Fig. 7. rgo1; ids1 double mutant phenotypes. (A) Double mutant plants have reversed and fused kernels (*) and SPMs that elaborate long branches (arrowhead) with spikelets (s) in a distichous pattern. (B) Individual spikelets develop multiple glumes (g) as well as multiple florets in the axils of paleas (p). (C) A SM (sm) that has elongated and reverted into a SPM, initiating another glume. These SMs can be identified by their subtending glumes (g in C,D). The spikelets that they produce, sometimes in pairs (arrowhead, D) are also surrounded by glumes. (E) A SM that has elongated and produced several spikelets. (F) Severe double mutants exhibit increased SPM and SM branching, producing a highly branched ear with no kernels and very few silks. (G) A close examination of a spikelet pair axis (sp) at the base of this ear shows at least six spikelets (s) in a distichous pattern. Each of these spikelets has initiated multiple glumes (arrowheads). Bars, in B and C 100 µm.