Effects of Salinity Stress on the Growth, Physiology, and Yield of Soybean (Glycine max (L.) Merrill)

Abstract

This study was conducted to evaluate the salt tolerance ability of two soybean cultivars under salinity conditions using a selection of growth and physiological parameters. Three weeks after germination, plants began being treated with either a 100 mM concentration of NaCl in Hoagland solution or a non-salinity (0 mM NaCl) solution. The results showed that the plant height, number of leaves, leaf area index, and shoot and root biomasses were significantly reduced under salt conditions. A similar tendency was observed in several physiological parameters (SPAD, Fv/Fm). Since all the salt-treated plants of the D8 cultivar were dead after 40 days under the 100 mM NaCl treatment, the yield of D8 could not be obtained, while the treated plants of the D140 cultivar experienced a marked decrease in yield compared to the control plants. In this study, we identified that the D140 soybean cultivar had a better salt tolerance than the D8 soybean cultivar at a 100 mM NaCl concentration.

تأثير حامض الهيوميك والسايتوكينين والأرجينين على صفات النمو وحاصل نبات الفاصوليا Phaseolus vulgaris L تحت الإجهاد الملحي

“…Amino acids can be used as neutralizing compounds against stress conditions, and as a useful strategy to mitigate salt stress, as the foliar spraying of arginine leads to protective effects on plants in alleviating salinity stress by both improving vegetative growth qualities, and improving the enzymatic activities of antioxidant enzymes.s Catalase, Peroxidase, Superoxide Dismutase, and Ascorbate Peroxidase 59,60 , and the increase in phenolic substances and osmotic modification, which lead to a better antioxidant defense system for the plant and osmolytes accumulation 44,61 . When using arginine, the pigments of photosynthesis increased significantly in plants treated with arginine under salinity stress, and thus the efficiency of the photosynthesis process increased, as a result, carbohydrates accumulated, which formed the basic framework for the plants 62,63 .…”

Evaluating salt tolerance in soybean core collection: germination response under salinity stress

“…The results revealed a reduction in germination percentage with increasing salinity levels, with Lee being the most tolerant and Clark 63 the most susceptible cultivar. Similarly, research on D8 and D140 cultivars indicated a reduction in plant height, number of leaves, leaf area index, and shoot and root biomass after 100 millimolar (mM) NaCl treatment, identifying D140 as having better salt tolerance at 100 mM NaCl concentration (Linh et al 2021). Many of the earlier research studies have examined the salinity tolerance of soybean genotypes during the germination stage.…”