沈阳农业大学学报2026，Vol.57Issue(4)：1-11,11.DOI:10.3969/j.issn.1000-1700.2026.04.001
外源褪黑素对盐胁迫下柳兰幼苗生长及生理特性的影响
Effects of Exogenous Melatonin on Growth and Physiological Characteristics of Chamerion angustifolium Seedlings under Salt Stress
摘要
Abstract
[Objective]Soil salinization is one of the major abiotic stress factors limiting the growth and development of landscape plants worldwide.Melatonin(MT),an indoleamine regulator widely presents in living organisms,has shown considerable potential for alleviating damage caused by drought,salinity,and extreme temperatures by enhancing intracellular antioxidant defense,scavenging excess reactive oxygen species,and maintaining ionic homeostasis.This study aimed to investigate the regulatory mechanisms of exogenous MT on the growth,development,and physiological homeostasis of Chamerion angustifolium seedlings under salt stress.[Methods]Wild Chamerion angustifolium seedlings from Xilingol(provenance A)and Hulunbuir(provenance B)were used in a pot experiment.Two NaCl concentrations(0 and 150 mmol·L-1)and three foliar MT concentrations(0,100,and 200 μmol·L-1)were applied to evaluate the effects of MT on seedling phenotypic and physiological traits.[Results]Exposure to 150 mmol·L-1 NaCl significantly inhibited the growth and photosynthetic carbon fixation efficiency of Chamerion angustifolium seedlings.Foliar application of 200 μmol·L-1 MT significantly alleviated salt-induced damage,and growth inhibition was mitigated in seedlings of both provenances.Exogenous MT enhanced enzymatic antioxidant defense in seedlings of both provenances by increasing the activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT),glutathione reductase(GR),ascorbate peroxidase(APX),and glutathione peroxidase(GPX),while reducing the accumulation of malondialdehyde(MDA)and total reactive oxygen species(T-ROS),thereby mitigating salt-induced oxidative damage.In addition,MT increased the activities of ribulose-1,5-bisphosphate carboxylase/oxygenase(Rubisco)and Rubisco activase(RCA),thereby promoting the recovery of photosynthetic carbon metabolism in Chamerion angustifolium seedlings under salt stress.[Conclusion]Exogenous MT significantly improved the salt tolerance of Chamerion angustifolium seedlings by alleviating salt-induced growth inhibition,improving photosynthetic carbon metabolism,and strengthening antioxidant defense capacity.关键词
柳兰/盐胁迫/褪黑素/光合系统/抗氧化防御Key words
Chamerion angustifolium/salt stress/melatonin/photosynthetic system/antioxidant defense分类
农业科技引用本文复制引用
宝秋利,刘越..外源褪黑素对盐胁迫下柳兰幼苗生长及生理特性的影响[J].沈阳农业大学学报,2026,57(4):1-11,11.基金项目
国家重点研发计划课题项目(2023YFF1304102) （2023YFF1304102）
国家自然科学基金项目(32160335) （32160335）
