Is the Kok effect a respiratory phenomenon? Metabolic insight using 13C labeling in Helianthus annuus leaves

What is it about?

The Kok effect has first been assumed to be linked to respiratory metabolism but this has never been demonstrated directly. Here, we use isotopic tracing ad show that respiratory CO2 production does participate in the Kok effect but cannot explain the typical break in the photosynthetic response curve.

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