外源褪黑素缓解陆地棉幼苗盐碱胁迫的生理效应
曹艳 , 程艳荣 , 卫怡涵 , 黄焰新 , 闫旭宇
延安大学学报(自然科学版) ›› 2026, Vol. 45 ›› Issue (01) : 70 -75.
外源褪黑素缓解陆地棉幼苗盐碱胁迫的生理效应
Physiological effects of exogenous melatonin on alleviating saline-alkali stress in upland cotton seedlings
盐碱胁迫是影响作物生长发育的重要环境因素之一,探究外源褪黑素对不同程度盐碱胁迫下棉花幼苗的生理缓解效应。通过盆栽棉花幼苗实验法,测定了抗氧化酶活性、渗透调节物质含量及丙二醛含量等指标。结果表明,盐碱胁迫可诱导棉花幼苗抗氧化酶活性、渗透调节物质以及丙二醛含量升高,而外源褪黑素可以缓解盐碱胁迫对棉花幼苗的伤害,且缓解效果呈浓度依赖性。50 μmol·L⁻¹褪黑素使POD活性、可溶性糖及游离脯氨酸含量在轻度胁迫下分别下降40%、81%和65%;在中度胁迫下,150 μmol·L⁻¹褪黑素使POD活性、渗透调节物质及丙二醛含量分别下降46%、81%和41%;在重度胁迫下,200 μmol·L⁻¹褪黑素使各指标均分别降低51%、41%和62%。外源褪黑素处理盐碱胁迫时棉花幼苗表现出浓度依赖性和胁迫程度特异性,为后续深入研究棉花幼苗抵抗盐碱胁迫提供理论基础。
Saline-alkali stress represents a critical environmental constraint impacting crop growth and development. In order to explore the physiological ameliorative effect of exogenous melatonin on cotton seedlings under divergent intensities of saline-alkali stress, this experiment adopted the pot experiment to determine the antioxidant enzyme activities, osmolyte concentrations and malondialdehyde content of cotton seedlings. The results showed that salt-alkali stress triggered significant upregulation of antioxidant enzyme activities, accumulation of osmotic adjustment substances, and elevation of MDA content. Exogenous melatonin demonstrated consistent alleviatory effects against saline-alkali stress in a concentration-dependent manner. Under mild stress, 50 μmol·L-1 melatonin reduced the activities of POD, soluble sugar content and free proline content by 40%, 81% and 65%, respectively. Under moderate stress, 150 μmol·L-1 melatonin reduced POD activity, osmolyte levels, and MDA content by 46%, 41% and 80%, respectively. Under severe stress, 200 μmol·L-1 melatonin reduced each index by 51%, 41% and 62%, respectively. The exogenous melatonin of cotton seedlings, under saline-alkali stress showed concentration dependence and stress degree specificity, providing a theorectical basis for further in-depth research on the resistance of cotton seedlings to saline-alkali stress.
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国家自然科学基金项目(31960414)
国家自然科学基金项目(32260454)
延安大学产学研项目(CXY202112)
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