Yazar "Sangun, M. K." seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    Allelopathic Potential of Rapeseed Cultivars on Germination and Seedling Growth of Weeds
    (Asian Journal Of Chemistry, 2009) Uremis, I.; Arslan, M.; Sangun, M. K.; Uygur, V.; Isler, N.
    Allelopathic suppression of weeds is receiving greater attention as a possible alternative for weed management. Rapeseed (Brassica napus L., var. oleifera) contains allelochemicals that inhibits germination and growth of weed species. Allelopathic potential of 25 rapeseed cultivars on the seed germination, shoot and root growth of Amaranthus retroflexus L. (redroot pigweed). Solanum nigrum L. (black nightshade), Portulaca oleracea L. (common purslane), Physalis angulata L. (cutleaf, ground cherry) and Echinochloa colonum (L.) Link. (junglerice) were investigated with shoot and root extracts. All rapeseed cultivars examined inhibited seed germination, shoot and root growth of tested weed species. However, inhibition rates significantly varied among rapeseed cultivars. Significant reductions in seed germination, shoot and root growths were observed as the extract concentration increased. Extracts from both above and below ground parts of rapeseed had inhibitory effect on the tested weed species, but shoot extracts had slightly higher inhibition rates than that of root extracts. Root exudates had also inhibited germination of the tested weed species, but inhibitory effects are not as high as shoot and root extracts. Relative to the germination inhibition of weed seeds, the rapeseed cultivars were categorized as having highly, moderately and low allelopathic potential. Cultivar Westar was found to be highly allelopathic while cultivars Jumbuck, Tobin, Lisoune and Galant were found to be less allelopathic on the tested weed species. Rapeseed cultivars differed in isothiocyanate benzyl and isothiocyanate allyl. Cultivars containing higher level of isothiocyanate benzyl and isothiocyanate allyl had stronger allelopathic capacity. The result of this study showed that a great deal of success could be obtained by incorporation of highly allelopathic rapeseed cultivars into crop rotations to control weeds.
  • Küçük Resim
    Öğe
    Bioactive Compounds and Antimicrobial Activity of Glasswort Salicornia europaea
    (Indian Pharmaceutical Assoc, 2021) Karan, S.; Turan, C.; Sangun, M. K.; Eliuz, E. A. E.
    This study aims to determine the chemical and physical composition and antibacterial activity of glasswort. Soxhlet extraction of Salicornia europaea was performed using Hexane and analyzed by Gas chromatography-mass spectrometry. Alpha-tocopherol content was analysed by using Liquid chromatography with tandem mass spectrometry. The elemental analysis was investigated by inductively coupled plasma mass spectrometry. The crystallographic texture and composition of powder samples were determined by X-ray diffraction. The Minimum Inhibition Concentrations and inhibition zones extracts of Salicornia europaea were performed by spectrophotometric broth microdilution and disc diffusion methods, respectively, against 4 bacteria (Escherichia coli, Klebsiella pneumonia, Bacillus subtilis, Staphylococcus aureus) and 2 fungi (Candida albicans, Candida parapsilosis). Alpha-tocopherol quantity and oil content of Salicornia europaea were found to be 2.1 +/- 0.3mg/100 g and 15.15 %, respectively. The detected minerals were also found as Sodium 447, Magnesium 51.98, K 45.86, Ca 14.27 ppm. The highest minimum inhibition concentration was 0.9 mg/ml against Escherichia coli in methanol extract (p.0.05). The highest mean inhibition zones diameter was 3.8 mm for methanol extracts against Bacillus subtilis (p.0.05). As a result, the extract and oil of Salicornia europaea can be used as potential bioactive and antimicrobial agents for pharmaceutical and cosmetics applications.
  • [ N/A ]
    Öğe
    Herbicidal Activity of Essential Oils on the Germination of Some Problem Weeds
    (Asian Journal Of Chemistry, 2009) Uremis, I.; Arslan, M.; Sangun, M. K.
    The herbicidal activities of volatile compounds of plant origin (sweet basil, Ocimum basilicum L.; common sage, Salvia officinalis L.; English lavender, Lavandula angustifolia Mill.; lemon balm, Melissa officinalis L. and common thyme i.e., Thymus vulgaris) were studied against 3 weeds (common cocklebur, Xanthium strumarium L.; sterile wild oat, Avena sterilis L and short spiked canarygrass, Phalaris brachystachys L.) in laboratory experiments. Chemical composition of the essential oils were determined by capillary gas chromatography (GC) and GC/MS, The essential oil composition varied with the species. Thymol, geranial and beta-thujone were the main constituent of T vulgaris, M. officinalis and S. officinalis oils, respectively. Linalool was the main constituent of O. basilicum and L. angustifolia oils. Each essential oil was applied at the concentrations, of 2, 4, 8, 16 and 32 mu L on the filter paper at the top of the Petri dishes to determine germination and growth. bioassays. Inhibition rate of essential oils increased with the increasing concentrations. Essential oils of T vulgaris had the highest inhibitory effect on the germination of X. strumarium and A. sterilis, on the other hand essential oil of O. basilicum had the highest inhibitory effects on the germination of P brachystachys. Each essential oil suppressed seedling and root growth of the tested weeds. Essential oil of O. basilicum, S. officinalis, L angustifolia, M. officinalis and T vulgaris could be used as alternatives of herbicides to suppress germination of X. strumarium, A. sterilis and Phalaris brachystachys seeds in organic farming systems.