20.500.12556/RUL-135572 Seasonal variations of naphthoquinone contents (juglone and hydrojuglone glycosides) in Juglans regia L. The aim of the present study was to determine the content of naphthoquinones (juglone and hydrojuglone glycosides) in different tissues of walnut plants (Juglans regia L.) through the growing season, for the French cultivar ’Franquette’ and the Slovenian cultivar ’Rubina’. Husk, leaves, bark, catkin and pistillates were studied. Naphthoquinones contents in the catkins (male flowers) and pistillates (female flowers) of J. regia, have to the best of our knowledge not been defined in any metabolic studies to date. The naphthoquinones were identified and quantified by HPLC/MS. The content of all individual and total naphthoquinones and the total phenolics content in the catkins were consistent with those in the bark, which suggests that the phenolic compounds are redistributed from the catkins to the bark after flowering to prevent the loss of these valuable plant compounds. The lowest content of naphthoquinones was in the husks and bark for both cultivars, while the highest content was observed in the leaves. The highest content of hydrojuglone glucoside was observed in the pistillate followed by catkin and bark, while the highest content of hydrojuglone rhamnoside and hydrojuglone pentoside was observed in leaves. The highest content of juglone was observed in the husk followed by the catkin. Quantification of the naphthoquinones in the different tissues of J. regia during different growth periods provides valuable data on when the extraction of individual naphthoquinones might be useful for further isolation or for pharmaceutical studies. walnut flower hydrojuglone juglone naphthoquinone phenolic compounds seasonal variation oreh orehov cvet juglon fenolne spojine hidrojuglon 1 4-naftokinon sezonske spremembe true false true Angleški jezik Slovenski jezik Članek v reviji 2022-03-21 08:13:05 2022-03-21 08:13:11 2022-09-14 04:14:02 0000-00-00 00:00:00 2022 0 0 10 str. art. 111065 Vol. 300 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 634.1/.7 0304-4238 10.1016/j.scienta.2022.111065 101611779 RAZ_Medic_Aljaz_2022.pdf RAZ_Medic_Aljaz_2022.pdf 1 0B38DB4783A0A5BF5FB27B81DB98AB5B 431a1aac30d86a4d0dd54b889e6ef962c6fbc1171142551f5a98a52636d16bbf e8999913-a8e6-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154717 https://www.sciencedirect.com/science/article/pii/S030442382200190X 0 5e7ef6b3-a8e6-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154716 Biotehniška fakulteta 0 0 0