Fig. 2. Morphology of wild-type, severe and weak fzp inflorescences, spikelets and ectopic branches. (A-D) Wild type. (E-H) fzp-2. (I-L) fzp-3. The wild-type inflorescence (A) is composed of primary branches (B) and secondary branches that have terminal (C) and lateral (D) spikelets. Bracts are not observed at the junction between the spikelet pedicel and the growth axis (D arrow). (E,F) Spikelets are replaced by branches in the severe fzp-2 allele, but defective and normal spikelets can be formed at the apices of ectopic branches of the weak fzp-3 allele (I,J). fzp-2 and fzp-3 secondary branches are composed of alternate bract-like structures (F,J, insets). Tertiary branches develop at the axils of the bract-like structures (G,H,L arrowheads) in the apical part of a secondary branch and they are also composed of bract-like structures that form higher order branches at their axils (G inset). (G) The apices of a fzp-2 secondary branch is terminated with a tertiary branch. (K,L) fzp-3 tertiary branches are terminated with a spikelet. org, outer rudimentary glume; irg, inner rudimentary glume; oeg, outer empty glume; ieg, inner empty glume; l, lemma; p, palea. Scale bars: 1 cm (A,B,E,F,I,J); 1 mm (C,D,G,H,K,L).

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