This study included twenty-three samples of minor fruit species and twenty-three plum cultivars. First of all, the pomological properties of the plum cultivars were assessed, where the cultivar ‘Aphrodite’ was determined as the cultivar with the biggest fruits (56.6 g). The selected nutritional properties were subsequently determined in all forty-six samples. The highest value of the total soluble solids in the plums was 27.3 % in ‘Stanley’ (Prunus domestica) and 26.1 % in ‘Krasavica’ (Sorbus aucuparia) in the minor fruits; the highest total content of ascorbic acid in the plums was 83.3 mg/100 g in ‘Stanley’ (P. domestica) and 622.9 mg/100 g in ‘Krasavica’ (S. aucuparia) in the minor fruits; the highest total phenolic content in the plums was 429.8 mg GAE/100 g in ‘Fortune’ (Prunus salicina) and 45.3 mg  GAE/100 g in the minor fruits and 983.9 mg GAE/100 g in ‘Vydubecký’ (Cornus mas); the highest total flavonoid content in the plums was 291.5 mg CE/100 g in ‘Fortune’ (P. salicina) and 544.7 mg CE/100 g in ‘Nero’ (Sorbus melanocarpa) in the minor fruits, and the highest total antioxidant activity in the plums was 809.5 mg TE/100 g in the hybrid ‘SLE2014/2’ (P. domestica × P. salicina) and 849.8 mg TE/100 g in ‘Amfora’ (Lonicera edulis) in the minor fruits.

Fruits are a rich source of vitamins and antioxidants and their consumption is important for human health. Anthocyanins contribute to antioxidant characteristics in colourful fruits, especially with blue, purple and red tones of colour. The aim of this work was to study the correlation between anthocyanin content and the external colour of plums. European (Prunus domestica) and Asian (Prunus salicina) plum plum and the apricot (Prunus armeniaca) -pluotswere chosen for this investigation. Results showed that total anthocyanin content in fruits ranged between 0.2 and 217.0 mg kg -1 fresh weight (FW) among varieties. High anthocyanin values were measured in cultivars derived from the Japanese plums 'Black Amber' and 'Black Star', however, the highest values were surprisingly measured in the pluot 'Flavorich pluot ® '. Anthocyanin values for European plum cul--1 FW. The colour of the fruit was measured using the colour scale set by the Commission Internationale de L'Eclairage (CIELAB) and from chromatic parameters L*, a*, b* the chroma parameter (C * ab ), hue angle (h°a b )and colour index of red grapes (CIRG) were calculated. Correlation of the colour parameters with the anthocyanin content in plum fruits was determined and it was found that CIRG is a suitable comparison parameter with exponential positive correlation to anthocyanin content. The present work highlights that colour parameters, especially CIRG, are a good tent with using founded regression function. This method could be used to obtain an overview about healthy substances of fruit without its destruction or using chemical analyses.

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The most commonly used phytohormone to reduce the impact of drought is 24‑epibrassinolide (EBR). In this study, EBR was applied over two years on young rootstocks of peach (B‑VA‑1) and myrobalan (Vanovice myrobalan) seedlings. Young rootstocks were treated by EBR at different concentrations, IAA and a mixture of EBR with IAA. The best results in seedling height of Vanovice myrobalan in both years had the treatment of 0.05% IAA, 549.69 mm (2016) and 553.77 mm (2017). On the other hand, on the crown root thickness was affected the most in 2016 by treatment of EBR 0.06 ppm (5.5 mm) and in 2017 by EBR 0.01 ppm (7.5mm). At B‑VA‑1 rootstock, the highest seedlings in 2016 were measured after EBR + IAA treatment (1573.18 mm) and in 2017 after IAA treatment (682.75 mm). The highest thickness of the crown root was recorded in 2016 after EBR and IAA (17.76 mm) and in 2017 after EBR 0.1 ppm (8.08 mm) treatments. At more than half of the treatments the control variant was evaluated as a variant with the least satisfying results. According to the results EBR and IAA are possibly increasing the quality of the rootstocks in conditions of a nursery without an irrigation.