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Apple (Malus × domestica Borkh.) is economically the most important species  of genus Malus Miller. Developing new apple genotypes is carried out on a  large scale in many scientific institutes throughout the world. ‘Jonathan’ is  one of four cultivars which have been used as the most frequent progenitors  in apple breeding programmes worldwide. The paper presents six promising  apple selections bred at Fruit Research Institute, and ‘Jonathan’ as the  parental cultivar. The assessed selections derived from the crosses  ‘Jonathan’ × ‘Idared’ (J/3/60 and J/2/53), [‘Jonathan’ × J/54/53/59] ×  J/27/127/62 (J/4/106) and ‘Jonathan’ × J/54/53/59 (J/1/55, J/1/71 and  J/1/15). Major phenological properties (flowering phenophase and harvest  time), cropping and pomological properties (morphometrical and chemical  characteristics of fruits) were assessed. The highest fruit weight (J/2/53;  188.4 g) and yield per unit area (J/3/60; 34 t ha-1) were reported in  selections derived from the cross ‘Jonathan’ × ‘Idared’. Selections raised  from a cross between ‘Jonathan’ and J/54/53/59 have high quality fruits. The  highest soluble solids content was found in J/1/55 (15.3%), while the highest  total sugars and acids content was evidenced in J/1/71 (9.61%; 1.46%,  respectively)

Variability of properties of promising apple selections of the ‘Jonathan’ group