Brachypodium BdABCG25 is a homolog of Arabidopsis AtABCG25 involved in the transport of abscisic acid

Abscisic acid (ABA), a stress hormone produced by plants to cope with various environmental stresses, has potential as a mobile molecule. Recently, several types of ABA transporters have been described. We previously found a membrane transporter, AtABCG25, that is involved in intercellular ABA transport in Arabidopsis thaliana . However, it is not yet known whether there are any homologs of AtABCG25 in different plant species. Here, we identified a homolog of AtABCG25 in Brachypodium distachyon , named BdABCG25, and characterized its function. We examined the ABA transport activity of BdABCG25 and the physiological properties of BdABCG25 expression in Arabidopsis . The results suggest that BdABCG25 is a putative functional homolog of AtABCG25. Regulating intercellular ABA transport may be a novel strategy for breeding stress‐tolerant monocot crops.