RNA sequencing of the regulatory network of ginsenoside biosynthesis under Ro stress in the hairy roots of Panax ginseng

ABSTRACT: Panax ginseng C.A. Meyer is a precious Chinese herbal medicine belonging to the Araliaceae family. Because ginseng is extremely taboo, it seriously restricts the sustainable development of the ginseng industry. The allelopathic effect of triterpenoid saponins is one of the important incentives for continuous cropping disorders. However, there are few studies on the mechanism of allelopathic autotoxicity of triterpenoid ginsenosides. Therefore, this study took ginseng hairy roots as the research object, exogenously added ginsenoside Ro to regulate the growth of hairy roots, and measured the changes in its physiological and saponin content. It was found that ginseng hairy roots grew significantly under Ro-0.5 mg/L stress. Inhibition, the specificity of root tip cell injury was obvious, promoted the accumulation of endogenous hormones IAA and SA, and inhibited the accumulation of ABA and JA. The accumulation of ginsenosides was significantly inhibited (except Rg3) under Ro-0.5 mg/L stress. The mRNA analysis of the Ro-0.5 mg/L group and CK group showed that the differentially expressed genes were mostly concentrated in the hormone signal transduction pathway. The genes ARF7 and EFM were up-regulated, and XTH23 and ZOX1 were down-regulated, which can be used as important candidates for hormone-responsive continuous cropping disorders. Gene. 74 differentially expressed miRNAs were identified based on miRNA sequencing, of which 22 were up-regulated and 52 were down-regulated. The target genes of ptc-miR156k_L+1, mtr-miR156b-5p, gma-miR156a_R+1, and mtr-miR156e were all TRINITY_DN14567_c0_g4, TRINITY_DN14567_c0_g4 is a gene in the plant hormone signal transduction pathway, and the four miRNAs are all negatively correlated with mRNA, indicating that ptc-miR156k_L+1, mtr-miR156b-5p, gma-miR156a_R+1, and mtr-miR156e are very likely involved in ginseng Response to continuous cropping disorders and regulation of ginsenoside synthesis. Our findings will provide a useful platform for unraveling the continuous cropping barrier of ginseng and new insights into the genetic engineering of plant stress responses.

ORGANISM(S): Panax ginseng

PROVIDER: GSE212097 | GEO | 2022/08/27

REPOSITORIES: GEO