Effect of exogenous hormone on formation and development of potato microtuber in vitro

The interaction effects of IAA, GA and BAP on the formation and development of potato microtuber in vitro was studied.The results showed that the interaction between IAA and GA could accelerate the growth of potato microtuber, the highest increment was 90.3%, but the interaction between IAA and BAP could restrain the growth; the interaction between IAA and GA had no significant effect on the formation and growth of plantlet root.BAP was a very important factor for potato formation, and the interaction between GA and BAP could accelerate the potato growth.The fresh weight and diameter of potato plantlets in Treatment 4 increased 163.8% and 46.4%respectively than those in Treatment 3.