Abstract: Histological differentiation of flower buds in different nodes of new shoots in 6 years old potted Averrhoa carambola was studied. Also carbohydrate contents in these nodes were assayed. The results showed that when the second node of the bud in new shoot became red, buds in this new shoot had almost been in histological differentiation stage except for the apical bud. Soluble sugar contents in phloem and xylem in shoots in which the first or the second bud became red were lower than those shoots in which the third or fourth bud became red. Soluble sugar and starch levels in the first node in water shoots were high, and those in the third and fifth nodes were low. The results indicated that new shoots still accumulate carbohydrates when its buds were in histological differentiation stage.

Key words: Averrhoa carambola, Flower bud differentiation, Histological differentiation, Carbohydrate