Đorđe Boškov

The study evaluated the effects of six rootstocks on the leaf mineral composition and nutritional balance of four apricot (Prunus armeniaca L.) cultivars. The rootstocks comprised five seedling rootstock treatments (‘Green Gage’, ‘Belošljiva’, ‘MY-KL-A’, ‘Iroquois’, and ‘Crvena Ranka’) and one clonal rootstock (‘Myrobalan 29C’), while the evaluated cultivars were ‘Buda’, ‘Ruža’, ‘NS-4’, and ‘Novosadska Rodna’. The experiment was conducted in 2022 and 2023. Twenty-nine elements were analyzed in leaves collected 120 days after full bloom, of which 21 were detected and quantified. Rootstock significantly affected the concentrations of most mineral elements. Trees grafted onto ‘Belošljiva’ had the highest leaf concentrations of Ca, Mg, Zn, and Mn, whereas those grafted onto ‘Myrobalan 29C’ had the highest concentrations of K, P, and Fe. ‘MY-KL-A’ generally resulted in the lowest concentrations of several essential elements and the greatest nutritional imbalance, expressed as the sum of the absolute deviation from optimum percentage indices (ΣDOP = 360.50). The lowest ΣDOP value was recorded for ‘Belošljiva’ (231.85). Among the cultivars, ‘NS-4’ showed the most balanced mineral status (ΣDOP = 268.99), whereas ‘Novosadska Rodna’ showed the greatest imbalance (ΣDOP = 321.85). The leaf concentrations of several elements were higher in 2023 than in 2022, possibly in association with the greater and more evenly distributed precipitation recorded during the 2023 growing season. Trace and potentially toxic elements, including Al, Ba, Sr, Pb, Ni, Cr, and Co, were also quantified in the analyzed leaf samples. Overall, leaf mineral composition and nutritional balance were influenced by rootstock, cultivar, and year, with ‘Belošljiva’ providing the most favorable nutritional balance under the conditions of this study.

DoiFil - Repository of Digital Object Identifiers (DOIs) Issued by Faculty of Philology, University of Belgrade

DoiFil - Repository of Digital Object Identifiers (DOIs) Issued by Faculty of Philology, University of Belgrade

The phenotypic variability of 50 European plum ( Prunus domestica L.) cultivars from the germplasm collection of the Faculty of Agriculture in Belgrade was evaluated on the basis of 7 qualitative and 24 quantitative traits over three years. A great diversity between cultivars was found for all analysed traits. The results show that qualitative traits play an important role in the identification of cultivars, as each cultivar has a unique combination of scores. Among the quantitative traits, the greatest variation was found in yield efficiency (0.027–0.757 kg cm ⁻² ; CV = 67.0%), yield (4.4–35.7 kg tree ⁻¹ ; CV = 45.6%), maturity index (9.4–42.9; CV = 36.1%), titratable acidity (5.2–17.2 g l ⁻¹ ; CV = 29.4%) and fruit weight (16.5–73.7 g; CV = 29.6%). Principal component analysis (PCA) revealed that the traits related to ripening time, fruit weight, quality and yield accounted for most of the observed variability. Cluster analysis (CA) grouped the analysed cultivars into two main clusters with several subclusters. The results of the present work provide important information on how to best utilise these plum cultivars and can help breeders to select the most diverse cultivars with the best fruit and yield characteristics to be crossed in future breeding programmes.

The influence of three cultivars (‘Carmen’, ‘Kordia’ and ‘Regina’) grafted on six rootstocks (Mahaleb, ‘Colt’, ‘Oblacinska’, ‘M × M 14′, ‘Gisela 5′ and ‘Gisela 6′) on the phenolic profile of sweet cherry fruits was studied during a two-year period. All the individual phenolic compounds were detected using high-pressure liquid chromatography with diode-array detection coupled with mass spectrometry (HPLC-DAD-MSn). In all the examined samples, 54 compounds were identified and divided into five phenolic classes: anthocyanins (4 compounds), flavonols (7), flavanols (11), flavanones (4), and hydroxycinnamic acids (28). Anthocyanins (58%) and hydroxycinnamic acids (31%) showed the greatest amounts in all the examined fruit samples. PCA analysis revealed that among the cultivars, ‘Kordia’ showed the highest phenolic content. Regarding rootstocks, the lowest values of the most important phenolic compounds were obtained in fruits from trees grafted onto the seedling rootstock Mahaleb. Among the clonal rootstocks, the vigorous ‘Colt’ and dwarf ‘Gisela 5′ promoted the highest values of the evaluated phenolic compounds in the cultivars ‘Kordia’ and ‘Carmen’, while the dwarf ‘Oblacinska’ and semi-vigorous ‘M × M 14′ induced the highest values in the cultivar ‘Regina’. By evaluating the influence of cultivars and rootstocks on the phenolic content in fruit, it has been proven that the cultivar has the most significant influence. However, the rootstock also influences the content of a large number of phenolic compounds. The selection of an adequate cultivar/rootstock combination can also be a powerful tool for improving the phenolic content in fruits, and consequently the nutritional value of sweet cherry fruits.

Fenološke osobine, prinos i kvalitet ploda srednje ranih sorti trešnje na području Beograda Preuzmite PDF Autori: Dragan Milatović Gordan Zec Đorđe Boškov Dejan Đurović Boban Đorđević Naziv časopisa: Voćarstvo = Journal of Pomology Godina: 2022 Tom: 56 Broj: 211-212 Strane: 39-46 Jezik: Srpski DOI: 10.65845/pomology.2022.56.211_212.4 Rezime: U periodu od pet godina (2017‡2021) na području Beograda...

Biološke i proizvodne osobine ranih sorti trešnje u beogradskom Podunavlju Preuzmite PDF Autori: Dragan Milatović Gordan Zec Đorđe Boškov Dejan Đurović Boban Đorđević Naziv časopisa: Voćarstvo = Journal of Pomology Godina: 2021 Tom: 55 Broj: 209-210 Strane: 7-14 Jezik: Srpski DOI: 10.65845/pomology.2021.55.209_210.1 Rezime: U periodu od pet godina (2017-2021) na području Beograda ispitivane su fenološke...

The study examined the influence of five vegetative rootstocks on the flower bud sensitivity to frost during the period of ecological dormancy and the most important biological and pomological properties of the ?Carmen? sweet cherry cultivar. The ?Carmen? cultivar was grafted on the following rootstocks: ?Colt?, ?Gisela 5?, ?Gisela 6?, ?MaxMa 14? and ?Oblacinska cherry?. Winter frosts occurred during the ecological dormancy of sweet cherry trees. The intensity of frost was between -5?C and -7?C. The percentage of damaged and non-damaged flower buds per fruiting branch was determined by counting (50 flower buds per tree were taken from every part of the canopy and fruiting branches). The highest rate of damage of flower buds was in trees grafted on ?Oblacinska cherry?, an average of 77.2% of flower buds, while the lowest was observed in trees grafted on ?MaxMa 14?, an average of 24.3% of total flower buds. The significantly higher sensitivity of flower buds was found in spur fruiting branches compared to lateral fruiting branches. The fruits of the ?Carmen? cultivar had the earliest ripening on rootstocks ?Gisela 5? and ?Oblacinska cherry?. The ?Carmen? cultivar had the highest yield per tree on the ?MaxMa 14? rootstock, while the lowest yield rate was observed in ?Oblacinska cherry?, 5.4 kg and 1.9 kg, respectively. The highest mass of fruits was noticed in trees grafted on ?Gisela 6?, an average of 11.6 g, while the smallest was recorded in trees grafted on ?Gisela 5?- an average of 9.4 g.