稀土元素钕对玉米幼苗根系抗旱性的影响  

Effects of Neodymium Trichloride on the Drought Resistance of Maize Seedling Root

作　　者：单长卷[1] 陈向东[1] 

机构地区：[1]河南科技学院/现代生物育种河南省协同创新中心,河南新乡453003

出　　处：《玉米科学》2017年第3期54-58,共5页Journal of Maize Sciences

基　　金：河南省教育厅科学技术研究重点项目(13A180302)

摘　　要：采用10%聚乙二醇6000模拟干旱胁迫,研究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,干旱胁迫显著提高根系丙二醛(MDA)含量和过氧化氢(H_2O_2)含量,提高超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性,显著降低了过氧化物酶(POD)、谷胱苷肽转移酶(GST)、谷胱甘肽过氧化物酶(GPX)活性,显著降低抗坏血酸(As A)和谷胱苷肽(GSH)含量及根系生物量。干旱胁迫加剧了根系的氧化胁迫,玉米幼苗根系通过增强抗氧化酶活性抵抗干旱胁迫。外源氯化钕(NdCl_3)处理可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,显著提高AsA和GSH含量和根系生物量,显著降低MDA和H_2O_2含量,对APX活性无显著影响。盆栽实验结果进一步说明,NdCl_3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,对中度土壤干旱下玉米幼苗的抗旱性促进作用更佳。NdCl_3可提高玉米幼苗根系的抗旱能力,缓解干旱胁迫造成的伤害。In order to provide scientific evidence for the application of neodymium trichloride （NdCI3） in the production and cultivation of maize, the effects of NdC13 on the drought resistance of maize seedling root were inves- tigated. The results showed that drought stress significantly increased the contents of MDA and H202, 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 en- zymes. Exogenous NdC13 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.

关 键 词：玉米 聚乙二醇 氯化钕 根系 干旱胁迫 

分 类 号：S513.01[农业科学—作物学]