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Article|25 Apr 2023|OPEN
RcSPL1–RcTAF15b regulates the flowering time of rose (Rosa chinensis)
Rui Yu1 , Zhiying Xiong1 , Xinhui Zhu1 , Panpan Feng1 , Ziyi Hu1 , Rongxiang Fang2,3 and Yuman Zhang2 , , Qinglin Liu,1 ,
1Department of Ornamental Horticulture, College of Horticulture, China Agricultural University, Beijing 100193, China
2National Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, and National Plant Gene Research Center, Beijing 100101, China
3University of Chinese Academy of Sciences, Beijing 101408, China
*Corresponding author. E-mail:,

Horticulture Research 10,
Article number: uhad083 (2023)
Views: 145

Received: 02 Aug 2022
Accepted: 18 Apr 2023
Published online: 25 Apr 2023


Rose (Rosa chinensis), which is an economically valuable floral species worldwide, has three types, namely once-flowering (OF), occasional or re-blooming (OR), and recurrent or continuous flowering (CF). However, the mechanism underlying the effect of the age pathway on the duration of the CF or OF juvenile phase is largely unknown. In this study, we observed that the RcSPL1 transcript levels were substantially upregulated during the floral development period in CF and OF plants. Additionally, accumulation of RcSPL1 protein was controlled by rch-miR156. The ectopic expression of RcSPL1 in Arabidopsis thaliana accelerated the vegetative phase transition and flowering. Furthermore, the transient overexpression of RcSPL1 in rose plants accelerated flowering, whereas silencing of RcSPL1 had the opposite phenotype. Accordingly, the transcription levels of floral meristem identity genes (APETALA1FRUITFULL, and LEAFY) were significantly affected by the changes in RcSPL1 expression. RcTAF15b protein, which is an autonomous pathway protein, was revealed to interact with RcSPL1. The silencing and overexpression of RcTAF15b in rose plants led to delayed and accelerated flowering, respectively. Collectively, the study findings imply that RcSPL1–RcTAF15b modulates the flowering time of rose plants.