*
 Cinnamic acid − 1.34 35.68*
 Benzoic acid − 1.39* 3.23*
 4-Hydroxycinnamic acid − 1.16 114.18*
 4-Hydroxybenzoate − 1.21 4.96*
 Arbutin (glycosylated hydroquinone) − 1.17 3.75*
 Vanillic acid − 2.05* 4.83*
 Sinapinic acid − 1.88* − 1.92
 Ferulic acid − 1.48 18.95*
Aromatic compounds linked to stress response
 Tyrosol − 1.11 3.02*
 Quinic acid 1.22 5.70*
 Salicylic acid − 1.10 3.11*
Others compounds
 Phosphate − 1.77 25.31
 Myo-inositol − 2.40* 4.03
 Methanolphosphate − 1.20 46.52*
  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