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Control of chrysanthemum flowering through integration with an aging pathway
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Journal Article
Control of chrysanthemum flowering through integration with an aging pathway
2017
Overview
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.
The mechanisms by which plant age regulates flowering remain incompletely understood. Here the authors show that age dependent regulation of SPL transcription factors by miR156 influence flowering via control of NF-YB8 expression in Chrysanthemum.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ Age
/ Aging
/ Humanities and Social Sciences
/ miRNA
/ Regulatory mechanisms (biology)
/ RNA
/ Science
/ Viruses
