Chemical and morphological characteristics of developing fruits from old clonev. nucellar Shamouti orange trees

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Abstract
Summary In nucellar trees fruit size was significantly smaller, the rind thinner, the acid content of fruit juice significantly lower, and the TSS/acid ratio higher than in fruit from old clone trees. No significant differences were found in the contents of free amino acid in the fruit juices of the two types. The juice of the nucellar fruits contained a higher level of putrescine and a lower level of potassium than the juice of old clone fruits. The activity of arginine decarboxylase was higher in the flavedo of nucellar fruits, and spraying intact young fruits (2 months old, 20 mm in diameter) with 0.025 M arginine in the orchard caused a greater increase in the arginine decarboxylase activity in the flavedo of nucellar fruits, than in fruits of old clone trees.