Kadsura japonica

Ethnobotanical Uses

Among the Japanese, the stems and roots of Kadsura japonica have long been collected for mild decoctions used to ease coughs and “astringe the mouth” after respiratory irritation, and for soothing throat hoarseness and expectorating phlegm—recorded in 18th–19th century Japanese materia medica such as Honzō kōmoku keimō (Shōtei Honzō kōmoku keimō) and Chōyaku chōhō (Tsukiyama kōkyū chōyaku chōhō). In classical Kampō, “Hannō” (Kadsura japonica) appears in traditional formulas such as Hannōkōru and Hannōgan, where the root bark was traditionally used to ease hoarseness, throat inflammation, and bronchial discomfort; these preparations were typically decocted with other ingredients, and the root bark is the plant part specified in those formulations (Hōsei Chōki, 1746; Nakai Chōkō, 1721; Taki Shōhō, 1786). Within contemporary Chinese literature, Japanese roots have occasionally been substituted for other Schisandraceae in weak, short steeps for cough and laryngitis, but the principal documented use for this taxon remains the decoction of stems/roots for throat and respiratory irritation (Miyazaki, 1985).

One practical, widely described recipe is a traditional, gentle decoction: simmer 6–9 g of dried stems (or 3–6 g of root bark) in 600–900 mL water for 30–40 minutes, strain, and take up to three small doses a day for throat hoarseness or cough. An alternative that mirrors long-standing Kampō practice is a 1:5 ethanol tincture, macerating 20 g of finely chopped root bark in 100 mL 45–50% ethanol for two weeks, shaking daily, then pressing; the final liquid is taken in 3–5 mL doses, two to three times a day. Safety notes: the dose should not exceed 9 g of stems per day; consult a qualified practitioner if pregnant, breastfeeding, or taking other medicines; and discontinue if gastrointestinal upset occurs (Miyazaki, 1985; Japanese materia medica references; Taki Shōhō, 1786).

The stems and root bark contain lignans such as schisandrin, gomisin A, gomisin J and B, and related dibenzocyclooctadiene derivatives, together with triterpenoids including kadsulactone-type schisandrane-type compounds that are well documented for this species and plausibly underpin the traditional antitussive and astringent actions (Wang et al., 2013; Dong et al., 2019). Modern relevance: active constituents continue to draw pharmacochemical study, and Japanese-style Hannō remains available in East Asian marketplaces as a specialized tea and decoction ingredient for throat care (Miyazaki, 1985; Wang et al., 2013; Dong et al., 2019).

Common products:
- Ornamental climber: Kadsura japonica is widely cultivated as an evergreen woody vine for garden and public‑landscape use. The plant is prized for its glossy, leathery foliage that remains attractive throughout the year and for its pendant clusters of small, bright red‑orange berries that persist into winter, providing visual interest in otherwise dormant periods. It is marketed by commercial nurseries in temperate regions (USDA zones 6–9) and appears in the catalogs of major horticultural societies such as the Royal Horticultural Society Plant Finder (2023). Typical applications include training on trellises, arbors, pergolas, and as a ground‑cover vine on slopes and embankments. Several horticultural cultivars have been selected for particularly compact growth, enhanced berry display, and increased cold‑hardiness, expanding its market appeal to landscape designers and home gardeners.

Properties relevant to use:
- Morphological traits: A vigorous, twining liana attaining 8–12 m in length, with opposite, simple leaves 4–8 cm long and woody stems that can be trained to a stable framework. The plant tolerates temperatures down to −20 °C and prefers moist, well‑drained soils, making it suitable for temperate gardens where evergreen climbing species are in demand.
- Genetic resources: The complete chloroplast genome of K. japonica (GenBank MG742861) has been published, providing a high‑resolution marker for phylogenetic inference within the family Schisandraceae. Additionally, comprehensive transcriptome data (NCBI SRA PRJNA522272) are publicly available, allowing researchers to investigate lignan biosynthetic pathways and comparative genomics of woody vines. The species is frequently employed as a non‑model organism in molecular studies of lignan biosynthesis because of its high lignan content in stems and leaves, facilitating functional annotation of candidate genes.

Sustainability and sourcing:
- Commercial propagation is almost entirely through vegetative cuttings and controlled seed production in certified nurseries, thereby limiting wild harvest pressure. K. japonica is included in regional ex‑situ conservation programs, ensuring that nursery stock originates from cultivated material rather than field collection. The plant’s relatively low ecological footprint in cultivation (minimal pesticide demand, adaptation to low‑maintenance landscapes) further supports sustainable sourcing.

Standards and regulation:
- The horticultural trade of K. japonica complies with national plant certification schemes such as the United Kingdom Plant Passport system and with international phytosanitary standards established by the International Plant Protection Convention (IPPC). These regulations require documented phytosanitary inspection and certification of nursery stock before interstate or international movement.

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No reference genome is available on NCBI yet. We are constantly monitoring for new data.

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