https://dspace.ctu.edu.vn/jspui/handle/123456789/63349 2026-03-12T19:56:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/121007 Title: Chemical composition of the needle and cone essential oils of Pinus fenxeliana (Pinaceae) from Vietnam Authors: Tran, Huy Thai; Nguyen, Thi Hien; Trinh, Xuan Thanh; Nguyen, Quang Hung; Paoli, Mathieu; Bighelli, Ange; Casanova, Joseph Abstract: The needle and cone essential oils of Pinus fenzeliana Hand-Mazz. (Pinus kwangtungensis Chun & Tsiang) collected in Hang Kia-Pa Co Nature Reserve, Hoa Binh province were obtained by hydrodistillation and analyzed by a combination of GC-FID, GC-MS and NMR (Gas Chromatography/Gas Chromatography-Mass Spectrometry/Nuclear Magnetic Resonance (NMR) analysis). The oil yields were 0.2% and 0.37% respectively (v/w on dry weight basis). Twenty-seven compounds were detected in both needle and cone oils, accounting for 98.0% and 98.2% of the whole composition, respectively. The main components identified in the needle oil were α-pinene (20.7%), β-pinene (11.3%), d-3-carene (32.2%), limonene (8.0%) and E-β-caryophyllene (7.1%). The cone oil contained mainly α-pinene (19.3%), β-pinene (45.4%), d-3-carene (3.5%), limonene (12.7%) and E-β-caryophyllene (3.4%). This is the first report on the chemical composition of the cone essential oil of P. fenzeliana from Vietnam. 2023-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/121006 Title: An updated enumeration of Bambusoideae in Central Highlands, Vietnam Authors: Nong, Van Duy; Tran, Thai Vinh; Vu, Kim Cong; Dang, Thi Tham; Hoang, Thanh Truong; Tran, Van Tien Abstract: Bamboos are widely distributed in a variety of habitats in the Central Highlands. Different researchers treat species differently, leading to ambiguous reporting of generic and infrageneric taxa. Following extensive research, this paper is an updated enumeration report on the bamboos that have been found there. The result has recorded 29 species of bamboo belonging to 15 genera. The Bambusoideae grow naturally in almost all regions, in an altitudinal range that extends from 200 m up to 2,160 m. Bamboo in the Central Highlands is distributed in three vegetation types: degraded natural forests in valleys and mountain gorges, along rivers (twenty-one species); primary forest, mixed with broadleaved trees (six species); and dry dipterocarp forest (two species). 2023-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/121005 Title: Molecular phylogeny of Convallarioideae (Asparagaceae), with emphasis on Vietnamese species Authors: Le, Thi Mai Linh; Ly, Ngoc Sam; Pham, Van The; Nguyen, Phuong Hanh; Tran, Duc Binh; Dong, Li-Na; Averyanov, Leonid V.; Tanaka, Noriyuki; Nguyen, Khang Sinh Abstract: With the aim of inferring phylogenetic relationships among 86 species (including 45 species from Vietnam) mostly of the subfamily Convallarioideae (=Nolinoideae) (Asparagaceae sensu APG IV), we analyzed their chloroplast DNA sequences (rbcL and trnL-F) by both Bayesian inference (BI) and maximum likelihood (ML) methods. Our dataset included six of the seven tribes classified in this subfamily; Convallarieae, Dracaeneae, Liriopeae Nolineae, Polygonateae and Rusceae (Eriospermeae not examined). Our study supported the sisterhood between Convallarioideae and Asparagoideae and the monophyly of all the tribes except Polygonateae. Within the Convallarioideae we examined, Dracaena formed the basalmost clade. Theropogon did not positively nest in any of the tribes including Convallarieae in which it had often been classified. It was weakly defined as the second basalmost branch. Ruscus (Rusceae) nested in Polygonateae as the sister to Maianthemum, hence Polygonateae was recognized here as paraphyletic. Nolineae was discordant in position between BI and ML analyses, probably reflecting the limited molecular markers we examined. In both BI and ML analyses, all genera of Liriopeae and Convallarieae were monophyletic and their intergeneric relationships were consistent. In Liriopeae, Liriope was sister to the clade of Ophiopogon + Peliosanthes. In Convallarieae, Aspidistra + Tupistra formed the sister clade to Reineckea + Rohdea. Interspecific relationships within these genera were, however, not clearly resolved, except for several pairs of sister species. We also briefly discussed some of the resultant phylogenetic relationships from the morphological and/or evolutionary aspects. 2023-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/121004 Title: Chemical constituents of some essential oils bearing plants growing wild in Vietnam Authors: Nguyen, Phuong Hanh; Nguyen, Thi Hien; Nguyen, Quoc Binh; Dinh, Thi Thu Thuy Abstract: The essential oils of three plants were isolated by hydrodistillation and their constituents were analyzed by gas chromatography-mass spectrometry/flame ionization detection (GC/MS-FID) method. 29 compounds representing 99.00% of the total oil of inflorescences of Zingiber pellitum were identified, consisting mainly of α-pinene (5.34%), β-caryophyllene (39.13%) and α-humulene (36.69%). For Basilicum polystachyon, 41 and 37 components were identified in the leaf and flower oils, accounting for 91.32% and 92.44% of the total oils, respectively. Germacrene D (16.33% and 16.32%), germacrene B (14.95% and 16.23%), α-cubebene (13.38% and 19,04%), α-copaene (5.81% and 5.77%), δ-cadinene (4.78% and 4.18%), β-cis-elemene (4.34% and 4.66%), and γ-elemene (4.31% and 4.72%) were the major constituents in both oils. For the leaves of Litsea bavienes, 40 components were identified, representing 91.73% of the total oil contents, in which hepten-3-one (70.46%) was the most abundant compound in this oil. The chemical constituents of essential oils from Z. pellitum (inflorescences), B. polystachyon (leaves and flowers) and L. baviensis (leaves) were being reported for the first time. 2023-01-01T00:00:00Z