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Table 2 The mean and standard error of the difference and Fold change for metabolites, profiled using GC-MS, that significantly increased ( 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
Citric acid 4TMS None 0.512 0.000 0.23250 0.05283 1.8
Fructose_MX1 None 0.002un 0.000 0.27792 0.05953 1.8
Fumarate 2TMS None 0.000un 0.004 0.00942 0.00289 1.6
Gluconic acid-1,5-lactone 4TMS None 0.066 0.002 0.34643 0.09990 1.7
Glucose MX1 None 0.008un 0.002 0.63124 0.17488 1.7
Glycine 3TMS None 0.026un 0.000 0.17284 0.03384 2.2
Hexadecanoate 1TMS SQRT 0.004un 0.017 0.27188 0.10404 1.9
Methionine 1TMS None 0.337 0.024 0.00554 0.00233 1.3
Octadecanoate 1TMS SQRT 0.028un 0.021 0.21070 0.08527 1.8
Phenylalanine 2TMS None 0.654 0.018 1.07470 0.42754 1.5
Putrescine 4TMS None 0.697 0.000 0.82294 0.13397 1.9
Quinic acid 5TMS SQRT 0.010un 0.007 0.32413 0.10951 2.5
Shikimic acid 4TMS SQRT 0.060 0.000 0.23331 0.05785 2.9
Succinate 2TMS None 0.000un 0.010 0.05240 0.01802 2.3
Tyrosine 3TMS None 0.180 0.000 1.09938 0.24564 1.8
UN04_15.56_185 None 0.000un 0.019 0.10668 0.04183 1.8
UN10_19.08_217 None 0.106 0.007 0.44254 0.15290 1.4
UN16_25.71_339 None 0.016un 0.015 0.00806 0.00302 1.7
UN17_27.24_375 None 0.003un 0.000 0.01570 0.00379 1.8
UN18_28.91_437 None 0.011un 0.001 0.01317 0.00358 1.6
UN20_32.34_503 InvCBRT 0.020un 0.049 -0.62079 0.29828 1.8
  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).