Table 1 Metabolites displaying differential abundance between root exudates collected from Fe-sufficient and Fe-deficient microcuttings of Ramsey and 140R rootstocks at 3 and 6 h.

From: Changes in physiological activities and root exudation profile of two grapevine rootstocks reveal common and specific strategies for Fe acquisition

Compound

% variation

p-value

VIP

Ramsey Fe+ vs. Ramsey Fe−; 3 h

Increased abundance

l-glutamate

16,160.03

0.004

2.19

Cyclolariciresinol

8.19

0.0393

1.74

Caprylic acid

61.19

0.0498

1.71

Decreased abundance

Campesteryl ferulate

19.36

0.0169

2

140R Fe+ vs. 140R Fe−; 3 h

Increased abundance

3-Sinapoylquinic acid

6.25

0.0016

1.85

p-Coumaric acid-4-O-glucoside

5.07

0.0022

1.80

Apigenin 6-C-glucoside

5.57

0.0042

1.75

2-Methoxy-5-prop-1-enylphenol

18.17

0.0086

1.66

Cyclolariciresinol

9.94

0.0074

1.65

Avenanthramide 2f.

5.79

0.0114

1.64

1-Acetoxypinoresinol

5.56

0.0111

1.62

Isoxanthohumol

5.31

0.0194

1.53

5-Heneicosenylresorcinol

9.74

0.0256

1.49

Caffeic acid ethyl ester

10.29

0.026

1.48

Benzoxazinone

7.63

0.0273

1.47

l-histidine

11.16

0.0458

1.40

l-ascorbate

54.86

0.04

1.38

Gallic acid ethyl ester

6.14

0.0492

1.33

Decreased abundance

Campesteryl ferulate

45.32

0.0408

1.42

Schottenol ferulate

13.52

0.0381

1.41

Ramsey Fe+ vs. Ramsey Fe−; 6 h

Increased abundance

l-glutamate

63,740.98

 < 0.0001

2.50

Maltose/sucrose

216.50

0.0043

2.00

l-tyrosine

242.13

0.0074

1.98

Homoveratric acid

52.02

0.0209

1.76

Decreased abundance

Sakuranetin

60.09

0.0352

1.71

4-Hydroxycoumarin

6.93

0.0462

1.66

140R Fe+ vs. 140R Fe−; 6 h

Increased abundance

l-glutamate

25,186.35

 < 0.0001

2.17

Caffeic acid 4-O-glucoside

82.92

0.0049

1.79

Maltose/sucrose

98.31

0.0047

1.77

Wighteone

15.30

0.0073

1.74

Episesamin

15.30

0.0073

1.74

3,4 Dihydroxyphenyl-2-oxypropanoic acid

35.43

0.0101

1.69

2-Methoxy-5-prop-1-enylphenol

8.36

0.0165

1.60

2-Hydroxybenzoic acid

5.37

0.0253

1.52

l-methionine

67.82

0.0429

1.46

Decreased abundance

Campesteryl ferulate

11.19

0.0302

1.55

  1. The percentage increase or decrease, p-value for t-test and VIP value from OPLS-DA are reported for each compound.
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