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Table 2 Significantly different acids in root, stem, and left of S. salsa and P. tenuiflora

From: Metabolic differences of two constructive species in saline-alkali grassland in China

Acids S. salsa SSC (%) P. tenuiflora SSC (%)
  0.71   0.52
root stem leaf root stem leaf
phenolic compounds gallic acid 28 ± 3a 54 ± 6a 77 ± 12.26a 23 ± 7a 8.26 ± 3b 11 ± 3b
protocatechuic acid 5.2 ± 2 a 4.86 ± 2 a 8.41 ± 2 a 5.12 ± 1 a 0.95 ± 0 b 0.77 ± 0 b
catechol 0.42 ± 0 a 1.87 ± 1 a 1.42 ± 1 a 0 b 0.29 ± 0 b 0.24 ± 0 b
epigallocatechin 1.30 ± 0 a 2.34 ± 0 a 4.92 ± 1 a 1.01 ± 0 a 0.22 ± 0 b 0 b
vanillic acid 2.01 ± 1 a 4.47 ± 2 a 7.11 ± 2 a 1.73 ± 0 a 0.48 ± 0 b 0.48 ± 0 b
vinylphenol 5.88 ± 1 a 7.69 ± 1 a 7.55 ± 1 a 6.15 ± 2 a 1.9 ± 1 b 1.77 ± 1 b
guaiacol 0.96 ± 0 a 1.78 ± 0 a 2.23 ± 1 a 1.03 ± 0 a 0.24 ± 0 b 0.22 ± 0 b
organic acids citraconic acid 8.21 ± 1 a 11 ± 3a 7.97 ± 1 a 4.49 ± 2 b 1.43 ± 1 b 1 ± 0 b
malonic acid 35 ± 11 a 44 ± 17 a 76 ± 23 a 31 ± 8 a 15 ± 5 b 16 ± 2 b
succinic acid 44 ± 13 a 145 ± 18 a 52 ± 17 a 48 ± 18 a 16 ± 3 b 15 ± 4 b
tartaric acid 1.02 ± 0 a 2.43 ± 1 a 1.75 ± 1 a 0.98 ± 0 a 0 b 0.33 ± 0 b
  itaconic acid 21 ± 5 a 40 ± 9 a 28 ± 9 a 19 ± 7 a 3.38 ± 1 b 4.44 ± 2 b
  pelargonic acid 0.52 ± 0 a 0.88 ± 0 a 1.91 ± 1 a 0.91 ± 0 a 0.31 ± 0 a 0.19 ± 0 b
  glycolic acid 17 ± 6 a 41 ± 11 a 56 ± 8 a 20 ± 8 a 6.31 ± 2 b 10 ± 2 b
  3-methylglutaric acid 1.46 ± 1 a 0 a 1 ± 0.58 a 0 b 0 a 0 b
  aminooxyacetic acid 12 ± 4 a 13 ± 4 a 18 ± 7 a 8.44 ± 4 a 0.79 ± 0 b 0.63 ± 0 b
  oxalic acid 2.58 ± 1 a 3.63 ± 1 a 4.01 ± 15 a 3 ± 0a 0.81 ± 1 b 1.15 ± 0 b
  L-gulonic acid 2.5 ± 1b 3.84 ± 1 a 2.01 ± 0 b 13 ± 5 a 10 ± 3 a 10 ± 2 a
  cumic acid 4.15 ± 1 a 6.76 ± 2 a 9.27 ± 3 a 5.43 ± 2 a 1.43 ± 1 b 0.63 ± 0 b
  palmitic acid 295 ± 86a 401 ± 42a 577 ± 140a 508 ± 215a 100 ± 31b 77 ± 18b
volatile compounds methylfumarate 0.94 ± 0 a 1.83 ± 0 a 1.46 ± 0 a 0.71 ± 0 a 0.16 ± 0 b 0.16 ± 0 b
hydroxybutyrate 0 b 0 b 0.32 ± 0 a 0.35 ± 0 a 0.16 ± 0 a 0.31 ± 0 a
gluconic lactone 2.89 ± 1 a 2.46 ± 1 a 0.98 ± 0 a 0 b 0 b 0 b
methyl hexadecanoate 0.33 ± 0 a 0.52 ± 0 a 0.92 ± 0 a 0 b 0 b 0.11 ± 0 b
dioctyl phthalate 9.13 ± 3 a 13 ± 3 a 20 ± 6 a 8.92 ± 2 a 1.39 ± 1 b 1.24 ± 0 b
methyl heptadecanoate 3.76 ± 1 a 8.3 ± 1 a 4.16 ± 1 a 1.87 ± 1 b 0.69 ± 0 b 0.44 ± 0 b
  nonanoic acid methyl ester 79 ± 18 a 105 ± 23a 149 ± 29a 114 ± 33 a 23 ± 7b 19 ± 5 b
  methyl octanoate 44 ± 6 a 59 ± 13 a 92 ± 17 a 62 ± 19 a 14 ± 3b 10 ± 3 b
  L-gulonolactone 0 a 0 b 0 b 0 a 1.61 ± 0 a 8.46 ± 4 a
  phenylacetic acid 0 b 0.64 ± 0 a 0.64 ± 0 a 0.33 ± 0 a 0 b 0 b
  hydroxymandelic acid 11 ± 2 a 8.9 ± 1 a 14 ± 4 a 12 ± 5 a 3.24 ± 1 a 2.1 ± 1 b
  5-hydroxyindole-2-carboxylic acid 0.73 ± 0 a 1.57 ± 1 a 1.89 ± 1 a 0 a 0.22 ± 0 b 0.36 ± 0 b
  5-hydroxyindole-3-acetic acid 1.41 ± 1 a 3.17 ± 1 a 2.39 ± 0 a 1.37 ± 0 a 0.27 ± 0 b 0 b
  1. SSC: Soluble salt content. The relative contents of acids are summarized from 6 biological replicates and presented as the mean ± standard error of 6 biological replicates. Different letters indicate significant differences of the same tissues between S. salsa and P. tenuiflora (p < 0.05)