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Variations of isoprenoid gene expression, PcISPS, leaf DMADP, and carotenoid contents during the growing season 2004. A, Transcript levels of PcDXR and PcISPS; B, transcript level of PcPSY; C, PcISPS protein amount and enzyme activity; D, DMADP and carotenoid contents in poplar leaves (n = 3 ± se). Daily means of air temperature and light-period means of PPFD are depicted in A and B, respectively (bold gray lines).
