Feeding with aminolevulinic acid increased chlorophyll content in Norway spruce (Picea abies) in the dark

In contrast to angiosperms, which accumulate protochlorophyllide after application of aminolevulinic acid in the dark, feeding with aminolevulinic acid (0.01-20 mM) via the roots in the 18-d-old seedlings of Norway spruce (Picea abies) stimulated not only protochlorophyllide but also chlorophyll accumulation.