## 3 Results and Discussion

Tablecontent of flavonoids, exceeding 1000 mg-100 g\({}^{-1}\) fw: clone 1-17-59, cvs Bakczarskij Velikan, Amphora, Valhova and Czarna, and this value was more than twice as high as that observed in the weakest cultivar in this respect, Brazowa. Different contents of this compound in the analyzed group of 12 genotypes (of Russian origin) were observed by [PERSON] et al. [14], who emphasized the pronounced cultivar variability in this regard. The cultivars Borealis and Indigo Gem tested by [PERSON] et al. [11] in Canada were characterized by total flavonoid content at the level of 699.29 and 638.55 mg QE-100 g\({}^{-1}\) fw, respectively. The same cultivars in Poland showed a similar content of this group of compounds, while flavonoid content in the cultivars Leningradskij Velikan and Nimfa (3.27 and 3.11 g\(\cdot\)kg \({}^{-1}\) fw, respectively), tested in the Czech Republic [14], was much lower compared to the results obtained in the present work. The opposite was found in Berry Blue, Borealis and Indigo Gem, for which [PERSON] et al. [16] obtained significantly higher values (1156.6, 1582.8 and 1128.5-1327.0 mg QE-100 g\({}^{-1}\) fw respectively) compared to the results in this study. Therefore, it should be noted that a large variation in the content of flavonoids may result from cultivar differences and growing locations and conditions, as also indicated by the authors cited above. The role of plant phenolics in the prevention against chronic diseases such as cardiovascular, diabetes and neurodegenerative diseases has been suggested in many studies. Honeysuckle berry fruit contains triterpenoic acids, \(\beta\)-carotene, catechol, flavonoids, chlorogenic acid and many other acids [39]. In the current study, the group of genotypes with a high total phenolic content included: clone 1-17-59, cvs. IndigoTreat, Czarna, Sinoglaska, Amphora, and Valhova, while low values of this trait were recorded in cultivars Aurora, Polar Jevel and Warta. The list of 19 cultivars in terms of total polyphenol content presented by [PERSON] et al. [39], indicating that cultivars of Canadian origin such as Aurora, Borealis and Honey Bee were characterized by a lower content of this group of compounds compared to cultivars of Russian origin. This general tendency was also confirmed in our research, with the exception of the cultivar IndigoTreat, where polyphenol content was the highest among the cultivars studied. In the study by [PERSON] et al. [40], the content of this group of compounds in Canadian cultivars ranged from 362.2 mg GAE:100 g\({}^{-1}\) fw to 471 mg GAE:100 g\({}^{-1}\) fw, while the values observed by us were close to or slightly above the upper range. [PERSON] et al. [12] showed that some genotypes analyzed in different locations were characterized by a similar level of total anthocyanin content, total phenolic content and antioxidant activity, while others significantly varied in this respect. For example, the cultivar Berry Blue, tested in Canada, showed a lower level of total phenolic content compared to the cultivar Indigo Gem [8], whereas in our research, it was Berry Blue that was more effective in this regard. In contrast, earlier studies by [PERSON] et al. [41] suggested that different cultivation conditions did not seem to significantly influence the content of this compound. Therefore, while the variability of chemical compositions in the cultivars tested under the same conditions results from their genetic diversity [42], additionally, changes in environmental conditions may also result in an increased or decreased level of their synthesis. Additional factors affecting the observed level of properties include different years (differences in climatic conditions) [34] and maturity stage of the fruit, as late-harvested fruits had significantly higher polyphenic content then early harvested berries [43; 44]. Moreover, [PERSON] et al. [15] found that the impact of the harvesting date on polyphenol composition was very distinct.