Breaking Dormancy in Micropropagated Bulblets of Lilium japonicum Using Gibberellic Acid₄

Abstract

Two sizes (4-8 and 8-12 mm diam.) of micropropagated bulblets were immersed in 0 (water), 2, 20 and 200 ppm gibberellic acid₄ for 2 and 20 hrs or exposed to 5°C for 60 days. Subsequently, the bulblets were grown at 25°C under a 12-hr photoperiod for 60 days. In both sizes, although bulblets immersed in 200 ppm were emerged as chilled and those had more scale leaves than chilled, the leaves were small and the weight of bulblet were not decreased.