Abstract
An aggravated salt concentration in soil restricts to intensify the crop productivity. In a salinity tolerance test, five Allium sativum cultivars viz. BARI Rashun-1, BARI Rashun-2, BARI Rashun-3, BARI Rashun-4 and Local (Natore local) were comapared subjecting four level of salt stress viz. 0, 4, 8 and 12 dS m-1. Total dry matter (TDM) (g) plant-1, bulb yield and yield supporting traits of all cultivars were depressed with successively induced salt. But, TDM productions, yield and yield supporting traits were less degraded in BARI Rashun-4 and BARI Rashun-3 at 12 dSm-1 salinity and had a stronger ability to continue constant osmotic potential maintaining the uttermost K+/Na+ ratio. The variety BARI Rashun-4 showed higher activity of antioxidant enzyme and less cell membrane damage at 12 dSm-1 salt level. BARI Rashun-3 and BARI Rashun-4 were considered as a relatively saline tolerant due to higher antioxidant enzyme synthesis, ion homeostasis and less degradation of yield. SAARC J. Agric., 19(2): 181-193 (2021)
Highlights
Salinity stress is a major inanimate problem that harms the agriculture by deteriorating the productive capacity all over the earth (Arif et al, 2020)
At 85 DAP (7.33 g plant-1, 90 DAP (7.56 g plant-1) and at harvest (9.40 g plant-1) significantly maximum Total dry matter (TDM) was produced by the variety BARI Rashun-4 under control condition
TDM of the BARI Rashun-2, BARI Rashun-3 and BARI Rashun-4 was reduced by 43.7, 28.8and 19.5%, respectively at harvest under 12 dSm-1 salinity compared to 8 dSm-1
Summary
Salinity stress is a major inanimate problem that harms the agriculture by deteriorating the productive capacity all over the earth (Arif et al, 2020). Global annual cost would be 27.3 billion US$ due to hamper of crop manufacture in salt induce soil (Qadir et al, 2014). Detrimental influence on crop intensification and productivity, which is interconnected to metabolic and physiological activities. Osmotic stress arises in high salt concentration areas due to Na+ and Cl- absorption, which lowers the osmotic potential and inhibits water flow (Hamouda et al, 2016) and thereby causes dehydration that accelarates the osmotic effect to the internal tissue and ions concentration. Plant physiological changes as a result of salinity, including the changes in photosynthetic pigment accumulation, diffusion rate, leaf water potential ability, K+, Ca2+ and Mg2+ content (Ferdous et al, 2018) and causes a chain of responses like the stomatal closure and a restricted CO2 fixation (Hirdi et al, 2016)
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