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| Accumulation of Cd in cell wall pectin of tomato plants grown in greenhouse soil of different planting years |
| Received:July 18, 2017 |
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| KeyWord:greenhouse soil;tomato;cell wall;pectin;pectin methyl esterase;Cd |
| Author Name | Affiliation | | GUO Jun-kang | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | ZHOU Ran | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | REN Xin-hao | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | WEI Ting | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | XU Hui-hui | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | LI Yan-ping | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | LÜ Xin | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China |
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| Abstract: |
| Total and available Cd content in soil is known to increase with increase in the number of planting years; therefore, the pectin content, pectin methyl esterase(PME) activity, and Cd content in pectin from different organs in tomato plants(Lycopersicon esculentum) will also be affected. To investigate the effects of greenhouse soil of different planting years on Cd accumulation in pectin of tomato plants, a field study was performed using tomato plants that were grown in soil aged for 2 and 14 planting years. The pectin contents in stem and leaf cell walls were determined, and the correlations between cell wall pectin content, PME activity, planting years, and Cd content were analyzed. The results showed that Cd accumulation in all organs increased with the increase in planting years. Compared to plants that were grown in greenhouse soil of 2 planting years, Cd accumulation increased by 24.55% in stems and 45.96% in leaves of plants that were grown in soils of 14 planting years. In addition, Cd accumulation increased by 61.86% and 57.46% in stem cell walls and leaf cell walls, respectively. Therefore, Cd accumulation in the pectin of cell walls was significantly different owing to different planting years(P<0.05). In addition, with the increase of planting years, pectin content and PME activity in cell walls also increased. Pectin content increased by 104.51% in stems and 127.45% in leaves, and PME activity increased by 10.56% in stems and 9.39% in leaves. Both pectin content and PME activity were positively correlated with cell wall Cd accumulation. Overall, results from the present study demonstrated that total and available Cd content in soil were influenced by different planting years, which affected pectin content and PME activity in different organs of tomato plants. This indicates that cell wall pectin plays a key role in alleviating Cd toxicity in tomato plants. |
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