Gene expression rewiring often contributes to phenotypic evolution between newly diverged species. Changes in gene expression patterns can be caused by mutations in either cis-regulatory regions (promoter) of the gene itself or trans-acting regulatory genes (transcription factors). However, the effects of cis-and trans-regulatory variants at the whole genome level of gene expression leading to phenotypic differentiation in floral organs during the closely related newly diverged species are not very clear.
