Genome-Wide Analysis and Characterization of the Family Genes Related to Floral Scent Formation in .

Auxin plays a key role in different plant growth and development processes, including flower opening and development. The perception and signaling of auxin depend on the cooperative action of various components, among which auxin/indole-3-acetic acid (Aux/IAA) proteins play an imperative role. In a recent study, the entire gene family was identified and comprehensively analyzed in , a scented species used as an ornamental plant for cut flowers. Phylogenetic analysis showed that the gene family in is slightly contracted compared to , with low levels of non-canonical proteins. Sequence analysis of promoters showed numerous -regulatory elements related to various phytohormones. genes showed distinct expression patterns in different tissues and flower developmental stages, and some genes showed significant responses to auxin and ethylene, indicating that may play an important role in linking hormone signaling pathways. Based on the expression profiles, , , and , were selected as candidate genes and and were screened for further characterization. Downregulation of and by virus-induced gene silencing in flowers modified the total volatile compound content, suggesting that and play important roles in floral scent formation. The results presented here will provide insights into the putative roles of genes and will assist the elucidation of their precise roles during floral scent formation.