Physiology, APX expression and electrical signals in sorghum bicolor under salt stress

Plants have developed strategies and mechanisms for survival in the face of abiotic stimuli. Among them, acclimation mechanisms can be activated by local tissues that interact directly with the threat, passing on the information to the entire plant, resulting in a systemic response. The systemic response of the plant is known as systemic acquired acclimation (SAA) and can be observed through reactive oxygen species (ROS), calcium waves, and electrical signals, which act in signal transduction and are extremely important for inducing acclimation mechanisms. The objective of this study was to verify if recurrent and non-recurrent saline stress of 120 mM for 24 hours induces SAA in sorghum plants (Sorghum bicolor), in addition to measuring the difference in signaling using the split-root system, exposing only one side of the root to salinity. Data on electrophysiology, gas exchange, chlorophyll a fluorescence, lipid peroxidation, H2O2, activity of SOD, POD, proline enzymes and expression of APX1 and APX2 genes were collected and analyzed. The results of E, gs, A/E, A/gs, POD, SOD, APX1 and electrical in S-S indicate that priming occurred, increasing the sensitivity to saline stress, which may generate an acclimation process.