C4 Photosynthesis: Quantum Requirement, C4 and Overcycling and Q-Cycle Involvement

Robert T  Furbank; Colin Jenkins; M D Hatch

doi:10.1071/PP9900001

C4 Photosynthesis: Quantum Requirement, C4 and Overcycling and Q-Cycle Involvement

Robert T Furbank, Colin Jenkins, M D Hatch

Research output: Contribution to journal › Article › peer-review

Abstract

The relationship between overcycling of the C4 acid cycle in C4 photosynthesis (due to CO2 leakage) and the quantum yield of photosynthesis is considered. From a comparison of theoretical and measured quantum yields we suggest that the high efficiency of light utilisation by most C4 plants can only be explained by the mandatory involvement of both the Q-cycle and cyclic or pseudocyclic electron transport in the proton partitioning process. The existence of the Q-cycle mechanism may have been a prerequisite for the evolution of the C4 pathway.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	Australian Journal of Plant Physiology
Volume	17
Issue number	1
DOIs	https://doi.org/10.1071/PP9900001
Publication status	Published - 1990
Externally published	Yes

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title = "C4 Photosynthesis: Quantum Requirement, C4 and Overcycling and Q-Cycle Involvement",

abstract = "The relationship between overcycling of the C4 acid cycle in C4 photosynthesis (due to CO2 leakage) and the quantum yield of photosynthesis is considered. From a comparison of theoretical and measured quantum yields we suggest that the high efficiency of light utilisation by most C4 plants can only be explained by the mandatory involvement of both the Q-cycle and cyclic or pseudocyclic electron transport in the proton partitioning process. The existence of the Q-cycle mechanism may have been a prerequisite for the evolution of the C4 pathway.",

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AB - The relationship between overcycling of the C4 acid cycle in C4 photosynthesis (due to CO2 leakage) and the quantum yield of photosynthesis is considered. From a comparison of theoretical and measured quantum yields we suggest that the high efficiency of light utilisation by most C4 plants can only be explained by the mandatory involvement of both the Q-cycle and cyclic or pseudocyclic electron transport in the proton partitioning process. The existence of the Q-cycle mechanism may have been a prerequisite for the evolution of the C4 pathway.

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DO - 10.1071/PP9900001

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JO - Australian Journal of Plant Physiology

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SN - 0310-7841

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C4 Photosynthesis: Quantum Requirement, C4 and Overcycling and Q-Cycle Involvement

Abstract

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