胶质类芽孢杆菌衍生氮掺杂碳量子点及其缓解烟草盐胁迫的研究
牛旭朝 , 田保华 , 张国艳 , 冯军鹏 , 曹青 , 梁海霞
现代化工 ›› 2025, Vol. 45 ›› Issue (S2) : 219 -225.
胶质类芽孢杆菌衍生氮掺杂碳量子点及其缓解烟草盐胁迫的研究
Study on nitrogen-doped carbon quantum dots derived from Paenibacillus mucilaginosus for alleviating salt stress in tobacco
To examine the regulation of antioxidant capability of Paenibacillus mucilaginosus(P.m.)-derived Carbon Quantum Dots (CQDs) by carbon to nitrogen ratio.Nitrogen-doped carbon quantum dots (N-CQDs) were synthesized through a one-step hydrothermal method using P.m.cultured under varying carbon-to-nitrogen (C∶N) ratios.The synthesized N-CQDs were analyzed by TEM,XPS,FT-IR and XRD characterization methods,their free radical scavenging capacity and their protective effects against NaCl stress-induced oxidative in tobacco were systematically investigated.The results showed that N0.5-CQDs exhibited superior free radical scavenging capacity compared to N0-CQDs and N5-CQDs,attributed to their higher content of hydroxyl (—OH),carboxyl (—COOH),and amino (—NH2) functional groups;N0.5-CQDs exhibited optimal radical scavenging activity,demonstrating removal rates of 76.3% for superoxide radicals ($\cdot \mathrm{O}_{2}^{-}$),60.9% for hydroxyl radicals (·OH),and 79.3% for DPPH radicals,with corresponding IC50 values of 0.86,1.72,and 0.71 mg/mL,respectively.Under NaCl stress,the H2O2 and MDA contents of tobacco leaves were significantly increased,accompanied by visible brown precipitation;Furthermore,the N0.5-CQDs+NaCl treatment reduced H2O2 and MDA accumulation and enhanced the activity of key antioxidant enzymes,increasing superoxide dismutase (SOD) and catalase (CAT) activities by 27.73% and 22.25%.Concurrently,it elevated non-enzymatic antioxidant levels,with ascorbic acid (ASA) and glutathione (GSH) contents rising by 31.91% and 30.49%,respectively.These results demonstrate that N0.5-CQDs exhibit dual antioxidant functionality:synergistic upregulation of both enzymatic (SOD,CAT) and non-enzymatic (ASA,GSH) antioxidant systems,collectively attenuating NaCl-induced oxidative damage in tobacco.
C∶N比 / 盐胁迫 / 活性氧 / 碳量子点 / 胶质类芽孢杆菌
C∶N / salt stress / reactive oxygen species / carbon quantum dots / Paenibacillus mucilaginosus
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山西省基础研究计划面上项目(202203021221024)
山西省中央引导地方科技发展资金项目科技创新基地建设(YDZJSX2024B016)
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