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Kova\'e8i\'e6a 1, 10000 Zagreb, }{\i\fs22\insrsid14704909 Croatia}{\i\fs22\insrsid12279578\charrsid2032773 \par }{\i\fs22\super\insrsid12279578\charrsid2032773 4}{\i\fs22\insrsid14704909\charrsid14704909 }{\i\fs22\insrsid14704909\charrsid7169048 Fac}{\i\fs22\insrsid14704909 ulty of }{\i\fs22\insrsid14704909\charrsid7169048 Pharm}{\i\fs22\insrsid14704909 acy and }{ \i\fs22\insrsid14704909\charrsid7169048 Biochem}{\i\fs22\insrsid14704909 istry, University of Zagreb}{\i\fs22\insrsid12279578\charrsid2032773 , }{\i\fs22\insrsid14704909 Pharmaceutical botanical garden }{\i\fs22\insrsid12279578\charrsid2032773 "Fran Ku \'9aan" Schrottova 39, 10000 Zagreb, }{\i\fs22\insrsid14704909 Croatia}{\i\fs22\insrsid12279578\charrsid2032773 \par }\pard \qj \fi708\li0\ri0\widctlpar\faauto\rin0\lin0\itap0\pararsid9123510 {\lang1033\langfe1050\langnp1033\insrsid12279578 \par }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 Ten accessions of }{\lang1033\langfe1050\langnp1033\insrsid9123510 o}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 regano (}{ \i\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 Origanum vulgare}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 L.) from the Collection of }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 Medicinal and Aromatic P}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 lants of the Croatian Bank of Plant Genes }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 were}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 included in }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 the }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 field trial in order t}{ \lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 o }{\lang1033\langfe1050\langnp1033\insrsid9123510 characterize and }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 evaluate mo}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 rphological and }{\lang1033\langfe1050\langnp1033\insrsid9123510 bio}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 chemical traits.}{ \lang1033\langfe1050\langnp1033\insrsid9123510 }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 The field trial was set in random block design in three repetitions. }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 T}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 otal of 300 plants randomly chosen from each accession were analyzed for important qualitative and quantitative traits}{\lang1033\langfe1050\langnp1033\insrsid4801828 }{ \lang1033\langfe1050\langnp1033\insrsid9123510 following }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 descriptor list. Accessions of }{\lang1033\langfe1050\langnp1033\insrsid9123510 o}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 regano differed significantly in all }{\lang1033\langfe1050\langnp1033\insrsid3279176 quantitative }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 traits except }{ \lang1033\langfe1050\langnp1033\insrsid9123510 in }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 flower }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 width}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 . The highest variation was found in the number of stems per plant, while the lowest was for the leaflet }{\lang1033\langfe1050\langnp1033\insrsid4801828\charrsid4801828 width}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 .}{\lang1033\langfe1050\langnp1033\insrsid3279176 Within qualitative traits the highest total diversity (}{\lang1033\langfe1050\langnp1033\insrsid3279176\charrsid14352676 H}{ \lang1033\langfe1050\sub\langnp1033\insrsid3279176\charrsid14352676 T}{\lang1033\langfe1050\langnp1033\insrsid3279176\charrsid14352676 )}{\lang1033\langfe1050\langnp1033\insrsid3279176 was }{\lang1033\langfe1050\langnp1033\insrsid8871315 found in the colo}{\lang1033\langfe1050\langnp1033\insrsid9123510 u}{\lang1033\langfe1050\langnp1033\insrsid8871315 r of bracts (0.74) while the lowest was for the }{\lang1033\langfe1050\langnp1033\insrsid8871315\charrsid14352676 leaf }{ \lang1033\langfe1050\langnp1033\insrsid14352676 folding}{\lang1033\langfe1050\langnp1033\insrsid8871315 (0.08).}{\lang1033\langfe1050\langnp1033\insrsid9123510 }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 Comparative phytochemical investigation of biologically active compounds was carried out. The presence of essential oil, tannins, flavonoids, phenolic acids, saponin substances, triterpenes and sterols in plant samples was }{ \lang1033\langfe1050\langnp1033\insrsid9123510 checked}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 using histochemical reactions and thin layer chromatography. The c}{\lang1033\langfe1050\langnp1033\insrsid9123510 ontent s of total polyphenols (4.}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 05-16}{\lang1033\langfe1050\langnp1033\insrsid9123510 .}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 09 %), tannins (0}{ \lang1033\langfe1050\langnp1033\insrsid9123510 .}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 89-7}{\lang1033\langfe1050\langnp1033\insrsid9123510 .}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 33 %) and flavonoids (0 }{\lang1033\langfe1050\langnp1033\insrsid9123510 .}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 03-0}{\lang1033\langfe1050\langnp1033\insrsid9123510 .}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 36) were determined spectrophotometrically. Significant differences in the content and composition of biologically active compounds }{\lang1033\langfe1050\langnp1033\insrsid9123510 among}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 the }{\lang1033\langfe1050\langnp1033\insrsid9123510 analysed}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 accessions were observed. Flavonoids were }{\lang1033\langfe1050\langnp1033\insrsid10100700 identified}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 as potential chemotaxonomical markers }{\lang1033\langfe1050\langnp1033\insrsid10100700 for diversity }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 stud}{ \lang1033\langfe1050\langnp1033\insrsid10100700 ies concerning}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 }{\i\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 Origanum}{ \lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 species. \par }\pard \qj \li0\ri0\widctlpar\aspalpha\aspnum\faauto\adjustright\rin0\lin0\itap0\pararsid15284962 {\lang1033\langfe1050\langnp1033\insrsid9123510 \tab }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 Key words: }{ \lang1033\langfe1050\langnp1033\insrsid10100700 chemotaxonomical markers, }{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 flavonoids, morphological traits, }{\i\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 Origanum vulgare}{\lang1033\langfe1050\langnp1033\insrsid8418140\charrsid4801828 L.}{\lang1033\langfe1050\langnp1033\insrsid10100700 , plant genetic resources}{\lang1033\langfe1050\langnp1033\insrsid9123510 \par }{\lang1033\langfe1050\langnp1033\insrsid9123510\charrsid4801828 \par }}