Fruit Quality of Different 'Gala' Clones

The parameters of external fruit quality (colour, firmness, weight, diameter and height of fruits, length and thickness of fruit stalk) and internal fruit quality (content of individual sugars and organic acids) of the 5 apple 'Gala' clones ('Red Gala 95', 'Royal Gala', 'Mondial Gala', 'Schniga Gala', 'Galaxy') and the parental cultivar 'Gala' were evaluated in two cropping years. The proportion of the fruit surface colouring of the clones during both years was 80 %, while the parental cultivar exhibited from 60 to 80 % coloration. In the first years of cropping the fruits of the 'Schniga Gala' already regressed to yellow in higher proportion which is probably due to the instability of stronger red coloration. The clones differed in their stem lengths, but the differences in dimensions and firmness of the clones were not significant. The contents of fructose and sorbitol in the 'Gala' clones differed significandy during both years, while the contents of glucose and sucrose showed differences only in the first year. The contents of total soluble solids, malic and citric acids among the 'Gala' cultivar and its clones were also different in both years, but there were no differences in the contents of shikimic and fumaric acids. The comparisons between the clones and the parental cultivar in their external and internal qualities proved that favourable pedoclimatic conditions and application of suitable technologies enable the clones and the parental cultivar to develop fruits of good quality, with attractive appearance and sweet flavour. Among the studied clones, an excellent internal and external quality of fruits was reached at 'Royal Gala' and 'Galaxy'. Verschiedene Parameter der äusseren (Fruchtfarbe, -festigkeit, -gewicht und -höhe sowie Stiellänge und -dicke) und inneren Fruchtqualität (Gehalt an verschiedenen Zuckern und organischen Säuren) von Äpfeln der Ausgangssorte 'Gala' sowie fünf davon abstammender Klone ('Red Gala 95', 'Royal Gala', 'Mondial Gala', 'Schniga Gala', 'Galaxy') wurden über zwei Erntejahre erfasst. Der Anteil der Deckfarbe lag in beiden Jahren bei allen Klonfrüchten über 80 %, bei der Ausgangssorte zwischen 60 und 80 %. Die Fruchtfarbe des Klons 'Schniga Gala' tendierte schon im ersten Jahren zu Gelbtönen, was ein Zeichen für die Instabilität der roten Deckfarbe sein könnte. Signifikante Unterschied zwischen den Klonen konnten bei der Stiellänge nachgewiesen werden, die Unterschiede bei den Fruchtgrößeparametern und der Fruchtfestigk