山东农业科学2025，Vol.57Issue(9)：64-71,8.DOI:10.14083/j.issn.1001-4942.2025.09.007
外源褪黑素对不同生育时期低温处理水稻光合特性、抗氧化系统及产量的影响
Effects of Exogenous Melatonin on Photosynthetic Characteristics,Antioxidant System and Yield of Rice under Low Temperature Stress in Different Periods
摘要
Abstract
In order to explore the mitigation effect of exogenous melatonin treatment on low temperature stress in rice in different breeding periods,this potted planting experiments was carried out in 2023 by setting three treatments of outdoor normal growth(CK),low temperature stress(LT),and low temperature stress af-ter spraying melatonin(MT),and the effects of low temperature treatment after spraying exogenous melatonin at tillering stage(TS),ear pregnancy stage(BS)and grouting stage(FS)on rice photosynthetic characters,antioxidant system and yield were studied.The results showed that compared with LT treatment,MT treatment significantly improved the dry weight of leaves,stem and sheath in TS and BS periods,and the net photosyn-thetic rate(Pn),stomatal conductivity(Gs)and intercellular CO2 concentration(Ci)of rice leaves in TS,BS and FS periods.Compared with LT treatment,MT treatment significantly increased the activity of superox-ide dismutase(SOD)of rice leaves in the three growth periods by 22.90%to 33.18%,increased the peroxi-dase(POD)activity significantly by 8.47%to 17.38%,and improved the catalase(CAT)activity significant-ly by 5.49%to 13.14%.Compared with LT treatment,MT treatment significantly increased the content of sol-uble sugar,soluble protein and proline in rice leaves in the three growth periods,and the content of malondi-aldehyde(MDA)was significantly reduced by 13.73%,10.66%and 18.71%.The actual output of MT treat-ment during different growth period significantly increased by 17.79%,22.10%and 27.93%respectively com-pared with LT treatment.In conclusion,spraying exogenous melatonin could reduce the oxidative damage of low temperature stress to rice leaves,stabilize the physiological metabolism of rice plants,and ultimately alle-viate the loss of rice yield caused by low temperature stress.关键词
水稻/褪黑素/光合特性/抗氧化系统/产量Key words
Rice/Melatonin/Photosynthesis characteristics/Antioxidant system/Yield分类
农业科技引用本文复制引用
徐令旗,杜晓东,蔡永盛,杨丽敏,赵海新,陈书强,韩笑,薛菁芳,黄晓群..外源褪黑素对不同生育时期低温处理水稻光合特性、抗氧化系统及产量的影响[J].山东农业科学,2025,57(9):64-71,8.基金项目
黑龙江省属科研院所科研业务费项目(CZKYF2024-1-B011) （CZKYF2024-1-B011）
市级科技计划创新激励项目(NY2023JL0010) （NY2023JL0010）
黑龙江省水稻现代农业产业技术体系协同创新推广体系项目(2025-2027) （2025-2027）
