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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