Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 67, Issue 10, Pages 2923-2929Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erw083
Keywords
Calvin-Benson cycle; gas exchange; glycine decarboxylase; metabolic regulation; mutant; photorespiration; photosynthesis
Categories
Funding
- German Research Foundation [FOR 1186]
Ask authors/readers for more resources
Regulatory feedback from photorespiration to the Calvin-Benson cycle controls CO2 fixation and photorespiration.The Calvin-Benson cycle and the photorespiratory pathway form the photosynthetic-photorespiratory supercycle that is responsible for nearly all biological CO2 fixation on Earth. In essence, supplementation with the photorespiratory pathway is necessary because the CO2-fixing enzyme of the Calvin-Benson cycle, ribulose 1,5-bisphosphate carboxylase (Rubisco), catalyses several side reactions including the oxygenation of ribulose 1,5-bisphosphate, which produces the noxious metabolite phosphoglycolate. The photorespiratory pathway recycles the phosphoglycolate to 3-phosphoglycerate and in this way allows the Calvin-Benson cycle to operate in the presence of molecular oxygen generated by oxygenic photosynthesis. While the carbon flow through the individual and combined subprocesses is well known, information on their regulatory interaction is very limited. Regulatory feedback from the photorespiratory pathway to the Calvin-Benson cycle can be presumed from numerous inhibitor experiments and was demonstrated in recent studies with transgenic plants. This complexity illustrates that we are not yet ready to rationally engineer photosynthesis by altering photorespiration since despite massive understanding of the core photorespiratory pathway our understanding of its interaction with other pathways and processes remains fragmentary.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available