Chan W F, Li W C, Wong M H
a Croucher Institute for Environmental Sciences, and Department of Biology Hong Kong Baptist University , Hong Kong SAR.
Int J Phytoremediation. 2015;17(11):1073-80. doi: 10.1080/15226514.2015.1021952.
Arbuscular mycorrhizal fungi (AMF) appear to be highly associated with arsenic (As) uptake in host plants because arsenate (As(V)) and phosphorus (P) share the same transporter, whereby AMF can enhance P uptake. A short-term experiment was conducted for low- (0 to 0.05 mM As) and high-affinity (0 to 2.5 mM As) uptake systems, to investigate the AMF role on As uptake mechanism in plants, which may explain As uptake kinetics in upland rice cultivar: Zhonghan 221. When concentration of As ranged from 0 to 0.05 mM, Funneliformis geosporum (Fg) significantly decreased arsenite (As(III)) and monomethylarsonicacid (MMA) uptake when (p < 0.05) compared to non-mycorrhizal (NM) treatment, since the major route for (As(III)) in rice roots-rice silicon transporter Lsi1 would be influenced by Fg inoculation at high As concentrations. Fg can also reduce As(V) uptake significantly (p < 0.05) under both uptake systems relative to NM treatment, whereas, Funneliformis mosseae (Fm) increased As(V) and MMA uptake in rice roots, with MMA uptake rate generally lower than As(III) and As(V). Using suitable AMF species inoculation with rice, As uptake and accumulation in rice grains can be reduced and the risk to human health, once consumed, can be minimized.
丛枝菌根真菌（AMF）似乎与宿主植物吸收砷（As）高度相关，因为砷酸盐（As(V)）和磷（P）共用同一转运体，由此AMF可增强磷的吸收。针对低亲和力（0至0.05 mM As）和高亲和力（0至2.5 mM As）吸收系统进行了一项短期实验，以研究AMF在植物砷吸收机制中的作用，这可能解释旱稻品种中旱221的砷吸收动力学。当As浓度在0至0.05 mM范围内时，与非菌根（NM）处理相比，地球管柄囊霉（Fg）显著降低了亚砷酸盐（As(III)）和一甲基砷酸（MMA）的吸收（p < 0.05），因为在高As浓度下，水稻根中As(III)的主要转运途径——水稻硅转运体Lsi1会受到Fg接种的影响。相对于NM处理，在两种吸收系统下，Fg也能显著降低As(V)的吸收（p < 0.05），然而，摩西管柄囊霉（Fm）增加了水稻根中As(V)和MMA的吸收，MMA的吸收速率通常低于As(III)和As(V)。通过给水稻接种合适的AMF物种，可减少水稻籽粒中As的吸收和积累，一旦食用，对人类健康的风险可降至最低。
