To investigate an effective way to break dormancy in Lily bulbs, Siberian Lily bulbs were used to study the effects of low temperature and GA3 on the morphological and physiological changes, the change of endogenous GA3 in different temperature and different parts of lily bulbs. The results showed that, the ratio of bud length and total height of bulbs reached 67.954%, the bud growth point located at the 2/3 vertical height of bulb, and the time spent on dormancy releasing was minimum under the treatment of low temperature (5℃) and GA3 (0.15 g·L-1) for 35 d. Under the condition of low temperature (5℃), the starch degradation rate was fastest in bulbs with the treatment of 0.15 g·L-1 GA3 in 0-14 d, moreover, the soluble sugar content and reducing sugar content reached the maximal value at the 35th d. The endogenous GA3 content was changed noticeably in inner scales and buds under low temperature condition, and the changes was more visible with the decreasing of temperature. Consequently, low temperature and GA3 treated together have significant effects on dormancy breaking in bulb of Siberia Lily, the optimum concentration of GA3 was 0.15 g·L-1, the optimum temperature was 5℃. The endogenous GA3 content was higher with low temperature treatment in inner scales and buds, and had the most evident escalating trend; however, the endogenous GA3 content was lower in outer scales and roots, and had a less change trend. It will be seen from this that, the kernel of dormancy breaking in the whole bulb might be the terminal bud and inner scales.
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