Wu Chan-Cui, Liu Jie, Zhang Xue-Hong, Wei Shi-Guang
School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin, 541004, People's Republic of China.
Light industry and Food Engineering College, Guangxi University, Nanning, 530004, People's Republic of China.
Bull Environ Contam Toxicol. 2018 Dec;101(6):738-743. doi: 10.1007/s00128-018-2445-y. Epub 2018 Oct 10.
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 (V) 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.
采用盆栽试验研究了磷添加对李氏禾吸收六价铬的影响。设置了缺磷和不添加磷的对照。六价铬的吸收遵循米氏动力学。与对照相比，供磷使米氏常数（Km）降低了16.9%，缺磷使最大吸收速率（V）降低了18%，这表明磷与李氏禾吸收六价铬之间不存在抑制和竞争作用。此外，磷和六价铬之间存在协同作用，表明李氏禾根系吸收六价铬可能是一个主动过程。生物富集系数（BCF）和转运系数（TF'）随供磷量增加而升高。最高的BCF比对照高3.6倍，表明额外的磷有助于李氏禾将铬从根部转运到地上部分的能力提高。
