Table 2 Metabolites differentially concentrated in vascular bundles and sections without vascular bundles. Metabolites that were differentially concentrated in vascular bundles and sections without vascular bundles (with P <0.05 and ratio <0.67 or >1.5) are listed. vb: found only in vascular bundles, ** metabolites which appear to be sensitive to the sample preparation procedure (see Table 1).

stigmasterol

83-48-7

0.1

gamma-aminobutyric acid**

56-12-2

0.3

ethanolamine**

141-43-5

0.3

galactose

59-23-4

0.4

fucose

634-74-2

0.4

linolenic acid

463-40-1

0.4

glucose**

50-99-7

0.4

fructose

57-48-7

0.4

phenylalanine

63-91-2

0.5

linoleic acid**

60-33-3

0.5

leucine

61-90-5

0.5

benzoic acid

65-85-0

0.6

urea**

57-13-6

0.6

isoleucine

73-32-5

0.6

valine

72-18-4

0.6

lignoceric acid

557-59-5

0.6

mannose

3458-28-4

0.7

heptadecanoic acid

506-12-7

1.6

aspartic acid

56-84-8

1.7

malic acid

97-67-6

1.7

adipic acid

124-04-9

1.8

proline

147-85-3

1.9

sucrose

57-50-1

1.9

lauric acid**

143-07-7

1.9

raffinose

512-69-6

2.1

isocitric acid

320-77-4

2.2

oleic acid

112-80-1

2.3

myristic acid

544-63-8

2.4

glycine

56-40-6

2.8

6-amino caproic acid

60-32-2

3.5

citric acid

77-92-9

3.7

trans-squalene

111-02-4

4.4

phosphate

14265-44-2

5.2

oxoglutarate

328-50-7

vb

glyceraldehyde

367-47-5

vb

glycerone

96-26-4

vb