The Chl a Carboxylic Biosynthetic Routes: Conversion of Chlide a to Chl a - Chlorophyll Biosynthesis and Technological Applications - page 254

Fig. 10.2 MV Chl a biosynthesis via routes 2, 3, 7, 0, and 8 in DDV-LDV-LDDV plant species
(Adapted from Fig. 6.3 of Chap. 6 )

10.1.3 Biosynthetic Heterogeneity of MV Chlorophyll
a in DDV-LDV-LDDV Plants via
Routes 2, 3, 5, 7, 0, and 8

In DDV-LDV-LDDV plant species, MV Chl a can be formed via five different
biosynthetic routes which are discussed below (Fig. 10.2 ).

10.1.3.1 Biosynthesis of MV Chlorophyll in DDV-LDV-LDDV

Plants via a Combination of routes 1 and 2 in Greening
DDV-LDV-LDDV Plants During the Initial Phases
of the Photoperiod

a

In DDV-LDV-LDDV plants growing under photoperiodic conditions, at the onset of
illumination, during the first few dark cycles of the photoperiod when t-LW-Pchlide a
accumulation is noticeable (Cohen et al. 1977 ; Cohen and Rebeiz 1978 ), upon
exposure to light, MV Pchlide a is photoconverted to MV Chlide a by PORA. Most
probably, conversion of the nascent MV Chlide a to MV Chl a via route 2 takes place
via Chl a-GG followed by stepwise hydrogenation to Chl a -Phytol as described later.