(a) Floral plasticity of eg1 alleles in two exchanged backgrounds. eg1-1 (ZF802>ZH11) and eg1-2 (ZH11>ZF802) show eg1-1 and eg1-2 backcrossed into ZH11 or ZF802 backgrounds, respectively. (b) Floral plasticity of eg1-4 in indica Dular background. Statistical analysis of two types of panicles according to rs (Type I and Type II) are shown. (c) Floral plasticity of eg1-5 and -6 in japonica Nipponbare background. Statistical analysis of the two independent lines are shown. LS Feb, Lingshui Feb. LS Apr, Lingshui Apr. Beijing, Beijing summer. Lingshui, Lingshui winter. Variable phenotypes of spikelets are defined as in S1 Table, and percentages of them in a panicle are shown in the y axis. le, lemma; pa, palea; st, stamen; eg, empty glume; if, inflorescence primordia; sp, smaller pa; lel, lemma-like organ; pl, palea-lemma mosaic organ. Bars = 2 mm. Values are means ± SE, number of analyzed panicles ≥ 5, and significant difference was determined by ANOVA, *P < 0.05, **P < 0.01.