Total sugar content was indicated by the amount of three major sugars found in apple fruits, i.e., glucose, sucrose, and fructose. Sweetness index for each apple accession was estimated according to a modified method as previously described by Keutgen and Pawelzik . Briefly, the contribution of each major sugar found in apple fruits was calculated, considering that fructose and glucose are 1.7 and 0.75 times sweeter than sucrose, respectively. As a result, sweetness index = 0.75 [Glucose] + 1.0 [Sucrose] + 1.7 [fructose]
Total sugar content was indicated by the amount of three major sugars found in apple fruits, i.e., glucose, sucrose, and fructose. Sweetness index for each apple accession was estimated according to a modified method as previously described by Keutgen and Pawelzik . Briefly, the contribution of each major sugar found in apple fruits was calculated, considering that fructose and glucose are 1.7 and 0.75 times sweeter than sucrose, respectively. As a result, sweetness index = 0.75 [Glucose] 1.0 [Sucrose] 1.7 [fructose]
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