| 12 | Orthosiphon stamineus | Lamiaceae | 13-epi-orthosiphol N | The IC50 value of this compound for seedling growth of garden cress and lettuce ranged from 41 to 102 µmol L−1 | Kato-Noguchi et al. [117] |
| 13 | Asparagus officinalis | Asparagaceae | p-Coumaric acid, iso-Agatharesinol and trans-Cinnamic acid | p-Coumaric acid and iso-Agatharesinol inhibited the shoot and root growth of asparagus, garden cress and ryegrass, at concentrations higher than 0.1 mM. The IC50 value for the root and shoot growth of these test plants ranged from 0.36 to 0.85 mM and 0.41 to 1.22 mM for p-Coumaric acid and iso-Agatharesinol, respectively.
trans-Cinnamic acid inhibited the growth of asparagus seedlings at concentrations greater than 10 μM. The IC50 value of the compound for growth inhibition of asparagus was 24.1 - 41.6 μM. | Kato-Noguchi et al. [118] , Kato-Noguchi et al. [119] |
| 14 | Piper methysticum | Piperaceae | 5-hydroxy-4’,7-dimethoxyflavanone (1); 5,7-dihydroxy-4’-methoxy-6,8-dimethylflavanone (matteucinol, 2); a mixture of kavain and yagonin (3), and dihydro-5,6-dehydrokavain, 7,8-dihydrokavain, dihydromethysticin and methysticin (4). | The compound 1 and 2 exhibited the strongest inhibition on shoot elongation (IC50 value = 120.2 and 248.0 µg mL−1, respectively), whilst compound 3 and 4 showed the highest root growth inhibition of radish (IC50 value = 7.7 and 15.7 µg mL−1, respectively). | Van et al. [120] |
| 15 | Helianthus annuus | Asteraceae | 4, 15-dinor-3-hydroxy-1(5)-xanthene-12,8-olide (sundiversifolide) | Inhibited the seedling growth of cat's-eyes by about 50% at a concentration of 30 ppm. | Ohno et al. [121] |
| 16 | Ipomoea cairica | Convolvulaceae | 3-3’ -5-Trihydroxy- 4’-7-dimethoxyflavone and 3-3’-5-Trihydroxy-4’-7-dimethoxyflavone-3-O-sulfate | both these allelochemicals independently or jointly inhibited the seed germinations radish, Cucumber, Napa cabbage and Ligularia virgaurea (a weed) | Ma et al. [122] |
| 17 | Chrysanthemum morifolium | Asteraceae | Luteolin 7-O-β-glucuronide | At concentrations of 0.2 and 2.0 mM, the compound reduced the frond number and chlorophyll content of Lemna gibba | Beninger and Hall [123] |
| 18 | Cymbopogon nardus | Poaceae | Myrislignan, N-Octanoyl tyramine | IC50 value of Myrislignan for the shoot and root growth of garden cress was 429 and 517 μM, respectively. IC50 values of N-octanoyl tyramine were 426 and 444 μM for shoot and root growth of cress, and that for barnyard grass was 1430 and 450 μM, respectively. | Suwitchayanon et al. [124] , Suwitchayanon et al. [125] |
| 19 | Rumex maritimus | Polygonaceae | 2-Methoxystypandrone, 5,7-dihydroxyphthalide and altechromone A. | IC50 values of 2-Methoxystypandrone for growth inhibition of Garden cress was ranged from 5.8 to 11.8 μM.
IC50 values for the growth inhibition of garden cress seedling growth were 1.73 - 2.48 mM for 5, 7-dihydroxyphthalide and 0.66 - 1.41 mM for altechromone A, respectively. | Islam et al. [126] , Islam et al. [127] |
| 20 | Caesalpinia mimosoides | Fabaceae | Methyl gallate | IC50 values of methyl gallate for the growth of garden cress and barnyard grass ranged from 2.3 to 2.9 and 0.3 to 30.5 mM, respectively. |
Boonmee et al. [128] |