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| Atrazine stress response of antioxidant enzyme activities and root exudates in the roots of Typha angustifolia L. |
| Received:February 22, 2021 |
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| KeyWord:atrazine;Typha angustifolia;root exudates;antioxidant enzyme activity |
| Author Name | Affiliation | E-mail | | WU Shuwen | 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 | | | LIU Yungen | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | FAN Liming | 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 aimes to investigate the effects of atrazine stress on the physiological characteristics of hydrophyte roots. This was done using a typical aquatic plant, Typha angustifolia L., in a hydroponic experiment to determine the effects of atrazine. Experiments tested four atrazine concentrations(i.e., 0, 0.2, 0.4 mg·L-1, and 2.0 mg·L-1), examining the atrazine content, root exudates, and antioxidant enzyme activities for 45 d. The results showed that atrazine might accumulate in the root system of T. angustifolia L. and significantly reduce plant biomass(P<0.05). An increasing atrazine concentration led to a continuous elevation of methane dicarboxylic aldehyde content and a significant decrease in superoxide dismutase activity. The catalase activity initially increased and then decreased(P<0.05), reaching a maximum at 0.4 mg·L-1, which was 123.7% higher than that of the control. Atrazine stress had no significant effect on glutathione activity. The variation in the types of compounds released in the T. angustifolia root exudates increased with the increase of atrazine concentration. Under atrazine stress, root exudates mainly comprised alkanes, olefins, esters, amines, alcohols, phenols, ketones, and organic acids; of these, the types and relative content of alkanes remained the largest. The exudation of esters and alcohols was inhibited by high concentrations of atrazine stress(≥ 2 mg·L-1), whereas the exudation of phenols and organic acids was promoted. The content of atrazine and MDA in the roots was positively correlated with the relative content of phenols and organic acids, respectively. This study indicates that the oxidative stress caused by atrazine activates the antioxidant defense system of cattails, and the plant responds to the stress by regulating the composition and content of root exudates, and ultimately reducing the accumulation of biomass. |
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