Proposed model for PDR1 routes of strigolactone (SL) transport in roots and shoots of Petunia hybrida. Model depicting the effects of PDR1 overexpression on SL transport in roots and shoots. PDR1 OE enhances SL exudation from the root to the rhizosphere, thus possibly reducing shoot‐ward SL transport to the stem and dampening SL concentrations in roots and leaves. As a consequence, lateral root inhibition is released, root hair elongation is induced, and mycorrhization and germination of parasitic weed seeds are enhanced. In the shoot, PDR1 drives the reallocation of SL from the leaves to the stem. This SL route is enhanced in PDR1 OE plants, thus promoting larger leaves, longer internodes than the wild‐type, and possibly playing a role in the inhibition of lateral bud outgrowth.