15 research outputs found
Avaliação agronômica da rebrota, dinâmica de decomposição e liberação de nutrientes de flemingia (Flemingia macrophylla (Willd.) Kuntze ex Merr.)
Physiological Responses of Indica Rice Varieties to Increased Atmospheric CO<sub>2</sub> and Temperature
Elevated CO2 Affects the Soil Organic Carbon Fractions and Their Relation to Soil Microbial Properties in the Rhizosphere of Robinia pseudoacacia L. Seedlings in Cd-Contaminated Soils
Climate, Climate Risk, and Food Security in Sri Lanka: Need for Strengthening Adaptation Strategies
What is good about Sri Lankan homegardens with regards to food security? A synthesis of the current scientific knowledge of a multifunctional land-use system
Crop water productivity and economic evaluation of drip-irrigated soybeans (Glyxine max L. Merr.)
Habitat management as a safe and effective approach for improving yield and quality of tea (Camellia sinensis) leaves
Root foraging and yield components underlying limited effects of Partial Root-zone Drying on oilseed rape, a crop with an indeterminate growth habit
Contains fulltext :
75952.pdf (publisher's version ) (Closed access)14 p
Elevated carbon dioxide and temperature effects on rice yield, leaf greenness, and phenological stages duration
Adequate magnesium nutrition mitigates adverse effects of heat stress on maize and wheat
Aims Heat stress is a growing concern in crop production because of global warming. In many cropping systems heat stress often occurs simultaneously with other environmental stress factors such as mineral nutrient deficiencies. This study aimed to investigate the role of adequate magnesium (Mg) nutrition in mitigating the detrimental effects of heat stress on wheat (Triticum aestivum) and maize (Zea mays).
Methods Wheat and maize plants were grown in solution culture with low or adequate Mg supply at 25/22 degrees C (light/dark). Half of the plants were, then, exposed to heat stress at 35/28 degrees C (light/dark). Development of leaf chlorosis and changes in root and shoot growth, chlorophyll and Mg concentrations as well as the activities of major antioxidative enzymes were quantified in the experimental plants. Additionally, maize plants were analyzed for the specific weights (e. g., dry or fresh weight per a given leaf surface area) and soluble carbohydrate concentrations of sink and source leaves.
Results Visual leaf symptoms of Mg deficiency were aggravated in wheat and maize when exposed to heat stress. In both species, root growth was more sensitive to Mg deficiency than shoot growth, and the shoot-to-root ratios peaked when heat stress was combined with Mg deficiency. Magnesium deficiency markedly reduced soluble carbohydrate concentrations in young leaf; but resulted in substantial increase in source leaves. Magnesium deficiency also increased activities of antioxidative enzymes, especially when combined with heat stress. The highest activities of superoxide dismutase (up to 80 % above the control), glutathione reductase (up to 250 % above the control) and ascorbate peroxidase (up to 300 % above the control) were measured when Mg-deficient plants were subjected to heat, indicating stimulated formation of reactive oxygen species (ROS) in Mg deficient leaves under heat stress.
Conclusions Magnesium deficiency increases susceptibility of wheat and maize plants to heat stress, probably by increasing oxidative cellular damage caused by ROS. Ensuring a sufficiently high Mg supply for crop plants through Mg fertilization is a critical factor for minimizing heat-related losses in crop production