Fig. 5

Content of 5-aminolevulinic acid (5-ALA), porphobilinogen (PBG), uroporphyrinogen III, Chlorophyll a and b (Chla and Chlb) under different light intensities in HrHEMA, HrPOR and HrCAO transgenic tobacco leaves. a to f show the contents of 5-ALA, PBG, uroporphyrinogen III, Chla and Chlb, respectively. * represents p < 0.05, ** represents p < 0.01; # represents p < 0.05, comparison between 6000 (or 10,000) and 2000 lx of the same gene; & represents p < 0.05, comparison between 10,000 and 6000 lx of the same gene