Fig. 3. Wild-type and rgo1 ear development. These images are a series from the tip to the base of developing ears. (A,C,E,G,I) Wild type and (B,D,F,H,J) rgo1. (A,B) Inflorescence meristems (im) producing multiple files of spikelet pair meristems (spm). The spikelet pair meristems produce a spikelet meristem (sm), which initiates the outer glume (og) and then the inner glume (not shown) in wild type (C) and rgo1 (D). In wild-type development, the spikelet meristem initiates one floret meristem (fm) (E), whereas in rgo1 mutants each spikelet meristem produces two floret meristems (F). The spikelet meristem then converts into a floret meristem, and initiates floral organs, including three anthers (a) and the pistil primordial (p). In wild-type spikelets the anthers are arranged with the middle anther facing the tip of the ear (G), whereas the anthers face the base of the ear in rgo1 (H). Finally, each floral meristem produces the gynoecial ridge (gr), which is in the reversed orientationin rgo1 (J) relative to wild-type (I). The second floret (arrowheads, J) often develops in rgo1 spikelets. Bars, 200 µm (A,B), 100 µm (C-J).

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