| Abstract: In order to explore the suitable concentration of gibberellin (GA3) for breaking dormancy of the
yam tubers, the local yam cultivar 'Liuyueshu' from Fujian province was used as experimental material, and different
concentrations (0, 100, 200 mg/L) of GA3 were used to compare the effects on tuber dormancy. The results showed
that both 100 and 200 mg/L GA3 treatments could rapidly and significantly increase the content of endogenous GA3
of the yam tubers, and also significantly changed the dormancy intensity and dormancy amplitude of the stem segment
as well. After treatment with 100 and 200 mg/L GA3, the dormancy intensity was shortened by 7.35 d and 10.05 d, and
the dormancy amplitude was shortened by 10.25 d and 12.25 d, respectively, and the shoots passed through dormancy
more intensively and sprouted orderly. The bud elongation accelerated with the increase of GA3 concentration, while
the concentration of GA3 reached 200 mg/L, the tuber buds displayed slender and weak. In conclusion, the optimum
concentration of GA3 to break the dormancy of tuber of 'Liuyueshu' was 100 mg/L, which could effectively shorten the
dormancy time, improve the sprouting regularity and help to cultivate strong seedlings of yam. |