In summary, our studies shed new light on SL transport routes and targets. These could provide a solution for improving plant nutrition and be a strategy for sustainable agriculture on low‐Pi soils, where an increase in the root system volume and/or the symbiosis with mycorrhizal fungi is required to allow the plant to exploit larger soil volumes. Furthermore, screening for accessions with high PDR1 expression could be a new approach to isolate plant varieties with higher mycorrhization efficiency and improved root system architecture.