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| Effects of phosphorus on cadmium accumulation and antioxidant enzyme activities of alfalfa |
| Received:November 29, 2022 |
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| KeyWord:alfalfa;phosphorus;cadmium;antioxidant enzyme |
| Author Name | Affiliation | E-mail | | DENG Suifeng | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LIAO Yumeng | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHANG Hao | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yanqun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | 649332092@qq.com |
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| Abstract: |
| To explore the effects of phosphorus application on cadmium accumulation and antioxidant enzyme activity of alfalfa, pot experiments were conducted to assess the effect of phosphorus on biomass, cadmium content, subcellular distribution, malondialdehyde (MDA)content, and the activities of peroxidase(POD), superoxide dismutase(SOD), and catalase(CAT)under cadmium stress. The results showed that alfalfa biomass and activities of POD, SOD, and CAT first increased and then decreased with increasing phosphorus application levels under the same cadmium treatment concentration. The content of cadmium in the shoots and roots decreased by 41.7% and 39.2% at most. Under the same phosphorus application level, the biomass of alfalfa increased by 28.8% at most in the 2 mg · kg-1 cadmium treatment, whereas it was decreased by 9% at most in the 20 mg·kg-1 cadmium treatment. MDA content and CAT activity were significantly increased, while POD and SOD activities increased first and then decreased with increasing cadmium treatment contents. The content of cadmium in subcellular fractions was in the following order:cell wall>cytoplasm>mitochondria>chloroplast, which decreased significantly with the increase of phosphorus application contents, the highest percentage of cadmium in cell wall was 64%. Taken together, the results indicate that the tolerance of alfalfa to cadmium is promoted, and the toxic effect of cadmium on alfalfa is alleviated through phosphorus application. |
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