Control of chrysanthemum flowering through integration with an aging pathway

Qian Wei, Chao Ma, Yanjie Xu, Tianle Wang, Yiyu Chen, Jing Lü, Lili Zhang, Cai-Zhong Jiang, Bo Hong () and Junping Gao ()
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Qian Wei: China Agricultural University
Chao Ma: China Agricultural University
Yanjie Xu: China Agricultural University
Tianle Wang: China Agricultural University
Yiyu Chen: China Agricultural University
Jing Lü: China Agricultural University
Lili Zhang: China Agricultural University
Cai-Zhong Jiang: Agricultural Research Service
Bo Hong: China Agricultural University
Junping Gao: China Agricultural University

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Age, as a threshold of floral competence acquisition, prevents precocious flowering when there is insufficient biomass, and ensures flowering independent of environmental conditions; however, the underlying regulatory mechanisms are largely unknown. In this study, silencing the expression of a nuclear factor gene, CmNF-YB8, from the short day plant chrysanthemum (Chrysanthemum morifolium), results in precocious transition from juvenile to adult, as well as early flowering, regardless of day length conditions. The expression of SQUAMOSA PROMOTER BINDING-LIKE (SPL) family members, SPL3, SPL5, and SPL9, is upregulated in CmNF-YB8-RNAi plants, while expression of the microRNA, cmo-MIR156, is downregulated. In addition, CmNF-YB8 is shown to bind to the promoter of the cmo-MIR156 gene. Ectopic expression of cmo-miR156, using a virus-based microRNA expression system, restores the early flowering phenotype caused by CmNF-YB8 silencing. These results show that CmNF-YB8 influences flowering time through directly regulating the expression of cmo-MIR156 in the aging pathway.

Date: 2017
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DOI: 10.1038/s41467-017-00812-0

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