Average Grain Weight
Average grain weight (AGW) was measured by first weighing the seeds (~60mg). Next, these seeds were spread over a white sheet and photographed. For each plot the image was threshold using ‘coveragetool’ (by sampling seeds to account, Fig S6). Then, the threshold images were analyzed using Image J’s ‘particle count’ option. Finally, AGW was calculated as the seed weight divided by number of seed for each plot.