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| Effects of Tea Saponin on Seed Germination, Root Lengths and Soil Enzyme Activities |
| Received:October 26, 2014 |
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| KeyWord:tea saponin;seed germination;root length;enzyme activity;ecological toxicity |
| Author Name | Affiliation | E-mail | | HOU Jun-jie | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LI Ni-ni | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | Lü Hui-xiong | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | ZENG Qiao-yun | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | qiaoyunzeng@126.com | | WU Qi-tang | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| Tea saponin, as a biosurfactant, has great potential to be applied to the environmental remediation. However, it has certain biological toxicity to soil ecosystem. In this study, seeds of Chinese flowering cabbage(Brassica parachinensis), mung bean(Vigna radiata L.) and maize(Zea mays L.) were selected to examine the influences of tea saponin added to soil on seed germination rates, root elongations, and the activities of soil catalase and polyphenol oxidase. Results showed that the seed germination rates(excluding mung bean) and root lengths of three plant species were significantly inhibited by tea saponin at the experimental concentrations. The inhibitory effects aggravated with increasing concentrations of tea saponin. When tea saponin concentration was 0.2%, the root lengths significantly decreased more than 33.1% and the germination rates reduced more than 10%, compared with the control(without tea saponin). The inhibition of tea saponin on germination rates and root lengths were dependent on the plant types. The germination rates decreased in order of maize > Chinese flowering cabbage > mung bean, while root lengths decreased in order of Chinese flowering cabbage > maize > mung bean. With increasing concentrations of tea saponin, catalase activity in soil decreased significantly, while soil polyphenol oxidase activity increased significantly. |
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