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Fig. 16.2 The single
branched Chl biosynthetic
pathwayProposedby
(Granick
1950
) and modified
by (Wolff and Price
1957
)
and (Jones
1963
)
(Rebeiz et al.
1994
). All in all, experimental evidence gathered over the past
33 years indicates that only a small fraction of the total Chl of green plants is
formed via this pathway (Rebeiz et al.
1994
,
2003a
).
16.5.1.2 The Chl of Green Plants Is Formed via a Multibranched
Biosynthetic Pathway
Our understanding of the Chl biosynthetic pathway has changed dramatically
since the 1963 seminal review of Smith and French (
1963
). Several factors have
contributed to this phenomenon, among which: (a) development of systems capable
of Chl and thylakoid membrane biosynthesis in organello and in vitro, (Daniell and
Rebeiz
1982a
,
b
; Kolossov et al.
1999
; Rebeiz and Castelfranco
1971a
,
b
; Rebeiz
et al.
1984
), (b) powerful analytical techniques that allowed the qualitative and
quantitative determination of various intermediates of the pathway (Rebeiz
2002
),
(c) recognition that the greening process proceeds differently in etiolated and green
tissues, in darkness and in the light, (Carey and Rebeiz
1985
), and in plants
belonging to different greening groups (Abd-El-Mageed et al.
1997
; Ioannides
et al.
1994
), and (d) recognition of the probability that the structural and functional
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