Phosphorus Enhances Cr(VI) Uptake and Accumulation in Leersia hexandra Swartz
The effects of P supplementation on chromium(VI) uptake by Leersia hexandra Swartz were studied using pot-culture experiment. P-deficiency and zero-P addition controls were included. The Cr(VI) uptake followed Michaelis–Menten kinetics. Compare with the control, the P-supply decreased the Michaelis constant (Km) by 16.9% and the P-deficiency decreased the maximum uptake velocity (Vmax) by 18%, which indicated no inhibition and competition between P and Cr(VI) uptake by L. hexandra. Moreover, there were a synergistic action between P and Cr(VI) suggests that Cr(VI) uptake by the roots of L. hexandra may be an active process. The bioconcentration factor (BCF) and the transport factor (TF′) increased with the increase in P supply. The highest BCF was 3.6-folds higher than the control, indicating that the additional P contribute to a higher ability of L. hexandra transporting Cr from root to the aboveground parts.
KeywordsLeersia hexandra Swartz Chromium (Cr) Phosphate (P) Cr hyperaccumulators Phytoremediation
The authors thank the financial supports from the National Natural Science Foundation of China (41471270, 31460155) and Guangxi Science and Technology Major Project (Gui Ke AA17204047).
- Carvalho LHM, De Koe T, Tavares PB (1998) An improved molybdenum blue method for simultaneous determination of inorganic phosphate and arsenate. Ecotoxicol Environ Restor 1:13–19Google Scholar
- López-Bucio JS, Dubrovsky JG, Raya-González J, Ugartechea-Chirino Y, López-Bucio J, de Luna-Valdez LA, Ramos-Vega M, León P, Guevara-García AA, A.A (2014) Arabidopsis thaliana mitogen-activated protein kinase 6 is involved in seed formation and modulation of primary and lateral root development. J Exp Bot 65:169–183CrossRefGoogle Scholar