Inflorescence morphology of wild-type and bfl1 mutant. A, Mature panicle of wild-type. B, Mature panicle of bfl1 mutant. C, Manually stretched mature panicle of bfl1 mutant. D, Primary rachis-branch (PB) of wild-type at the stage between spikelet primordium and spikelet organ differentiation, which is composed of secondary rachis-branch (SB), lateral spikelets (LS) and terminal spikelet (TS). E, Secondary rachis-branch of wild-type at microspore developmental stage, which is composed of lateral spikelets and terminal spikelet. F, Primary rachis-branch of bfl1 mutant at the developmental stage equivalent to D, alternating higher level rachis-branches are continuously developed instead of spikelets. G, Secondary rachis-branch of bfl1 mutant at the developmental stage equivalent to E. Abbreviations: DP: degenerate point; PB: primary rachis-branch; SB: secondary rachis-branch; LS: lateral spikelet; TS: terminal spikelet; TB: tertiary rachis-branch; BM: branch meristem; RG: rudimentary glume (indicated by triangles).