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Under CO2-limited conditions such as during stomatal closure, photorespiration is suggested to act as a sink for excess light energy and protect photosystem I (PSI) by oxidizing its reaction center chlorophyll P700. In this study, this issue was directly examined with rice (Oryza sativa L.) plants via genetic manipulation of the amount of Rubisco, which can be a limiting factor for photorespiration...
Metabolome analyses have indicated an accumulation of sedoheptulose 7-phosphate in transgenic rice plants with overproduction of Rubisco (Suzuki et al. in Plant Cell Environ 35:1369–1379, 2012. doi: 10.1111/j.1365-3040.2012.02494.x ). Since Rubisco overproduction did not quantitatively enhance photosynthesis even under CO2-limited conditions, it is suspected that such an accumulation of sedoheptulose...
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