Fig. 3.
Proportion (indicated by colour scale at top right) of nodes at specific main stem and side branch positions having a harvestable boll, measured experimentally in cotton plants at three plant densities: 1.5 (left panel), 7.5 (middle panel) and 13.5 plants m−2 (right panel). The number on the y-axis indicates the phytomer along the main stem and the number on the x-axis indicates the phytomer along the branch at the corresponding rank of the main stem. Red dashed lines connect phytomers belonging to the same cohort (age class). For nodes of the same age, the probability of boll survival increases with decreasing distance of the fruit from the main stem and increasing main stem rank, suggesting the importance of access to locally produced carbohydrates.