Figure 1.

Experimental design. Shown is a diagram of a single clone. An oval represents a pair of inflorescences located close-by near the tips of a branch. One inflorescence was pollinated with pollen from that same inflorescence pair (=autogamy treatment), whereas the other inflorescence was pollinated with pollen from one of the inflorescences located on the opposite side of the clone (=geitonogamy treatment). This set of autogamous and geitonogamous pollination treatments was replicated 20 times within each clone. Also shown are the positions where U_c ‘crown mutations' are assumed to occur with respect to the position of the last common meristematic cell shared by the cell lineages that produced the flowers used in the geitonogamy treatment.