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| Effects of proline application and their potential mechanisms on pakchoi under aluminum stress in acidic soil |
| Received:August 14, 2017 |
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| KeyWord:exogenous Pro;pakchoi;yield;physiological characteristics |
| Author Name | Affiliation | E-mail | | LÜ Bo | College of Resources and Environment, Huazhong Agricultural University, Microelement Research Center, Wuhan 430070, China | | | WANG Yu-han | College of Resources and Environment, Huazhong Agricultural University, Microelement Research Center, Wuhan 430070, China | | | JIANG Cun-cang | College of Resources and Environment, Huazhong Agricultural University, Microelement Research Center, Wuhan 430070, China | jcc2000@mail.hzau.edu.cn |
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| Abstract: |
| The aim of this study was to investigate the effects of proline(Pro) application and their potential mechanisms on pakchoi under aluminum(Al) stress in acidic soil. A pot experiment was carried out in acidic soil, with pakchoi as the test material. The experiment consisted of different concentrations of exogenous Pro with Al:T1(0 mg·kg-1 Al + 0 mmol·L-1 Pro), T2(27 mg·kg-1 Al + 0 mmol·L-1 Pro), T3(27 mg·kg-1 Al + 10 mmol·L-1 Pro), T4(27 mg·kg-1 Al + 20 mmol·L-1 Pro), and T5(27 mg·kg-1 Al + 50 mmol·L-1 Pro), to study the physiological characteristics of the pakchoi and the soil properties. The results showed that compared to T1 treatment, T2 treatment resulted in a significant decrease in the antioxidant enzyme activities, the yield of pakchoi, and soil pH. The yield of pakchoi and soil pH were remarkably reduced by 10.6% and 0.75, respectively. On the other hand, the malondialdehyde(MDA) content and aluminum concentration of the leaves and active Al content of the soil increased considerably. Aluminum in the leaves of the pakchoi and the active Al content of the soil increased by 24.3% and 15.3%, respectively. Apparently, aluminum stress inhibited the growth of the pakchoi. Compared to Al treatment alone(T2), different concentrations of exogenous Pro with the T3, T4, and T5 treatments significantly increased the yield of the pakchoi by 29.3%, 38.4%, and 65.2%, respectively. Moreover, exogenous Pro also improved the activities of antioxidant enzymes, whereas the MDA and Al contents of the leaves and the active Al content of the soil obviously decreased. Additionally, aluminum contents in the leaves of the T3, T4, and T5 treatments declined by 20.4%, 45.6%, and 49.8%, respectively. It could be suggested that exogenous Pro may provide relief to pakchoi under Al stress, with the remission effect in the order of T5 > T4 > T3, i.e., the effect of 50 mmol·L-1 Pro was the best. |
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