Exogenous serotonin improves drought and salt tolerance in tomato seedlings

Serotonin and melatonin, which are indolamines present in every biological kingdom, show strong bioregulator activity plant tissues under various stress conditions. Although numerous studies have reported the mitigating effects of effect serotonin on physiology has rarely been studied current literature. In this study, exogenous application tomato seedlings severe salt drought stresses were investigated by examining morphological physiological indicators, including tissue length mass, relative water content (RWC), ion leakage, malonedialdehyde (MDA) proline content, as well some oxidative related gene activities, ascorbate peroxidase (APX1), superoxide dismutase (FeSOD), catalase (CAT2), glutathione reductase (GR1), delta 1-pyrroline-5-carboxylate synthase (P5CS) 1-aminocyclopropane-1-carboxylic acid 2 (ACS2). Our results showed that MDA contents decreased 29% 18%, leakage levels 39% 34%, whereas increased 22% respectively, upon application. also ACS2 expression 28% 70%, while increasing FeSOD 69 17%, CAT2 145 110% GR1 67 22%, stresses. Also, transcript level P5CS 48% coapplication. findings similar to its close chemical exhibits mitigation boosts antioxidant capacity plants most common abiotic