Cocoa orthologues of markers of plant carbon starvation are up-regulated following a spatial pattern in mature brooms. Fold increase of marker genes assayed at three different positions (shading) within mature brooms, showing either a gradual increase towards the top (early responsive genes TcATG8, TcAMY1, and TcDIN10), or specific up-regulation at the top leaves (late responsive gene TcDIN10). Data points represent the mean value of three biological replicates with calculated standard deviations. (This figure is available in colour at JXB online.)