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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.
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Pavlovič et al. (2009) studied this question.
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