Table 3 Amine group containing metabolites identified in the phloem of wheat as measured by LC-MS collected at two maturities ( n =4), unless otherwise stated mean and standard error of all quantitated metabolites are reported as mMol L ^-1

Ammonia (ISTD RR)

33.8

1.275

Glutathione (ISTD RR)

0.58

0.0905

Glutamine

170.8

50.895

Valine

75.5

17.52

Histidine

64.7

25.24

Serine

63.1

25.455

Glutamate

36.3

15.32

Arginine

39.8

3.74

Alanine

42.0

6.045

Proline

21.2

8.125

Phenylalanine

58.1

18.365

Threonine

49.7

15.515

Isoleucine

44.3

11.275

Leucine

43.7

16.34

Tryptophan

44.1

8.405

Lysine

48.0

10.315

Glycine

39.9

18.275

Tyrosine

27.7

9.495

Aspartic acid

18.7

7.205

Methionine

18.8

8.31

Asparagine

7.4

2.77

β-Alanine

1.7

0.595

GABA

1.1

0.45

Ornithine

1.2

0.58

Citrulline (μmol L^-1)

232.3

39.14

Nicotianamine (μmol L^-1)*

255.4

96.71

Cysteine (μmol L^-1)

70.9

13.91

4-Hydroxy-proline (μmol L^-1)

38.5

9.675