| 张皓,陆晓民,李坤,吴秀.稀土钆对硝酸盐胁迫下西瓜幼苗抗氧化酶活性等生理特性的影响[J].干旱地区农业研究,2016,34(3):169~173 |
| 稀土钆对硝酸盐胁迫下西瓜幼苗抗氧化酶活性等生理特性的影响 |
| Effects of rare earth gadolinium on antioxidase activity and other physiological characteristics of watermelon seedling under nitrate stress |
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| DOI：10.7606/j.issn.1000-7601.2016.03.27 |
| 中文关键词: 嫁接西瓜 硝酸钙胁迫 碳酸钆 抗氧化酶活性 光合 |
| 英文关键词:grafted watermelon calcium nitrate stress Gd2(CO3)3 antioxidase activity photosynthesis |
| 基金项目:安徽省现代农业产业技术体系专项“蔬菜产业技术体系”(AHCYTX-13)；安徽高校省级自然科学研究项目(KJ2013Z040)；安徽科技学院专项(ZRC2013348)及大学生创新创业训练计划项目(201410879019) |
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| 中文摘要: |
| 采用硝酸盐［Ca(NO3)2］胁迫处理，研究了稀土钆［Gd2(CO3)3］对嫁接西瓜幼苗生长与相关生理特性的影响。结果表明：与对照相比，Ca(NO3)2胁迫下嫁接西瓜幼苗叶片超氧阴离子(O-·2）产生速率及过氧化氢(H2O2)、丙二醛(MDA)含量增加，膜透性增强，致使其净光合速率（Pn）、气孔导度（Gs）、胞间CO2浓度（Ci）和蒸腾速率（Tr）分别显著下降64.2%、81.6%、27.1% 和71.5%，幼苗干物质积累减少38.9%，生长显著受抑。叶面喷施Gd2(CO3)3可提高Ca(NO3)2胁迫下嫁接西瓜幼苗叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)等抗氧化酶活性，降低O-·2产生速率、H2O2和MDA含量及细胞膜透性，缓解Ca(NO3)2胁迫下Pn、Gs、Tr值的下降幅度，促进干物质的积累，幼苗干重增加29.2%，生长加快。可见，Gd2(CO3)3可通过调节Ca(NO3)2胁迫下嫁接西瓜幼苗抗氧化性，减少其膜脂过氧化程度，进而维持其较高的光合性能，有效促进了Ca(NO3)2胁迫下嫁接西瓜幼苗的生长。 |
| 英文摘要: |
| An experiment was conducted to investigate the effects of Gd2(CO3)3 on the antioxidase activity and other physiological characteristics of grafted watermelon seedlings under nitrate stress. Compared with the control, nitrate stress significantly increased the superoxide anion (O-·2) production rate, hydrogen peroxide (H2O2) contents, malondialdehyde (MDA) contents and cell membrane permeability of grafted watermelon seedling leaves, while decreased the leaf net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr) by 64.2%, 81.6.%, 27.1% and 71.5%, respectively, and dry matter accumulation was reduced by 38.9%. However, applying Gd2(CO3)3 could improve the activities of superoxide (SOD), peroxidase (POD) and catalase (CAT), decrease the O-·2 production rate, H2O2 contents, MDA contents and cell membrane permeability, alleviate the drop range from Pn, Gs and Tr, and increase the dry matter accumulation by 29.2%. Therefore, Gd2(CO3)3 treatment could keep a high photosynthetic performance, and effectively promote grafted watermelon seedlings growth through the adjustment of the protective enzyme activity and reduction of membrane lipid peroxide level under nitrate stress. |
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