Fig. 3. SEM analysis of fzp-2 and fzp-3 ectopic branches. (A,C) fzp-2. (B,D,E) fzp-3. (A) Tertiary branch of fzp-2. Note that the direction of outgrowth of bract-like structures is at 90° to the previous branch. (B) Tertiary branches on a secondary branch of fzp-3. (C) The apex of a fzp-2 tertiary branch terminates with the formation of quaternary branches. (D,E) The majority of fzp-3 tertiary branches form defective spikelets at their tips. 2°, bract-like structure of secondary order branches; 3°, tertiary order; 4°, quaternary order. Scale bars: 100 µm.