| 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 |
| Key Words: grafted watermelon calcium nitrate stress Gd2(CO3)3 antioxidase activity photosynthesis |
| Author Name | Affiliation | | ZHANG Hao | Anhui Science and Technology University, Fengyang, Anhui 233100, China | | LU Xiao-min | Anhui Science and Technology University, Fengyang, Anhui 233100, China | | LI Kun | Anhui Science and Technology University, Fengyang, Anhui 233100, China | | WU Xiu | Anhui Science and Technology University, Fengyang, Anhui 233100, China |
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| Abstract: |
| 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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