Abstract
Regulation of antioxidant activity in maize (Zeamays L.) by exogenous application of sulfur under saline conditions
Highlights
Salt stress greatly reduces agricultural productivity all over the world
Sulfur application ameliorated the adverse effects of salinity in both maize cultivars (Agatti 2003 and Pak Afgoi 2003), as seen from statistically significant salinity × sulfur (Sa × S) interactions in maize shoots (Table 2)
Sulfur application improved salt tolerance in both maize cultivars by improving ascorbic acid contents in maize plants (Table 2)
Summary
Salt stress greatly reduces agricultural productivity all over the world. It has been reported that salinity affected 20% of the total cultivated area and 30% of irrigated land (Machado and Serralheiro, 2017). Salinity causes disturbances in various metabolic activities in plant cells and creates oxidative stress. High accumulation of Na+ and Cl- ions in plant cells generates reactive oxygen species. In low concentrations reactive oxygen species play a key role in cell signaling and regulation of plant growth and development. In excess, reactive oxygen species cause oxidative stress. Various enzymatic (peroxidase, superoxide dismutase, catalase, and glutathione reductase) and nonenzymatic (tocopherols, phenolics, carotenoids, and lycopene) antioxidants are involved in balancing the production of reactive oxygen species through a scavenging and neutralizing mechanism (Kumari et al, 2014). An appropriate concentration of antioxidants is needed to cope with oxidative stress caused by salinity
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