“…Thus, they work together to Abbreviations: APX, ascorbate peroxidase; AsA, ascorbate; CAT, catalase; ETR, electron transport rate; Fv/Fm, the maximal photochemical capacity of PSII; H 2 O 2 , hydrogen peroxide; MDA, malondialdehyde; NADPH, nicotinamide adenine dinucleotide phosphate; O 2 , superoxide anion; PAL, phenylalanine ammonia-lyase; Pn, Photosynthetic rate; PSI, photosystem I; PSII, photosystem II; ROS, reactive oxygen species; SOD, superoxide dismutase; DMR/MR 0 , the maximal photochemical capacity of PSI.limit the generation of hydroxyl radical by controlling the levels of O 2 À and H 2 O 2 . Under saline stress, plant antioxidant system is often stimulated to defense oxidative injury, and antioxidant capacity has been used as a criterion for the comparison of salt tolerance among crop cultivars (Ashrafi et al, 2015;Kiani-Pouya, 2015;Zhang et al, 2014). Phenolic compounds which are secondary metabolites have high ROS scavenging capacity, and accumulation of phenolics is commonly considered as a positive self-protection way to strengthen ROS scavenging ability in plants upon salt-induced oxidative stress (Abrol et al, 2012;Colla et al, 2013;Falleh et al, 2012;Ksouri et al, 2007;Shao et al, 2015;Zhao et al, 2015).…”