Phenotyping and metabolomics insights into the effect of melatonin in lettuce under non-stress and salinity conditions.

Melatonin (MLT) is an indole derivative that exhibits hormone-like activities in plants, regulating multiple aspects of growth and development. Due to its role in mitigating oxidative stress and facilitating osmoprotectant accumulation, MLT enhances abiotic stress tolerance, although the pathways and metabolic mechanisms involved remain unclear despite being studied in various crops. This work aimed to investigate the changes elicited by the exogenous MLT application at different concentrations (10, 50, 150 μM) and its role in mitigating the salinity stress in Lactuca sativa L.

Modulation of K translocation by AKT1 and AtHAK5 in Arabidopsis plants.

Root cells take up K from the soil solution, and a fraction of the absorbed K is translocated to the shoot after being loaded into xylem vessels. K uptake and translocation are spatially separated processes. K uptake occurs in the cortex and epidermis whereas K translocation starts at the stele.