Melatonin involves hydrogen sulfide in the regulation of H+-ATPase activity, nitrogen metabolism, and ascorbate-glutathione system under chromium toxicity

Phytomelatonin: A key regulator of redox and phytohormones signaling against biotic/abiotic stresses

“…As a result of the MT treatment, the plants can effectively achieve a greater K + /Na + ratio, maintaining a higher level of antioxidant activity and reducing ROS generation [ 83 ]. Excess ROS were substantially scavenged by supplementing chromium-stressed tomato seedlings with MT, maintaining ROS homeostasis in the plants [ 84 ]. A significant increase in H 2 S was observed following the application of 30 mM MT to tomato seedlings under chromium stress.…”

“…A significant increase in H 2 S was observed following the application of 30 mM MT to tomato seedlings under chromium stress. In contrast, 1 mM hypotaurine (H 2 S scavenger) inhibited the effect of MT in reducing Cr-toxicity [ 84 ]. Consequently, it was concluded that MT requires intracellular H 2 S to ameliorate the negative effects of Cr on tomato seedlings.…”

Synergistic interplay between melatonin and hydrogen sulfide enhances cadmium-induced oxidative stress resistance in stock ( Matthiola incana L.)

“…Using beneficial biomolecules as crop protectant agents might allow the plants to better tolerate abiotic stress conditions. 11–13 Plant MLT is thought to be involved in regulating germination, photosynthesis, flowering, leaf senescence, root development, carbohydrate metabolism, and circadian rhythm as an antioxidant and growth regulator. 14 Recent research has demonstrated that MLT application on HMs stressed plants may eliminate excess ROS and thus provide relief from the HMs induced oxidative stress in plants that causes growth and yield restrictions (Chen et al 2023).…”

“… 14 Recent research has demonstrated that MLT application on HMs stressed plants may eliminate excess ROS and thus provide relief from the HMs induced oxidative stress in plants that causes growth and yield restrictions (Chen et al 2023). 11 …”

“… 18 Application of H 2 S is reported to improve the heavy metal tolerance in crop plants such as tomato 13 and tomato 19 etc. Notably, numerous studies have demonstrated that MLT can regulate plant growth and HMs stress responses through interactions with other signaling molecules such as H 2 S. 11 , 20 The interactive effects of MT and H 2 S were evaluated by Haghi et al 20 and found that MLT and H 2 S interaction provided relief from lead (Pb) induced oxidative stress in safflower plants by reducing the Pb uptake and regulating the ascorbate-glutathione cycle. 18 evaluated that H 2 S induces arsenic tolerance in pepper plants via regulating endogenous MLT level.…”