Low-affinity magnesium transporter that mediates the influx of magnesium. Isoform 1 is expressed in the whole plant. Isoform 4 is expressed only in roots and flowers. Displays plantlets with retarded development under low Mg(2+) concentrations growth conditions. Has the ability to complement mutants in Salmonella enterica and yeast lacking magnesium transport capability. Belongs to the CorA metal ion transporter (MIT) (TC 1.A.35.5) family. Sequencing errors.