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Prohexadione-calcium effects on the quality of 'Royal Gala' apple fruits

AuthorsMata Bordonaba, Ana Pilar CSIC; Val Falcón, Jesús CSIC ORCID CVN ; Blanco Braña, Álvaro CSIC
Issue Date2006
PublisherHeadley Bros
CitationJournal of Horticultural Science and Biotechnology 81(6): pp. 965-970
AbstractTo study the effects of prohexadione-calcium (Pro-Ca) on fruit quality, an experiment was performed in 2002 in which trees were treated with two different concentrations of Pro-Ca and left with different crop-loads. Increasing levels of thinning resulted in smaller yields, but greater fruit sizes, which followed a curvilinear pattern when plotted against crop-load. The soluble solids content and titratable acidity of fruits decreased linearly with increasing crop-load. Fruit skin chromaticity values also changed. Luminescence increased, while a* values decreased linearly with increasing crop-load, indicating more reddish and darker coloured fruits on trees subjected to very heavy thinning. In addition, the concentrations of soluble sugars in fruits changed with the level of cropping; fructose and glucose concentrations increased with crop-load, while sorbitol and sucrose decreased. The application of Pro-Ca shortly after full-bloom inhibited shoot elongation growth, but did not result in changes in yield or in any of the fruit quality parameters analysed.
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