Journal of Experimental Botany, Vol 49, 1895-1908, Copyright © 1998 by Oxford University Press
G Noctor and C Foyer
The purpose of this review in reanalysing the ATP:reductant balance in
illuminated leaf cells is to stress that the photosynthesis in
vivo does not involve CO2 fixation alone, but embraces other
processes, chief among which is N assimilation. Prior to the demonstration
of CO2 fixation and photophosphorylation by isolated chloroplasts, the
mitochondria were thought likely to provide all the ATP required for CO2
fixation (discussed in Arnon et al., 1954). During the
1960s, the development of techniques for the isolation of chloroplasts able
to fix CO2 at rates approaching those of the parent tissue induced a
paradigm shift, leading to the establishment of a dominant (if not
unanimous) view that chloroplasts in vivo must by
themselves meet all their ATP requirements. More recent studies, however,
indicate that the reality lies somewhere between these two extremes. The
present work places emphasis on the integrated nature of photosynthesis and
proposes that much of the respiratory ATP necessary for whole cell
photosynthesis may be generated during the production of C skeletons for N
assimilation. Rather than considering dissipative electron transport
pathways as necessary to uncouple respiratory precursor synthesis from ATP
production, the present analysis emphasizes the metabolic value of ATP
produced during N-linked respiration, with cellular ATP supply being
tailored to ATP demand.Key words: Photosynthesis,
ATP:NADPH ratio, CO2 fixation, nitrogen assimilation, photorespiration,
respiration.
ARTICLES
Review article. A re-evaluation of the ATP:NADPH budget during C3 photosynthesis: a contribution from nitrate assimilation and its associated respiratory activity?
Department of Biochemistry and Physiology, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK; Corresponding author e-mail: graham.noctor@bbsrc.ac.uk
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