Abstract
Total phenol content, antioxidant and allelopathic properties of roots, steems and leaves extracts of Tunisian endemic T. numidicus were studied. Three solvent systems with varying polarities (petroleum ether, ethyl acetate and methanol) were used. The highest amounts of polyphenols (98.66±3.17mg EAG/g DW), flavonoids (54.28±1.6mg RE/g DW), flavonols (27.23±1.71mg RE/g DW) and proanthocyanidins (5.12±0.8μg cyanidin chloride/g DW) were shown by the polar subfraction of the leaf methanolic extracts. The efficiency of the solvents used to extract phenols from the three organs varied considerably. The level of antioxidant activity estimated by DPPH and ABTS test systems was high for leaf (IC50=11.06±0.33μg/ml; 235.46±2.14μg TE/mg DW) and stems (IC50=15.29±0.9μg/ml; 233.75±1.2μg TE/mg DW) methanolic extracts. A significant correlation between radical-scavenging capacities of extracts with total phenolic compound content was observed. The results also indicate that the root extracts inhibited the shoot and root growth of Medicago sativa and Triticum æstivum seedlings. Thus, the T. numidicus extracts may be used as a natural herbicide.
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