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(2009-09-02) Nguyễn, Ngọc Trân

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Transgenic soybean harboring Isopentenyl transferase 10 (GmIPT10) displays improved drought resilience

(2026-03) Hoang, Thi Xuan Lan; Nguyen, Phuong Thao

Soybean (Glycine max (L.) Merrill) is an important global source of plant-based oil and nutrition yet is highly sensitive to water deficit conditions, which significantly impair its growth, development and productivity. In this study, transgenic soybean lines carrying a soybean cytokinin metabolic gene Isopentenyl transferase (GmIPT10), which was previously identified as a drought-associated gene, were evaluated for their resilience under drought stress conditions. Following the water withholding treatments at the vegetative and early flowering stages, the transgenic plants exhibited reduced stress indicators compared with the control counterparts, including approximately 27−51 % lower malondialdehyde (MDA) levels and 33−55% less cellular ion leakage in the leaf tissues. Under the adverse conditions, RT-qPCR analysis revealed elevated expression levels of several drought-responsive marker genes (GmRD20A, GmERD1) and antioxidant-related genes (GmPOD, GmCAT, GmGST4) but more suppressed expression in the photosynthesis-negative regulator GmSGR1 in the transgenic plants. Additionally, the transformants maintained a higher proportion of mature pods containing two or three seeds, indicating enhanced yield potential under stress. Collectively, these findings suggest a better stress tolerance of IPT-transgenic soybeans, which is partially achieved by better plant protection from drought-induced damages, especially enhanced defense against oxidative stress, thereby supporting plant functions under water-limited conditions. This research highlights the biotechnological potential of the soybean GmIPT10 gene in enhancing soybean tolerance and its productivity under water stress conditions.

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Redescription with new molecular data of rare genus and species Iotonchulus longicaudatus Baqri, Baqri and Jairajpuri, 1978 (Mononchida, Iotonchidae) from Vietnam

(2026-03) Vu, Thi Thanh Tam; Le, Thi Mai Linh

The rare genus and species Iotonchulus longicaudatus (Baqri, Baqri & Jairajpuri, 1978) Andrássy, 1993b was previously found only in India. This species was first recorded in Vietnam at the Cat Tien National Park (Ho Chi Minh City) and is currently recorded in several natural areas: Phia Oac (Cao Bang), Van Ban (Lao Cai) and Con Dao Island (Ho Chi Minh City). The new illustrations with re-description and new molecular data were presented.

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High-density nursery of black tiger shrimp Penaeus monodon postlarvae and their performance in post-nursery phase

(2026-03) Hoang, Tung; Arnold, Stuart; Musson, Dean

This study evaluates the effects of nursery stocking density (600 and 1,100 PLs/m2) and nursery duration (3, 4 or 5 weeks) on the performance of black tiger shrimp Penaeus monodon postlarvae (PL18) during the nursery phase and the following 4-week post-nursery phase. Results show that survival was high, ranging from 85.1 to 89.6% across all the nursery treatments. Shrimp nursed at 1,100 PLs/m2 had a lower growth rate and smaller harvest weight, but better FCR and higher water usage efficiency (P < 0.05). Similarly, the longer nursery durations were associated with lower specific growth rate of shrimp but better FCR and higher water usage efficiency (P < 0.05). No interactions were found between the two studied factors, nursery density and duration (P > 0.05). Survival of shrimp in the post-nursery phase was significantly higher (P < 0.05) for shrimp that were nursed for 4 or 5 weeks (73.9 and 83.3%, respectively) compared to those nursed for 3 weeks (62.2%). Furthermore, the size variation of postlarvae that were nursed for 5 weeks was significantly smaller at the end of the post-nursery phase (P < 0.05). Overall, the study demonstrated that a combination of higher nursery densities (1,100 PLs/m2) and longer nursery durations (i.e. 5 or 4 weeks) maximized production of the nursery phase and shrimp survival in the post-nursery phase.

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Iron (II) and zinc (II) chelating abilities of peptides from spent brewer’s yeast

(2026-03) Ha, Thi Bich Ngoc; Dam, Thuy Hang; Tran, Thi Lan Phuong; Tran, Thi Hong Hanh; To, Kim Anh; Pham, Tuan Anh; Le, Tuan

Zinc and iron are essential microelements that contribute to a wide range of physiological functions in humans and animals. However, their inorganic forms often have low solubility and bioavailability and leading to zinc and iron deficiency. The alternative chelated forms of these essential metals offer a high absorption rate and bioavailability of these two metals in humans and animals. Spent brewer’s yeast is considered a low-cost by-product of the brewing industry that contains high concentrations of proteins and can be used to generate zinc and iron-peptide chelate as value-added products. The purpose of this study was to investigate the potential of chelating zinc and iron using peptides resulting from spent brewer’s yeast. Our results showed that protein concentration and degree of hydrolysis increased the zinc and iron chelating ability. The peptide fraction of less than 3 kDa demonstrated a maximum chelating yield exceeding 80% at pH 7. FTIR analysis revealed that the possible chelating site might be at the C=O of the carboxyl group and the C-N or N-H of amide-I and amide-II groups.

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A new species of sect. Alpinia subsect. Alpinia (Zingiberaceae) from Northern Vietnam

(2026-03) Nguyen, Phuong Hanh; Luu, Hong Truong; Nguyen, Quoc Binh; Tran, Duc Dung

Alpinia tamdaoensis was discovered on the southwestern slope of the Tam Dao mountain range. This area is mainly tropical moist evergreen forest, which covers most of TamDao at an altitude below 800m, subtropical moist evergreen low mountain forest covers the areas over 800 m. Because the survey route of many previous research teams often ignored this area, a survey on the mountain peaks and northeastern slopes of the Tam Dao mountain range. On the other hand, February to April each year is the flowering season of this species, this is the time when a few research teams survey. When the fruit is present, it is often confused with some other species of genus Alpinia in the same area and is therefore not collected. This find has increased the number of species of the genus Alpinia in Vietnam to 42 species. The new taxon is described and illustrated with field photographs of detailed botanical characteristics.

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