The mechanism how endodormancy is maintained in Rosaceae fruit trees-possible roles of sorbitol in inhibiting the resumption of bud growth

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In order to elucidate the possible roles of carbohydrate in Japanese pear(Pyrus pyrifolia,'Kosui') during endodormancy, seasonal changes of carbohydrate concentrations and the activities of sorbitol-and sucrose-metabolizing enzymes were investigated in the lateral flower buds and current shoots. We found that sorbitol and sucrose metabolisms in these tissues changed drastically during endodormancy phase, and thus assume that pear flower buds regulate endodormancy by modulating the systems for sorbitol-and sucrose-catabolism depending on the dormancy stage. We also discuss the possible inhibitory effect of sorbitol on flower bud growth during endodormancy.