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Articles by Xuan Duong Vu
Total Records ( 3 ) for Xuan Duong Vu
  Thanh Loan Pham , Van Huy Nguyen , Thi Le Thu Hoang , Thi Tam Tien Ha , Chi Nghia Phan , Xuan Duong Vu and Thi Thu Tran
  Background and Objective: Rehmannia glutinosa Libosch. is a well-known medicinal plant species thanks to its valuable catalpol content with proven pharmacological potentials. However, there was little evidence on improving the crop productivity with a high catalpol content and total root yield. The present study aimed to assess the influence of nitrogen (N), phosphorus (P) and potassium (K) fertilizers on the catalpol content of Rehmannia glutinosa roots sown under divergent plant spacing. Materials and Methods: The experiment was designed with two factors: Factor A includes five incremental levels of fertilizers (0, 60, 120, 180 and 240 kg ha1 for N; 0, 40, 80, 120 and 160 kg ha1 for P and K) and factor B includes three plant spacings of S1 = 15, S2 = 20 and S3 = 30 cm between rows and 20 cm between plants. High Performance Liquid Chromatography (HPLC) was employed to determine the catalpol content. Results: The results showed that a moderate level of N (180 kg ha1) in combination with S3 might produce the highest root yield and catalpol content. Both P and K appeared better than N in catalyzing plants to gain higher yield and accumulate maximum catalpol content at the application rates of 120 kg ha1. Conclusion: The current study confirms the positive influence of N.P.K. and plant spacing on the total yield and catalpol content in roots of Chinese foxglove and practical information to promote the mass production for medicinal materials and pharmaceutical industries.
  Phi Bang Cao , Van Huy Nguyen , Thi Man Le , Thi Lan Huong Phung , Xuan Duong Vu and Thi Bich Ngoc Chu
  Background and Objective: Salicylic Acid (SA) is a plant hormone that plays a key role in regulating many physiological processes in plants, including seed germination, plant growth, photosynthetic efficiency, crop yield, flowering and senescence. This study aimed to investigate the physiological responses of Chrysanthemum variety “Mai Vang” to different concentrations of SA (0, 0.5, 1.0, 1.5 and 2.0 mM). Materials and Methods: The Chrysanthemum were treated by various concentrations of SA (0.5, 1.0, 1.5 and 2.0 mM), water treatment (SA0) was considered as control. The experiment conducted in a complete randomized design with a total of five treatments, each plot consisted of 15 plants. Duncan’s multiple range test was being used for statistical analysis at the 5% level of significance (p = 0.05). Results: The SA treatments affected the content of photosynthetic pigments, proline and malondialdehyde (MDA) in leaves as well as anthocyanin in florets. Generally, SA treatments at a concentration of 0.5 and 1.0 increased the content of chlorophylls and carotenoids while decreasing the content of MDA compared to water treatments. In contrast, SA1.5 and SA2.0 treatments decreased the content of these pigments while enhancing the accumulation of MDA compared to control. All SA treatments displayed higher content of proline in leaves than control. Also, plants treated by SA at 0.5 and 1.0 mM exhibited higher maximum quantum yield of photosystem II (Fv/Fm) value than untreated and 1.5 and 2.0 mM of SA treated ones. Conclusion: The present study provides further insight into the effectiveness of SA on the physiological characteristics of Chrysanthemum “Mai Vang”. Especially, SA at 1.0 mM had the maximum positive effect on the content of photosynthetic pigments, proline, anthocyanin and Fv/Fm index. Moreover, SA1.0 treatments exhibited a significant decrease in MDA content compared to control.
  Xuan Duong Vu , Chi Toan Le , Thi Bich Do , Phi Bang Cao , Quoc Binh Nguyen , Tien Chinh Vu , Trong Luong Dang , Van Du Nguyen and Bing Liu
  Background and Objective: Alpinia, the largest genus of Zingiberaceae, includes ca. 250 species. The A. coriandriodora D. Fang was recognized for Vietnamese flora. However, the systematic position of this species within Alpinia genus was unclear. The study aimed to understand the phylogenetic placement of A. coriandriodora based on the molecular data and interpret evolution of the key morphological characters. Materials and Methods: The phylogenetic analysis were conducted by using the combined dataset of two DNA regions by both Maximum Likelihood (ML) and Bayesian Inference (BI) methods. Seven morphological characters were selected for morphological character evolution and the analysis was performed in Mesquite. Results: Alpinia coriandriodora was supported closely related to southern Chinese species of Alpinia. Morphological character optimizations suggest that the presence/absence of tomentum in leaf, inflorescence rachis and ovary is an important character for the taxonomy of Alpinia. The character evolution analyses indicated that panicle is ancestral character in Alpinia. The A. coriandriodora shares different evolutionary histories based on our character re-construction to most members of Southeast Asian Alpinia. The presence of filament is supposed to be an adaptation to the pollination by insects for species of Alpinia. Conclusion: The present study revealed the molecular phylogenetic relationship of A. coriandriodora within Alpinia. The presence of filament could be an adaptation to the pollination by insects for species of Alpinia. Some reasonable conservation strategies are proposed to protect the species including maintenance of the plant’s natural habitats, seeds or seedlings collection for germplasm storage and artificial breeding using biotechnology.
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