To further investigate how PDR1 OE shoot phenotypes are related to SL reallocation, we assayed DAD1 and MAX1 expression to obtain an indirect and distinct quantification of SL in wild‐type and PDR1 OE 2‐month‐old (adult) plants. DAD1 and MAX1 were up‐regulated (Fig. 4j) in leaves of PDR1 OE plants, confirming the results obtained in 1‐month‐old PDR1 OE plantlet shoots. By contrast, MAX1 and DAD1 were strongly down‐regulated in PDR1 OE stems (Fig. 4j). This result suggests that SL accumulation in the stem (probably close to the nodes, as inferred from the SL‐related bud phenotype of PDR1 OE plants) might be a result not only of SL reallocation in the stem but also of SL depletion out of the leaves driven by PDR1. To test for the presence of this possible SL transport route from the leaf to the stem, we quantified SL from stem and leaf extracts with the P. ramosa germination assay in wild‐type, PDR1 OE and pdr1 ko leaves.