Effects of silicon on arsenate uptake by rice (Oryza sativa L.) seedlings in solution culture
Solution culture experiments were conducted to investigate the effect of silicon (Si) on arsenic (As (V)) uptake by rice. Both intemal and external Si significantly decreased shoot and root As concentrations. Meanwhile, we investigated the possible mechanism of Si effects on As (V) uptake by using a wild-type rice and its low-silicon (lsil) mutant. The results showed that Si significantly decreased shoot and root As concentrations of wild type rice, but had little effect on those of the mutant rice. Arsenic speclarion analysis of the xylem sap of the wild type rice indicated that Si significantly decreased As (III) concentration but had little effect on As (V) concentration in xylem sap. These results further showed that As (III) may be loaded to xylem partly via the active Si transporter. It may be the mechanism involved in Si mediated reduction of As uptake by rice.
arsenate mutant rice silicate uptake
W Guo Y. G. Zhu
Research Center for Eco-Environrnental Sciences, The Chinese Academy of Sciences, Beijing 100085, P. R. China
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
732-733
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）