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• Lead-Induced Oxidative Stress and Defense Responseof Soybean ‘DT84’

  Mai Van Chung, Tran Ngoc Toan

  Received: 14-01-2015 / Accepted: 22-07-2015

   Abstract PDF (VIETNAMESE)

  Oxidative stress in root of soybean [(Glycine max (L.) Merr.] cv. DT84’ was induced by exposure to Pb2+ ion. The reactive oxygen species (ROS) products such as hydrogen peroxide (H2O2), superoxide anion radical (O2.-) were rapidly produced 6-12 hours after treatment with Pb2+. The enhancement of the ROS was closely dependent upon concentrations of Pb2+. An increase in content of thiobarbituric acid reactive substances (TBARS) - product of membrane lipid peroxidation, and the high percentage of injury (13.89-25.03%) indicated that the cellular damage was resulted from oxidative stress. The induction of superoxide dismutase (SOD) and catalase (CAT) in roots of soybean cv. DT84 as the defense response of soybean via these antioxidative enzymes reduced the concentration H2O2 and O2.- 24 hours following Pb2+ treatment, therefore, contributing to control oxidative stress in soybean roots.

• Methods of Spawning Induction In Gastropoda -A Review

  Le Van Binh, Ngo Thi Thu Thao

  Received: 13-12-2021 / Accepted: 27-05-2022

   Abstract PDF (VIETNAMESE)

  The goal of this article was to summarize some of the mechanisms of spawning induction in gastropoda in the marine and freshwater environment. Nutritional and environmental factors (lighting, temperature, and the tidal cycle-for marine species) affected the changes of the endocrine system in gastropoda. The changes in environmental conditions also affected the change of reproductive structure. Illumination cycle, temperature, change of water source, and hydrogen-peroxide solution (H2O2) affected the central nervous system, stimulating the egg-laying process of most gastropoda. For marine gastropods, using H2O2solution and ultraviolet or heat shock all gave good spawning efficiency. However, other methods such as changing the water depth or combined with rain spraying, pituitary glandinjections, and tentacle cutting were more effective in spawning induction for freshwater gastropoda.

• Effect of Calcium and Salicylic Acid on Growth of Yardlong Bean under Salt Stress Condition

  Nguyen Thi Phuong Dung, Tran Anh Tuan

  Received: 20-02-2017 / Accepted: 19-06-2017

   Abstract PDF (VIETNAMESE)

  The aim of this study was to determine the effect of exogenous application of salicylic acid (SA 0.25 mM) and calcium nitrate (Ca(NO3)250 mM), singly or in combination, on plant growth, photosynthetic capacity, and some stress markers of yardlong bean plants exposed to salt stress (0.3% NaCl). Application of 0.3% NaCl reduced plant growth, total chlorophylland carotenoid content, and chlorophyll fluorescent (Fv/Fm). Exogenous application of SA or Ca2+alone alleviated the level of proline content, saturation of water shortage, hydrogen peroxide (H2O2), ion leakeageandmalondialdehyde (MDA) in the presence of NaCl. Nevertheless, the best results in growth of stemsand leaves, photosynthetic pigment concentrations, and some stress markers were observedin response to the combined SA + Ca2+treatment, except accumulation of dry matterand ion leakeage. Our results suggestedthat Ca2+and SA may interact to reduce the stress experienced by the plantsin the presence of NaCl.