Effects of phosphorus on absorption and transport of selenium in rice seedlings
- 53 Downloads
The effects of different concentrations of phosphorus (P) on absorption and transfer of selenium (Se) in rice seedlings were studied by hydroponics experiment. The interaction between iron plaque and phosphorus on absorption and transport of selenium were studied by adding a large amount of iron-induced iron plaque, to provide a theoretical basis for rational application of phosphate fertilizer in the selenium bio-strengthening process of rice. The results showed that phosphorus deficiency may result in the formation of reddish brown iron oxide coating on the root surface of rice. The formation of root iron plaque of rice is related to concentration of phosphorus, and low concentration of phosphorus (0–1.5 mmol L−1) can increase the amount of root iron plaque. Compared P deficiency culture and 2 mmol L−1 P culture, Se content in the shoots and roots decreased by 76 and 47%, respectively. Addition of Fe2+ significantly reduced biomass of shoot and had no significant effect on the roots; when the P concentration increased from 0.1 to 0.3 mmol L−1, transfer coefficient of Se decreased. Therefore, both root iron plaques induced by phosphorus deficiency and iron addition have a strong adsorption effect on selenium, which reduces the transport of selenium from the rice roots to the shoots. In the lower range of phosphorus concentration, low phosphorus can promote selenium content of rice shoot, while higher on the contrary. In the practice of rice production, proper management of phosphorus nutrient is of great significance to control selenium content in rice grain.
KeywordsPhosphorus Iron plaque Rice seedling Transfer and absorption Selenium
This study is financially supported by The National Key R&D Program of China (2017YFD0200200/2017YFD0200208) and The National Natural Science Foundation of China (No. 31672238; 31372141).
- Bao SD (2000) Analysis of soil agricultural chemistry, Third edn. China Agriculture Press, Beijing, pp 268–270 (In Chinese)Google Scholar
- Liu WJ, Hu Y, Zhu YG, Gao RT, Zhao QL (2008) The mechanisms of iron plaque formation on the surface of rice roots induced by P starvation (In Chinese). Plant nutrition and fertilizer. Science 14(1):22–27Google Scholar
- Liu HJ, Zhang JL, Han XR, Zhang FS (2009) Influences of iron plaque on element uptake by plants and its affecting factors (In Chinese). Soils 41(3):335–343Google Scholar
- Rotruck JT, Pope AL, Ganther HE, Swanson AB, Hafeman DG, Hoekstra WG (1973) Selenium: biochemical role as a component of glutathione peroxidase. Nutr Rev 38(8):588–590Google Scholar
- Ye ZH, Cheung KC, Wong MH (2001) Copper uptake in typha latifolia as affected by iron and manganese plaque on the root surface. Can J Bot 79(3):314–320Google Scholar
- Zeng XZ, Lu SH, Liu WJ, Zhang XK, Zhang FS (2001) Effects of root surface iron and manganese oxide plaque on iron, manganese and phosphorus,zinc nutrition of rice (In Chinese). Southwest China. J Agric Sci 14(4):34–38Google Scholar
- Zhang CM, Zhou XB, Gao AX (2017) Uptake and accumulation of Se and iron coating on rice root at different growth stages (In Chinese). Acta Pedol Sin 54(3):692–701Google Scholar
- Zhou XB, Yu SH, Xie D (2015) Effects of pH and three kinds of anions on Se absorption and desorption in purple soil (In Chinese). Acta Pedol Sin 52(5):119–125Google Scholar