Trương Cường - Academia.edu (original) (raw)

Papers by Trương Cường

Journal of Essential Oil Bearing Plants, May 15, 2023

Murraya genus (family Rutaceae) has been widely used as local traditional medicines in East Asia.... more Murraya genus (family Rutaceae) has been widely used as local traditional medicines in East Asia. The chemical composition of essential oils extracted from six Murraya species and their repellent activity against Tribolium castaneum was investigated. From the samples of Murraya tetramera, Murraya euchrestifolia, Murraya koenigii, Murraya kwangsiensis, Murraya exotica, and Murraya alata, essential oils were obtained by hydrodistillation and their yields were various from 0.03 to 0.23%. All together 36 components were identified by GC-MS from the essential oils samples. The constituents with relatively higher contents included ␣-cedrene (4.22-21.82%), ␤-caryophyllene (8.15-27.73%), ␥-elemene (4.38-12.65%), ␥-selinene (3.80-21.09%), ␣-selinene (2.60-10.68%), ␣-zingiberene (2.08-12.68%), spathulenol (3.08-11.80%), caryophyllene oxide (1.58-10.59%), ␤-eudesmol (1.33-25.32%), etc. Moreover, eight compounds, which were recognized as significant components in the essential oils of M. tetramera, and M. kwangsiensis, were isolated and they were identified as ␣-terpinene, ␤-caryophyllene, ␣-caryophyllene, alloaromadendrene, spathulenol, ␤-eudesmol, camphene and caryophyllene oxide. The repellent activity against T. castaneum was tested for all the six samples of essential oils and eight isolated compounds. The testing samples exhibited a variety of repellent activity against T. castaneum. Among them, the essential oils of two species (M. tetramera and M. kwangsiensis) and three isolated compounds (alloaromadendrene, spathulenol and caryophyllene oxide) showed the fair repellent activity with relatively higher yields of contents. They might be considered as potential materials for the development of natural repellents for control of insects in stored products. Meanwhile, cluster analysis was performed using the collectives of data which were obtained in the process of the experiments. It was found that the characteristics of the repellent activity against T. castaneum could be related to the chemical composition of the essential oils. There were some interesting senses brought out as well. Such as, the repellent activity of the essential oils would not be depend on the contents of individual bioactive compound, and the existence of some compounds might affect the repellent activity of the essential oils.

Acta Phytotaxonomica et Geobotanica, Oct 31, 2020

Fifteen new species of angiosperms, Ilex bidoupensis, I. hongiaoensis (Aquifoliaceae), Mastixia h... more Fifteen new species of angiosperms, Ilex bidoupensis, I. hongiaoensis (Aquifoliaceae), Mastixia hongiaoensis (Cornaceae), Daphniphyllum hongiaoense (Daphniphyllaceae), Platea hongiaoensis (Icacinaceae), Neolitsea bidoupensis, N. hongiaoensis (Lauraceae), Nyssa bidoupensis, N. hongiaoensis (Nyssaceae), Eriobotrya hongiaoensis, Prunus hongiaoensis (Rosaceae), Luvunga hongiaoensis (Rutaceae), Illicium viridiflorum (Schisandraceae), Symplocos hongiaoensis (Symplocaceae) and Alpinia hongiaoensis (Zingiberaceae), from the Hon Giao area in Bidoup-Nui Ba National Park, Lam Dong Province, in the southern highlands of Vietnam, are described and illustrated.

Functional Ecology, Jun 3, 2021

1. Photosynthetic traits suggest that shade tolerance may explain the contrasting success of two ... more 1. Photosynthetic traits suggest that shade tolerance may explain the contrasting success of two conifer taxa, Podocarpaceae and Pinaceae, in tropical forests. Needle-leaved species from Pinus (Pinaceae) are generally absent from tropical forests, whereas Pinus krempfii, a flat-leaved pine, and numerous flat-leaved Podocarpaceae are abundant. Respiration (R) traits may provide additional insight into the drivers of the contrasting success of needle-and flat-leaved conifers in tropical forests. 2. We measured the short-term respiratory temperature (RT) response between 10 and 50°C and foliar morphological traits of three needle-and seven flat-leaved conifer species coexisting in a tropical montane forest in the Central Highlands of Vietnam containing notable conifer diversity. We fit a lognormal polynomial model to each RT curve and extracted the following three parameters: a (basal R), and b and c (together describing the shape of the response). 3. Needle-leaved species (Pinus kesiya, Pinus dalatensis and Dacrydium elatum) had higher rates of area-based R at 25°C (R 25-area) as well as higher area-based modelled basal respiration (a) than flat-leaved species (P. krempfii, Podocarpus neriifolius, Dacrycarpus imbricatus, Nageia nana, Taxus wallichiana, Keteeleria evelyniana and Fokienia hodginsii). No significant differences were found between needle-and flat-leaved species in mass-based R 25 (R 25-mass) or in the shape of the RT response (b and c); however, interspecific differences in R 25-mass , R at nighttime temperature extremes (R 4.1 and R 20.6) and leaf traits were apparent. 4. Differences in R 25-area and a suggest that needle-leaved foliage may be more energetically costly to maintain than flat-leaved foliage, providing new insight and additional support for the hypothesis that shade tolerance is an important driver of Podocarpaceae success and Pinaceae absence in the majority of tropical forests. 5. Interspecific differences in R 25-mass and leaf traits highlight that varying ecological strategies are employed by conifers to coexist and survive in the Central Highlands | 1409 Functional Ecology SCHMIEGE Et al.

Tạp chí Sinh học, Jul 23, 2019

Aglaonema costatum f. concolor is reported as a new record for the flora of Vietnam. The taxon wa... more Aglaonema costatum f. concolor is reported as a new record for the flora of Vietnam. The taxon was recently found in Phong Nha-Ke Bang National Park, Quang Binh Province. It is illustrated with detailed photographs of key morphological characters taken from the field. A key to all known taxa of Aglaonema in Vietnam is given.

Phytotaxa, Aug 25, 2022

Beilschmiedia bidoupensis (Lauraceae) is described from Bidoup-Nui Ba National Park in the southe... more Beilschmiedia bidoupensis (Lauraceae) is described from Bidoup-Nui Ba National Park in the southern highland of Vietnam. The new species is characterized by lanceolate terminal buds that are ca. 2.5 mm long without coriaceous scales and covered with whitish brown hairs, glabrous twigs, predominantly alternate leaves evenly arranged on branches, elliptic leaf blade with acuminate apex, and depressed globose to transversely ellipsoidal fruits with not verrucose but asperously furfuraceous surface. A description, illustrations, preliminary conservation assessment, and DNA barcodes of ITS, psbA-trnH and trnL regions, are provided.

Authorea (Authorea), Feb 11, 2023

The premise of the study Though phenological studies in montane forests are important, particular... more The premise of the study Though phenological studies in montane forests are important, particularly in tropical Asia where primitive angiosperms are found, the phenology in these forests is still poorly understood. To characterize the phenological patterns and reveal the relationships between meteorological factors and phenology, we observed the leafing, flowering, and fruiting phenology in the tropical montane forests of Vietnam. Methods We observed the leafing, flowering, and fruiting phenology of 91 species every three months in five plots (elev. 1460-1920 m) in Bidoup-Nui Ba National Park, Vietnam, and analyzed how the number of species that were leafing, flowering, or fruiting varied in relation to precipitation, temperature, or daylength. Key results The leafing phenology showed a peak at the beginning of the wet season (April) and was significantly influenced by all of day length, precipitation, and temperature. The flowering phenology did not show any distinct peaks and was influenced by day length and precipitation. The fruiting phenology showed a low peak from the wet season (July) to the beginning of the dry season (December) and was not significantly influenced by any of the meteorological factors. Main conclusion The community-wide phenological patterns of leafing, flowering, and fruiting in the tropical montane forest of Bidoup-Nui Ba are unique among the tropical forests of East and Southeast Asia. In particular, our observation suggests that masting in tropical montane forests may be an ancestral state of both general flowering in tropical rainforests and masting found in temperate forests in East and Southeast Asia.

Tree Physiology, 2020

The absence of pines from tropical forests is a puzzling biogeographical oddity potentially expla... more The absence of pines from tropical forests is a puzzling biogeographical oddity potentially explained by traits of shade intolerance. Pinus krempfii (Lecomte), a flat-leaved pine endemic to the Central Highlands of Vietnam, provides a notable exception as it seems to compete successfully with shade-tolerant tropical species. Here, we test the hypothesis that successful conifer performance at the juvenile stage depends on physiological traits of shade tolerance by comparing the physiological characteristics of P. krempfii to coexisting species from two taxa: the genus Pinus, and a relatively abundant and shade-tolerant conifer family found in pantropical forests, the Podocarpaceae. We examined leaf photosynthetic, respiratory and biochemical traits. Additionally, we compiled attainable maximum photosynthesis, maximum RuBP carboxylation (Vcmax) and maximum electron transport (Jmax) values for Pinus and Podocarpaceae species from the literature. In our literature compilation, P. krempf...

Phytotaxa, 2021

Camellia langbianensis is a species endemic to southern Vietnam. It was described by Gagnepain ba... more Camellia langbianensis is a species endemic to southern Vietnam. It was described by Gagnepain based on the collection of Poilane and was rediscovered about 80 years since published. The complete descriptions and illustrations are provided for this species. A comment on the affinities with closely related species C. vidalii is also shown. It is accessed to be Critically Endangered (CR) according to IUCN categories and criteria.