Melatonin Mediates the Regulation of Morphological and Anatomical Traits in Carex leucochlora under Continuous Salt Stress

Soil salinity is one of the most critical factors limiting plant growth and development. Carex leucochlora an important turfgrass species with a wide distribution in northern China that highly sensitive to salt stress, which impairs its Recently, melatonin has emerged as nontoxic biomolecule regulates enhances tolerance plants. In this study, mechanism melatonin’s regulation anatomical characteristics C. seedlings under continuous stress was explored. Our results indicated strongly suppressed leaf cell activity, inhibited root morphology negatively affected anatomic structures seedlings. Conversely, (150 μmol L−1) pretreatment improved detrimental effect by restoring leaf, alleviating damage membrane, improving altering architecture attributes. Moreover, after 12 days observations showed thickness blade, vascular bundle area main vein, vesicular area, upper epidermis, lower epidermis were increased 30.55, 15.63, 12.60, 16.76 27.53%, respectively, salinity. Melatonin treatment also increase 5.91, 7.59, 15.57, 20.51% epidermal thickness, cylinder diameter, xylem vessel pith compared days. These suggest alleviated through augmenting seedling growth, characteristics, maintained stability traits maintain chloroplast homeostasis, protected tissues promote radial transport water ions modifications induced exogenous application may help acclimate successfully saline soils.