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Table 1 The mean and standard error of the difference and Fold change for metabolites, profiled using GC-MS, that significantly decreased ( p <0.05) in the phloem from 9–11 DAA (n = 15) to 18–20 DAA (n = 16)

From: Metabolite profiling of wheat (Triticum aestivum L.) phloem exudate

Metabolite Transformation Levene’s test for equality of variances sig. t-test for equality of means sig. (2-tailed) Mean difference Std. error difference Fold change
3-amino-piperidin-2-one 2TMS SQRT 0.227 0.000 -0.34838 0.07402 -3.4
Alanine 2TMS SQRT 0.000un 0.009 -0.23127 0.08092 -1.9
Arginine 3TMS Ln 0.286 0.000 -0.84617 0.20727 -2.3
Glutamate 3TMS None 0.003un 0.005 -1.11392 0.35445 -2.3
Glutamine 3TMS CBRT 0.296 0.001 -0.34581 0.09220 -2.6
Histidine 3TMS Ln 0.994 0.032 -0.62065 0.27622 -1.9
Homoserine 3TMS None 0.613 0.000 -0.08141 0.01851 -1.9
Lysine 4TMS None 0.180 0.006 -0.57860 0.19365 -1.4
Ornithine 3TMS None 0.001un 0.007 -0.17965 0.05689 -4.6
Pyroglutamate 2TMS None 0.444 0.018 -3.21496 1.28551 -1.3
Serine 3TMS None 0.073 0.000 -4.85198 1.16680 -1.6
Trehalose 8TMS Ln 0.952 0.000 -1.25509 0.19795 -3.5
UN01_10.61_158 CBRT 0.360 0.000 -0.07041 0.01492 -2.3
UN07_17.62_275 Ln 0.177 0.002 -0.68564 0.20462 -2.0
UN08_17.96_360 CBRT 0.673 0.001 -0.19065 0.05177 -3.4
UN09_18.15_275 CBRT 0.363 0.003 -0.08408 0.02541 -2.0
UN11_19.48_299 CBRT 0.003un 0.003 -0.08195 0.02451 -2.0
UN26_14.48_229 Ln 0.034un 0.001 -0.61709 0.15206 -1.9
  1. Also shown are the p values for Levene’s test of equality of variance, where values are less than 0.05 (equal variances not assumed = un), equal sample variances were not assumed when calculating t-test. (x TMS = Trimethylsilyl derivative where x = the number of TMS groups; y MX = methoxyamine derivatised product where y = 1 or 2).