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Evaluation of genetic diversity and identification of Huperzia species collected in some different areas in Vietnam by molecular markers

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Ha T. T. T., Khanh T. D., Trung K. H.

International Letters of Natural Sciences

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2020

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tom 80

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Effect of salt on growth of rice landraces in Vietnam

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Anh L. H., Hue H. T., Quoc N. K., Nghia L. T., Trung K. H., Trung T. N., Trang D. H., Xuan T. D., Khanh T. D.

International Letters of Natural Sciences

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2016

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tom 59

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Evaluation of ursolic acid as the main component isolated from Catharanthus roseus against hyperglycemia

64%

Thanh Tam N., Thien D. D., Sung T. V., Thi Hoang Anh N., Thuy T. T., Trung K. H., Xuan T. D., Khanh T. D.

International Letters of Natural Sciences

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2016

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tom 50

Ursolic acid with large amount (0.67% of dried plant weight) along with 7 compounds, namely as spatozoate (1), kaurenoic acid (2), ursonic acid (3), 3-hydroxy-11-ursen-28,13-olide (4), ursolic acid (5), vindoline (6) and mixture of β-sitosterol and stigmasterol were isolated from dichloromethane and ethyl acetate extracts which have shown anti-glucosidase activity of the whole plant of C.roseus. Some isolated compounds and their derivatives were also tested for anti-glucosidase and cytotoxicity.Ursolic acid was examined for hypoglycemic activity in alloxan-induced diabetic mice with dose of 200 and 300 mg/kg/day, respectively. The results have shown that the blood glucose level were reduced by 45.75% and 51.31% to compare with the control group. This study has confirmed that the main component of Vietnamese C. roseus has had significant anti-hyperglycemia activity.

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Identification of candidate gene SalT and designing markers involving in salt tolerance of Vietnamese rice landraces

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Trung K. H., Khoa N. T., Diep N. T., Thuy T. T., Ha D. T. T., Cuong T. D., Xuan T. D., Trung D. M., Toan N. N., Quyen P. T., Linh L. H., Khanh T. D.

International Letters of Natural Sciences

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2017

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tom 63

Rice (Oryza sativa L.) is a principle crop as the main economic importance in Vietnam, providing daily food for over 90 million people in this country. However, a large rice growing areas and rice production are being seriously affected by salinity intrusion, the threats of devastation from climate change. The need to develop salinity tolerance rice varieties to cope with adverse climate change is very imperative. In this study, based on the genome sequence databases of 36 Vietnamese rice landraces, we have identified nine Vietnamese rice landraces carrying nine SalT candidate genes with the sequence similarity to O. sativa SalT (the published GenBank: Z25811.1) which have shown salinity tolerance are included: Te Nuong, Khau mac buoc, Chan thom, Khau giang, Tan ngan, Nang thom cho dao, OM5629, Hom rau and Thom Lai landraces). Amongst them, four rice landraces, Nang thom cho dao, OM5629, Hom rau and Thom lai have revealed two fragments of deletion with six and seven nucleotides which were the most identical to the SalT reference gene. Two primer pairs have been successfully designed to identify the SalT candidate genes in Vietnamese rice landraces. This study provides useful information of salinity tolerance of some Vietnamese rice landraces for breeding programs.

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Allelopathic activity of dehulled rice and its allelochemicals on weed germination

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Khang D. T., Anh L. H., Thu Ha P. T., Tuyen P. T., Quan N. V., Minh L. T., Quan N. T., Minh T. N., Xuan T. D., Khanh T. D., Trung K. H.

International Letters of Natural Sciences

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2016

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tom 58

In this study, the allelopathic potential of dehulled rice, rice, and hulls of rice on germination of weeds was evaluated in laboratory. Phenolic acids in growth media of these plants were also identified and quantified using HPLC. Identified allelochemicals were reversely tested for phytotoxic effects on germination and seedling growth of barnyardgrass, lettuce, radish and rice. The results showed that the inhibitory effects of dehulled rice were stronger than those of hulls and rice. Dehulled rice caused 66.7% and 50.6% reduction in radish root length and lettuce shoot height, respectively. Dehulled rice showed strong inhibitory effects on root length of lettuce and shoot height of radish while hulls and rice exhibited stimulation. Regarding phenolic identification, vanillin and vanillic acid were detected as allelochemicals in root exudates of rice and tested plants. The results revealed that most of the vanillin and vanillic acid treatments showed high inhibitory effects on germination rates and seedling growth of lettuce and radish, high stimulatory activity on root elongation of rice. Vanillic acid (100 ppm and 200 ppm), vanillin (100 ppm) and their mixture (200 ppm) completely inhibited survival of lettuce. The findings indicate the allelopathic potential of dehulled rice which can be used for identification of more phytotoxins to produce bioherbicides in agricultural practices.

Ograniczanie wyników

Evaluation of genetic diversity and identification of Huperzia species collected in some different areas in Vietnam by molecular markers

Effect of salt on growth of rice landraces in Vietnam

Evaluation of ursolic acid as the main component isolated from Catharanthus roseus against hyperglycemia

Identification of candidate gene SalT and designing markers involving in salt tolerance of Vietnamese rice landraces

Allelopathic activity of dehulled rice and its allelochemicals on weed germination