外源褪黑素对铬胁迫下小麦幼苗生长和生理特性的影响

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中图分类号：S512.1 文献标识码：A 文章编号：1674-0033(2025)06-0001-06

Effects of Exogenous Melatonin on Growth and Physiological Characteristics of Wheat Seedlings Under Chromium Stress

WU Xiu-ning, HOU Jun-ying, XU Wei-ye (College of Biopharmaceutical and Food Engineering,Shangluo University,Shangluo 726oo,Shaanxi)

Abstract: To elucidate the mechanism by which exogenous melatonin modulates the growth and physiological characteristics of wheat seedlings under chromium stress,a hydroponic experiment was conducted using two wheat cultivars,Shangmai 5226and Xiaoyan15.Thestudyaimed toinvestigate theefectsof different exogenous melatonin concentrations (0,50,100 ,and 1 00O μmol/L) under varying Cr stress conditions ( 100μmol/L and 160μmol/l ). The results showed that under both 100μmol/L and 160μmol/L chromium stress, the seeding length,root length,soluble sugar content,andproline contentof the seedlings increased initiallyand then decreased with rising melatonin concentrations,while the MDA content declined.Overall,the effct of melatonin is characterized by "low promotion and high inhibition".Exogenous melatonin at 5 can effectively alleviate the Cr stress of 100μmol/L and 160μmol/L on the seedlings of Shangmai 5226 and Xiaoyan15.The finding of this study are expected to provide theoretical references for the prevention and control of chromium pollution in farmland and the cultivation of wheat under stress conditions.

Keywords:chromium stress; melatonin;wheat seedlings

干随现代工亚土）规筷时持续张与衣业集约化程度的不断提升，土壤环境中重金属的累积效应日益凸显[-。（剩余10901字）