AM25 — Sorghum bicolor

Summary

SbAM25 (SORBI_3010G092600) on sorghum chromosome 10 encodes an aquaporin-like protein with transmembrane transporter activity for lactate, arsenite, silicate, glycerol, borate, urea and water, as well as channel activity and protein binding. It is associated with the transport of lactate, silicic acid, borate, arsenite, urea and hydrogen peroxide across membranes, and with cellular responses to boron, arsenic, glucose and hypoxia. The gene is linked to phenylpropanoid biosynthesis and defence regulation. Localisation evidence places the product at the lateral plasma membrane, Casparian strip, endoplasmic reticulum, cytoplasm and nucleus. Associations with boron uptake and deficiency tolerance, arsenite and arsenate tolerance, aluminium tolerance and translocation, urea uptake, and pollen development and pollination have been reported. Studies of related genes in other species connect the family to silicon transport, salt and drought stress responses, grain number, seed weight, biomass yield and water use efficiency.