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    High yielding indigo sources in native Isatis (Brassicaceae) taxa from Turkey
    (Springer, 2016) Karaman, Sengul; Diraz, Emel; Comlekcioglu, Nazan; Ilcim, Ahmet; Durdu, Hasan; Tansi, Sezen
    Indigo dye has a distinctive blue color and is one of the oldest known dyestuffs. In order to identify new Isatis genotypes for indigo production, 14 Isatis taxa collected from native area were grown under field conditions in Kahramanmaras,, Turkey. The effects of taxa and harvest times on leaf, indigo and indican yield were analyzed and compared with culture species (Isatis tinctoria and Isatis indigotica) by using spectrophotometer and HPLC. High indigo yield (87.13 kg/ha) was obtained from Isatis constricta and I. tinctoria subsp. tomentolla (Mersin location) had high indican yield (12.25 mg/g) in fresh leaves. The present work identified high indigo yielding taxa that may be used for genetic improvement in order to re-introduce Isatis species in the agricultural systems of Mediterranean regions. Especially I. constricta can be evaluated in terms of higher indigo yield than the native and culture taxa. I. constricta is an endemic plant in endangered category. This situation reveals that the need for the conservation of the species. To the best of our knowledge, there is no previous study reported about indigo contents of the studied 11 Isatis spp. so far.
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    Öğe
    TRYPTOPHAN DERIVATIVES, PHENOLIC COMPOUNDS AND ANTIOXIDANT POTENTIAL OF SOME WILD TANACETUM TAXA FROM TURKEY
    (Univ Babes-Bolyai, 2021) Diraz-Yildirim, Emel; Karaman, Sengul; Kulak, Muhittin; Ilcim, Ahmet
    The important molecule tryptophan and its derivatives serotonin and melatonin have vital functions in human and plant biosystem. Recent reports claimed these molecules and parthenolide may also have a role in COVID-19 treatments. Herewith the study, contents of chlorogenic acid, cynarin, quinic acid, parthenolide, and tryptophan derivatives in leaf and flowers of seven species of Tanacetum from Turkey were examined using HPLC. The methanolic extracts of the species were also screened for their total phenolic content and DPPH scavenging activity. Regarding to HPLC data, the highest amount of chlorogenic acid and cynarin were detected in T. cilicicum, quinic acid in T. densum subsp. amani and parthenolide in T. argenteum subsp. argenteum leaves. Also, the highest amount of tryptophan and serotonin were estimated in T. argenteum subsp. argenteum. Melatonin content was highest in T. densum subsp. amani. All Tanacetum species exhibited potent antioxidant activities. T. densum subsp. amani (Afsin) flowers had higher DPPH activity than control group BHT and T. cilicicum leaves and flowers had the highest total phenolic content. Herewith, phenolic profiles of T. argenteum subsp. argenteum, T. armenum and T. densum subsp. amani and tryptophan derivates of the species were reported for the first time.