The Chl a Carboxylic Biosynthetic Routes: Reactions Between Mg-Protoporphyrin IX and Protochlorophyllide a - Chlorophyll Biosynthesis and Technological Applications - page 198

Fig. 7.3 Biosynthetic routes 1, 0 and 8 which are responsible for the formation of DV Mg-Proto
from DV Proto in LDV-DDV-LDDV plant species. Routes 1, 0 and 8 re highlighted in light grey
(Adapted from Fig. 6.3 of Chap. 6 , and from Kolossov and Rebeiz 2010 )
words, it is unclear whether the proposed biosynthesis of DV Mg-Proto from DV
Proto via routes 10, 11, 0 0 and 12 is catalyzed by identical Mg-Proto chelatases or by
different Mg-Proto chelatase isozymes. These biosynthetic routes will be discussed
further later on.
Metabolism of DV Mg-Proto in DDV-LDV-LDDV Plant Species
The specific role of DVMg-Proto as a precursor of DV Pchlide a in DDV-LDV-LDV
plant species was demonstrated by conversion of exogenous DV Mg-Proto to DV
Pchlide a in isolated etiochloroplasts of cucumber, a DDV-LDV-LDDV plant
species. In cucumber etiochloroplasts the MV and DV proportions of synthesized
Pchlide amounted to 89 % DV Pchlide a and 11 % MV Pchlide a (Tripathy and
Rebeiz 1986 ).