An integrated metabolome and transcriptome study of Lonicera macranthoides Hand.-Mazz, a traditional Chinese medicinal plant, has traced how its two main groups of medicinal compounds accumulate as its flowers develop. The plant is primarily enriched in chlorogenic acid (CGA) and hederagenin-based saponins, and its blooming flowers are the main medicinal tissue harvested. The researchers profiled flowers at five developmental stages: the green bud period (P1), the second white period (P2), the baby fat period (P3), the silver flower period (P4), and the golden flower period (P5), combining metabolite measurements with gene expression data to examine the regulatory mechanisms underlying biosynthesis.
The analysis found that CGA and saponin biosynthesis in developing flowers are co-regulated, with the highest levels of CGA, macranthoidin B, and total saponins detected at P2, the second white period. The authors suggest that this high accumulation indicates P2 may represent a suitable harvest stage for medicinal purposes. The study also documented substantial dynamic metabolic remodeling and transcriptional adjustments across the flower transitions, with the numbers of differentially accumulated metabolites and differentially expressed genes increasing as the flowers matured.
On the regulatory side, the results point to plant hormone signal transduction as playing crucial roles in regulating metabolic processes in developing flowers, while phenylpropanoid biosynthesis appears to be mainly regulated between stages P1 and P3. The team identified six major candidate regulatory genes for CGA and saponins: an NRT1 PTR FAMILY protein (LguiA_016350), an alcohol dehydrogenase (LguiA_005405), a thioredoxin (LguiA_003620), a choline transporter-like protein (LguiA_023132), and two proteins of unknown function (LguiA_031382 and LguiA_009216). These genes showed decreasing expression from P3 onward.
Three of the candidates, LguiA_031382, LguiA_023132, and LguiA_009216, displayed strong significant correlations with 3-hydroxy-3-methylglutaryl-coenzyme A synthase (HMGS), caffeoyl-CoA O-methyltransferase (CCoAMT), and 20 signaling components, linking them to core steps in the biosynthetic network. The authors state that the findings advance understanding of the molecular network regulating CGA and saponin biosynthesis in L. macranthoides. The work, published open access in BMC Plant Biology, provides a stage-resolved reference for future studies of this medicinal species, though the candidate genes are identified through correlation and expression profiling and their individual functions would require further experimental validation.
Subject of Research: Metabolome and transcriptome profiling of chlorogenic acid and saponin biosynthesis in developing flowers of Lonicera macranthoides
Article Title: Integrated metabolome and transcriptome profiling reveals the dynamic molecular control of chlorogenic acid and saponin biosynthesis in developing flowers of Lonicera macranthoides Hand.-Mazz
Article References: Li, J., Luo, C., Wang, H., Chen, S., Li, D., Wang, J., Wang, R., Tan, S., & Deng, L. (2026). Integrated metabolome and transcriptome profiling reveals the dynamic molecular control of chlorogenic acid and saponin biosynthesis in developing flowers of Lonicera macranthoides Hand.-Mazz. BMC Plant Biology. https://doi.org/10.1186/s12870-026-10174-9
Image Credits: AI Generated
DOI: 10.1186/s12870-026-10174-9
Keywords: Lonicera macranthoides, chlorogenic acid, saponins, metabolome, transcriptome, flower development, phenylpropanoid biosynthesis, plant hormone signaling, medicinal plants, gene expression, Integrated, profiling
News Source: Juliet Wilcox. (October 29, 2026). Study Maps How Chlorogenic Acid and Saponins Build Up in Developing Honeysuckle Flowers. Scienmag.
