Seasonal changes of carbohydrate constituents in ponkan (Citrus reticulata Blanco)
1996
Mataa, M. (Kagoshima Univ. (Japan). Faculty of Agriculture) | Tominaga, S. | Kozaki, I.
The annual partitioning dynamics of assimilated photosynthates in a low yielding ponkan (Citrus reticulata Blanco cv. Yoshida) and a high yielding cultivar, satsuma mandarin (Citrus unshiu Marc.) were compared. Starch, soluble sugars and hemicellulose in all above ground tissues were monitored at monthly intervals over a period of one year. Ponkan showed a continuous decrease of sugars and starch in all tissues except for fruit maturity and approach of winter, there was a high accumulation of non-structural carbohydrates in the tissues. Maximum carbohydrate content in most tissues was reached in mid-winter (December to January). A close relationship was found between non-structural carbohydrate accumulation patterns in the new leaves and shoots and fruit growth rate indicating that low sink strength of the developing ponkan fruit and inefficient mobilization of non-structural carbohydrates from the current season's source leaves and mature wood caused low fruit set and yield in ponkan, in contrast to the satsuma mandarin fruit
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