Summary
The ability to synthesize carotenoids during normal or strongly reduced nitrogen supply was tested in a higher plant (Hordeum vulgare L.) and in a green alga (Scenedesmus obliquus). Though carotenoids are nitrogenfree, their synthesis is strongly inhibited during nitrogen deficiency. The formation of secondary carotenoids, which apparently proceeds at the expense of the primary carotenoid components, occurs in Scenedesmus but not in Hordeum plants. It is concluded that the dimerisation of geranly-geranyl-pyrophosphate is the limiting step in the carotenoid synthesis during nitrogen deficiency. The synthesis of prenyl chains is less affected by nitrogen deficiency.
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Lichtenthaler, H.K., Verbeek, L. Die Hemmung der Carotinoidsynthese im Stickstoffmangel. Planta 112, 265–271 (1973). https://doi.org/10.1007/BF00385330
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DOI: https://doi.org/10.1007/BF00385330