13 research outputs found
Magnesium deficiency decreases biomass water-use efficiency and increases leaf water-use efficiency and oxidative stress in barley plants
The comparision of the balance, breathing capacity and reaction time of the different impaired group of athletes
Magnesium balance in four permanent manurial experiments under rainfed agro-ecosystems of India
Magnesium applications to growth medium and foliage affect the starch distribution, increase the grain size and improve the seed germination in wheat
Morpho-anatomical changes and antioxidant enzyme activity during the acclimatization of Genipa americana
Production, physiology, and molecular characterization of sorghum (Sorghum bicolor (L.) Moench) genotypes under the interactions of abiotic stresses
The possible role of extra magnesium and nitrogen supply to alleviate stress caused by high irradiation and temperature in lemon trees
Magnesium isotope fractionation reflects plant response to magnesium deficiency in magnesium uptake and allocation: a greenhouse study with wheat
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