Universität zu Köln

Wang, Yu, Braeutigam, Andrea, Weber, Andreas P. M. and Zhu, Xin-Guang (2014). Three distinct biochemical subtypes of C-4 photosynthesis? A modelling analysis. J. Exp. Bot., 65 (13). S. 3567 - 3579. OXFORD: OXFORD UNIV PRESS. ISSN 1460-2431

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Abstract

C-4 photosynthesis has higher light-use, nitrogen-use, and water-use efficiencies than C-3 photosynthesis. Historically, most of C-4 plants were classified into three subtypes (NADP-malic enzyme (ME), NAD-ME, or phosphoenolpyruvate carboxykinase (PEPCK) subtypes) according to their major decarboxylation enzyme. However, a wealth of historic and recent data indicates that flexibility exists between different decarboxylation pathways in many C-4 species, and this flexibility might be controlled by developmental and environmental cues. This work used systems modelling to theoretically explore the significance of flexibility in decarboxylation mechanisms and transfer acids utilization. The results indicate that employing mixed C-4 pathways, either the NADP-ME type with the PEPCK type or the NAD-ME type with the PEPCK type, effectively decreases the need to maintain high concentrations and concentration gradients of transport metabolites. Further, maintaining a mixture of C-4 pathways robustly affords high photosynthetic efficiency under a broad range of light regimes. A pure PEPCK-type C-4 photosynthesis is not beneficial because the energy requirements in bundle sheath cells cannot be fulfilled due to them being shaded by mesophyll cells. Therefore, only two C-4 subtypes should be considered as distinct subtypes, the NADP-ME type and NAD-ME types, which both inherently involve a supplementary PEPCK cycle.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Yu UNSPECIFIED UNSPECIFIED UNSPECIFIED Braeutigam, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Weber, Andreas P. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhu, Xin-Guang UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-435310
DOI:	10.1093/jxb/eru058
Journal or Publication Title:	J. Exp. Bot.
Volume:	65
Number:	13
Page Range:	S. 3567 - 3579
Date:	2014
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1460-2431
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CARBON-ISOTOPE DISCRIMINATION; BUNDLE SHEATH-CELLS; PHOSPHOENOLPYRUVATE CARBOXYKINASE; ZEA-MAYS; ACID DECARBOXYLATION; SPINACH LEAVES; ASPARTATE; LIGHT; ASSIMILATION; EFFICIENCY Multiple languages Plant Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43531