PIN-driven auxin transport emerged early in streptophyte evolution. 

 -  Nature Plants, 5(11), p.1114-1119, 2019 .
<br/><br/> PIN-FORMED (PIN)transporters mediate directional, intercellular movement of the phytohormone auxin in land plants. To elucidate the evolutionary origins of this developmentally crucial mechanism, we analysed the single PIN homologue of a simple green alga Klebsormidium flaccidum. KfPIN functions as a plasma membrane-localized auxin exporter in land plants and heterologous models. While its role in algae remains unclear, PIN-driven auxin export is probably an ancient and conserved trait within streptophytes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AUXIN TRANSPORT