Introduction Seven As resistant bacteria ARB have

1. Introduction
Seven As-resistant bacteria (ARB) have been isolated from the rhizosphere of As-hyperaccumulator Pteris vittata from the field in North Central Florida ( Ghosh et al., 2011). P. vittata prefers to grow in alkaline soils, which are characterized by low P and Fe availability and/or high concentrations of As ( Lessl and Ma, 2013). Phosphorus and As compete for uptake into bacterial cells, so bacteria have developed an effective system to increase P solubility from soils.