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| Effect of exogenous phosphorus addition on phosphorus absorption and the antioxidase system of Typha angustifolia under different levels of atrazine stress |
| Received:September 15, 2020 |
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| KeyWord:atrazine;NH4H2PO4;phosphorus uptake;Typha angustifolia;antioxidase system |
| Author Name | Affiliation | E-mail | | WU Shu-wen | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | HOU Lei | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | HONG Zi-meng | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | FAN Li-ming | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China | | | YE Min | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China | yeminpc@163.com |
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| Abstract: |
| This study aimed to expound the interactive effects of atrazine and exogenous phosphorus input on the phosphorus uptake and antioxidase system of hydrophytes. A typical aquatic plant Typha angustifolia L. was employed in a hydroponic experiment to determine the combined effects of atrazine(0, 0.5, 2.0, and 5.0 mg·L-1) and exogenous phosphorus(0.5, 4.0, and 10.0 mg·L-1) on the phosphorus content, chlorophyll content, and antioxidase activities. Compared with that of the control treatment, exogenous phosphorus addition significantly increased the average phosphorus concentration in the above-ground(310.47%) and below-ground(165.81%) parts of Typha angustifolia under atrazine stress. Under low(0.5 mg·L-1) and medium(2.0 mg·L-1) levels of atrazine, the contents of chlorophyll a and chlorophyll b and the activities of catalase(CAT) and glutathione(GSH) increased, but the MDA concentration decreased with the increase in exogenous phosphorus input. In contrast, the increased exogenous phosphorus concentration reduced the chlorophyll contents and the activities of superoxide dismutase, CAT, and GSH, whereas the MDA contents increased under the high level(5 mg·L-1) of atrazine. The results suggest that exogenous phosphorus can have a positive effect on the phosphorus uptake, chlorophyll content, and antioxidase activity under low and medium levels of atrazine stress, but a negative effect under the high level of atrazine stress. Thus, this study can help to explain the physio-biochemical mechanism of aquatic plants in response to the interactions between atrazine stress and exogenous phosphorus input. |
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