Inhibition of carotenoid synthesis during nitrogen deficiency

Lichtenthaler, H.K.; Verbeek, L.

Planta 112(3): 265-271


ISSN/ISBN: 0032-0935
PMID: 24468735
DOI: 10.2307/23370736
Accession: 000119347

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The ability to synthesize carotenoids during normal or strongly-reduced N supply was tested using barley and the green alga Scenedesmus obliquus. Though carotenoids are N-free, their synthesis was strongly inhibited during N deficiency. The formation of secondary carotenoids, which apparently proceeded at the expense of primary carotenoid components, occurred in the alga but not in barley. It was concluded that the dimerization of geranyl-geranyl-pyrophosphate was the limiting step in carotenoid synthesis during N deficiency; synthesis of prenyl chains was less affected.