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Chemical and Biological Technologies in Agriculture

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
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