Effects of Silicon Application on Uptake of Arsenic and Phosphorus and Formation of Iron Plaque in Rice Seedlings Grown in an Arsenic-Contaminated Soil
- 212 Downloads
Silicon (Si) plays important roles in improving rice growth and mitigating rice arsenic (As) uptake. In the present study, a pot experiment was carried out to investigate effects of Si application on uptake of As and phosphorus (P) and formation of iron (Fe) plaque on root surface of two rice cultivars (Zhendao 10 and Nanjing 44) grown in a high As-contaminated soil. The results showed that dry weights of shoots and roots for both rice cultivars didn’t significantly varied under low Si level, but significantly increased for Zhendao 10, while decreased for Nanjing 44 under high Si level (p < 0.05). As concentrations in shoots and roots of Nanjing 44 significantly decreased for low Si level, while significantly increased for high Si level (p < 0.05). Different from Nanjing 44, effect of Si application on As concentrations in the plants of Zhendao 10 wasn’t significant (p > 0.05). Si significantly increased concentrations of P in shoots and roots of both rice cultivars (p < 0.05). However, Si didn’t significantly affect formation of Fe plaque on root surface. These results suggest that the effects of Si application on rice growth and As uptake in As-contaminated soils may depend on type of rice cultivar and Si application level. Rice cultivar and Si application rate should be considered when Si application is used to mitigate As accumulation in rice.
KeywordsArsenic Rice Silicon Phosphorus Iron plaque
This work was supported by the Natural Science Foundation of China (41001190,41671318), the Natural Science Foundation of Jiangsu Province (BK20141479), the Qing Lan Project of Jiangsu Province, and the Six-Talent-Peaks project of Jiangsu Province (R2017L03).
- Guo W, Zhu YG, Liang YC, Liu WJ, Chen Z (2006) Effect of application of silicon on arsenic uptake by rice seedlings in soil. Environ Sci 27(7):1393–1397 (in Chinese)Google Scholar
- Li RY, Qiu YX, Liu CY, Wang YL, Huang LD (2013) Adsorption-desorption behaviors of phosphorus under different silicon concentrations in paddy soils. Chin J Soil Sci 44(5):786–791 (in Chinese)Google Scholar
- Li RY, Shen XH, Xie XJ, Xu XH, Li YX, Huang WQ, Huo YT (2014) Effect of silicon on translocation of phosphorus in soil-rice system. ACTA Pedol Sin 51(2):423–428.(in Chinese)Google Scholar
- Lu RK (1999) Analytical methods for soils and agricultural chemistry. China Agricultural Science and Technology Press, BeijingGoogle Scholar
- Stone R (2008) Arsenic and paddy rice: a neglected cancer risk. Nature 321(5886):184–185Google Scholar
- Syu CH, Huang CC, Jiang PY, Chien PH, Wang HY, Su JY, Lee DY (2015) Effects of Foliar and soil application of sodium silicate on arsenic toxicity and accumulation in rice(Oryza sativa L.) seedlings grown in As-contaminated paddy soils. Soil Sci Plant Nutr. https://doi.org/10.1080/00380768.2015.1125763 CrossRefGoogle Scholar
- Wang HY, Wen SL, Chen P, Zhang L, Cen K, Sun GX (2016) Mitigation of cadmium and arsenic in rice grain by applying different silicon fertilizers in contaminated fields. Environ Sci Pollut Res 23(4):1–8Google Scholar