Fig. 4. rgo1 tassel defects are similar to ear defects. (A) Wild-type tassel spikelet meristems (sm) initiate one floret meristem (fm) while (B) rgo1 spikelet meristems initiate two. Earlier events (not shown) and later events including floral organ initiation (C, wild type; D, rgo1) are unaffected. a, anther primordia; p, pistil primordia; l, lodicule. Bars, 100 µm (A), 200 µm (B), 50 µm (C,D).