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| Physiological response and antioxidant system characteristics of maize（Zea mays L.） seedlings under cadmium and arsenic stress |
| Received:July 03, 2023 |
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| KeyWord:maize;cadmium;arsenic;stress;physiological characteristics;antioxidant system |
| Author Name | Affiliation | E-mail | | SONG Lin | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | LIU Mengyu | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | ZHOU Hang | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | ZENG Peng | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | LIAO Bohan | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | GU Jiaofeng | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | gujiaofeng@csuft.edu.cn |
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| Abstract: |
| To investigate the physiological traits, heavy metal accumulation, and antioxidant system characteristics of maize seedlings under cadmium（Cd）and arsenic（As）stress, hydroponic experiments were conducted, and cultivar DJ26 with low Cd accumulation characteristics was used. The results showed that under single As stress, plant fresh weight and leaf total chlorophyll concentration of maize decreased by 76.0% and 52.8%, respectively. The growth traits of maize under single Cd and combined stress with low concentrations of Cd and As showed small differences and certain tolerance. Cd content in all parts of maize increased as Cd concentration increased in the solution; furthermore, root Cd content increased by 14.1% - 103.5% after adding As to the solution, with stem and leaf Cd content decreasing by 28.9%-72.6%. Compared with single As stress, adding Cd to the solution increased stem and leaf As content by 170.1%- 198.8%. Therefore, As promoted Cd accumulation in the root and reduced Cd transport to the aboveground part under combined stress, whereas Cd promoted As transport to the aboveground part. Maize has strong antioxidant regulation ability under combined stress. The activities of superoxide dismutase（SOD）and peroxidase（POD）in maize root under compound stress showed a trend of first increasing and then decreasing with the increase in Cd concentration in the solution. In contrast, catalase（CAT）and ascorbate peroxidase（APX） activities were significantly higher than those under single Cd stress. CAT and APX activities increased by 366.0% - 1 409.8% and 1 372.7%-4 366.7%, respectively, in the leaf and 27.4%-702.2% and 230.0%-1 004.0%, respectively, in the root. Malondialdehyde（MDA） content increased in the maize leaves and decreased in the roots under combined stress. The leaves were significantly affected by Cd and As. This study demonstrated that DJ26 seedlings have a certain tolerance to single Cd or combined stress at low concentrations of Cd and As; the roots showed strong accumulation capacity and limited translocation capacity for Cd and As, expressing the potential for safe production in farmlands under strict control for single Cd pollution or combined Cd and As pollution. |
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