Effect of Salinity Stress on Growth and Yield of Major Cereal Crops
Dr. Shikha Sharma*🟢, Dr. Amit Patel🟢
Dr. Shikha Sharma: Indian Agricultural Research Institute, Department of Agronomy (India)
Dr. Amit Patel: Indian Agricultural Research Institute, Division of Soil Science (India)
Abstract
Salinity is one of the most critical environmental constraints limiting agricultural productivity worldwide. This review evaluates the physiological and biochemical responses of major cereal crops (rice, wheat, and maize) to salinity stress. We analyze the mechanisms of osmotic tolerance and ion exclusion, and summarize breeding and genetic approaches to enhance salinity tolerance. Recent trials demonstrate that combined application of biochar and plant growth-promoting rhizobacteria (PGPR) can mitigate yield losses by up to 24% under moderate salinity conditions (8 dS/m). We recommend integrated soil-crop management practices for sustainable cultivation in salt-affected areas.
Full Text
Introduction
Soil salinity affects over 20% of irrigated agricultural land worldwide, posing a major threat to global food security. Cereal crops, which form the staple diet of the majority of the human population, are particularly sensitive to elevated salt levels during their early vegetative and reproductive stages.
Physiological Responses
Elevated levels of sodium (Na+) and chloride (Cl-) in the soil solution limit root water uptake, inducing osmotic stress. Over time, accumulation of Na+ in leaves triggers ion toxicity, inhibiting photosynthesis and enzyme activities. Plants employ various mechanisms, including sodium exclusion at the root level and vacuolar sequestration, to survive these conditions.
Mitigation Strategies
Integrated management combining salt-tolerant crop cultivars with soil amendments has shown promising results. In trials conducted over the past 12 months, the application of organic biochar significantly improved soil structure and water-holding capacity, reducing Na+ uptake in cereal crops.
Conclusion
Enhancing salinity tolerance in staple cereals is crucial for sustaining global agricultural output. Collaborative efforts combining marker-assisted selection, CRISPR gene editing, and microbiological soil inoculants represent the most viable pathway forward for reclamation of saline farmlands.