外源褪黑素对盐胁迫下小麦幼苗生理特性的影响

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中图分类号：S512 文献标识码：A 文章编号：0488-5368（2025）09-0008-06

Abstract：To clarify the physiological effects melatonin at optimal concentrations on enhancing salt tolerance in wheat seedlings，the wheat cultivars‘Shangmai 5226’‘Shangmai 1619’were used as experimental materials. Treatments included a control（CK），25O mmol/L NaCl solution（S），S + 25 μ mol/L melatonin （25MT），S + 50 μmol/L melatonin （50MT），S + 100 μmol/L melatonin（100MT），S + 200 μ mol/L melatonin（200MT）， ΔS+400μmol/L melatonin （4OoMT）. The effects melatonin on growth physiological characteristics were evaluated under salt stress.The results showed that all melatonin treatments （25～ 400μmol/L ） improved the growth physiological characteristics wheat seedlings under salt stress to varying degrees.The 2OOMTtreatment significantly increased plant height，root length，dry weight，fresh weight， root-to-shoot ratio，as wellas chlorophyll content，soluble sugar content，peroxidase （POD）activity， superoxide dismutase （SOD） activity，while significantly reducing malondialdehyde（MDA） proline content in both cultivars. These findings indicate that 200 μmol/L melatonin effectively alleviates the adverse effects salt stress represents an optimal concentration for promoting wheat seedling growth under such conditions.

Key Words： Salt stress；Wheat seedlings；Melatonin； Growth indexes；Physiological indexes小麦与稻谷和玉米共同构成了世界三大主要 谷物。（剩余8610字）