Transcriptomic Analysis Reveals That Exogenous Indole-3-Butyric Acid Affects the Rooting Process During Stem Segment Culturing of Cinnamomum camphora Linalool Type

Abstract Cinnamomum camphora linalool type ( C. type) is an economically important plant that contains abundant linalool. To explore the optimal concentration of exogenously applied indole-3-butyric acid (IBA) for root formation and development, morphological analyses were performed with plants after a 1-min soaking treatment five different concentrations IBA. When grown on medium (laterite ash) 60 days 3000 mg/L IBA, ratio number roots significantly higher than those obtained 0, 1000, 2000, or 4000 IBA treatment. After stem bases at key stages development (0, 14, 21, 28, 42 days) selected global transcriptome analyses. modified expression genes related to auxin, brassinosteroid, abscisic signalling transduction pathways. The rooting process reduced accumulation starch synthesis but promoted metabolism D-glucose. Our study identified optimum short segments regulate transcriptional level.