Exogenous Salicylic acid Ameliorates the Adverse Effects of Salt Stress on Antioxidant System in Rosmarinus officinalis L.

Abstract

S ALT stress is a main factor limiting plant growth and productivity. Salicylic acid (SA) has been shown to alleviate the adverse effects of different environmental stresses on plants. To investigate the protective role of salicylic acid (SA) in alleviating salt stress on Rosmarinus officinalis L. (rosemary) plant, a pot experiment was conducted to measure the growth parameters such as plant height and branch number. An antioxidant defense system, represented by catalase (CAT), superoxide dismutase (SOD) and peroxidase (POX), was evaluated at both biochemical and transcriptional levels. NaCl was applied at 0, 25, 50 and 100mM and 0, 0.2 and 0.4mM of SA were used. The exposure of rosemary plant to salt conditions resulted in significant reduction of plant height, branches number and increases in the three measured antioxidant enzyme activities, compared to control. The foliar application of SA effectively increased growth rates and enhanced the activities of CAT, SOD and POX enzymes. The PCR (RT-PCR) analysis revealed that the relative transcript levels of SOD, CAT, and POX genes were changed and up-regulated compared to the control due to NaCl stress and SA treatments, reached the highest expression level by applying 25mM NaCl and 0 SA treatments. The results implied that SA regulated the transcript levels of the antioxidant genes, resulting in the increased contents of antioxidant enzymes and enhanced salt tolerance.

Role of Zinc Oxide Nanoparticles in Ameliorating Salt Tolerance in Soybean

“…In this study, ZnO nanoparticles induced changes of the isoenzyme patterns of SOD, CAT and POX, especially in the salinity-stressed seedlings, which agrees with the finding of Abdelhamid et al (2019) and Morsi et al (2018). Therefore, it is suggested that the isozymes of SOD, CAT and POX present in soybean cells growing in the presence of 50mg/L of ZnO are required to remove ROS under unstressed condition.…”

Plant Growth Regulators Application Enhance Tolerance to Salinity and Benefit the Halophyte Plantago coronopus in Saline Agriculture

“…The benefits that PGRs application have on growth and abiotic stress are well known [ 42 , 43 , 44 ]. Under saline conditions, PGRs alleviate the adverse effects of salt on morphological, physiological, biochemical characteristics, and on crop yields and quality [ 10 , 29 , 45 ].…”

Exogenously-applied Salicylic Acid and Ascorbic Acid Modulate some Physiological Traits and Antioxidative Defense System in Zea mays L. Seedlings under Drought Stress

“…As a powerful signaling molecule in plants, salicylic acid (SA) is involved in protection mechanisms through modifiable physiological and biochemical functions and has varied effects on tolerance of abiotic and biotic stresses elements (Gunes et al, 2007;Nazar et al, 2011;Kang et al, 2013;Mahmoud, 2017;Morsi et al, 2018). The application of exogenous SA enhanced the growth and photosynthetic speed of crops under water stress (Hussein et al, 2007;Loutfy et al, 2012) and increased stomatal conductance and photosynthetic activity under drought stress (Habibi, 2012).…”