In-vitro auxin transport in membrane vesicles from maize coleoptiles

Abstract
When membrane vesicles from maize (Zea mays L.) coleoptiles are extracted at high buffer strength, a pH-driven, saturable association of [14C] indole-3-acetic acid is found, similar to the in-vitro auxin-transport system previously described for Cucurbita hypocotyls. The phytotropins naphthylphthalamic acid and pyrenoylbenzoic acid increase net uptake, pressumably by inhibiting the auxin-efflux carrier.