PJB-2020-490
ALLELOPATHIC ACTIVITY AND PHENOLIC PROFILE OF SOME MEDITERRANEAN ASTERACEAE PLANTS
Asuman Karadeniz Pekg�z
Abstract
Allelopathy is a major issue in agricultural management technics such as weed control, crop protection and crop re-establishment. Allelopathic activity of some Mediterranean species, Calendula arvensis (Vaill) L., Chrysanthemum coronarium (L.) Spach, Cichorium intybus L., Scolymus hispanicus L., and Tragopogon porrifolius subsp. longirostris (Sch. Bip.) Greuter, were investigated by using early seedling growth bioassay and the phenolic content was determined. All the concentrations of gallic acid (as a positive control presumably), 4 g /L concentrations of C. arvensis, S. hispanicus and T. porrifolius extracts showed severe inhibition on garden cress (Lepidium sativum L.) seedlings. 2,2-diphenyl-1-picril-hydrazyl radical scavenging activity of C. coronarium, C. intybus and S. hispanicus extracts were higher than that of the others (p<0.05). The highest gallic acid equivalent total phenolic content was found in C. coronarium and catechin equivalent total flavonoid content was found in C. intybus and S. hispanicus extracts, respectively. High Performance Liquid Chromatography analysis indicated C. intybus extract had the highest quercetin, vanillic and ferulic acid contents. The highest caffeic, vanillic and benzoic acids were found in C. arvensis extract while the highest p-coumaric acid were found in C. coronarium and S. hispanicus extracts, respectively. C. arvensis seems to be prominently rich in phenolic substances, besides its higher phytotoxic activity.
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