Abstract
Seasonal changes of sucrose, glucose and fructose were monitored in the bark (phloem) and xylem in Ponkan mandarin ( Citrus reticulata Blanco cv. Yoshida). Sucrose was the most abundant sugar. A decline in bark sucrose content coincided with the major fruit abscission period. Stem girdling was carried out at anthesis (May), end of June drop (July), start of autumn (September) and in early winter (November). Girdling in July and September slightly increased leaf sugar content. At peak starch content (in winter), the September girdled treatment had the highest starch content. May girdling increased fruit set significantly and also improved fruit color. July and September girdling improved fruit size, but late girdling (November) had no effect on fruit size. Flowering and fruit set in the following year were closely related to starch content in the previous winter: they were highest in September girdled trees and lowest in May girdled trees.
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