The Chl b Biosynthetic Pathway:Intermediary Metabolism - Chlorophyll Biosynthesis and Technological Applications - page 297

Fig. 13.13 Biosynthesis of MV Chl b via route 10 in greening DMV-LDV-LDMV plants during
the light phases of the photoperiod (Adapted from Fig. 6.4 of Chap. 6 )
Biosynthesis of MV Chl b from MV Pchlide b via Route 11 in Greening
DMV-LDV-LDMV Plants During the Light Phases of the Photoperiod
In route 11, MV Chl b is formed from MV Chlide b which in turns is formed from
MV Pchlide a and MV Pchlide b in green DMV-LDV-LDMV plants. The conver-
sion of MV Pchlide b to MV Chlide b is suggested by the detection of MV Pchlide
b in barley, a DMV-LDV-LDMV plant (Kolossov and Rebeiz 2003 ), and the lack of
precursor product relationship between MV Chlide a and MV Chlide b in greening
corn seedlings during lengthy (15 h) illuminations (Ioannides 1993 ). This observa-
tion argues against the formation of MV Chl b from MV Chlide a and MV Chlide
b during lengthy light phases of the photoperiod. A specific precursor-product
relationship remains to be established however between MV Pchlide b and MV
Chlide b and MV Chl b in green DMV-LDV-LDMV plant tissues. As in the case of