ArticleBMC plant biology2026
Exogenous melatonin enhances salt tolerance in Pyrus calleryana through coordinated regulation of osmotic adjustment and antioxidant defense.
Article in BMC plant biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSalt stress disrupts cellular water status, redox homeostasis, and ionic balance, thereby limiting the growth and ornamental performance of Pyrus calleryana. This study investigated the physiological mechanisms underlying melatonin-mediated salt tolerance.
resultsSeedlings subjected to 0.45% NaCl were foliar-sprayed with 50-200 µmol·L⁻¹ melatonin. Salt stress inhibited growth, enhanced membrane lipid peroxidation, reduced relative water content and photosynthetic capacity, and disturbed K⁺/Na⁺ ratio homeostasis. Melatonin application alleviated these adverse effects, with 100 µmol·L⁻¹ showing the strongest effect. Melatonin treatment increased proline and soluble protein levels, enhanced SOD, POD, and CAT activities, reduced MDA content and REC, and improved chlorophyll fluorescence and gas exchange parameters.
conclusionsComprehensive analysis revealed that the enhanced salt tolerance was associated with coordinated regulation between osmotic adjustment and antioxidant defense systems, which collectively stabilized membrane integrity, maintained cellular water status, and supported photosynthetic performance under salt stress.
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