Study on the Early Multiplicative Ratio in vitro of Acacia mangium Plus Trees

The technique of multiplicative and rooting ratio in vitro of 30 plus tree of Acacia mangium was studied. There are great difference among clones in multiplication and rooting at the early stage of tissue culture. The results show that 30 clones can be divided into 3 multiplicative types, i.e. fast, middle and slow multiplicative types. The fast one can reach to high monthly multiplicative ratio (2.18 times per month) after 13 to 15 months'introduction while it has good rooting property with 91.0 per cent. But the middle and slow one can't get the high monthly multiplicative ratio till they got 18 to 22 months' introduction.