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Ho Chi Minh City, Vietnam

Dang V.-S.,Institute of Tropical Biology
Taiwania | Year: 2015

A new variety, Markhamia stipulata (Wall.) Seem. ex Schum. var. canaense V.S. Dang var. nov. from Ca Na area of Thuan Nam District in Ninh Thuan Province, Southern Vietnam is described and illustrated. This variety is morphologically similar to Markhamia stipulata (Wall.) Seem. ex Schum. var. pierrei (Dop) Santisuk, but differs in having a longer corolla tube, shorter capsule, lesser number of leaflets and lateral veins. Furthermore, comparison of the diagnostic characters between this variety and the above mentioned related variety is also provided. © 2015 College of Life Science. All rights reserved. Source

Dang V.-S.,Institute of Tropical Biology | Tagane S.,Kyushu University | Toyama H.,Kyushu University | Tran H.,University of science
Annales Botanici Fennici | Year: 2015

Lasianthus yaharae V.S. Dang, Tagane & H. Tran (Rubiaceae) is described and illustrated here based on material discovered in the Hon Ba Nature Reserve, southern Vietnam. It is most similar to L. dalatensis but differs in having fewer secondary veins in the leaves, a larger calyx and larger flowers (corolla tube and corolla lobes), and a different flower color at anthesis. © 2015 Finnish Zoological and Botanical Publishing Board. Source

Pham T.-L.,University of Tsukuba | Pham T.-L.,Institute of Tropical Biology | Dao T.-S.,Ho Chi Minh City University of Technology | Shimizu K.,Toyo University | And 2 more authors.
Nova Hedwigia | Year: 2015

Dau Tieng Reservoir supplies drinking water for millions of people in southern Vietnam. In recent years, increased nutrient loading of the reservoir coupled with year-round warm weather has tended to enhance the growth of cyanobacteria, which are capable of producing hepatotoxin microcystins (MCs). In this study, cyanobacterial assemblages, isolated strains, and bloom samples from the Dau Tieng Reservoir were used for species identification, MC synthetase gene (mcy) analysis, and MC determination. Microcystin concentrations in both isolated strains and bloom samples were quantified by high performance liquid chromatography, whereas toxic and nontoxic strains were distinguished by three molecular markers: mcyA, mcyB, and mcyD. We isolated and characterized a total of 68 cyanobacterial strains belonging to 5 genera: Microcystis (59 strains), Dolichospermum (4 strains), Arthrospira (2 strains), Pseudanabaena (2 strains) and Cylindrospermopsis (1 strain). Cyanobacterial populations from the reservoir consisted of toxic and nontoxic genotypes. Dolichospermum nygaardii was morphologically identified and described for the first time in Vietnamese waters. Our results showed that mcyD is the best molecular marker for determination of toxicogenic strains. Microcystis included toxic and nontoxic genotypes. The MC concentrations from bloom samples and cultures were as high as 669 and 2129 μg g-1 dry weight, respectively. The results argue strongly for the implementation of a monitoring program for cyanobacteria and their toxins in the water to minimize potential health risks to animal and human populations. © 2014 J. Cramer in Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany. Source

Leong-Skornickova J.,The Herbarium | Ly N.-S.,Institute of Tropical Biology | Poulsen A.D.,University of Oslo | Tosh J.,Royal Botanic Garden Edinburgh | And 2 more authors.
Taxon | Year: 2011

A new genus of Zingiberaceae from Vietnam, Newmania N.S. Lý & Škorničk., with two species Newmania serpens N.S. Lý & Škorničk. and N. orthostachys N.S. Lý & Škorničk., is described and illustrated. Its relationship with Haniffia Holttum and phylogenetic position in the tribe Zingibereae is investigated using nrITS and trnK and matK plastid sequence data. The phylogenetic position of Kedhalia C.K. Lim, another recently described ginger genus from the same tribe, is also discussed briefly. Source

Bruggeman P.,Zwarte Ring 157 | Vuong T.B.,Institute of Tropical Biology | Rybkova R.,Prague Botanical Garden | Ponert J.,Prague Botanical Garden | Ponert J.,Charles University
Nordic Journal of Botany | Year: 2013

Arisaema claviforme P. Bruggeman, T. B. Vuong, R. Rybková & J. Ponert, a new species of Araceae, belonging to section Anomala, from Hòn Bà Nature Reserve, Khánh Hòa province in southern Vietnam is described, illustrated and compared with related taxa. Additionally, Arisaema simaicum Gagn., a species hitherto regarded as an endemic to southern Thailand is published as a new record for Vietnam and a short description and an illustration of this species is provided. © 2013 The Authors. Source

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