Table 2.
Quantitative analysis of organic acids in the root exudates of watermelon and wheat plants (μg g-1 root DW) by HPLC.
| Organic acids | Watermelon | Wheat |
|---|---|---|
| Oxalic acid | 1305.1 ± 160.3a | 414.3 ± 19.0b |
| Malic acid | 8169.7 ± 692.9a | 579.8 ± 14.1b |
| Citric acid | 3354.7 ± 374.3a | 32.4 ± 1.5b |
| Succinic acid | 1997.7 ± 160.1a | 0b |
| Fumaric acid | 13.1 ± 1.4a | 2.4 ± 0.3b |
| Total content | 14840.3 ± 1389.0a | 1028.9 ± 34.9b |
“0” means not detectable. All values are presented as mean ± SE. The different letters on the mean values of the same organic acid indicate significant differences between the treatments (P < 0.05, independent sample t-test).