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Fig. 13.10 Proposed MV Chlide
b
biosynthesis via routes 0 in DDV-LDV-LDDV plant species in
reorganization involves release of MV Chl
b
from the light-harvesting Chl
a/b
protein complex of PSII. The released MV Chl
b
is then converted to MV Chl
a
by a Chl
b
formyl reductase. The nascent MV Chl
a
is then used for the formation
of core complexes of PSI and PSII. On the basis of these results we propose that MV
Chl
b
formed via route 8, is convertible to MV Chl
a
in green DDV-LDV-LDDV
plant tissues.
Formation of Chl b from MV Pchlide b via Route 9 in Greening DDV-LDV-LDDV
Plants During the Light Phases of the Photoperiod
In route 9, MV Chl
b
is formed from MV Chlide
b
which is formed in turn from
MV Pchlide
a
and MV Pchlide
b
in green DDV-LDV-LDDV plants (Fig.
13.12
).
The conversion of MV Pchlide
b
to MV Chlide
b
is suggested by the detection of
MV Pchlide
b
(Ioannides et al.
1997
; Kolossov and Rebeiz
2003
) and MV Chlide
b
(Duggan and Rebeiz
1982
) in green(ing) cucumber cotyledons. A specific
precursor-product relationship remains to be established however between MV
Pchlide
b
and MV Chlide
b
in DDV-LDV-LDDV plant tissues. As in the case
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