Hormone Change During Dormancy and Flower Bud Differentiation Process in Lilium oriental × trumpet hybrid ‘ConcaD’Or’

doi:10.11924/j.issn.1000-6850.casb20191200950

Abstract

Abstract:

To explore the relationship between hormone change and dormancy and flower bud differentiation of lily, Lilium oriental × trumpet hybrid ‘ConcaD’Or’ was used as material, the stages of dormancy release and flower bud differentiation were identified according to carbohydrate change and microscopic observation, and the changes of hormones were analyzed by HPLC-MS technique. The results showed that the bulb dormancy was released after about 56 days at cold storage of 3℃, and then entered flower bud differentiation process at about 70 days, which was divided into three stages: flower bud differentiation initial stage, floret primordium differentiation stage and flower organ differentiation stage. Before dormancy release, GA₃/ABA increased, IAA/ABA and ZR/ABA remained at low level. After dormancy release, GA₃/ABA remained rising, IAA/ABA and ZR/ABA increased. At the initial stage of flower bud differentiation, the content of ZR increased, the content of GA₃ decreased and ZR/GA₃ went up sharply. At the stage of floret primordium differentiation, the content of ZR decreased, the content of GA₃ increased and ZR/GA₃ went down sharply. At the stage of flower organs differentiation, the contents of ZR and GA₃ showed an upward trend and ZR/GA₃remained stable. These results indicated that low level of IAA/ABA and ZR/ABA promoted dormancy maintenance, continuous increase of GA₃/ABA promoted dormancy release, the rising of ZR/GA₃ promoted the initiation of flower bud differentiation, while its decline promoted the formation of floret primordium. The results will provide references for postharvest storage and flowering regulation of Lilium oriental × trumpet hybrid ‘ConcaD’Or’.

Key words: lily, dormancy release, flower bud differentiation, hormone, HPLC-MS

CLC Number:

S682.2

Li Xin, Yang Liuyan, Chen Minmin, Wang Zhen, Xu Junxu, Yang Zhen, Zhang Yongchun. Hormone Change During Dormancy and Flower Bud Differentiation Process in Lilium oriental × trumpet hybrid ‘ConcaD’Or’[J]. Chinese Agricultural Science Bulletin, 2020, 36(35): 42-47.

Figures/Tables 4

References 26

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