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| Toxic effects of dimethyl phthalate on cucumber at the growth stage |
| Received:December 16, 2016 |
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| KeyWord:DMP;Cucumis sativus L.;antioxidant enzyme;dry matter;fruit quality |
| Author Name | Affiliation | | ZHANG Ying | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | DONG Jun-wei | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | WANG Lei | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | FAN Xin-hui | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | SUN Rui-xue | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | ZHANG Hui | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | SHAN De-xin | College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China |
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| Abstract: |
| The leaves of cucumber (Cucumis sativus L.) were used to study the effects of dimethyl phthalate (DMP) on antioxidant enzyme activities and proline (Pro) and malondialdehyde (MDA) content. Furthermore, the fruit quality and the accumulation of DMP were studied to investigate the ecological toxic effects of DMP on cucumber. The results showed that the activities of antioxidant enzymes in the leaves treated with 30 mg·L-1 DMP were increased, with a decrease in the nutritional value of the fruit. However, this had a very little impact on the accumulation of dry matter and plant growth. Under the treatment of 50 mg·L-1 DMP, the antioxidant enzyme activities of the leaves achieved their peak value at full-blooming stage. The antioxidant enzyme activities, the accumulation of dry matter, and the fruit nutritional value all declined with increasing treatment time. However, under the treatments of 100 mg·L-1 and 200 mg·L-1 DMP, the antioxidant enzyme activities were remarkably suppressed (P<0.05) as compared to those of the control group during the entire growth period. Moreover, with increasing concentration of DMP, a decline in the accumulation of dry matter was presented, with the appearance of a fatal wilting phenomenon during the young fruit period. The accumulation of DMP in the cucumber increased with increasing concentrations (stem > root > leaf). These results showed that DMP pollution could affect the normal physiological and biochemical indices of cucumber, reduce the quality of cucumber fruit, and hence pose potential health risks. |
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