为给稀土元素钕在玉米生产栽培管理中的应用提供科学依据，采用10%聚乙二醇6000模拟干旱胁迫，研究了稀土元素钕对干旱胁迫下玉米幼苗根系抗旱性的影响。结果表明，干旱胁迫显著提高了根系MDA含量和H2O2含量、SOD、CAT和APX活性，显著降低了POD、GST、GPX活性、AsA和GSH含量及根系生物量。这说明，干旱胁迫加剧了根系的氧化胁迫，同时玉米幼苗根系也通过增强抗氧化酶活性抵抗干旱胁迫造成的氧化胁迫。外源氯化钕（NdCl3）处理则可以显著提高干旱胁迫下玉米幼苗根系抗氧化酶SOD、POD、CAT、GST、GPX活性、AsA和GSH含量和根系生物量，显著降低MDA和H2O2含量，而对APX活性无显著影响。盆栽试验结果进一步说明，NdCl3对轻度和中度土壤干旱下玉米幼苗抗旱性均具有促进作用，尤其是对中度土壤干旱下玉米幼苗的抗旱性更具促进作用。上述研究结果说明，NdCl3可以提高玉米幼苗根系的抗旱能力，缓解干旱胁迫造成的伤害。
英文摘要:
In order to provide scientific evidence for the application of neodymium trichloride (NdCl3) in the production and cultivation of maize, the effects of NdCl3 on the drought resistance of maize seedling root were investigated. The results showed that drought stress significantly increased the contents of MDA and H2O2, the activities of SOD, CAT and APX, but significantly decreased the activities of POD, GST and GPX, the contents of AsA and GSH, and the biomass of root. These results indicated that drought stress made oxidative stress to maize root and the roots could alleviate the oxidative stress caused by drought stress by enhancing the activities of some antioxidant enzymes. Exogenous NdCl3 could significantly improve the activities of SOD, POD, CAT, GST and GPX, and the contents of AsA and GSH, which resulted in the decrease in the MDA content and the increase in the biomass of root. The results of pot experiments further indicated that exogenous NdCl3 could improve the drought tolerance of maize seedlings under mild and moderate drought stresses, especially for moderate drought stress. Above results indicated that NdCl3 could improve the drought resistance of maize seedling roots and protect themselves against the injury caused by drought stress.
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