Barbara Ann Halkier

1 INTRODUCTION The green transition demands a shift in the global diet from consumption of animal-based protein to plant-based protein.1 This shift requires multiple sources of plant-based proteins, of which rapeseed is an existing, yet underutilized protein source. Today, rapeseed is grown as an oil crop and the rapeseed press cake that remains after the oil is pressed out of the seeds, is a low-value sidestream despite its content of 30–40% protein with good amino acid composition.

Abstract Many plant species translocate maternally synthesized specialized metabolites to the seed to protect the developing embryo and later the germinating seedling before it initiates its own de novo synthesis. While the transport route into the seed is well established for primary metabolites, no model exists for any class of specialized metabolites that move from maternal source tissue(s) to embryo.