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CC BY V4.0, Open Access
Journal article
The Coordination of C4 Photosynthesis and the CO2-Concentrating Mechanism in Maize and Miscanthus × giganteus in Response to Transient Changes in Light Quality
Plant physiology (Bethesda), Vol.164(3), pp.1283-1292
03/2014
Handle:
https://hdl.handle.net/2376/113009
PMID: 24488966
Abstract
Unequal absorption of photons between photosystems I and II, and between bundle-sheath and mesophyll cells, are likely to affect the efficiency of the CO2-concentrating mechanism in C-4 plants. Under steady-state conditions, it is expected that the biochemical distribution of energy (ATP and NADPH) and photosynthetic metabolite concentrations will adjust to maintain the efficiency of C-4 photosynthesis through the coordination of the C-3 (Calvin-Benson-Bassham) and C-4 (CO2 pump) cycles. However, under transient conditions, changes in light quality will likely alter the coordination of the C-3 and C-4 cycles, influencing rates of CO2 assimilation and decreasing the efficiency of the CO2-concentrating mechanism. To test these hypotheses, we measured leaf gas exchange, leaf discrimination, chlorophyll fluorescence, electrochromatic shift, photosynthetic metabolite pools, and chloroplast movement in maize (Zea mays) and Miscanthus x giganteus following transitional changes in light quality. In both species, the rate of net CO2 assimilation responded quickly to changes in light treatments, with lower rates of net CO2 assimilation under blue light compared with red, green, and blue light, red light, and green light. Under steady state, the efficiency of CO2-concentrating mechanisms was similar; however, transient changes affected the coordination of C-3 and C-4 cycles in M. giganteus but to a lesser extent in maize. The species differences in the ability to coordinate the activities of C-3 and C-4 cycles appear to be related to differences in the response of cyclic electron flux around photosystem I and potentially chloroplast rearrangement in response to changes in light quality.
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Details
- Title
- The Coordination of C4 Photosynthesis and the CO2-Concentrating Mechanism in Maize and Miscanthus × giganteus in Response to Transient Changes in Light Quality
- Creators
- Wei Sun - Institute of Grassland Science, Northeast Normal University, Key Laboratory of Vegetation Ecology, Ministry of Education, Changchun, Jilin 130024, China (W.S.)Nerea UbiernaJian-Ying MaBerkley J WalkerDavid M KramerAsaph B Cousins
- Publication Details
- Plant physiology (Bethesda), Vol.164(3), pp.1283-1292
- Academic Unit
- School of Biological Sciences
- Publisher
- Amer Soc Plant Biologists
- Number of pages
- 10
- Grant note
- DE-FG02-09ER16062; DE-FG02-04ER15559 / Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, Photosynthetic Systems, Department of Energy; United States Department of Energy (DOE) 0923562 / National Science Foundation; National Science Foundation (NSF) 31270445 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC)
- Identifiers
- 99900547618901842
- Language
- English
- Resource Type
- Journal article