## 3 Results and Discussion
[51], the total phenolic content was suitable for indirect selection for antioxidant activity in blueberry, indicating the possibility of also obtaining new blue honeyusckle genotypes with higher levels of phytochemical compounds. The content of total phenolics, flavonoids, vitamin C as well as antioxidant activity analyzed by means of cluster analysis (Figure 1) revealed three main cluster groups. The first one comprised only the breeding clone 1-17-59, which showed the remarkably high content of phenolics, flavonoids as well as antioxidant activity in both testing methods. The second one was composed of thee genotypes--Amfora, IndigoTreat and Bakczarskij Velikan--for which the values of the analyzed parameters were slightly lower. Two sub-clusters could be distinguished within the third cluster, the first one composed of 11 genotypes and the second one composed of 15 genotypes. It should be noted that within the analyzed clusters, there was no genotype clustering with a common country of origin, similar to what was observed by [PERSON] et al. [9]. \begin{table}
\begin{tabular}{c c c c c c} \hline  & **Flavonoids** & **Phenolics** & **Vitamin C** & **DPPH** & **ABTS** \\ \hline
**Flavonoids** & 1.0000 & 0.8797 * & 0.0838 \({}^{\text{ns}}\) & 0.8302 * & 0.7085 * \\
**Phenolics** & 0.8850 * & 1.0000 & \(-\)0.0343 \({}^{\text{ns}}\) & 0.9417 * & 0.7183 * \\
**Vitamin C** & \(-\)0.0246 \({}^{\text{ns}}\) & \(-\)0.1843 \({}^{\text{ns}}\) & 1.0000 & \(-\)0.0751 \({}^{\text{ns}}\) & \(-\)0.0615 \({}^{\text{ns}}\) \\
**DPPH** & 0.8551 * & 0.9520 * & \(-\)0.1911 \({}^{\text{ns}}\) & 1.0000 & 0.6584 * \\
**ABTS** & 0.7495 * & 0.8222 * & \(-\)0.2235 \({}^{\text{ns}}\) & 0.7435 * & 1.0000 \\ \hline \end{tabular}
* significant at \(p\leq 0.05\); \({}^{\text{ns}}\) not significant.  
\end{table} 
Table 3: Phenotypic (right side) and genotypic (left side) correlation matrix between bioactive compounds studied in 30 blue honeyusckle genotypes. The estimation of genetic components of variance allows for the understanding of the function of genes affecting the quantitative traits. Among them, the most important parameters are genotypic and phenotypic variances, heritability [52], and heritability coupled with high genetic advance as a percentage of the mean provides better information than single parameters [53]; the values of these parameters are presented in Table 4.  
Phenotypic variance values expressed by the phenotypic coefficient of variation (PCV%) for all traits were only slightly higher than genotypic variance values expressed by the genotypic coefficient of variation (GCV%), which indicated a low environmental impact on the level of these properties. The values of the heritability coefficient ranged from 0.88 for the assessment of antioxidant activity using the ABTS method to 0.99 for flavonoid content. These values should be considered high because [PERSON] [54] considered heritability above 0.5 already as high. Such high heritability values of the analyzed parameters are, according to [PERSON] et al. [50], useful to indicate the reliability of the phenotypic value in predicting the genetic value, since high values suggest a greater possibility of