ROS Scavenging in Plants
Salinity is an issue impairing crop production across the globe. Under salinity stress, besides the osmotic stress and Na+ toxicity, ROS (reactive oxygen species) overaccumulation is a secondary stress which further impairs plant performance. Chloroplasts, mitochondria, the apoplast, and peroxisomes are the main ROS generation sites in salt-stressed plants.
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1. Enzymatic Scavenging System
(1) 2H2O → 4[e−] + 4H+ + O2 (The photolysis of H2O in PSII);
(2) 2O2 + 2[e−] → 2 O2− (Photoreduction of O2 in PSI);
(3) 2O2− + 2H+ → H2O2 + O2 (SOD catalyzes O2− disproportionation);
(4) H2O2 + 2AsA → 2H2O + 2MDA (APX catalyzes ASA reduction H2O2);
(5) 2MDA + 2[e−] + 2H+ → 2AsA.
Total: 2H2O + O2− → O2 + 2H2O.
2. Non-Enzymatic Scavenging System
This entry is adapted from 10.3390/su13063552