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MicroRNA-target Interactions: Important Signaling Modules Regulating Flowering Time in Diverse Plant Species

Successful reproduction of flowering plants requires the appropriate timing of the floral transition, as triggered by environmental and internal cues and as regulated by multiple signaling modules. Among these modules, microRNAs (miRNAs), the evolutionarily conserved regulators, respond to environmental and internal cues and network with other integrators of flowering cues. Moreover, miRNA signaling modules affect the timing of flowering in many plant species. Here, we comprehensively review recent progress in understanding the function of miRNAs and their target genes in flowering time regulation in diverse plant species. We focus on the role of the miRNA-target gene modules in various flowering pathways and their conserved and divergent functions in flowering plants. We also examine, in depth, the crosstalk by sequential activity of miR156 and miR172, two of the most-studied and evolutionarily conserved miRNAs in both annual and perennial plants.