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| Dorcoceras uthongensis Prajanban, Patumchartpat & Panvilai, in Prajanban, Patumchartpat, Akkarawongsapat, Napaswad et Panvilai, 2024. |
Abstract
Dorcoceras uthongensis, a new species of the genus Dorcoceras Bunge, is described. This new species is endemic to Uthong district, Suphan Buri province, Thailand, and differs from the other species by exhibiting capitate glandular hairs with globose unicellular head on the abaxial surface of the leaf. Additionally, it is classified as an endangered species (EN) according to IUCN criteria. The phylogenetic analysis based on nuclear ITS1-5.8S-ITS2 confirmed its placement within Dorcoceras. Moreover, we sought to explore the potential biological activities of the crude extract of this new species. We evaluated the aqueous extract of leaves which revealed antioxidant activity and no cytotoxicity indicating potential safety for further research and utilization. To examine the phytochemical composition, we performed an analysis using LC-MS/MS-QTOF. The result revealed the presence of flavonoids, alkaloids, phenolic compounds, and terpenes.
Keywords: Dorcoceras, New species, Trichome, Biological activity, Phytochemical composition, LC-MS/MS-QTOF
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| Dorcoceras uthongensis Prajanban, Patumchartpat & Panvilai, sp. nov. a) Habitat on the boulder of limestone karst, b) Lateral side of the flower is shown, c) Oblong unicellular head outside the corolla, d) Pale pink stigma, e) Detail of the reproductive organs, f) Pistil, g) Twisted capsule, h) Flower bud with pale purple petals, dorsally white, i) Glandular multicellular hairs on pedicel, j) Three staminodes are shown and k) Gland-tipped and eglandular multicellular hairs on calyx |
Dorcoceras uthongensis Prajanban, Patumchartpat & Panvilai, sp. nov.
DIAGNOSIS: Dorcoceras uthongensis is similar to D. geoffrayi and D. wallichii in colorless indumentum on the abaxial leaf surface but consisting of capitate glandular hairs with globose unicellular head (absent in D. geoffrayi and D. wallichii), as shown in Figure 5. Moreover, the sessile glandular trichomes observed in D. wallichii are absent in D. uthongensis. Also similar to D. brunneum in the leaf shape (Figure 4) but differing in the colorless indumentum abaxially (rusty brown in D. brunneum). The stigma of D. uthongensis is pale pink bilabiate, which is only found in this new species (Figure 3).
Jaran Prajanban, Wichai Patumchartpat, Radeekorn Akkarawongsapat, Chanita Napaswad, Sathit Panvilai. 2024. Phytochemical Composition and Biological Activities of Dorcoceras uthongensis (Gesneriaceae) - A New Species from the Limestone Karst of Suphan Buri, Thailand. Journal of Phytology. 16, 231–238. DOI: doi.org/10.25081/jp.2024.v16.9037
