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However, SL application increased drought tolerance in Brassica rapa by improving the antioxidant defense system that reduced ROS and MDA content ( Medicago truncatula roots, leading to a high expression of SL biosynthetic genes ( 9.2 Salicylic acid Salicylic acid (SA) is a powerful phytohormone that contributes to the production of ROS in excess (acting as a pro-oxidant) while also boosting the activity of ROS-scavenging enzymes (antioxidants) during stressful conditions ( 2 O 2 , which serves as a key signal to activate the antioxidant defense system, helping the plants to cope with abiotic stress

Low levels of H 2 O 2 can oxidize these residues, leading to their sulfenylation (S-OH), sulfenamidylation (S-N), glutathionylation (S-SG), or disulfide bond formation between protein cysteine residues (S-S)

Most glutathione is maintained as GSH in healthy humans and animals, with GSSG concentrations generally being low

Song, T., Chen, C., Liao, J., Ou, H

it functions as a direct free radical scavenger that can penetrate cellular compartments, including mitochondria and the nucleus, with remarkable ease