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Plant Cell Environ. 2013 Sep;36(9):1711-27. doi: 10.1111/pce.12025. Epub 2012 Nov 19.

e-Photosynthesis: a comprehensive dynamic mechanistic model of C3 photosynthesis: from light capture to sucrose synthesis.

Author information

1
State Key Laboratory of Hybrid Rice, Shanghai Institutes for Biological Sciences, CAS, Shanghai 200031, China. zhuxinguang@picb.ac.cn

Abstract

Photosynthesis is arguably the most researched of all plant processes. A dynamic model of leaf photosynthesis that includes each discrete process from light capture to carbohydrate synthesis, e-photosynthesis, is described. It was developed by linking and extending our previous models of photosystem II (PSII) energy transfer and photosynthetic C3 carbon metabolism to include electron transfer processes around photosystem I (PSI), ion transfer between the lumen and stroma, ATP synthesis and NADP reduction to provide a complete representation. Different regulatory processes linking the light and dark reactions are also included: Rubisco activation via Rubisco activase, pH and xanthophyll cycle-dependent non-photochemical quenching mechanisms, as well as the regulation of enzyme activities via the ferredoxin-theoredoxin system. Although many further feedback and feedforward controls undoubtedly exist, it is shown that e-photosynthesis effectively mimics the typical kinetics of leaf CO₂ uptake, O₂ evolution, chlorophyll fluorescence emission, lumen and stromal pH, and membrane potential following perturbations in light, [CO₂] and [O₂] observed in intact C3 leaves. The model provides a framework for guiding engineering of improved photosynthetic efficiency, for evaluating multiple non-invasive measures used in emerging phenomics facilities, and for quantitative assessment of strengths and weaknesses within the understanding of photosynthesis as an integrated process.

KEYWORDS:

ATPase; Rubisco; Rubisco activase; chlorophyll fluorescence quenching; cytochrome b6f; phenomics; photoprotection; photorespiration; systems biology; thioredoxin

PMID:
23072293
DOI:
10.1111/pce.12025
[Indexed for MEDLINE]
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