| 硅锌互作对镉胁迫下玉米生长及生理参数的影响 |
| 摘要点击 595 全文点击 64 投稿时间：2024-01-15 修订日期：2024-05-11 |
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| 中文关键词 玉米 镉（Cd）胁迫 硅（Si） 锌（Zn） 根系构型 |
| 英文关键词 maize cadmium（Cd）stress silicon（Si） zinc（Zn） root architecture |
| 作者 | 单位 | E-mail | | 魏畅 | 河南农业大学资源与环境学院, 郑州 450046 | wyjyl1009@163.com | | 马耀武 | 河南农业大学资源与环境学院, 郑州 450046 | | | 张振宇 | 河南农业大学资源与环境学院, 郑州 450046 | | | 张麒宇 | 河南农业大学资源与环境学院, 郑州 450046 | | | 吴天赐 | 河南农业大学资源与环境学院, 郑州 450046 | | | 焦秋娟 | 河南农业大学资源与环境学院, 郑州 450046 | | | 申凤敏 | 河南农业大学资源与环境学院, 郑州 450046 | | | 刘芳 | 河南农业大学资源与环境学院, 郑州 450046 | | | 赵颖 | 河南农业大学资源与环境学院, 郑州 450046 | | | 姜瑛 | 河南农业大学资源与环境学院, 郑州 450046 | | | 柳海涛 | 河南农业大学资源与环境学院, 郑州 450046 | liuhaitaoky@henau.edu.cn |
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| 中文摘要 |
| 为评估Cd胁迫条件下施加外源Si和Zn对玉米根系构型及生理效应的影响,通过水培试验,以玉米品种郑单958为供试材料,探究在50 μmol·L-1 Cd胁迫条件下,分别施加1 mmol·L-1 Si和100 μmol·L-1 Zn对玉米幼苗生长、光合系统、Cd含量及其吸收动力学、丙二醛含量和抗氧化物质的影响,并通过主成分分析进行评价. 结果表明,Cd显著抑制玉米幼苗的生长,主根长、株高和生物量显著下降,根系发育和光合系统受到影响,丙二醛和抗氧化物质含量显著提升. Cd胁迫条件下,施加外源Si和Zn能够有效降低幼苗对Cd的最大吸收速率,通过改善AsA-GSH循环减轻氧化损伤,丙二醛质量摩尔浓度下降,光合作用增强,有效改善玉米幼苗的生长状态,其中主根长和株高分别提高了9.19%~40.88%和14.35%~18.92%；地下部和地上部干重分别增加了51.76%~151.76%和53.11%~84.31%,Si-Zn互作对Cd毒害的缓解效果略优于单独施加Si或Zn；其中Si在抑制玉米Cd吸收方面起到了重要作用,地下部和地上部Cd含量分别显著减少了43.55%和80.43%. 外源施加Si和Zn可通过调节抗氧化物质含量以缓解Cd诱导的氧化损伤,增强光合作用,促进玉米幼苗生长,并有效提高玉米幼苗对Cd毒害的耐受能力,有利于重金属污染农田合理利用和粮食安全生产. |
| 英文摘要 |
| To evaluate the effects of exogenous Si and Zn on the root architecture and physiological effects of maize under Cd stress, a hydroponic experiment was conducted to investigate the effects of 1 mmol·L-1 Si and 100 μmol·L-1 Zn on the growth, photosynthetic system, Cd concentration, absorption kinetics, malondialdehyde （MDA） content, and antioxidant of maize seedlings （Zhengdan 958） under 50 μmol·L-1 Cd stress, which were evaluated using principal component analysis. The results showed that Cd stress significantly inhibited the growth of maize seedlings. The main root length, plant height, and biomass decreased significantly； root development and photosynthetic system were inhibited； and MDA and antioxidant content increased significantly. Under Cd stress, the application of exogenous Si and Zn could effectively reduce the maximum absorption rate of Cd in seedlings and reduce oxidative stress by improving the AsA-GSH cycle, decreasing MDA content, and enhancing photosynthesis, which effectively improved the growth status of maize seedlings. The main root length and plant height were increased by 9.19%-40.88% and 14.35%-18.92%, respectively. The dry weight of the root and shoot were increased by 51.76%-151.76% and 53.11%-84.31%, respectively, and the alleviation effect of Si-Zn interaction on Cd toxicity was slightly better than that of Si or Zn alone. Among them, Si played an important role in inhibiting Cd uptake by maize. The Cd concentration in the underground and aboveground parts was significantly reduced by 43.55% and 80.43%, respectively. The results showed that exogenous application of Si and Zn could alleviate Cd-induced oxidative stress by regulating the content of antioxidant, enhancing photosynthesis, promoting the growth of maize seedlings, and effectively improving the tolerance of maize seedlings to Cd toxicity, which was conducive to the rational utilization of heavy metal-contaminated farmland and food security production. |
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