Low-affinity magnesium transporter that mediates the influx of magnesium. Plays a crucial role in male gametophyte development and male fertility. Expressed in the whole plant but preferentially in the mature anthers. Has the ability to complement mutants in Salmonella enterica and yeast lacking magnesium transport capability. May be due to an intron retention. Belongs to the CorA metal ion transporter (MIT) (TC 1.A.35.5) family.