Your search for articles by authors with the surname Nguyen has found 15 articles.

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Van Du Nguyen, Thomas B. Croat A new species of Typhonium (Araceae) from Vietnam (Buy)
 ABSTRACT: The paper describes a single new species of Typhonium, T. buense Nguyen Van Dzu & Croat. It is believed to be endemic to Vietnam. The principle author, Nguyen Van Dzu, has been engaged in studies of the Araceae of Vietnam for several years; he conducted field work with the second author in Vietnam in 1995. A recent collection of Typhonium made by the principle author has proven to be new to science.
Makoto Tahara, Viet Xuan Nguyen, Hiromichi Yoshino Karyotype analyses on diploid and tetraploid of Alocasia odora K. Koch (Buy)
 ABSTRACT: The karyotypes of diploid (2n = 2X 28) and tetraploid (2n = 4x = 56) forms of Alocasia odora (Roxb.) K. Koch were analyzed to determine their cytological relationship. The chromosome length and morphology were found similar between the two ploidy types. Phylogenetic relationship investigated by polymorphism of 13 enzyme systems also suggested closeness of the two ploidy types of A. odora.
Makoto Tahara, Viet Xuan Nguyen, Hiromichi Yoshino Isozymes analyses of Asian diploid and triploid taro (Buy)
 ABSTRACT: In order to investigate phylogenetic relationships between diploid and triploid taros, Colocasia esculenta (L.) Schott, 13 enzyme systems were analyzed for isozyme variations using 59 accessions collected in Nepal and Yunnan Province of China. A total of 115 banding positions were discovered, which successfully differentiated most of the accessions. Isozyme bands specific to triploids were observed only at five out of 115 positions, indicating autopolyploid origin of the triploids: almost all isozyme variations in triploids are derived from those in diploids. The Wagner parsimony method, applied to the band presence or absence data of 59 accessions, determined 65 most parsimonious trees. These trees contain consistent relationships among most of the Nepal and some of the Yunnan accessions; entire accessions are clearly divided into two geographical groups, and diploids and triploids tend to form separate groups in each geographical group. Triploid taros are believed to arise from diploids by fertilization of an unreduced gamete with a normal gamete. Unreduced gamete formation can occur repeatedly in any environment, but the triploid taros are generally found in marginal environments. Based on this evidence, it is concluded that geographical differentiation proceeded between Nepal and Yunnan, and triploids were formed and established as adapted plants in each area.
Van Du Nguyen Two new species of Arisaema from Vietnam (Buy)
 ABSTRACT: Two new species of Arisaema are described from Vietnam. One from north Vietnam named A. victoriae, the other from south Vietnam named A. condaoense. Both belong to section Fimbriata; A. victoriae is closely related to A. fimbriatum from the Malay Peninsular; A. condaoense is near to two species, A. kunstleri from Penisular Malaysia and A. pierreanum from southwest Vietnam.
Wilbert L. A. Hetterscheid, Van Du Nguyen Three new species of Typhonium (Araceae) from Vietnam (Buy)
 ABSTRACT: Three new species of Typhonium (T. bachmaense, T. lineare and T. penicillatum) are described from Vietnam.
Guy Gusman, Van Du Nguyen Two evergreen species of Arisaema (Araceae) from Vietnam (Buy)
 ABSTRACT: Botanical descriptions of Arisaema balansae Engl. and Arisaema petelotii K. Krause, two Vietnamese evergreen species, are provided with accompanying illustrations. Their taxonomy, distribution, habitat, and cultivation requirements are discussed. Some existing errors in their diagnoses are corrected.
Van Du Nguyen, Thomas B. Croat A new species of Hapaline (Araceae) from Vietnam (Buy)
 ABSTRACT: Hapaline loci, a species, new to the genus, is described from northwest Vietnam.
Guy Gusman, Van Du Nguyen, David Scherberich, Jin-Yin Tao Geographic distributions of Arisaema barbatum Buchet and Arisaema ramulosum Alderw. (Araceae) (Buy)
 ABSTRACT: We report here recent observations, made in the field, on the geographical distribution of two closely related Arisaema species, A. barbatum and A. ramulosum, both belonging to section Fimbriata. It is found that their respective areas of distribution are much wider than was previously noted, occurring in both the Indochinese and Malaysian phytogeographical regions.
Van Du Nguyen, Van Tien Tran, Cong Sy Le, Thi Van Anh Nguyen Rediscovery of Arisaema pierreanum Engl. after 145 Years, and its Current Status (Read)
 ABSTRACT: The genus Arisaema belongs to the Arum family – Araceae, which includes about 210 species Govaerts & Frodin, 2002 and is distributed from temperate to tropical areas, mainly in high mountain region. Since established by Martius in 1831, the genus Arisaema was studied by different authors such as Schott (1860), Engler (1920), D. Chatterjee (1955), Hara (1971), Li Heng (1979), Ohashi and Murata (1980), Murata (1984), V.D. Nguyen (1998, 2000, 2002, 2005, 2007). In Engler’s publication, many new species from different countries were described. Among them, Arisaema pierreanum was described based on the collection from Ba Den mountain (Tay Ninh province of Vietnam) made by L. Pierre in his journey in Indochina in 1869. Over 150 years passed without any collection of this species made from other places and with no information published on this species. This paper redescribes the species with more detailed morphological characters, discusses the status of the plant now, and provides images of living plants.
Van Du Nguyen, Hong Quang Bui, Van Tien Tran, T. Masuno, Peter Matthews Useful aroids and their prospects in Vietnam (Read)
 ABSTRACT: Although aroids are best known as food plants, a large majority of the wild and cultivated species in Vietnam have medicinal uses. Detailed studies of optimal growth conditions and effectiveness for medicinal use are needed for all of these plants. Ethnobotanical and practical studies also needed for sustainable management of wild aroid populations. This paper highlights the general scarcity of information on medically useful aroids.
Van Kien Nguyen, Thi Hanh Duong, Peter Matthews, Van Du Nguyen Aroids germplasm conserved at Plant Resources Center: Past-Present and Future (Read)
 ABSTRACT: Economic aroids are likely to have an increasingly important role in food security and agro-biodiversity. Vietnam is located within the Southeast Asian region that appears to be a cradle of origin for aroid crop species. Aroids have had long cultural and economic history among the diverse ethnic communities within Vietnam. There is not only a wealth of biological diversity among the economic aroids of Vietnam, but also a wealth of local knowledge concerning the planting, care, harvest, storage and use of aroids. The Plant Resources Center (former Plant Genetic Resources Center) is a focal point of the National Plant Genetic Resources conservation network in Vietnam and has conducted field surveys, collecting missions, and conservation efforts for economic aroids and related knowledge in Vietnam. We will introduce the previous history, study, and utilisation of aroid collections at the Plant Resources Center. The Center currently maintains 600 accession of Colocasia, 100 accessions of Xanthosoma, 16 accessions of Amorphophallus, 12 accessions of Alocasia and more than 32 unidentified accessions. We will also discuss aroid conservation strategies for Vietnam in the future.
Peter Matthews, Van Du Nguyen, Daniel Tandang, E. maribel Agoo, Domingo A. Madulid Taxonomy and ethnobotany of Colocasia esculenta and C. formosana (Araceae): implications for the evolution, natural range, and domestication of taro (Read)
 ABSTRACT: A critical problem for the taxonomy of taro (C. esculenta), and for understanding the evolution and domestication of this species, is that there is no way to recognise, by simple visual inspection, a wild population of taro as part of a natural distribution. This is because people throughout Southeast Asia have long used wild taro as a vegetable for human and animal consumption (as food and fodder). The example of C. formosana Hayata is introduced here because our observations so far indicate that this is a naturallydistributed wild species throughout its known range, despite its close phenotypic similarity to C. esculenta. To learn about the evolution, natural range, and domestication of taro, closer study of C. formosana is recommended.
Viet Xuan Nguyen, Thi Thanh Mai Dang, The Anh Ngo Genetic diversity and phylogenetic relationships among Colocasia species (Araceae) in Vietnam using SSR markers (Read)
 ABSTRACT: This study addresses the phylogenetic relationship between Colocasia species by microsatellite markers (SSRs). The plant materials of this study consisted of a total of 36 accessions belonging to C. esculenta, C. gigantea, C. lihengiae, C. menglaensis and two accessions of Alocasia odora (Roxb.) C. Koch. Seven SSR primer combinations produced a total of 97 alleles. The number of alleles per marker ranged from 6 to 18 alleles, with an average of 10.57 alleles per marker. The highest value of PIC found for SSRs was 0.93 and the lowest was 0.64, with a mean value of 0.77. A total of 68 polymorphic alleles with an average of 9.7 alleles per marker, and the highest value of PIC range from 0.8 to 0.6, with a mean value of 0.70 observed in the accessions of C. esculenta. Unweighted pair group method based on arithmetic average (UPGMA) analysis was performed on jaccard’s similarity coefficient matrix. According to the results, two main clusters were developed and C. esculenta, and C. gigantea located in the first main cluster (A). Three wild taro species localized in second main cluster (B). According to this study, the closest species to C. esculenta was C. gigantea. UPGMA analysis separated C. lihengiae and C. menglaensis from C. esculenta. This study revealed that C. lihengiae is similar to C. menglaensis, distinct from C. gigantea; and showed a closer genetic similarity to Alocasia odora than the C. esculenta.
Van Du Nguyen, T.C. Vu, Hong Quang Bui Arisaema lidaense J.Murata & S.K. Wu (Araceae): A New Record For The Flora Of Vietnam (Buy)
 ABSTRACT: Arisaema lidaense J.Murata & S.K. Wu, a species previously known from Yunnan (China), is recorded for the first time from Vietnam. This is the first time any species of Arisaema section Attenuata has been recorded from Vietnam. The species was found in Quan Ba district, Ha Giang province of Northern Vietnam. Vouchers are deposited in the Herbarium of the Institute of Ecology and Biological Resources (HN) Hanoi, Vietnam. In this paper, A. lidaense is described from the specimens collected from Vietnam.
Van Tien Tran, Van Du Nguyen, Cong Sy Nguyen Biological Characteristics and Distribution of the species Amorphophallus yuloensis H. Li (Araceae) in Vietnam (Buy)
 ABSTRACT: The paper includes information on the ecology and biology, distribution and content of glucomannan in tubers of the species Amorphophallus yuloensis H. Li in Vietnam. Amorphophallus yuloensis belongs to a group in the genus with short peduncles. It differs from other species in the group by having a much smaller inflorescence, stout conical appendix and violet blue berries. This is one of five species in Vietnam whose tubers contain high glucomannan content for the food industry. Glucomannan content in its tuber is about 29.2% of dried weight.