Acclimation of C4 metabolism to low light in mature maize leaves could limit energetic losses during progressive shading in a crop canopy.

, 2008 ) relies on assumptions that should be reconsidered in view of recent discoveries: the CCM is not uniquely supplied by the ATP-costly PEPC activity, but, under certain conditions, the contribution through respiration and photorespiration may be significant ( Kromdijk et al. , 2010 ; Sage et al. , 2012 ; Bellasio and Griffiths, 2013 ).

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