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• Responses to Water Deficit of Mung Bean Cultivars at the Vegetative and Flowering Stages under Greenhouse Conditions

  Vu Thi Thuy Hang, Le Thi Tuyet Cham, Phan Thi Thu Hien, Pham Thi Ly

  Received: Aug 22, 2023 / Published: Dec 29, 2023

   Abstract PDF

  Mung bean (Vigna radiata L. Wilczek) is grown mainly under rainfed conditions, facing water deficits in different growth stages. This study was conducted to evaluate the responses of a local cultivar, Dau tam Thanh Hoa, and three introduced mung bean cultivars (DX14, Mongo Labo, and TV06425) to water stress at the different growth stages. The experiment was carried out in a greenhouse following a completely randomized arrangement with two replications. Drought was induced by withholding water at either the vegetative or flowering growth stages for 20 consecutive days. The control consisted of well-watered plants. After 8, 12, 15, and 20 days of drought, plant available water, growth characteristics, and the weights of fresh stems and roots were measured. After 20 days of drought, plants were watered to assess their recovery after 7 days and the growth characteristics, weights of fresh stems and roots, and yield components at the harvest stage were evaluated. The results showed that drought affected the growth, resilience, and yield-related factors more severely at the vegetative stage than at the flowering stage. The longer drought was imposed, the greater decline in plant growth was observed. Despite the recovery, fresh root mass and root length were still 40-50% and 10-30% worse than the control, respectively. Based on the growth responses and individual yields, Dau tam Thanh Hoa and DX14 were more tolerant to water deficit and can be used as materials for improving the drought tolerance of mung bean.

• Evaluation of Biological Characteristics and the Effects of Consortia of Drought-tolerant Bacteria on the Growth of Mung Bean under Water-deficit Conditions

  Nguyen Thanh Huyen, Le Thi Tra My, Nguyen Vu Phuong Thao, Dang Thi Thanh Tam

  Received: Jul 07, 2026 / Accepted: Sep 30, 2026 / Published: Oct 31, 2026

   Abstract PDF

  Mung bean (Vigna radiata L.) is a nutritious legume crop with significant economic value, especially in Asia. However, mung bean production can be severely affected by drought. The use of beneficial bacterial inoculants that stimulate plant growth under water-deficit conditions is a sustainable strategy for alleviating drought stress in plants. We investigated the biological characteristics and effects of drought-tolerant bacterial strain consortia on mung bean under drought conditions. Initially, three drought-tolerant bacteria, Serratia sp. L5, Bacillus sp. NG1, and Pseudomonas sp. SN1, were evaluated for their tolerance to heat, salinity, and different pH conditions. Additionally, the effects of individual and consortium inoculations on mung bean under drought conditions were evaluated through pot experiments. All three strains showed visible growth at temperatures ranging from 30 to 45°C and across a pH range of 6.0-10.0. They also maintained growth at NaCl concentrations of 3-7%, although biomass decreased to 42-67% of the control at 7% NaCl. Under water-deficit conditions, bacterial inoculation significantly promoted mung bean growth compared with the uninoculated control. Among the treatments, Serratia sp. L5, the Bacillus sp. NG1 + Pseudomonas sp. SN1 combination, and the three-strain consortium significantly improved fresh biomass, plant height, and number of leaves, with the three-strain consortium increasing fresh biomass by 67.7% compared with the control. These results indicate that the three abiotic stress-tolerant bacterial strains are promising candidates for formulation into plant growth-promoting bacterial consortia to support mung bean growth under drought conditions.

• Effects of Nitrogen Forms on Root System Development, Physiological Traits, and Dry Matter Production of Rice

  Thiem Thi Tran, Yamauchi Akira

  Received: Aug 20, 2018 / Accepted: Aug 20, 2018 / Published: Aug 20, 2018

   Abstract PDF

  The objectives of this study were to evaluate the effects of nitrogen forms on root system development (expressed as total root length, nodal root number, nodal root length, and lateral root length), water use, photosynthetic rate, and dry matter production under water deficit (WD) at 20% w/w and continuously waterlogged (CWL) conditions. Rice plants cv. Nipponbare were grown in plastic pots in a vinyl house. Six N forms were applied at the same rate of 360 mg N per pot, and were prepared as follows: N-NH4+ alone (A); N-NH4+ with nitrification inhibitor (A+DCD); N-NO3- alone (N); N-NO3- with nitrification inhibitor (N+DCD); combined N-NH4+ and N-NO3- (AN); and combined N-NH4+ and N-NO3- with nitrification inhibitor (AN+DCD). The nitrification inhibitor, dicyandiamide (DCD) (C2H4N4), was applied at the rate of 100 mg pot-1. The results of the experiment showed that under both WD and CWL conditions, significant increases were seen in the root system development as expressed through total root length, nodal root number, nodal root length, and lateral root length in the N-NO3- treatments with and without DCD compared to the application of N-NH4+ treatments with and without DCD. This led to an increase in water use, and eventually a significant increase in dry matter production. Similarly, the A treatments with and without DCD also significantly increased root system development as compared with the AN and AN+DCD treatments. Furthermore, under both CWL and WD conditions, the positive and notably significant correlations between the total root length and water use, as well as between the total root length and shoot dry weight, were found only in the A and A+DCD treatments. These results indicate that rice prefers sole ammonium over the mixed ammonium-nitrate treatment, and sole nitrate applications under both WD and CWL conditions.