Which outcome limits photosynthetic rate when high oxygen concentrations outcompete carboxylation?

💡 Explanation

When high O2 outcompetes CO2 binding at rubisco's active site via photorespiration, photorespiration reduces RuBP available for the Calvin cycle, limiting the regeneration of RuBP because of energy spent recovering carbon. Therefore, decreased RuBP regeneration results, rather than stimulated synthase, inhibited NADPH in thylakoids, or electron pathway issues which directly affect photophosphorylation but not post-carbon fixation regeneration rates.

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