Figure 7.

A proposed role of the MtABCG20 in Medicago roots and seeds.(a) MtABCG20 is an abscisic acid (ABA) exporter from biosynthesizing cells in roots (vascular parenchyma cells) enabling delivery of this hormone to the place where ABA‐dependent responses occur. In this way, MtABCG20 could positively affect lateral root (LR) primordium formation and exert a negative effect on the development of nodule primordia in Medicago.

(b) In seeds MtABCG20 is responsible for extrusion of ABA from the hypocotyl–radicle transition zone, thereby facilitating germination.