A domestication-selected enhancer coordinates source-sink balance to improve harvest index and yield in maize.

Crop yield is fundamentally determined by the harvest index, the proportion of photosynthates allocated to grain.

Crop yield is fundamentally determined by the harvest index, the proportion of photosynthates allocated to grain. However, its genetic and evolutionary basis remains elusive. Here, we show that the maize harvest index increased by 81% during domestication. A major locus, Harvest…