Revertants of bfl1 mutant. A, Heading panicle with revertant spikelets. B, Mature panicle with revertant seeds. C, Panicles of PR2 showing normal developed spikelets. D, Panicles of PR3 showing bfl1 mutant phenotype. E, Normal looking revertant seed. F, Abnormal sterile revertant seed. G, Sterile revertant spikelet with an extra sterile spikelet inside. H, Sterile revertant spikelet with just lemma.